Updated setup.py

Remove database name necessity in uri connection schema

.gitignore

@@ -1,4 +1,17 @@
-*.pyc
+.*
-.*.swp
+!.gitignore
+*~
+*.py[co]
+.*.sw[po]
+*.egg
 docs/.build
 docs/_build
+build/
+dist/
+mongoengine.egg-info/
+env/
+.settings
+.project
+.pydevproject
+tests/test_bugfix.py
+htmlcov/

.travis.yml

@@ -0,0 +1,29 @@
+# http://travis-ci.org/#!/MongoEngine/mongoengine
+language: python
+services: mongodb
+python:
+    - "2.6"
+    - "2.7"
+    - "3.2"
+    - "3.3"
+env:
+  - PYMONGO=dev DJANGO=1.5.1
+  - PYMONGO=dev DJANGO=1.4.2
+  - PYMONGO=2.5 DJANGO=1.5.1
+  - PYMONGO=2.5 DJANGO=1.4.2
+  - PYMONGO=3.2 DJANGO=1.5.1
+  - PYMONGO=3.3 DJANGO=1.5.1
+install:
+    - if [[ $TRAVIS_PYTHON_VERSION == '2.'* ]]; then cp /usr/lib/*/libz.so $VIRTUAL_ENV/lib/; fi
+    - if [[ $TRAVIS_PYTHON_VERSION == '2.'* ]]; then pip install pil --use-mirrors ; true; fi
+    - if [[ $PYMONGO == 'dev' ]]; then pip install https://github.com/mongodb/mongo-python-driver/tarball/master; true; fi
+    - if [[ $PYMONGO != 'dev' ]]; then pip install pymongo==$PYMONGO --use-mirrors; true; fi
+    - pip install https://pypi.python.org/packages/source/p/python-dateutil/python-dateutil-2.1.tar.gz#md5=1534bb15cf311f07afaa3aacba1c028b
+    - python setup.py install
+script:
+    - python setup.py test
+notifications:
+  irc: "irc.freenode.org#mongoengine"
+branches:
+  only:
+    - master

AUTHORS

@@ -0,0 +1,181 @@
+The PRIMARY AUTHORS are (and/or have been):
+
+Ross Lawley <ross.lawley@gmail.com>
+Harry Marr <harry@hmarr.com>
+Matt Dennewitz <mattdennewitz@gmail.com>
+Deepak Thukral <iapain@yahoo.com>
+Florian Schlachter <flori@n-schlachter.de>
+Steve Challis <steve@stevechallis.com>
+Wilson Júnior <wilsonpjunior@gmail.com>
+Dan Crosta https://github.com/dcrosta
+Laine Herron https://github.com/LaineHerron
+
+CONTRIBUTORS
+
+Dervived from the git logs, inevitably incomplete but all of whom and others
+have submitted patches, reported bugs and generally helped make MongoEngine
+that much better:
+
+ * blackbrrr
+ * Florian Schlachter
+ * Vincent Driessen
+ * Steve Challis
+ * flosch
+ * Deepak Thukral
+ * Colin Howe
+ * Wilson Júnior (https://github.com/wpjunior)
+ * Alistair Roche
+ * Dan Crosta
+ * Viktor Kerkez
+ * Stephan Jaekel
+ * Rached Ben Mustapha
+ * Greg Turner
+ * Daniel Hasselrot
+ * Mircea Pasoi
+ * Matt Chisholm
+ * James Punteney
+ * TimothéePeignier
+ * Stuart Rackham
+ * Serge Matveenko
+ * Matt Dennewitz
+ * Don Spaulding
+ * Ales Zoulek
+ * sshwsfc
+ * sib
+ * Samuel Clay
+ * Nick Vlku
+ * martin
+ * Flavio Amieiro
+ * Анхбаяр Лхагвадорж
+ * Zak Johnson
+ * Victor Farazdagi
+ * vandersonmota
+ * Theo Julienne
+ * sp
+ * Slavi Pantaleev
+ * Richard Henry
+ * Nicolas Perriault
+ * Nick Vlku Jr
+ * Michael Henson
+ * Leo Honkanen
+ * kuno
+ * Josh Ourisman
+ * Jaime
+ * Igor Ivanov
+ * Gregg Lind
+ * Gareth Lloyd
+ * Albert Choi
+ * John Arnfield
+ * grubberr
+ * Paul Aliagas
+ * Paul Cunnane
+ * Julien Rebetez
+ * Marc Tamlyn
+ * Karim Allah
+ * Adam Parrish
+ * jpfarias
+ * jonrscott
+ * Alice Zoë Bevan-McGregor (https://github.com/amcgregor/)
+ * Stephen Young
+ * tkloc
+ * aid
+ * yamaneko1212
+ * dave mankoff
+ * Alexander G. Morano
+ * jwilder
+ * Joe Shaw
+ * Adam Flynn
+ * Ankhbayar
+ * Jan Schrewe
+ * David Koblas
+ * Crittercism
+ * Alvin Liang
+ * andrewmlevy
+ * Chris Faulkner
+ * Ashwin Purohit
+ * Shalabh Aggarwal
+ * Chris Williams
+ * Robert Kajic
+ * Jacob Peddicord
+ * Nils Hasenbanck
+ * mostlystatic
+ * Greg Banks
+ * swashbuckler
+ * Adam Reeve
+ * Anthony Nemitz
+ * deignacio
+ * Shaun Duncan
+ * Meir Kriheli
+ * Andrey Fedoseev
+ * aparajita
+ * Tristan Escalada
+ * Alexander Koshelev
+ * Jaime Irurzun
+ * Alexandre González
+ * Thomas Steinacher
+ * Tommi Komulainen
+ * Peter Landry
+ * biszkoptwielki
+ * Anton Kolechkin
+ * Sergey Nikitin
+ * psychogenic
+ * Stefan Wójcik
+ * dimonb
+ * Garry Polley
+ * James Slagle
+ * Adrian Scott
+ * Peter Teichman
+ * Jakub Kot
+ * Jorge Bastida
+ * Aleksandr Sorokoumov
+ * Yohan Graterol
+ * bool-dev
+ * Russ Weeks
+ * Paul Swartz
+ * Sundar Raman
+ * Benoit Louy
+ * lraucy
+ * hellysmile
+ * Jaepil Jeong
+ * Daniil Sharou
+ * Stefan Wójcik
+ * Pete Campton
+ * Martyn Smith
+ * Marcelo Anton
+ * Aleksey Porfirov
+ * Nicolas Trippar
+ * Manuel Hermann
+ * Gustavo Gawryszewski
+ * Max Countryman
+ * caitifbrito
+ * lcya86 刘春洋
+ * Martin Alderete (https://github.com/malderete)
+ * Nick Joyce
+ * Jared Forsyth
+ * Kenneth Falck
+ * Lukasz Balcerzak
+ * Nicolas Cortot
+ * Alex (https://github.com/kelsta)
+ * Jin Zhang
+ * Daniel Axtens
+ * Leo-Naeka
+ * Ryan Witt (https://github.com/ryanwitt)
+ * Jiequan (https://github.com/Jiequan)
+ * hensom (https://github.com/hensom)
+ * zhy0216 (https://github.com/zhy0216)
+ * istinspring (https://github.com/istinspring)
+ * Massimo Santini (https://github.com/mapio)
+ * Nigel McNie (https://github.com/nigelmcnie)
+ * ygbourhis (https://github.com/ygbourhis)
+ * Bob Dickinson (https://github.com/BobDickinson)
+ * Michael Bartnett (https://github.com/michaelbartnett)
+ * Alon Horev (https://github.com/alonho)
+ * Kelvin Hammond (https://github.com/kelvinhammond)
+ * Jatin- (https://github.com/jatin-)
+ * Paul Uithol (https://github.com/PaulUithol)
+ * Thom Knowles (https://github.com/fleat)
+ * Paul (https://github.com/squamous)
+ * Olivier Cortès (https://github.com/Karmak23)
+ * crazyzubr (https://github.com/crazyzubr)
+ * FrankSomething (https://github.com/FrankSomething)
+ * Alexandr Morozov (https://github.com/LK4D4)

CONTRIBUTING.rst

@@ -0,0 +1,61 @@
+Contributing to MongoEngine
+===========================
+
+MongoEngine has a large `community
+<https://raw.github.com/MongoEngine/mongoengine/master/AUTHORS>`_ and
+contributions are always encouraged. Contributions can be as simple as
+minor tweaks to the documentation. Please read these guidelines before
+sending a pull request.
+
+Bugfixes and New Features
+-------------------------
+
+Before starting to write code, look for existing `tickets
+<https://github.com/MongoEngine/mongoengine/issues?state=open>`_ or `create one
+<https://github.com/MongoEngine/mongoengine/issues>`_ for your specific
+issue or feature request. That way you avoid working on something
+that might not be of interest or that has already been addressed.  If in doubt
+post to the `user group <http://groups.google.com/group/mongoengine-users>`
+
+Supported Interpreters
+----------------------
+
+MongoEngine supports CPython 2.6 and newer. Language
+features not supported by all interpreters can not be used.
+Please also ensure that your code is properly converted by
+`2to3 <http://docs.python.org/library/2to3.html>`_ for Python 3 support.
+
+Style Guide
+-----------
+
+MongoEngine aims to follow `PEP8 <http://www.python.org/dev/peps/pep-0008/>`_
+including 4 space indents and 79 character line limits.
+
+Testing
+-------
+
+All tests are run on `Travis <http://travis-ci.org/MongoEngine/mongoengine>`_
+and any pull requests are automatically tested by Travis. Any pull requests
+without tests will take longer to be integrated and might be refused.
+
+General Guidelines
+------------------
+
+- Avoid backward breaking changes if at all possible.
+- Write inline documentation for new classes and methods.
+- Write tests and make sure they pass (make sure you have a mongod
+  running on the default port, then execute ``python setup.py test``
+  from the cmd line to run the test suite).
+- Add yourself to AUTHORS :)
+
+Documentation
+-------------
+
+To contribute to the `API documentation
+<http://docs.mongoengine.org/en/latest/apireference.html>`_
+just make your changes to the inline documentation of the appropriate
+`source code <https://github.com/MongoEngine/mongoengine>`_ or `rst file
+<https://github.com/MongoEngine/mongoengine/tree/master/docs>`_ in a
+branch and submit a `pull request <https://help.github.com/articles/using-pull-requests>`_.
+You might also use the github `Edit <https://github.com/blog/844-forking-with-the-edit-button>`_
+button.

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2009-2010 Harry Marr
+Copyright (c) 2009 See AUTHORS
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation

MANIFEST.in

@@ -1,6 +1,6 @@
+include MANIFEST.in
 include README.rst
 include LICENSE
+include AUTHORS
 recursive-include docs *
-prune docs/_build/*
+prune docs/_build
-recursive-include tests *
-recursive-exclude * *.pyc *.swp

README.rst

@@ -2,26 +2,31 @@
 MongoEngine
 ===========
 :Info: MongoEngine is an ORM-like layer on top of PyMongo.
+:Repository: https://github.com/MongoEngine/mongoengine
 :Author: Harry Marr (http://github.com/hmarr)
+:Maintainer: Ross Lawley (http://github.com/rozza)
+
+.. image:: https://secure.travis-ci.org/MongoEngine/mongoengine.png?branch=master
+  :target: http://travis-ci.org/MongoEngine/mongoengine
 
 About
 =====
 MongoEngine is a Python Object-Document Mapper for working with MongoDB.
-Documentation available at http://hmarr.com/mongoengine/ - there is currently 
+Documentation available at http://mongoengine-odm.rtfd.org - there is currently
-a `tutorial <http://hmarr.com/mongoengine/tutorial.html>`_, a `user guide 
+a `tutorial <http://readthedocs.org/docs/mongoengine-odm/en/latest/tutorial.html>`_, a `user guide
-<http://hmarr.com/mongoengine/userguide.html>`_ and an `API reference
+<https://mongoengine-odm.readthedocs.org/en/latest/guide/index.html>`_ and an `API reference
-<http://hmarr.com/mongoengine/apireference.html>`_.
+<http://readthedocs.org/docs/mongoengine-odm/en/latest/apireference.html>`_.
 
 Installation
 ============
 If you have `setuptools <http://peak.telecommunity.com/DevCenter/setuptools>`_
-you can use ``easy_install mongoengine``. Otherwise, you can download the
+you can use ``easy_install -U mongoengine``. Otherwise, you can download the
-source from `GitHub <http://github.com/hmarr/mongoengine>`_ and run ``python
+source from `GitHub <http://github.com/MongoEngine/mongoengine>`_ and run ``python
 setup.py install``.
 
 Dependencies
 ============
-- pymongo 1.1+
+- pymongo 2.5+
 - sphinx (optional - for documentation generation)
 
 Examples
@@ -58,11 +63,6 @@ Some simple examples of what MongoEngine code looks like::
     ...         print 'Link:', post.url
     ...     print
     ...
-    === Using MongoEngine ===
-    See the tutorial
-
-    === MongoEngine Docs ===
-    Link: hmarr.com/mongoengine
 
     >>> len(BlogPost.objects)
     2
@@ -80,10 +80,16 @@ Some simple examples of what MongoEngine code looks like::
 Tests
 =====
 To run the test suite, ensure you are running a local instance of MongoDB on
-the standard port, and run ``python setup.py test``.
+the standard port, and run: ``python setup.py test``.
+
+Community
+=========
+- `MongoEngine Users mailing list
+  <http://groups.google.com/group/mongoengine-users>`_
+- `MongoEngine Developers mailing list
+  <http://groups.google.com/group/mongoengine-dev>`_
+- `#mongoengine IRC channel <http://webchat.freenode.net/?channels=mongoengine>`_
 
 Contributing
 ============
-The source is available on `GitHub <http://github.com/hmarr/mongoengine>`_ - to
+We welcome contributions! see  the`Contribution guidelines <https://github.com/MongoEngine/mongoengine/blob/master/CONTRIBUTING.rst>`_
-contribute to the project, fork it on GitHub and send a pull request, all
-contributions and suggestions are welcome!

benchmark.py

@@ -0,0 +1,282 @@
+#!/usr/bin/env python
+
+import timeit
+
+
+def cprofile_main():
+    from pymongo import Connection
+    connection = Connection()
+    connection.drop_database('timeit_test')
+    connection.disconnect()
+
+    from mongoengine import Document, DictField, connect
+    connect("timeit_test")
+
+    class Noddy(Document):
+        fields = DictField()
+
+    for i in xrange(1):
+        noddy = Noddy()
+        for j in range(20):
+            noddy.fields["key" + str(j)] = "value " + str(j)
+        noddy.save()
+
+
+def main():
+    """
+    0.4 Performance Figures ...
+
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - Pymongo
+    3.86744189262
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine
+    6.23374891281
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, safe=False, validate=False
+    5.33027005196
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, safe=False, validate=False, cascade=False
+    pass - No Cascade
+
+    0.5.X
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - Pymongo
+    3.89597702026
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine
+    21.7735359669
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, safe=False, validate=False
+    19.8670389652
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, safe=False, validate=False, cascade=False
+    pass - No Cascade
+
+    0.6.X
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - Pymongo
+    3.81559205055
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine
+    10.0446798801
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, safe=False, validate=False
+    9.51354718208
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, safe=False, validate=False, cascade=False
+    9.02567505836
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, force=True
+    8.44933390617
+
+    0.7.X
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - Pymongo
+    3.78801012039
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine
+    9.73050498962
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, safe=False, validate=False
+    8.33456707001
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, safe=False, validate=False, cascade=False
+    8.37778115273
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, force=True
+    8.36906409264
+    0.8.X
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - Pymongo
+    3.69964408875
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - Pymongo write_concern={"w": 0}
+    3.5526599884
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine
+    7.00959801674
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries without continual assign - MongoEngine
+    5.60943293571
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine - write_concern={"w": 0}, cascade=True
+    6.715102911
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, write_concern={"w": 0}, validate=False, cascade=True
+    5.50644683838
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, write_concern={"w": 0}, validate=False
+    4.69851183891
+    ----------------------------------------------------------------------------------------------------
+    Creating 10000 dictionaries - MongoEngine, force_insert=True, write_concern={"w": 0}, validate=False
+    4.68946313858
+    ----------------------------------------------------------------------------------------------------
+    """
+
+    setup = """
+from pymongo import MongoClient
+connection = MongoClient()
+connection.drop_database('timeit_test')
+"""
+
+    stmt = """
+from pymongo import MongoClient
+connection = MongoClient()
+
+db = connection.timeit_test
+noddy = db.noddy
+
+for i in xrange(10000):
+    example = {'fields': {}}
+    for j in range(20):
+        example['fields']["key"+str(j)] = "value "+str(j)
+
+    noddy.save(example)
+
+myNoddys = noddy.find()
+[n for n in myNoddys] # iterate
+"""
+
+    print "-" * 100
+    print """Creating 10000 dictionaries - Pymongo"""
+    t = timeit.Timer(stmt=stmt, setup=setup)
+    print t.timeit(1)
+
+    stmt = """
+from pymongo import MongoClient
+connection = MongoClient()
+
+db = connection.timeit_test
+noddy = db.noddy
+
+for i in xrange(10000):
+    example = {'fields': {}}
+    for j in range(20):
+        example['fields']["key"+str(j)] = "value "+str(j)
+
+    noddy.save(example, write_concern={"w": 0})
+
+myNoddys = noddy.find()
+[n for n in myNoddys] # iterate
+"""
+
+    print "-" * 100
+    print """Creating 10000 dictionaries - Pymongo write_concern={"w": 0}"""
+    t = timeit.Timer(stmt=stmt, setup=setup)
+    print t.timeit(1)
+
+    setup = """
+from pymongo import MongoClient
+connection = MongoClient()
+connection.drop_database('timeit_test')
+connection.disconnect()
+
+from mongoengine import Document, DictField, connect
+connect("timeit_test")
+
+class Noddy(Document):
+    fields = DictField()
+"""
+
+    stmt = """
+for i in xrange(10000):
+    noddy = Noddy()
+    for j in range(20):
+        noddy.fields["key"+str(j)] = "value "+str(j)
+    noddy.save()
+
+myNoddys = Noddy.objects()
+[n for n in myNoddys] # iterate
+"""
+
+    print "-" * 100
+    print """Creating 10000 dictionaries - MongoEngine"""
+    t = timeit.Timer(stmt=stmt, setup=setup)
+    print t.timeit(1)
+
+    stmt = """
+for i in xrange(10000):
+    noddy = Noddy()
+    fields = {}
+    for j in range(20):
+        fields["key"+str(j)] = "value "+str(j)
+    noddy.fields = fields
+    noddy.save()
+
+myNoddys = Noddy.objects()
+[n for n in myNoddys] # iterate
+"""
+
+    print "-" * 100
+    print """Creating 10000 dictionaries without continual assign - MongoEngine"""
+    t = timeit.Timer(stmt=stmt, setup=setup)
+    print t.timeit(1)
+
+    stmt = """
+for i in xrange(10000):
+    noddy = Noddy()
+    for j in range(20):
+        noddy.fields["key"+str(j)] = "value "+str(j)
+    noddy.save(write_concern={"w": 0}, cascade=True)
+
+myNoddys = Noddy.objects()
+[n for n in myNoddys] # iterate
+"""
+
+    print "-" * 100
+    print """Creating 10000 dictionaries - MongoEngine - write_concern={"w": 0}, cascade = True"""
+    t = timeit.Timer(stmt=stmt, setup=setup)
+    print t.timeit(1)
+
+    stmt = """
+for i in xrange(10000):
+    noddy = Noddy()
+    for j in range(20):
+        noddy.fields["key"+str(j)] = "value "+str(j)
+    noddy.save(write_concern={"w": 0}, validate=False, cascade=True)
+
+myNoddys = Noddy.objects()
+[n for n in myNoddys] # iterate
+"""
+
+    print "-" * 100
+    print """Creating 10000 dictionaries - MongoEngine, write_concern={"w": 0}, validate=False, cascade=True"""
+    t = timeit.Timer(stmt=stmt, setup=setup)
+    print t.timeit(1)
+
+    stmt = """
+for i in xrange(10000):
+    noddy = Noddy()
+    for j in range(20):
+        noddy.fields["key"+str(j)] = "value "+str(j)
+    noddy.save(validate=False, write_concern={"w": 0})
+
+myNoddys = Noddy.objects()
+[n for n in myNoddys] # iterate
+"""
+
+    print "-" * 100
+    print """Creating 10000 dictionaries - MongoEngine, write_concern={"w": 0}, validate=False"""
+    t = timeit.Timer(stmt=stmt, setup=setup)
+    print t.timeit(1)
+
+    stmt = """
+for i in xrange(10000):
+    noddy = Noddy()
+    for j in range(20):
+        noddy.fields["key"+str(j)] = "value "+str(j)
+    noddy.save(force_insert=True, write_concern={"w": 0}, validate=False)
+
+myNoddys = Noddy.objects()
+[n for n in myNoddys] # iterate
+"""
+
+    print "-" * 100
+    print """Creating 10000 dictionaries - MongoEngine, force_insert=True, write_concern={"w": 0}, validate=False"""
+    t = timeit.Timer(stmt=stmt, setup=setup)
+    print t.timeit(1)
+
+
+if __name__ == "__main__":
+    main()

docs/_themes/nature/static/nature.css_t

@@ -5,6 +5,10 @@
 
 @import url("basic.css");
 
+#changelog p.first {margin-bottom: 0 !important;}
+#changelog p {margin-top: 0 !important;
+              margin-bottom: 0 !important;}
+
 /* -- page layout ----------------------------------------------------------- */
 
 body {

docs/apireference.rst

@@ -6,6 +6,7 @@ Connecting
 ==========
 
 .. autofunction:: mongoengine.connect
+.. autofunction:: mongoengine.register_connection
 
 Documents
 =========
@@ -21,33 +22,83 @@ Documents
 .. autoclass:: mongoengine.EmbeddedDocument
    :members:
 
+.. autoclass:: mongoengine.DynamicDocument
+   :members:
+
+.. autoclass:: mongoengine.DynamicEmbeddedDocument
+   :members:
+
+.. autoclass:: mongoengine.document.MapReduceDocument
+  :members:
+
+.. autoclass:: mongoengine.ValidationError
+  :members:
+
+Context Managers
+================
+
+.. autoclass:: mongoengine.context_managers.switch_db
+.. autoclass:: mongoengine.context_managers.no_dereference
+.. autoclass:: mongoengine.context_managers.query_counter
+
 Querying
 ========
 
-.. autoclass:: mongoengine.queryset.QuerySet
+.. automodule:: mongoengine.queryset
-   :members:
+    :synopsis: Queryset level operations
 
-   .. automethod:: mongoengine.queryset.QuerySet.__call__
+    .. autoclass:: mongoengine.queryset.QuerySet
+      :members:
+      :inherited-members:
 
-.. autofunction:: mongoengine.queryset.queryset_manager
+      .. automethod:: QuerySet.__call__
+
+    .. autoclass:: mongoengine.queryset.QuerySetNoCache
+      :members:
+
+       .. automethod:: mongoengine.queryset.QuerySetNoCache.__call__
+
+    .. autofunction:: mongoengine.queryset.queryset_manager
 
 Fields
 ======
 
-.. autoclass:: mongoengine.StringField
+.. autoclass:: mongoengine.base.fields.BaseField
+.. autoclass:: mongoengine.fields.StringField
+.. autoclass:: mongoengine.fields.URLField
+.. autoclass:: mongoengine.fields.EmailField
+.. autoclass:: mongoengine.fields.IntField
+.. autoclass:: mongoengine.fields.LongField
+.. autoclass:: mongoengine.fields.FloatField
+.. autoclass:: mongoengine.fields.DecimalField
+.. autoclass:: mongoengine.fields.BooleanField
+.. autoclass:: mongoengine.fields.DateTimeField
+.. autoclass:: mongoengine.fields.ComplexDateTimeField
+.. autoclass:: mongoengine.fields.EmbeddedDocumentField
+.. autoclass:: mongoengine.fields.GenericEmbeddedDocumentField
+.. autoclass:: mongoengine.fields.DynamicField
+.. autoclass:: mongoengine.fields.ListField
+.. autoclass:: mongoengine.fields.SortedListField
+.. autoclass:: mongoengine.fields.DictField
+.. autoclass:: mongoengine.fields.MapField
+.. autoclass:: mongoengine.fields.ReferenceField
+.. autoclass:: mongoengine.fields.GenericReferenceField
+.. autoclass:: mongoengine.fields.BinaryField
+.. autoclass:: mongoengine.fields.FileField
+.. autoclass:: mongoengine.fields.ImageField
+.. autoclass:: mongoengine.fields.SequenceField
+.. autoclass:: mongoengine.fields.ObjectIdField
+.. autoclass:: mongoengine.fields.UUIDField
+.. autoclass:: mongoengine.fields.GeoPointField
+.. autoclass:: mongoengine.fields.PointField
+.. autoclass:: mongoengine.fields.LineStringField
+.. autoclass:: mongoengine.fields.PolygonField
+.. autoclass:: mongoengine.fields.GridFSError
+.. autoclass:: mongoengine.fields.GridFSProxy
+.. autoclass:: mongoengine.fields.ImageGridFsProxy
+.. autoclass:: mongoengine.fields.ImproperlyConfigured
 
-.. autoclass:: mongoengine.IntField
+Misc
+====
 
-.. autoclass:: mongoengine.FloatField
+.. autofunction:: mongoengine.common._import_class
-
-.. autoclass:: mongoengine.BooleanField
-
-.. autoclass:: mongoengine.DateTimeField
-
-.. autoclass:: mongoengine.EmbeddedDocumentField
-
-.. autoclass:: mongoengine.ListField
-
-.. autoclass:: mongoengine.ObjectIdField
-
-.. autoclass:: mongoengine.ReferenceField

docs/changelog.rst

@@ -2,6 +2,578 @@
 Changelog
 =========
 
+Changes in 0.8.4
+================
+- Remove database name necessity in uri connection schema (#452)
+- Fixed "$pull" semantics for nested ListFields (#447)
+- Allow fields to be named the same as query operators (#445)
+- Updated field filter logic - can now exclude subclass fields (#443)
+- Fixed dereference issue with embedded listfield referencefields (#439)
+- Fixed slice when using inheritance causing fields to be excluded (#437)
+- Fixed ._get_db() attribute after a Document.switch_db() (#441)
+- Dynamic Fields store and recompose Embedded Documents / Documents correctly (#449)
+- Handle dynamic fieldnames that look like digits (#434)
+- Added get_user_document and improve mongo_auth module (#423)
+- Added str representation of GridFSProxy (#424)
+- Update transform to handle docs erroneously passed to unset (#416)
+- Fixed indexing - turn off _cls (#414)
+- Fixed dereference threading issue in ComplexField.__get__ (#412)
+- Fixed QuerySetNoCache.count() caching (#410)
+- Don't follow references in _get_changed_fields (#422, #417)
+- Allow args and kwargs to be passed through to_json (#420)
+
+Changes in 0.8.3
+================
+- Fixed EmbeddedDocuments with `id` also storing `_id` (#402)
+- Added get_proxy_object helper to filefields (#391)
+- Added QuerySetNoCache and QuerySet.no_cache() for lower memory consumption (#365)
+- Fixed sum and average mapreduce dot notation support (#375, #376, #393)
+- Fixed as_pymongo to return the id (#386)
+- Document.select_related() now respects `db_alias` (#377)
+- Reload uses shard_key if applicable (#384)
+- Dynamic fields are ordered based on creation and stored in _fields_ordered (#396)
+
+  **Potential breaking change:** http://docs.mongoengine.org/en/latest/upgrade.html#to-0-8-3
+
+- Fixed pickling dynamic documents `_dynamic_fields` (#387)
+- Fixed ListField setslice and delslice dirty tracking (#390)
+- Added Django 1.5 PY3 support (#392)
+- Added match ($elemMatch) support for EmbeddedDocuments (#379)
+- Fixed weakref being valid after reload (#374)
+- Fixed queryset.get() respecting no_dereference (#373)
+- Added full_result kwarg to update (#380)
+
+
+
+Changes in 0.8.2
+================
+- Added compare_indexes helper (#361)
+- Fixed cascading saves which weren't turned off as planned (#291)
+- Fixed Datastructures so instances are a Document or EmbeddedDocument (#363)
+- Improved cascading saves write performance (#361)
+- Fixed ambiguity and differing behaviour regarding field defaults (#349)
+- ImageFields now include PIL error messages if invalid error (#353)
+- Added lock when calling doc.Delete() for when signals have no sender (#350)
+- Reload forces read preference to be PRIMARY (#355)
+- Querysets are now lest restrictive when querying duplicate fields (#332, #333)
+- FileField now honouring db_alias (#341)
+- Removed customised __set__ change tracking in ComplexBaseField (#344)
+- Removed unused var in _get_changed_fields (#347)
+- Added pre_save_post_validation signal (#345)
+- DateTimeField now auto converts valid datetime isostrings into dates (#343)
+- DateTimeField now uses dateutil for parsing if available (#343)
+- Fixed Doc.objects(read_preference=X) not setting read preference (#352)
+- Django session ttl index expiry fixed (#329)
+- Fixed pickle.loads (#342)
+- Documentation fixes
+
+Changes in 0.8.1
+================
+- Fixed Python 2.6 django auth importlib issue (#326)
+- Fixed pickle unsaved document regression (#327)
+
+Changes in 0.8.0
+================
+- Fixed querying ReferenceField custom_id (#317)
+- Fixed pickle issues with collections (#316)
+- Added `get_next_value` preview for SequenceFields (#319)
+- Added no_sub_classes context manager and queryset helper (#312)
+- Querysets now utilises a local cache
+- Changed __len__ behavour in the queryset (#247, #311)
+- Fixed querying string versions of ObjectIds issue with ReferenceField (#307)
+- Added $setOnInsert support for upserts (#308)
+- Upserts now possible with just query parameters (#309)
+- Upserting is the only way to ensure docs are saved correctly (#306)
+- Fixed register_delete_rule inheritance issue
+- Fix cloning of sliced querysets (#303)
+- Fixed update_one write concern (#302)
+- Updated minimum requirement for pymongo to 2.5
+- Add support for new geojson fields, indexes and queries (#299)
+- If values cant be compared mark as changed (#287)
+- Ensure as_pymongo() and to_json honour only() and exclude() (#293)
+- Document serialization uses field order to ensure a strict order is set (#296)
+- DecimalField now stores as float not string (#289)
+- UUIDField now stores as a binary by default (#292)
+- Added Custom User Model for Django 1.5 (#285)
+- Cascading saves now default to off (#291)
+- ReferenceField now store ObjectId's by default rather than DBRef (#290)
+- Added ImageField support for inline replacements (#86)
+- Added SequenceField.set_next_value(value) helper (#159)
+- Updated .only() behaviour - now like exclude it is chainable (#202)
+- Added with_limit_and_skip support to count() (#235)
+- Objects queryset manager now inherited (#256)
+- Updated connection to use MongoClient (#262, #274)
+- Fixed db_alias and inherited Documents (#143)
+- Documentation update for document errors (#124)
+- Deprecated `get_or_create` (#35)
+- Updated inheritable objects created by upsert now contain _cls (#118)
+- Added support for creating documents with embedded documents in a single operation (#6)
+- Added to_json and from_json to Document (#1)
+- Added to_json and from_json to QuerySet (#131)
+- Updated index creation now tied to Document class (#102)
+- Added none() to queryset (#127)
+- Updated SequenceFields to allow post processing of the calculated counter value (#141)
+- Added clean method to documents for pre validation data cleaning (#60)
+- Added support setting for read prefrence at a query level (#157)
+- Added _instance to EmbeddedDocuments pointing to the parent (#139)
+- Inheritance is off by default (#122)
+- Remove _types and just use _cls for inheritance (#148)
+- Only allow QNode instances to be passed as query objects (#199)
+- Dynamic fields are now validated on save (#153) (#154)
+- Added support for multiple slices and made slicing chainable. (#170) (#190) (#191)
+- Fixed GridFSProxy __getattr__ behaviour (#196)
+- Fix Django timezone support (#151)
+- Simplified Q objects, removed QueryTreeTransformerVisitor (#98) (#171)
+- FileFields now copyable (#198)
+- Querysets now return clones and are no longer edit in place (#56)
+- Added support for $maxDistance (#179)
+- Uses getlasterror to test created on updated saves (#163)
+- Fixed inheritance and unique index creation (#140)
+- Fixed reverse delete rule with inheritance (#197)
+- Fixed validation for GenericReferences which havent been dereferenced
+- Added switch_db context manager (#106)
+- Added switch_db method to document instances (#106)
+- Added no_dereference context manager (#82) (#61)
+- Added switch_collection context manager (#220)
+- Added switch_collection method to document instances (#220)
+- Added support for compound primary keys (#149) (#121)
+- Fixed overriding objects with custom manager (#58)
+- Added no_dereference method for querysets (#82) (#61)
+- Undefined data should not override instance methods (#49)
+- Added Django Group and Permission (#142)
+- Added Doc class and pk to Validation messages (#69)
+- Fixed Documents deleted via a queryset don't call any signals (#105)
+- Added the "get_decoded" method to the MongoSession class (#216)
+- Fixed invalid choices error bubbling (#214)
+- Updated Save so it calls $set and $unset in a single operation (#211)
+- Fixed inner queryset looping (#204)
+
+Changes in 0.7.10
+=================
+- Fix UnicodeEncodeError for dbref (#278)
+- Allow construction using positional parameters (#268)
+- Updated EmailField length to support long domains (#243)
+- Added 64-bit integer support (#251)
+- Added Django sessions TTL support (#224)
+- Fixed issue with numerical keys in MapField(EmbeddedDocumentField()) (#240)
+- Fixed clearing _changed_fields for complex nested embedded documents (#237, #239, #242)
+- Added "id" back to _data dictionary (#255)
+- Only mark a field as changed if the value has changed (#258)
+- Explicitly check for Document instances when dereferencing (#261)
+- Fixed order_by chaining issue (#265)
+- Added dereference support for tuples (#250)
+- Resolve field name to db field name when using distinct(#260, #264, #269)
+- Added kwargs to doc.save to help interop with django (#223, #270)
+- Fixed cloning querysets in PY3
+- Int fields no longer unset in save when changed to 0 (#272)
+- Fixed ReferenceField query chaining bug fixed (#254)
+
+Changes in 0.7.9
+================
+- Better fix handling for old style _types
+- Embedded SequenceFields follow collection naming convention
+
+Changes in 0.7.8
+================
+- Fix sequence fields in embedded documents (#166)
+- Fix query chaining with .order_by() (#176)
+- Added optional encoding and collection config for Django sessions (#180, #181, #183)
+- Fixed EmailField so can add extra validation (#173, #174, #187)
+- Fixed bulk inserts can now handle custom pk's (#192)
+- Added as_pymongo method to return raw or cast results from pymongo (#193)
+
+Changes in 0.7.7
+================
+- Fix handling for old style _types
+
+Changes in 0.7.6
+================
+- Unicode fix for repr (#133)
+- Allow updates with match operators (#144)
+- Updated URLField - now can have a override the regex (#136)
+- Allow Django AuthenticationBackends to work with Django user (hmarr/mongoengine#573)
+- Fixed reload issue with ReferenceField where dbref=False (#138)
+
+Changes in 0.7.5
+================
+- ReferenceFields with dbref=False use ObjectId instead of strings (#134)
+  See ticket for upgrade notes (#134)
+
+Changes in 0.7.4
+================
+- Fixed index inheritance issues - firmed up testcases (#123) (#125)
+
+Changes in 0.7.3
+================
+- Reverted EmbeddedDocuments meta handling - now can turn off inheritance (#119)
+
+Changes in 0.7.2
+================
+- Update index spec generation so its not destructive (#113)
+
+Changes in 0.7.1
+=================
+- Fixed index spec inheritance (#111)
+
+Changes in 0.7.0
+=================
+- Updated queryset.delete so you can use with skip / limit (#107)
+- Updated index creation allows kwargs to be passed through refs (#104)
+- Fixed Q object merge edge case (#109)
+- Fixed reloading on sharded documents (hmarr/mongoengine#569)
+- Added NotUniqueError for duplicate keys (#62)
+- Added custom collection / sequence naming for SequenceFields (#92)
+- Fixed UnboundLocalError in composite index with pk field (#88)
+- Updated ReferenceField's to optionally store ObjectId strings
+  this will become the default in 0.8 (#89)
+- Added FutureWarning - save will default to `cascade=False` in 0.8
+- Added example of indexing embedded document fields (#75)
+- Fixed ImageField resizing when forcing size (#80)
+- Add flexibility for fields handling bad data (#78)
+- Embedded Documents no longer handle meta definitions
+- Use weakref proxies in base lists / dicts (#74)
+- Improved queryset filtering (hmarr/mongoengine#554)
+- Fixed Dynamic Documents and Embedded Documents (hmarr/mongoengine#561)
+- Fixed abstract classes and shard keys (#64)
+- Fixed Python 2.5 support
+- Added Python 3 support (thanks to Laine Heron)
+
+Changes in 0.6.20
+=================
+- Added support for distinct and db_alias (#59)
+- Improved support for chained querysets when constraining the same fields (hmarr/mongoengine#554)
+- Fixed BinaryField lookup re (#48)
+
+Changes in 0.6.19
+=================
+
+- Added Binary support to UUID (#47)
+- Fixed MapField lookup for fields without declared lookups (#46)
+- Fixed BinaryField python value issue (#48)
+- Fixed SequenceField non numeric value lookup (#41)
+- Fixed queryset manager issue (#52)
+- Fixed FileField comparision (hmarr/mongoengine#547)
+
+Changes in 0.6.18
+=================
+- Fixed recursion loading bug in _get_changed_fields
+
+Changes in 0.6.17
+=================
+- Fixed issue with custom queryset manager expecting explict variable names
+
+Changes in 0.6.16
+=================
+- Fixed issue where db_alias wasn't inherited
+
+Changes in 0.6.15
+=================
+- Updated validation error messages
+- Added support for null / zero / false values in item_frequencies
+- Fixed cascade save edge case
+- Fixed geo index creation through reference fields
+- Added support for args / kwargs when using @queryset_manager
+- Deref list custom id fix
+
+Changes in 0.6.14
+=================
+- Fixed error dict with nested validation
+- Fixed Int/Float fields and not equals None
+- Exclude tests from installation
+- Allow tuples for index meta
+- Fixed use of str in instance checks
+- Fixed unicode support in transform update
+- Added support for add_to_set and each
+
+Changes in 0.6.13
+=================
+- Fixed EmbeddedDocument db_field validation issue
+- Fixed StringField unicode issue
+- Fixes __repr__ modifying the cursor
+
+Changes in 0.6.12
+=================
+- Fixes scalar lookups for primary_key
+- Fixes error with _delta handling DBRefs
+
+Changes in 0.6.11
+==================
+- Fixed inconsistency handling None values field attrs
+- Fixed map_field embedded db_field issue
+- Fixed .save() _delta issue with DbRefs
+- Fixed Django TestCase
+- Added cmp to Embedded Document
+- Added PULL reverse_delete_rule
+- Fixed CASCADE delete bug
+- Fixed db_field data load error
+- Fixed recursive save with FileField
+
+Changes in 0.6.10
+=================
+- Fixed basedict / baselist to return super(..)
+- Promoted BaseDynamicField to DynamicField
+
+Changes in 0.6.9
+================
+- Fixed sparse indexes on inherited docs
+- Removed FileField auto deletion, needs more work maybe 0.7
+
+Changes in 0.6.8
+================
+- Fixed FileField losing reference when no default set
+- Removed possible race condition from FileField (grid_file)
+- Added assignment to save, can now do: `b = MyDoc(**kwargs).save()`
+- Added support for pull operations on nested EmbeddedDocuments
+- Added support for choices with GenericReferenceFields
+- Added support for choices with GenericEmbeddedDocumentFields
+- Fixed Django 1.4 sessions first save data loss
+- FileField now automatically delete files on .delete()
+- Fix for GenericReference to_mongo method
+- Fixed connection regression
+- Updated Django User document, now allows inheritance
+
+Changes in 0.6.7
+================
+- Fixed indexing on '_id' or 'pk' or 'id'
+- Invalid data from the DB now raises a InvalidDocumentError
+- Cleaned up the Validation Error - docs and code
+- Added meta `auto_create_index` so you can disable index creation
+- Added write concern options to inserts
+- Fixed typo in meta for index options
+- Bug fix Read preference now passed correctly
+- Added support for File like objects for GridFS
+- Fix for #473 - Dereferencing abstracts
+
+Changes in 0.6.6
+================
+- Django 1.4 fixed (finally)
+- Added tests for Django
+
+Changes in 0.6.5
+================
+- More Django updates
+
+Changes in 0.6.4
+================
+
+- Refactored connection / fixed replicasetconnection
+- Bug fix for unknown connection alias error message
+- Sessions support Django 1.3 and Django 1.4
+- Minor fix for ReferenceField
+
+Changes in 0.6.3
+================
+- Updated sessions for Django 1.4
+- Bug fix for updates where listfields contain embedded documents
+- Bug fix for collection naming and mixins
+
+Changes in 0.6.2
+================
+- Updated documentation for ReplicaSet connections
+- Hack round _types issue with SERVER-5247 - querying other arrays may also cause problems.
+
+Changes in 0.6.1
+================
+- Fix for replicaSet connections
+
+Changes in 0.6
+================
+
+- Added FutureWarning to inherited classes not declaring 'allow_inheritance' as the default will change in 0.7
+- Added support for covered indexes when inheritance is off
+- No longer always upsert on save for items with a '_id'
+- Error raised if update doesn't have an operation
+- DeReferencing is now thread safe
+- Errors raised if trying to perform a join in a query
+- Updates can now take __raw__ queries
+- Added custom 2D index declarations
+- Added replicaSet connection support
+- Updated deprecated imports from pymongo (safe for pymongo 2.2)
+- Added uri support for connections
+- Added scalar for efficiently returning partial data values (aliased to values_list)
+- Fixed limit skip bug
+- Improved Inheritance / Mixin
+- Added sharding support
+- Added pymongo 2.1 support
+- Fixed Abstract documents can now declare indexes
+- Added db_alias support to individual documents
+- Fixed GridFS documents can now be pickled
+- Added Now raises an InvalidDocumentError when declaring multiple fields with the same db_field
+- Added InvalidQueryError when calling with_id with a filter
+- Added support for DBRefs in distinct()
+- Fixed issue saving False booleans
+- Fixed issue with dynamic documents deltas
+- Added Reverse Delete Rule support to ListFields - MapFields aren't supported
+- Added customisable cascade kwarg options
+- Fixed Handle None values for non-required fields
+- Removed Document._get_subclasses() - no longer required
+- Fixed bug requiring subclasses when not actually needed
+- Fixed deletion of dynamic data
+- Added support for the $elementMatch operator
+- Added reverse option to SortedListFields
+- Fixed dereferencing - multi directional list dereferencing
+- Fixed issue creating indexes with recursive embedded documents
+- Fixed recursive lookup in _unique_with_indexes
+- Fixed passing ComplexField defaults to constructor for ReferenceFields
+- Fixed validation of DictField Int keys
+- Added optional cascade saving
+- Fixed dereferencing - max_depth now taken into account
+- Fixed document mutation saving issue
+- Fixed positional operator when replacing embedded documents
+- Added Non-Django Style choices back (you can have either)
+- Fixed __repr__ of a sliced queryset
+- Added recursive validation error of documents / complex fields
+- Fixed breaking during queryset iteration
+- Added pre and post bulk-insert signals
+- Added ImageField - requires PIL
+- Fixed Reference Fields can be None in get_or_create / queries
+- Fixed accessing pk on an embedded document
+- Fixed calling a queryset after drop_collection now recreates the collection
+- Add field name to validation exception messages
+- Added UUID field
+- Improved efficiency of .get()
+- Updated ComplexFields so if required they won't accept empty lists / dicts
+- Added spec file for rpm-based distributions
+- Fixed ListField so it doesnt accept strings
+- Added DynamicDocument and EmbeddedDynamicDocument classes for expando schemas
+
+Changes in v0.5.2
+=================
+
+- A Robust Circular reference bugfix
+
+
+Changes in v0.5.1
+=================
+
+- Fixed simple circular reference bug
+
+Changes in v0.5
+===============
+
+- Added InvalidDocumentError - so Document core methods can't be overwritten
+- Added GenericEmbeddedDocument - so you can embed any type of embeddable document
+- Added within_polygon support - for those with mongodb 1.9
+- Updated sum / average to use map_reduce as db.eval doesn't work in sharded environments
+- Added where() - filter to allowing users to specify query expressions as Javascript
+- Added SequenceField - for creating sequential counters
+- Added update() convenience method to a document
+- Added cascading saves - so changes to Referenced documents are saved on .save()
+- Added select_related() support
+- Added support for the positional operator
+- Updated geo index checking to be recursive and check in embedded documents
+- Updated default collection naming convention
+- Added Document Mixin support
+- Fixed queryet __repr__ mid iteration
+- Added hint() support, so cantell Mongo the proper index to use for the query
+- Fixed issue with inconsitent setting of _cls breaking inherited referencing
+- Added help_text and verbose_name to fields to help with some form libs
+- Updated item_frequencies to handle embedded document lookups
+- Added delta tracking now only sets / unsets explicitly changed fields
+- Fixed saving so sets updated values rather than overwrites
+- Added ComplexDateTimeField - Handles datetimes correctly with microseconds
+- Added ComplexBaseField - for improved flexibility and performance
+- Added get_FIELD_display() method for easy choice field displaying
+- Added queryset.slave_okay(enabled) method
+- Updated queryset.timeout(enabled) and queryset.snapshot(enabled) to be chainable
+- Added insert method for bulk inserts
+- Added blinker signal support
+- Added query_counter context manager for tests
+- Added map_reduce method item_frequencies and set as default (as db.eval doesn't work in sharded environments)
+- Added inline_map_reduce option to map_reduce
+- Updated connection exception so it provides more info on the cause.
+- Added searching multiple levels deep in ``DictField``
+- Added ``DictField`` entries containing strings to use matching operators
+- Added ``MapField``, similar to ``DictField``
+- Added Abstract Base Classes
+- Added Custom Objects Managers
+- Added sliced subfields updating
+- Added ``NotRegistered`` exception if dereferencing ``Document`` not in the registry
+- Added a write concern for ``save``, ``update``, ``update_one`` and ``get_or_create``
+- Added slicing / subarray fetching controls
+- Fixed various unique index and other index issues
+- Fixed threaded connection issues
+- Added spherical geospatial query operators
+- Updated queryset to handle latest version of pymongo
+  map_reduce now requires an output.
+- Added ``Document`` __hash__, __ne__ for pickling
+- Added ``FileField`` optional size arg for read method
+- Fixed ``FileField`` seek and tell methods for reading files
+- Added ``QuerySet.clone`` to support copying querysets
+- Fixed item_frequencies when using name thats the same as a native js function
+- Added reverse delete rules
+- Fixed issue with unset operation
+- Fixed Q-object bug
+- Added ``QuerySet.all_fields`` resets previous .only() and .exclude()
+- Added ``QuerySet.exclude``
+- Added django style choices
+- Fixed order and filter issue
+- Added ``QuerySet.only`` subfield support
+- Added creation_counter to ``BaseField`` allowing fields to be sorted in the
+  way the user has specified them
+- Fixed various errors
+- Added many tests
+
+Changes in v0.4
+===============
+- Added ``GridFSStorage`` Django storage backend
+- Added ``FileField`` for GridFS support
+- New Q-object implementation, which is no longer based on Javascript
+- Added ``SortedListField``
+- Added ``EmailField``
+- Added ``GeoPointField``
+- Added ``exact`` and ``iexact`` match operators to ``QuerySet``
+- Added ``get_document_or_404`` and ``get_list_or_404`` Django shortcuts
+- Added new query operators for Geo queries
+- Added ``not`` query operator
+- Added new update operators: ``pop`` and ``add_to_set``
+- Added ``__raw__`` query parameter
+- Added support for custom querysets
+- Fixed document inheritance primary key issue
+- Added support for querying by array element position
+- Base class can now be defined for ``DictField``
+- Fixed MRO error that occured on document inheritance
+- Added ``QuerySet.distinct``, ``QuerySet.create``, ``QuerySet.snapshot``,
+  ``QuerySet.timeout`` and ``QuerySet.all``
+- Subsequent calls to ``connect()`` now work
+- Introduced ``min_length`` for ``StringField``
+- Fixed multi-process connection issue
+- Other minor fixes
+
+Changes in v0.3
+===============
+- Added MapReduce support
+- Added ``contains``, ``startswith`` and ``endswith`` query operators (and
+  case-insensitive versions that are prefixed with 'i')
+- Deprecated fields' ``name`` parameter, replaced with ``db_field``
+- Added ``QuerySet.only`` for only retrieving specific fields
+- Added ``QuerySet.in_bulk()`` for bulk querying using ids
+- ``QuerySet``\ s now have a ``rewind()`` method, which is called automatically
+  when the iterator is exhausted, allowing ``QuerySet``\ s to be reused
+- Added ``DictField``
+- Added ``URLField``
+- Added ``DecimalField``
+- Added ``BinaryField``
+- Added ``GenericReferenceField``
+- Added ``get()`` and ``get_or_create()`` methods to ``QuerySet``
+- ``ReferenceField``\ s may now reference the document they are defined on
+  (recursive references) and documents that have not yet been defined
+- ``Document`` objects may now be compared for equality (equal if _ids are
+  equal and documents are of same type)
+- ``QuerySet`` update methods now have an ``upsert`` parameter
+- Added field name substitution for Javascript code (allows the user to use the
+  Python names for fields in JS, which are later substituted for the real field
+  names)
+- ``Q`` objects now support regex querying
+- Fixed bug where referenced documents within lists weren't properly
+  dereferenced
+- ``ReferenceField``\ s may now be queried using their _id
+- Fixed bug where ``EmbeddedDocuments`` couldn't be non-polymorphic
+- ``queryset_manager`` functions now accept two arguments -- the document class
+  as the first and the queryset as the second
+- Fixed bug where ``QuerySet.exec_js`` ignored ``Q`` objects
+- Other minor fixes
+
 Changes in v0.2.2
 =================
 - Fixed bug that prevented indexes from being used on ``ListField``\ s

docs/code/tumblelog.py

@@ -45,7 +45,7 @@ print 'ALL POSTS'
 print
 for post in Post.objects:
     print post.title
-    print '=' * len(post.title)
+    print '=' * post.title.count()
 
     if isinstance(post, TextPost):
         print post.content

docs/conf.py

@@ -16,13 +16,13 @@ import sys, os
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-sys.path.append(os.path.abspath('..'))
+sys.path.insert(0, os.path.abspath('..'))
 
 # -- General configuration -----------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ['sphinx.ext.autodoc']
+extensions = ['sphinx.ext.autodoc', 'sphinx.ext.todo']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
@@ -38,7 +38,7 @@ master_doc = 'index'
 
 # General information about the project.
 project = u'MongoEngine'
-copyright = u'2009, Harry Marr'
+copyright = u'2009, MongoEngine Authors'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -121,7 +121,7 @@ html_theme_path = ['_themes']
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-html_static_path = ['_static']
+#html_static_path = ['_static']
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.
@@ -132,7 +132,11 @@ html_static_path = ['_static']
 html_use_smartypants = True
 
 # Custom sidebar templates, maps document names to template names.
-#html_sidebars = {}
+html_sidebars = {
+    'index': ['globaltoc.html', 'searchbox.html'],
+    '**': ['localtoc.html', 'relations.html', 'searchbox.html']
+}
+
 
 # Additional templates that should be rendered to pages, maps page names to
 # template names.
@@ -173,8 +177,8 @@ latex_paper_size = 'a4'
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass [howto/manual]).
 latex_documents = [
-  ('index', 'MongoEngine.tex', u'MongoEngine Documentation',
+  ('index', 'MongoEngine.tex', 'MongoEngine Documentation',
-   u'Harry Marr', 'manual'),
+   'Ross Lawley', 'manual'),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -193,3 +197,6 @@ latex_documents = [
 
 # If false, no module index is generated.
 #latex_use_modindex = True
+
+autoclass_content = 'both'
+

docs/django.rst

@@ -1,6 +1,8 @@
-=============================
+==============
-Using MongoEngine with Django
+Django Support
-=============================
+==============
+
+.. note:: Updated to support Django 1.5
 
 Connecting
 ==========
@@ -8,6 +10,16 @@ In your **settings.py** file, ignore the standard database settings (unless you
 also plan to use the ORM in your project), and instead call
 :func:`~mongoengine.connect` somewhere in the settings module.
 
+.. note::
+   If you are not using another Database backend you may need to add a dummy
+   database backend to ``settings.py`` eg::
+
+        DATABASES = {
+            'default': {
+                'ENGINE': 'django.db.backends.dummy'
+            }
+        }
+
 Authentication
 ==============
 MongoEngine includes a Django authentication backend, which uses MongoDB. The
@@ -15,9 +27,9 @@ MongoEngine includes a Django authentication backend, which uses MongoDB. The
 :class:`~mongoengine.Document`, but implements most of the methods and
 attributes that the standard Django :class:`User` model does - so the two are
 moderately compatible. Using this backend will allow you to store users in
-MongoDB but still use many of the Django authentication infrastucture (such as
+MongoDB but still use many of the Django authentication infrastructure (such as
 the :func:`login_required` decorator and the :func:`authenticate` function). To
-enable the MongoEngine auth backend, add the following to you **settings.py**
+enable the MongoEngine auth backend, add the following to your **settings.py**
 file::
 
     AUTHENTICATION_BACKENDS = (
@@ -30,17 +42,131 @@ The :mod:`~mongoengine.django.auth` module also contains a
 
 .. versionadded:: 0.1.3
 
+Custom User model
+=================
+Django 1.5 introduced `Custom user Models
+<https://docs.djangoproject.com/en/dev/topics/auth/customizing/#auth-custom-user>`_
+which can be used as an alternative to the MongoEngine authentication backend.
+
+The main advantage of this option is that other components relying on
+:mod:`django.contrib.auth` and supporting the new swappable user model are more
+likely to work. For example, you can use the ``createsuperuser`` management
+command as usual.
+
+To enable the custom User model in Django, add ``'mongoengine.django.mongo_auth'``
+in your ``INSTALLED_APPS`` and set ``'mongo_auth.MongoUser'`` as the custom user
+user model to use. In your **settings.py** file you will have::
+
+    INSTALLED_APPS = (
+        ...
+        'django.contrib.auth',
+        'mongoengine.django.mongo_auth',
+        ...
+    )
+
+    AUTH_USER_MODEL = 'mongo_auth.MongoUser'
+
+An additional ``MONGOENGINE_USER_DOCUMENT`` setting enables you to replace the
+:class:`~mongoengine.django.auth.User` class with another class of your choice::
+
+    MONGOENGINE_USER_DOCUMENT = 'mongoengine.django.auth.User'
+
+The custom :class:`User` must be a :class:`~mongoengine.Document` class, but
+otherwise has the same requirements as a standard custom user model,
+as specified in the `Django Documentation
+<https://docs.djangoproject.com/en/dev/topics/auth/customizing/>`_.
+In particular, the custom class must define :attr:`USERNAME_FIELD` and
+:attr:`REQUIRED_FIELDS` attributes.
+
 Sessions
 ========
 Django allows the use of different backend stores for its sessions. MongoEngine
 provides a MongoDB-based session backend for Django, which allows you to use
-sessions in you Django application with just MongoDB. To enable the MongoEngine
+sessions in your Django application with just MongoDB. To enable the MongoEngine
 session backend, ensure that your settings module has
 ``'django.contrib.sessions.middleware.SessionMiddleware'`` in the
 ``MIDDLEWARE_CLASSES`` field  and ``'django.contrib.sessions'`` in your
 ``INSTALLED_APPS``. From there, all you need to do is add the following line
-into you settings module::
+into your settings module::
 
     SESSION_ENGINE = 'mongoengine.django.sessions'
 
+Django provides session cookie, which expires after ```SESSION_COOKIE_AGE``` seconds, but doesn't delete cookie at sessions backend, so ``'mongoengine.django.sessions'`` supports  `mongodb TTL
+<http://docs.mongodb.org/manual/tutorial/expire-data/>`_.
+
 .. versionadded:: 0.2.1
+
+Storage
+=======
+With MongoEngine's support for GridFS via the :class:`~mongoengine.fields.FileField`,
+it is useful to have a Django file storage backend that wraps this. The new
+storage module is called :class:`~mongoengine.django.storage.GridFSStorage`.
+Using it is very similar to using the default FileSystemStorage.::
+
+    from mongoengine.django.storage import GridFSStorage
+    fs = GridFSStorage()
+
+    filename = fs.save('hello.txt', 'Hello, World!')
+
+All of the `Django Storage API methods
+<http://docs.djangoproject.com/en/dev/ref/files/storage/>`_ have been
+implemented except :func:`path`. If the filename provided already exists, an
+underscore and a number (before # the file extension, if one exists) will be
+appended to the filename until the generated filename doesn't exist. The
+:func:`save` method will return the new filename.::
+
+    >>> fs.exists('hello.txt')
+    True
+    >>> fs.open('hello.txt').read()
+    'Hello, World!'
+    >>> fs.size('hello.txt')
+    13
+    >>> fs.url('hello.txt')
+    'http://your_media_url/hello.txt'
+    >>> fs.open('hello.txt').name
+    'hello.txt'
+    >>> fs.listdir()
+    ([], [u'hello.txt'])
+
+All files will be saved and retrieved in GridFS via the :class:`FileDocument`
+document, allowing easy access to the files without the GridFSStorage
+backend.::
+
+    >>> from mongoengine.django.storage import FileDocument
+    >>> FileDocument.objects()
+    [<FileDocument: FileDocument object>]
+
+.. versionadded:: 0.4
+
+Shortcuts
+=========
+Inspired by the `Django shortcut get_object_or_404
+<https://docs.djangoproject.com/en/dev/topics/http/shortcuts/#get-object-or-404>`_,
+the :func:`~mongoengine.django.shortcuts.get_document_or_404` method returns 
+a document or raises an Http404 exception if the document does not exist::
+
+    from mongoengine.django.shortcuts import get_document_or_404
+    
+    admin_user = get_document_or_404(User, username='root')
+
+The first argument may be a Document or QuerySet object. All other passed arguments
+and keyword arguments are used in the query::
+
+    foo_email = get_document_or_404(User.objects.only('email'), username='foo', is_active=True).email
+
+.. note:: Like with :func:`get`, a MultipleObjectsReturned will be raised if more than one
+    object is found.
+
+
+Also inspired by the `Django shortcut get_list_or_404
+<https://docs.djangoproject.com/en/dev/topics/http/shortcuts/#get-list-or-404>`_,
+the :func:`~mongoengine.django.shortcuts.get_list_or_404` method returns a list of
+documents or raises an Http404 exception if the list is empty::
+
+    from mongoengine.django.shortcuts import get_list_or_404
+    
+    active_users = get_list_or_404(User, is_active=True)
+
+The first argument may be a Document or QuerySet object. All other passed
+arguments and keyword arguments are used to filter the query.
+

docs/guide/connecting.rst

@@ -3,18 +3,100 @@
 =====================
 Connecting to MongoDB
 =====================
+
 To connect to a running instance of :program:`mongod`, use the
 :func:`~mongoengine.connect` function. The first argument is the name of the
-database to connect to. If the database does not exist, it will be created. If
+database to connect to::
-the database requires authentication, :attr:`username` and :attr:`password`
-arguments may be provided::
 
     from mongoengine import connect
-    connect('project1', username='webapp', password='pwd123')
+    connect('project1')
 
 By default, MongoEngine assumes that the :program:`mongod` instance is running
-on **localhost** on port **27017**. If MongoDB is running elsewhere, you may
+on **localhost** on port **27017**. If MongoDB is running elsewhere, you should
-provide :attr:`host` and :attr:`port` arguments to
+provide the :attr:`host` and :attr:`port` arguments to
 :func:`~mongoengine.connect`::
 
     connect('project1', host='192.168.1.35', port=12345)
+
+If the database requires authentication, :attr:`username` and :attr:`password`
+arguments should be provided::
+
+    connect('project1', username='webapp', password='pwd123')
+
+Uri style connections are also supported - just supply the uri as
+the :attr:`host` to
+:func:`~mongoengine.connect`::
+
+    connect('project1', host='mongodb://localhost/database_name')
+
+Note that database name from uri has priority over name
+in ::func:`~mongoengine.connect`
+
+ReplicaSets
+===========
+
+MongoEngine supports :class:`~pymongo.mongo_replica_set_client.MongoReplicaSetClient`
+to use them please use a URI style connection and provide the `replicaSet` name in the
+connection kwargs.
+
+Read preferences are supported through the connection or via individual
+queries by passing the read_preference ::
+
+    Bar.objects().read_preference(ReadPreference.PRIMARY)
+    Bar.objects(read_preference=ReadPreference.PRIMARY)
+
+Multiple Databases
+==================
+
+Multiple database support was added in MongoEngine 0.6. To use multiple
+databases you can use :func:`~mongoengine.connect` and provide an `alias` name
+for the connection - if no `alias` is provided then "default" is used.
+
+In the background this uses :func:`~mongoengine.register_connection` to
+store the data and you can register all aliases up front if required.
+
+Individual documents can also support multiple databases by providing a
+`db_alias` in their meta data.  This allows :class:`~pymongo.dbref.DBRef` objects
+to point across databases and collections.  Below is an example schema, using
+3 different databases to store data::
+
+        class User(Document):
+            name = StringField()
+
+            meta = {"db_alias": "user-db"}
+
+        class Book(Document):
+            name = StringField()
+
+            meta = {"db_alias": "book-db"}
+
+        class AuthorBooks(Document):
+            author = ReferenceField(User)
+            book = ReferenceField(Book)
+
+            meta = {"db_alias": "users-books-db"}
+
+
+Switch Database Context Manager
+===============================
+
+Sometimes you may want to switch the database to query against for a class
+for example, archiving older data into a separate database for performance
+reasons.
+
+The :class:`~mongoengine.context_managers.switch_db` context manager allows
+you to change the database alias for a given class allowing quick and easy
+access to the same User document across databases::
+
+        from mongoengine.context_managers import switch_db
+
+        class User(Document):
+            name = StringField()
+
+            meta = {"db_alias": "user-db"}
+
+        with switch_db(User, 'archive-user-db') as User:
+            User(name="Ross").save()  # Saves the 'archive-user-db'
+
+.. note:: Make sure any aliases have been registered with
+    :func:`~mongoengine.register_connection` before using the context manager.

docs/guide/defining-documents.rst

@@ -22,7 +22,39 @@ objects** as class attributes to the document class::
 
     class Page(Document):
         title = StringField(max_length=200, required=True)
-        date_modified = DateTimeField(default=datetime.now)
+        date_modified = DateTimeField(default=datetime.datetime.now)
+
+As BSON (the binary format for storing data in mongodb) is order dependent,
+documents are serialized based on their field order.
+
+Dynamic document schemas
+========================
+One of the benefits of MongoDb is dynamic schemas for a collection, whilst data
+should be planned and organised (after all explicit is better than implicit!)
+there are scenarios where having dynamic / expando style documents is desirable.
+
+:class:`~mongoengine.DynamicDocument` documents work in the same way as
+:class:`~mongoengine.Document` but any data / attributes set to them will also
+be saved ::
+
+    from mongoengine import *
+
+    class Page(DynamicDocument):
+        title = StringField(max_length=200, required=True)
+
+    # Create a new page and add tags
+    >>> page = Page(title='Using MongoEngine')
+    >>> page.tags = ['mongodb', 'mongoengine']
+    >>> page.save()
+
+    >>> Page.objects(tags='mongoengine').count()
+    >>> 1
+
+.. note::
+
+   There is one caveat on Dynamic Documents: fields cannot start with `_`
+
+Dynamic fields are stored in creation order *after* any declared fields.
 
 Fields
 ======
@@ -34,27 +66,123 @@ not provided. Default values may optionally be a callable, which will be called
 to retrieve the value (such as in the above example). The field types available
 are as follows:
 
-* :class:`~mongoengine.StringField`
+* :class:`~mongoengine.fields.BinaryField`
-* :class:`~mongoengine.IntField`
+* :class:`~mongoengine.fields.BooleanField`
-* :class:`~mongoengine.FloatField`
+* :class:`~mongoengine.fields.ComplexDateTimeField`
-* :class:`~mongoengine.DateTimeField`
+* :class:`~mongoengine.fields.DateTimeField`
-* :class:`~mongoengine.ListField`
+* :class:`~mongoengine.fields.DecimalField`
-* :class:`~mongoengine.ObjectIdField`
+* :class:`~mongoengine.fields.DictField`
-* :class:`~mongoengine.EmbeddedDocumentField`
+* :class:`~mongoengine.fields.DynamicField`
-* :class:`~mongoengine.ReferenceField`
+* :class:`~mongoengine.fields.EmailField`
+* :class:`~mongoengine.fields.EmbeddedDocumentField`
+* :class:`~mongoengine.fields.FileField`
+* :class:`~mongoengine.fields.FloatField`
+* :class:`~mongoengine.fields.GenericEmbeddedDocumentField`
+* :class:`~mongoengine.fields.GenericReferenceField`
+* :class:`~mongoengine.fields.GeoPointField`
+* :class:`~mongoengine.fields.ImageField`
+* :class:`~mongoengine.fields.IntField`
+* :class:`~mongoengine.fields.ListField`
+* :class:`~mongoengine.fields.MapField`
+* :class:`~mongoengine.fields.ObjectIdField`
+* :class:`~mongoengine.fields.ReferenceField`
+* :class:`~mongoengine.fields.SequenceField`
+* :class:`~mongoengine.fields.SortedListField`
+* :class:`~mongoengine.fields.StringField`
+* :class:`~mongoengine.fields.URLField`
+* :class:`~mongoengine.fields.UUIDField`
+
+Field arguments
+---------------
+Each field type can be customized by keyword arguments.  The following keyword
+arguments can be set on all fields:
+
+:attr:`db_field` (Default: None)
+    The MongoDB field name.
+
+:attr:`required` (Default: False)
+    If set to True and the field is not set on the document instance, a
+    :class:`~mongoengine.ValidationError` will be raised when the document is
+    validated.
+
+:attr:`default` (Default: None)
+    A value to use when no value is set for this field.
+
+    The definion of default parameters follow `the general rules on Python
+    <http://docs.python.org/reference/compound_stmts.html#function-definitions>`__,
+    which means that some care should be taken when dealing with default mutable objects
+    (like in :class:`~mongoengine.fields.ListField` or :class:`~mongoengine.fields.DictField`)::
+
+        class ExampleFirst(Document):
+            # Default an empty list
+            values = ListField(IntField(), default=list)
+
+        class ExampleSecond(Document):
+            # Default a set of values
+            values = ListField(IntField(), default=lambda: [1,2,3])
+
+        class ExampleDangerous(Document):
+            # This can make an .append call to  add values to the default (and all the following objects),
+            # instead to just an object
+            values = ListField(IntField(), default=[1,2,3])
+
+    .. note:: Unsetting a field with a default value will revert back to the default.
+
+:attr:`unique` (Default: False)
+    When True, no documents in the collection will have the same value for this
+    field.
+
+:attr:`unique_with` (Default: None)
+    A field name (or list of field names) that when taken together with this
+    field, will not have two documents in the collection with the same value.
+
+:attr:`primary_key` (Default: False)
+    When True, use this field as a primary key for the collection.  `DictField`
+    and `EmbeddedDocuments` both support being the primary key for a document.
+
+:attr:`choices` (Default: None)
+    An iterable (e.g. a list or tuple) of choices to which the value of this
+    field should be limited.
+
+    Can be either be a nested tuples of value (stored in mongo) and a
+    human readable key ::
+
+        SIZE = (('S', 'Small'),
+                ('M', 'Medium'),
+                ('L', 'Large'),
+                ('XL', 'Extra Large'),
+                ('XXL', 'Extra Extra Large'))
+
+
+        class Shirt(Document):
+            size = StringField(max_length=3, choices=SIZE)
+
+    Or a flat iterable just containing values ::
+
+        SIZE = ('S', 'M', 'L', 'XL', 'XXL')
+
+        class Shirt(Document):
+            size = StringField(max_length=3, choices=SIZE)
+
+:attr:`help_text` (Default: None)
+    Optional help text to output with the field - used by form libraries
+
+:attr:`verbose_name` (Default: None)
+    Optional human-readable name for the field - used by form libraries
+
 
 List fields
-^^^^^^^^^^^
+-----------
 MongoDB allows the storage of lists of items. To add a list of items to a
-:class:`~mongoengine.Document`, use the :class:`~mongoengine.ListField` field
+:class:`~mongoengine.Document`, use the :class:`~mongoengine.fields.ListField` field
-type. :class:`~mongoengine.ListField` takes another field object as its first
+type. :class:`~mongoengine.fields.ListField` takes another field object as its first
 argument, which specifies which type elements may be stored within the list::
 
     class Page(Document):
         tags = ListField(StringField(max_length=50))
 
 Embedded documents
-^^^^^^^^^^^^^^^^^^
+------------------
 MongoDB has the ability to embed documents within other documents. Schemata may
 be defined for these embedded documents, just as they may be for regular
 documents. To create an embedded document, just define a document as usual, but
@@ -65,20 +193,40 @@ inherit from :class:`~mongoengine.EmbeddedDocument` rather than
         content = StringField()
 
 To embed the document within another document, use the
-:class:`~mongoengine.EmbeddedDocumentField` field type, providing the embedded
+:class:`~mongoengine.fields.EmbeddedDocumentField` field type, providing the embedded
 document class as the first argument::
 
     class Page(Document):
         comments = ListField(EmbeddedDocumentField(Comment))
 
-    comment1 = Comment('Good work!')
+    comment1 = Comment(content='Good work!')
-    comment2 = Comment('Nice article!')
+    comment2 = Comment(content='Nice article!')
     page = Page(comments=[comment1, comment2])
 
+Dictionary Fields
+-----------------
+Often, an embedded document may be used instead of a dictionary -- generally
+this is recommended as dictionaries don't support validation or custom field
+types. However, sometimes you will not know the structure of what you want to
+store; in this situation a :class:`~mongoengine.fields.DictField` is appropriate::
+
+    class SurveyResponse(Document):
+        date = DateTimeField()
+        user = ReferenceField(User)
+        answers = DictField()
+
+    survey_response = SurveyResponse(date=datetime.now(), user=request.user)
+    response_form = ResponseForm(request.POST)
+    survey_response.answers = response_form.cleaned_data()
+    survey_response.save()
+
+Dictionaries can store complex data, other dictionaries, lists, references to
+other objects, so are the most flexible field type available.
+
 Reference fields
-^^^^^^^^^^^^^^^^
+----------------
 References may be stored to other documents in the database using the
-:class:`~mongoengine.ReferenceField`. Pass in another document class as the
+:class:`~mongoengine.fields.ReferenceField`. Pass in another document class as the
 first argument to the constructor, then simply assign document objects to the
 field::
 
@@ -99,10 +247,146 @@ field::
 The :class:`User` object is automatically turned into a reference behind the
 scenes, and dereferenced when the :class:`Page` object is retrieved.
 
+To add a :class:`~mongoengine.fields.ReferenceField` that references the document
+being defined, use the string ``'self'`` in place of the document class as the
+argument to :class:`~mongoengine.fields.ReferenceField`'s constructor. To reference a
+document that has not yet been defined, use the name of the undefined document
+as the constructor's argument::
+
+    class Employee(Document):
+        name = StringField()
+        boss = ReferenceField('self')
+        profile_page = ReferenceField('ProfilePage')
+
+    class ProfilePage(Document):
+        content = StringField()
+
+
+.. _one-to-many-with-listfields:
+
+One to Many with ListFields
+'''''''''''''''''''''''''''
+
+If you are implementing a one to many relationship via a list of references,
+then the references are stored as DBRefs and to query you need to pass an
+instance of the object to the query::
+
+    class User(Document):
+        name = StringField()
+
+    class Page(Document):
+        content = StringField()
+        authors = ListField(ReferenceField(User))
+
+    bob = User(name="Bob Jones").save()
+    john = User(name="John Smith").save()
+
+    Page(content="Test Page", authors=[bob, john]).save()
+    Page(content="Another Page", authors=[john]).save()
+
+    # Find all pages Bob authored
+    Page.objects(authors__in=[bob])
+
+    # Find all pages that both Bob and John have authored
+    Page.objects(authors__all=[bob, john])
+
+
+Dealing with deletion of referred documents
+'''''''''''''''''''''''''''''''''''''''''''
+By default, MongoDB doesn't check the integrity of your data, so deleting
+documents that other documents still hold references to will lead to consistency
+issues.  Mongoengine's :class:`ReferenceField` adds some functionality to
+safeguard against these kinds of database integrity problems, providing each
+reference with a delete rule specification.  A delete rule is specified by
+supplying the :attr:`reverse_delete_rule` attributes on the
+:class:`ReferenceField` definition, like this::
+
+    class Employee(Document):
+        ...
+        profile_page = ReferenceField('ProfilePage', reverse_delete_rule=mongoengine.NULLIFY)
+
+The declaration in this example means that when an :class:`Employee` object is
+removed, the :class:`ProfilePage` that belongs to that employee is removed as
+well.  If a whole batch of employees is removed, all profile pages that are
+linked are removed as well.
+
+Its value can take any of the following constants:
+
+:const:`mongoengine.DO_NOTHING`
+  This is the default and won't do anything.  Deletes are fast, but may cause
+  database inconsistency or dangling references.
+:const:`mongoengine.DENY`
+  Deletion is denied if there still exist references to the object being
+  deleted.
+:const:`mongoengine.NULLIFY`
+  Any object's fields still referring to the object being deleted are removed
+  (using MongoDB's "unset" operation), effectively nullifying the relationship.
+:const:`mongoengine.CASCADE`
+  Any object containing fields that are refererring to the object being deleted
+  are deleted first.
+:const:`mongoengine.PULL`
+  Removes the reference to the object (using MongoDB's "pull" operation)
+  from any object's fields of
+  :class:`~mongoengine.fields.ListField` (:class:`~mongoengine.fields.ReferenceField`).
+
+
+.. warning::
+   A safety note on setting up these delete rules!  Since the delete rules are
+   not recorded on the database level by MongoDB itself, but instead at runtime,
+   in-memory, by the MongoEngine module, it is of the upmost importance
+   that the module that declares the relationship is loaded **BEFORE** the
+   delete is invoked.
+
+   If, for example, the :class:`Employee` object lives in the
+   :mod:`payroll` app, and the :class:`ProfilePage` in the :mod:`people`
+   app, it is extremely important that the :mod:`people` app is loaded
+   before any employee is removed, because otherwise, MongoEngine could
+   never know this relationship exists.
+
+   In Django, be sure to put all apps that have such delete rule declarations in
+   their :file:`models.py` in the :const:`INSTALLED_APPS` tuple.
+
+
+.. warning::
+   Signals are not triggered when doing cascading updates / deletes - if this
+   is required you must manually handle the update / delete.
+
+Generic reference fields
+''''''''''''''''''''''''
+A second kind of reference field also exists,
+:class:`~mongoengine.fields.GenericReferenceField`. This allows you to reference any
+kind of :class:`~mongoengine.Document`, and hence doesn't take a
+:class:`~mongoengine.Document` subclass as a constructor argument::
+
+    class Link(Document):
+        url = StringField()
+
+    class Post(Document):
+        title = StringField()
+
+    class Bookmark(Document):
+        bookmark_object = GenericReferenceField()
+
+    link = Link(url='http://hmarr.com/mongoengine/')
+    link.save()
+
+    post = Post(title='Using MongoEngine')
+    post.save()
+
+    Bookmark(bookmark_object=link).save()
+    Bookmark(bookmark_object=post).save()
+
+.. note::
+
+   Using :class:`~mongoengine.fields.GenericReferenceField`\ s is slightly less
+   efficient than the standard :class:`~mongoengine.fields.ReferenceField`\ s, so if
+   you will only be referencing one document type, prefer the standard
+   :class:`~mongoengine.fields.ReferenceField`.
+
 Uniqueness constraints
-^^^^^^^^^^^^^^^^^^^^^^
+----------------------
 MongoEngine allows you to specify that a field should be unique across a
-collection by providing ``unique=True`` to a :class:`~mongoengine.Field`\ 's
+collection by providing ``unique=True`` to a :class:`~mongoengine.fields.Field`\ 's
 constructor. If you try to save a document that has the same value for a unique
 field as a document that is already in the database, a
 :class:`~mongoengine.OperationError` will be raised. You may also specify
@@ -112,7 +396,21 @@ either a single field name, or a list or tuple of field names::
     class User(Document):
         username = StringField(unique=True)
         first_name = StringField()
-        last_name = StringField(unique_with='last_name')
+        last_name = StringField(unique_with='first_name')
+
+Skipping Document validation on save
+------------------------------------
+You can also skip the whole document validation process by setting
+``validate=False`` when calling the :meth:`~mongoengine.document.Document.save`
+method::
+
+    class Recipient(Document):
+        name = StringField()
+        email = EmailField()
+
+    recipient = Recipient(name='admin', email='root@localhost')
+    recipient.save()               # will raise a ValidationError while
+    recipient.save(validate=False) # won't
 
 Document collections
 ====================
@@ -130,7 +428,7 @@ document class to use::
         meta = {'collection': 'cmsPage'}
 
 Capped collections
-^^^^^^^^^^^^^^^^^^
+------------------
 A :class:`~mongoengine.Document` may use a **Capped Collection** by specifying
 :attr:`max_documents` and :attr:`max_size` in the :attr:`meta` dictionary.
 :attr:`max_documents` is the maximum number of documents that is allowed to be
@@ -144,14 +442,18 @@ The following example shows a :class:`Log` document that will be limited to
         ip_address = StringField()
         meta = {'max_documents': 1000, 'max_size': 2000000}
 
+.. defining-indexes_
+
 Indexes
 =======
+
 You can specify indexes on collections to make querying faster. This is done
 by creating a list of index specifications called :attr:`indexes` in the
 :attr:`~mongoengine.Document.meta` dictionary, where an index specification may
-either be a single field name, or a tuple containing multiple field names. A
+either be a single field name, a tuple containing multiple field names, or a
-direction may be specified on fields by prefixing the field name with a **+**
+dictionary containing a full index definition. A direction may be specified on
-or a **-** sign. Note that direction only matters on multi-field indexes. ::
+fields by prefixing the field name with a **+** (for ascending) or a **-** sign
+(for descending). Note that direction only matters on multi-field indexes. ::
 
     class Page(Document):
         title = StringField()
@@ -160,6 +462,146 @@ or a **-** sign. Note that direction only matters on multi-field indexes. ::
             'indexes': ['title', ('title', '-rating')]
         }
 
+If a dictionary is passed then the following options are available:
+
+:attr:`fields` (Default: None)
+    The fields to index. Specified in the same format as described above.
+
+:attr:`cls` (Default: True)
+    If you have polymorphic models that inherit and have
+    :attr:`allow_inheritance` turned on, you can configure whether the index
+    should have the :attr:`_cls` field added automatically to the start of the
+    index.
+
+:attr:`sparse` (Default: False)
+    Whether the index should be sparse.
+
+:attr:`unique` (Default: False)
+    Whether the index should be unique.
+
+:attr:`expireAfterSeconds` (Optional)
+    Allows you to automatically expire data from a collection by setting the
+    time in seconds to expire the a field.
+
+.. note::
+
+    Inheritance adds extra fields indices see: :ref:`document-inheritance`.
+
+Global index default options
+----------------------------
+
+There are a few top level defaults for all indexes that can be set::
+
+    class Page(Document):
+        title = StringField()
+        rating = StringField()
+        meta = {
+            'index_options': {},
+            'index_background': True,
+            'index_drop_dups': True,
+            'index_cls': False
+        }
+
+
+:attr:`index_options` (Optional)
+    Set any default index options - see the `full options list <http://docs.mongodb.org/manual/reference/method/db.collection.ensureIndex/#db.collection.ensureIndex>`_
+
+:attr:`index_background` (Optional)
+    Set the default value for if an index should be indexed in the background
+
+:attr:`index_drop_dups` (Optional)
+    Set the default value for if an index should drop duplicates
+
+:attr:`index_cls` (Optional)
+    A way to turn off a specific index for _cls.
+
+
+Compound Indexes and Indexing sub documents
+-------------------------------------------
+
+Compound indexes can be created by adding the Embedded field or dictionary
+field name to the index definition.
+
+Sometimes its more efficient to index parts of Embedded / dictionary fields,
+in this case use 'dot' notation to identify the value to index eg: `rank.title`
+
+Geospatial indexes
+------------------
+
+The best geo index for mongodb is the new "2dsphere", which has an improved
+spherical model and provides better performance and more options when querying.
+The following fields will explicitly add a "2dsphere" index:
+
+    - :class:`~mongoengine.fields.PointField`
+    - :class:`~mongoengine.fields.LineStringField`
+    - :class:`~mongoengine.fields.PolygonField`
+
+As "2dsphere" indexes can be part of a compound index, you may not want the
+automatic index but would prefer a compound index.  In this example we turn off
+auto indexing and explicitly declare a compound index on ``location`` and ``datetime``::
+
+    class Log(Document):
+        location = PointField(auto_index=False)
+        datetime = DateTimeField()
+
+        meta = {
+            'indexes': [[("location", "2dsphere"), ("datetime", 1)]]
+        }
+
+
+Pre MongoDB 2.4 Geo
+'''''''''''''''''''
+
+.. note:: For MongoDB < 2.4 this is still current, however the new 2dsphere
+    index is a big improvement over the previous 2D model - so upgrading is
+    advised.
+
+Geospatial indexes will be automatically created for all
+:class:`~mongoengine.fields.GeoPointField`\ s
+
+It is also possible to explicitly define geospatial indexes. This is
+useful if you need to define a geospatial index on a subfield of a
+:class:`~mongoengine.fields.DictField` or a custom field that contains a
+point. To create a geospatial index you must prefix the field with the
+***** sign. ::
+
+    class Place(Document):
+        location = DictField()
+        meta = {
+            'indexes': [
+                '*location.point',
+            ],
+        }
+
+Time To Live indexes
+--------------------
+
+A special index type that allows you to automatically expire data from a
+collection after a given period. See the official
+`ttl <http://docs.mongodb.org/manual/tutorial/expire-data/#expire-data-from-collections-by-setting-ttl>`_
+documentation for more information.  A common usecase might be session data::
+
+    class Session(Document):
+        created = DateTimeField(default=datetime.now)
+        meta = {
+            'indexes': [
+                {'fields': ['created'], 'expireAfterSeconds': 3600}
+            ]
+        }
+
+.. warning:: TTL indexes happen on the MongoDB server and not in the application
+    code, therefore no signals will be fired on document deletion.
+    If you need signals to be fired on deletion, then you must handle the
+    deletion of Documents in your application code.
+
+Comparing Indexes
+-----------------
+
+Use :func:`mongoengine.Document.compare_indexes` to compare actual indexes in
+the database to those that your document definitions define.  This is useful
+for maintenance purposes and ensuring you have the correct indexes for your
+schema.
+
 Ordering
 ========
 A default ordering can be specified for your
@@ -179,13 +621,13 @@ subsequent calls to :meth:`~mongoengine.queryset.QuerySet.order_by`. ::
         }
 
     blog_post_1 = BlogPost(title="Blog Post #1")
-    blog_post_1.published_date = datetime(2010, 1, 5, 0, 0 ,0))
+    blog_post_1.published_date = datetime(2010, 1, 5, 0, 0 ,0)
 
     blog_post_2 = BlogPost(title="Blog Post #2")
-    blog_post_2.published_date = datetime(2010, 1, 6, 0, 0 ,0))
+    blog_post_2.published_date = datetime(2010, 1, 6, 0, 0 ,0)
 
     blog_post_3 = BlogPost(title="Blog Post #3")
-    blog_post_3.published_date = datetime(2010, 1, 7, 0, 0 ,0))
+    blog_post_3.published_date = datetime(2010, 1, 7, 0, 0 ,0)
 
     blog_post_1.save()
     blog_post_2.save()
@@ -194,45 +636,97 @@ subsequent calls to :meth:`~mongoengine.queryset.QuerySet.order_by`. ::
     # get the "first" BlogPost using default ordering
     # from BlogPost.meta.ordering
     latest_post = BlogPost.objects.first()
-    self.assertEqual(latest_post.title, "Blog Post #3")
+    assert latest_post.title == "Blog Post #3"
 
     # override default ordering, order BlogPosts by "published_date"
     first_post = BlogPost.objects.order_by("+published_date").first()
-    self.assertEqual(first_post.title, "Blog Post #1")
+    assert first_post.title == "Blog Post #1"
+
+Shard keys
+==========
+
+If your collection is sharded, then you need to specify the shard key as a tuple,
+using the :attr:`shard_key` attribute of :attr:`-mongoengine.Document.meta`.
+This ensures that the shard key is sent with the query when calling the
+:meth:`~mongoengine.document.Document.save` or
+:meth:`~mongoengine.document.Document.update` method on an existing
+:class:`-mongoengine.Document` instance::
+
+    class LogEntry(Document):
+        machine = StringField()
+        app = StringField()
+        timestamp = DateTimeField()
+        data = StringField()
+
+        meta = {
+            'shard_key': ('machine', 'timestamp',)
+        }
+
+.. _document-inheritance:
 
 Document inheritance
 ====================
+
 To create a specialised type of a :class:`~mongoengine.Document` you have
 defined, you may subclass it and add any extra fields or methods you may need.
 As this is new class is not a direct subclass of
 :class:`~mongoengine.Document`, it will not be stored in its own collection; it
 will use the same collection as its superclass uses. This allows for more
-convenient and efficient retrieval of related documents::
+convenient and efficient retrieval of related documents - all you need do is
+set :attr:`allow_inheritance` to True in the :attr:`meta` data for a
+document.::
 
     # Stored in a collection named 'page'
     class Page(Document):
         title = StringField(max_length=200, required=True)
 
+        meta = {'allow_inheritance': True}
+
     # Also stored in the collection named 'page'
     class DatedPage(Page):
         date = DateTimeField()
 
+.. note:: From 0.8 onwards you must declare :attr:`allow_inheritance` defaults
+          to False, meaning you must set it to True to use inheritance.
+
 Working with existing data
-^^^^^^^^^^^^^^^^^^^^^^^^^^
+--------------------------
-To enable correct retrieval of documents involved in this kind of heirarchy,
+As MongoEngine no longer defaults to needing :attr:`_cls` you can quickly and
-two extra attributes are stored on each document in the database: :attr:`_cls`
+easily get working with existing data.  Just define the document to match
-and :attr:`_types`. These are hidden from the user through the MongoEngine
+the expected schema in your database ::
-interface, but may not be present if you are trying to use MongoEngine with 
-an existing database. For this reason, you may disable this inheritance
-mechansim, removing the dependency of :attr:`_cls` and :attr:`_types`, enabling
-you to work with existing databases. To disable inheritance on a document
-class, set :attr:`allow_inheritance` to ``False`` in the :attr:`meta`
-dictionary::
 
     # Will work with data in an existing collection named 'cmsPage'
     class Page(Document):
         title = StringField(max_length=200, required=True)
         meta = {
-            'collection': 'cmsPage',
+            'collection': 'cmsPage'
-            'allow_inheritance': False,
         }
+
+If you have wildly varying schemas then using a
+:class:`~mongoengine.DynamicDocument` might be more appropriate, instead of
+defining all possible field types.
+
+If you use :class:`~mongoengine.Document` and the database contains data that
+isn't defined then that data will be stored in the `document._data` dictionary.
+
+Abstract classes
+================
+
+If you want to add some extra functionality to a group of Document classes but
+you don't need or want the overhead of inheritance you can use the
+:attr:`abstract` attribute of :attr:`-mongoengine.Document.meta`.
+This won't turn on :ref:`document-inheritance` but will allow you to keep your
+code DRY::
+
+        class BaseDocument(Document):
+            meta = {
+                'abstract': True,
+            }
+            def check_permissions(self):
+                ...
+
+        class User(BaseDocument):
+           ...
+
+Now the User class will have access to the inherited `check_permissions` method
+and won't store any of the extra `_cls` information.

docs/guide/document-instances.rst

@@ -17,21 +17,75 @@ attribute syntax::
     'Example Page'
 
 Saving and deleting documents
------------------------------
+=============================
-To save the document to the database, call the
+MongoEngine tracks changes to documents to provide efficient saving.  To save
-:meth:`~mongoengine.Document.save` method. If the document does not exist in
+the document to the database, call the :meth:`~mongoengine.Document.save` method.
-the database, it will be created. If it does already exist, it will be
+If the document does not exist in the database, it will be created. If it does
-updated.
+already exist, then any changes will be updated atomically.  For example::
 
-To delete a document, call the :meth:`~mongoengine.Document.delete` method.
+    >>> page = Page(title="Test Page")
-Note that this will only work if the document exists in the database and has a
+    >>> page.save()  # Performs an insert
-valide :attr:`id`.
+    >>> page.title = "My Page"
+    >>> page.save()  # Performs an atomic set on the title field.
+
+.. note::
+
+    Changes to documents are tracked and on the whole perform ``set`` operations.
+
+    * ``list_field.push(0)`` - *sets* the resulting list
+    * ``del(list_field)``   - *unsets* whole list
+
+    With lists its preferable to use ``Doc.update(push__list_field=0)`` as
+    this stops the whole list being updated - stopping any race conditions.
 
 .. seealso::
     :ref:`guide-atomic-updates`
 
+Pre save data validation and cleaning
+-------------------------------------
+MongoEngine allows you to create custom cleaning rules for your documents when
+calling :meth:`~mongoengine.Document.save`.  By providing a custom
+:meth:`~mongoengine.Document.clean` method you can do any pre validation / data
+cleaning.
+
+This might be useful if you want to ensure a default value based on other
+document values for example::
+
+    class Essay(Document):
+        status = StringField(choices=('Published', 'Draft'), required=True)
+        pub_date = DateTimeField()
+
+        def clean(self):
+            """Ensures that only published essays have a `pub_date` and
+            automatically sets the pub_date if published and not set"""
+            if self.status == 'Draft' and self.pub_date is not None:
+                msg = 'Draft entries should not have a publication date.'
+                raise ValidationError(msg)
+            # Set the pub_date for published items if not set.
+            if self.status == 'Published' and self.pub_date is None:
+                self.pub_date = datetime.now()
+
+.. note::
+    Cleaning is only called if validation is turned on and when calling
+    :meth:`~mongoengine.Document.save`.
+
+Cascading Saves
+---------------
+If your document contains :class:`~mongoengine.fields.ReferenceField` or
+:class:`~mongoengine.fields.GenericReferenceField` objects, then by default the
+:meth:`~mongoengine.Document.save` method will not save any changes to
+those objects.  If you want all references to also be saved also, noting each
+save is a separate query, then passing :attr:`cascade` as True
+to the save method will cascade any saves.
+
+Deleting documents
+------------------
+To delete a document, call the :meth:`~mongoengine.Document.delete` method.
+Note that this will only work if the document exists in the database and has a
+valid :attr:`id`.
+
 Document IDs
-------------
+============
 Each document in the database has a unique id. This may be accessed through the
 :attr:`id` attribute on :class:`~mongoengine.Document` objects. Usually, the id
 will be generated automatically by the database server when the object is save,
@@ -59,7 +113,15 @@ you may still use :attr:`id` to access the primary key if you want::
     >>> bob.id == bob.email == 'bob@example.com'
     True
 
+You can also access the document's "primary key" using the :attr:`pk` field; in
+is an alias to :attr:`id`::
+
+    >>> page = Page(title="Another Test Page")
+    >>> page.save()
+    >>> page.id == page.pk
+
 .. note::
+
    If you define your own primary key field, the field implicitly becomes
-   required, so a :class:`ValidationError` will be thrown if you don't provide
+   required, so a :class:`~mongoengine.ValidationError` will be thrown if
-   it.
+   you don't provide it.

docs/guide/gridfs.rst

@@ -0,0 +1,74 @@
+======
+GridFS
+======
+
+.. versionadded:: 0.4
+
+Writing
+-------
+
+GridFS support comes in the form of the :class:`~mongoengine.fields.FileField` field
+object. This field acts as a file-like object and provides a couple of
+different ways of inserting and retrieving data. Arbitrary metadata such as
+content type can also be stored alongside the files. In the following example,
+a document is created to store details about animals, including a photo::
+
+    class Animal(Document):
+        genus = StringField()
+        family = StringField()
+        photo = FileField()
+
+    marmot = Animal(genus='Marmota', family='Sciuridae')
+
+    marmot_photo = open('marmot.jpg', 'r')
+    marmot.photo.put(marmot_photo, content_type = 'image/jpeg')
+    marmot.save()
+
+Retrieval
+---------
+
+So using the :class:`~mongoengine.fields.FileField` is just like using any other
+field. The file can also be retrieved just as easily::
+
+    marmot = Animal.objects(genus='Marmota').first()
+    photo = marmot.photo.read()
+    content_type = marmot.photo.content_type
+
+Streaming
+---------
+
+Streaming data into a :class:`~mongoengine.fields.FileField` is achieved in a
+slightly different manner.  First, a new file must be created by calling the
+:func:`new_file` method. Data can then be written using :func:`write`::
+
+    marmot.photo.new_file()
+    marmot.photo.write('some_image_data')
+    marmot.photo.write('some_more_image_data')
+    marmot.photo.close()
+
+    marmot.photo.save()
+
+Deletion
+--------
+
+Deleting stored files is achieved with the :func:`delete` method::
+
+    marmot.photo.delete()
+
+.. warning::
+
+    The FileField in a Document actually only stores the ID of a file in a
+    separate GridFS collection. This means that deleting a document
+    with a defined FileField does not actually delete the file. You must be
+    careful to delete any files in a Document as above before deleting the
+    Document itself.
+
+
+Replacing files
+---------------
+
+Files can be replaced with the :func:`replace` method. This works just like
+the :func:`put` method so even metadata can (and should) be replaced::
+
+    another_marmot = open('another_marmot.png', 'r')
+    marmot.photo.replace(another_marmot, content_type='image/png')

docs/guide/index.rst

@@ -10,3 +10,5 @@ User Guide
    defining-documents
    document-instances
    querying
+   gridfs
+   signals

docs/guide/installing.rst

@@ -1,31 +1,31 @@
 ======================
 Installing MongoEngine
 ======================
+
 To use MongoEngine, you will need to download `MongoDB <http://mongodb.org/>`_
 and ensure it is running in an accessible location. You will also need
 `PyMongo <http://api.mongodb.org/python>`_ to use MongoEngine, but if you
 install MongoEngine using setuptools, then the dependencies will be handled for
 you.
 
-MongoEngine is available on PyPI, so to use it you can use 
+MongoEngine is available on PyPI, so to use it you can use :program:`pip`:
-:program:`easy_install`:
 
 .. code-block:: console
 
-    # easy_install mongoengine
+    $ pip install mongoengine
 
 Alternatively, if you don't have setuptools installed, `download it from PyPi
 <http://pypi.python.org/pypi/mongoengine/>`_ and run
 
 .. code-block:: console
 
-    # python setup.py install
+    $ python setup.py install
 
 To use the bleeding-edge version of MongoEngine, you can get the source from
-`GitHub <http://github.com/hmarr/mongoengine/>`_ and install it as above:
+`GitHub <http://github.com/mongoengine/mongoengine/>`_ and install it as above:
 
 .. code-block:: console
 
-    # git clone git://github.com/hmarr/mongoengine
+    $ git clone git://github.com/mongoengine/mongoengine
-    # cd mongoengine
+    $ cd mongoengine
-    # python setup.py install
+    $ python setup.py install

docs/guide/querying.rst

@@ -5,16 +5,23 @@ Querying the database
 is used for accessing the objects in the database associated with the class.
 The :attr:`objects` attribute is actually a
 :class:`~mongoengine.queryset.QuerySetManager`, which creates and returns a new
-a new :class:`~mongoengine.queryset.QuerySet` object on access. The
+:class:`~mongoengine.queryset.QuerySet` object on access. The
-:class:`~mongoengine.queryset.QuerySet` object may may be iterated over to
+:class:`~mongoengine.queryset.QuerySet` object may be iterated over to
 fetch documents from the database::
 
     # Prints out the names of all the users in the database
     for user in User.objects:
         print user.name
 
+.. note::
+
+    As of MongoEngine 0.8 the querysets utilise a local cache.  So iterating
+    it multiple times will only cause a single query.  If this is not the
+    desired behavour you can call :class:`~mongoengine.QuerySet.no_cache`
+    (version **0.8.3+**) to return a non-caching queryset.
+
 Filtering queries
------------------
+=================
 The query may be filtered by calling the
 :class:`~mongoengine.queryset.QuerySet` object with field lookup keyword
 arguments. The keys in the keyword arguments correspond to fields on the
@@ -32,11 +39,135 @@ syntax::
     # been written by a user whose 'country' field is set to 'uk'
     uk_pages = Page.objects(author__country='uk')
 
+
+Query operators
+===============
+Operators other than equality may also be used in queries; just attach the
+operator name to a key with a double-underscore::
+
+    # Only find users whose age is 18 or less
+    young_users = Users.objects(age__lte=18)
+
+Available operators are as follows:
+
+* ``ne`` -- not equal to
+* ``lt`` -- less than
+* ``lte`` -- less than or equal to
+* ``gt`` -- greater than
+* ``gte`` -- greater than or equal to
+* ``not`` -- negate a standard check, may be used before other operators (e.g.
+  ``Q(age__not__mod=5)``)
+* ``in`` -- value is in list (a list of values should be provided)
+* ``nin`` -- value is not in list (a list of values should be provided)
+* ``mod`` -- ``value % x == y``, where ``x`` and ``y`` are two provided values
+* ``all`` -- every item in list of values provided is in array
+* ``size`` -- the size of the array is
+* ``exists`` -- value for field exists
+
+String queries
+--------------
+
+The following operators are available as shortcuts to querying with regular
+expressions:
+
+* ``exact`` -- string field exactly matches value
+* ``iexact`` -- string field exactly matches value (case insensitive)
+* ``contains`` -- string field contains value
+* ``icontains`` -- string field contains value (case insensitive)
+* ``startswith`` -- string field starts with value
+* ``istartswith`` -- string field starts with value (case insensitive)
+* ``endswith`` -- string field ends with value
+* ``iendswith`` -- string field ends with value (case insensitive)
+* ``match``  -- performs an $elemMatch so you can match an entire document within an array
+
+
+Geo queries
+-----------
+
+There are a few special operators for performing geographical queries. The following
+were added in 0.8 for:  :class:`~mongoengine.fields.PointField`,
+:class:`~mongoengine.fields.LineStringField` and
+:class:`~mongoengine.fields.PolygonField`:
+
+* ``geo_within`` -- Check if a geometry is within a polygon.  For ease of use
+    it accepts either a geojson geometry or just the polygon coordinates eg::
+
+        loc.objects(point__geo_with=[[[40, 5], [40, 6], [41, 6], [40, 5]]])
+        loc.objects(point__geo_with={"type": "Polygon",
+                                 "coordinates": [[[40, 5], [40, 6], [41, 6], [40, 5]]]})
+
+* ``geo_within_box`` - simplified geo_within searching with a box eg::
+
+        loc.objects(point__geo_within_box=[(-125.0, 35.0), (-100.0, 40.0)])
+        loc.objects(point__geo_within_box=[<bottom left coordinates>, <upper right coordinates>])
+
+* ``geo_within_polygon`` -- simplified geo_within searching within a simple polygon eg::
+
+        loc.objects(point__geo_within_polygon=[[40, 5], [40, 6], [41, 6], [40, 5]])
+        loc.objects(point__geo_within_polygon=[ [ <x1> , <y1> ] ,
+                                                [ <x2> , <y2> ] ,
+                                                [ <x3> , <y3> ] ])
+
+* ``geo_within_center`` -- simplified geo_within the flat circle radius of a point eg::
+
+        loc.objects(point__geo_within_center=[(-125.0, 35.0), 1])
+        loc.objects(point__geo_within_center=[ [ <x>, <y> ] , <radius> ])
+
+* ``geo_within_sphere`` -- simplified geo_within the spherical circle radius of a point eg::
+
+        loc.objects(point__geo_within_sphere=[(-125.0, 35.0), 1])
+        loc.objects(point__geo_within_sphere=[ [ <x>, <y> ] , <radius> ])
+
+* ``geo_intersects`` -- selects all locations that intersect with a geometry eg::
+
+        # Inferred from provided points lists:
+        loc.objects(poly__geo_intersects=[40, 6])
+        loc.objects(poly__geo_intersects=[[40, 5], [40, 6]])
+        loc.objects(poly__geo_intersects=[[[40, 5], [40, 6], [41, 6], [41, 5], [40, 5]]])
+
+        # With geoJson style objects
+        loc.objects(poly__geo_intersects={"type": "Point", "coordinates": [40, 6]})
+        loc.objects(poly__geo_intersects={"type": "LineString",
+                                          "coordinates": [[40, 5], [40, 6]]})
+        loc.objects(poly__geo_intersects={"type": "Polygon",
+                                          "coordinates": [[[40, 5], [40, 6], [41, 6], [41, 5], [40, 5]]]})
+
+* ``near`` -- Find all the locations near a given point::
+
+        loc.objects(point__near=[40, 5])
+        loc.objects(point__near={"type": "Point", "coordinates": [40, 5]})
+
+
+    You can also set the maximum distance in meters as well::
+
+        loc.objects(point__near=[40, 5], point__max_distance=1000)
+
+
+The older 2D indexes are still supported with the
+:class:`~mongoengine.fields.GeoPointField`:
+
+* ``within_distance`` -- provide a list containing a point and a maximum
+  distance (e.g. [(41.342, -87.653), 5])
+* ``within_spherical_distance`` -- Same as above but using the spherical geo model
+  (e.g. [(41.342, -87.653), 5/earth_radius])
+* ``near`` -- order the documents by how close they are to a given point
+* ``near_sphere`` -- Same as above but using the spherical geo model
+* ``within_box`` -- filter documents to those within a given bounding box (e.g.
+  [(35.0, -125.0), (40.0, -100.0)])
+* ``within_polygon`` -- filter documents to those within a given polygon (e.g.
+  [(41.91,-87.69), (41.92,-87.68), (41.91,-87.65), (41.89,-87.65)]).
+
+  .. note:: Requires Mongo Server 2.0
+
+* ``max_distance`` -- can be added to your location queries to set a maximum
+  distance.
+
+
 Querying lists
-^^^^^^^^^^^^^^
+--------------
 On most fields, this syntax will look up documents where the field specified
 matches the given value exactly, but when the field refers to a
-:class:`~mongoengine.ListField`, a single item may be provided, in which case
+:class:`~mongoengine.fields.ListField`, a single item may be provided, in which case
 lists that contain that item will be matched::
 
     class Page(Document):
@@ -46,30 +177,42 @@ lists that contain that item will be matched::
     # 'tags' list
     Page.objects(tags='coding')
 
-Query operators
+It is possible to query by position in a list by using a numerical value as a
----------------
+query operator. So if you wanted to find all pages whose first tag was ``db``,
-Operators other than equality may also be used in queries; just attach the
+you could use the following query::
-operator name to a key with a double-underscore::
 
-    # Only find users whose age is 18 or less
+    Page.objects(tags__0='db')
-    young_users = Users.objects(age__lte=18)
 
-Available operators are as follows:
+If you only want to fetch part of a list eg: you want to paginate a list, then
+the `slice` operator is required::
 
-* ``neq`` -- not equal to
+    # comments - skip 5, limit 10
-* ``lt`` -- less than
+    Page.objects.fields(slice__comments=[5, 10])
-* ``lte`` -- less than or equal to
+
-* ``gt`` -- greater than
+For updating documents, if you don't know the position in a list, you can use
-* ``gte`` -- greater than or equal to
+the $ positional operator ::
-* ``in`` -- value is in list (a list of values should be provided)
+
-* ``nin`` -- value is not in list (a list of values should be provided)
+    Post.objects(comments__by="joe").update(**{'inc__comments__$__votes': 1})
-* ``mod`` -- ``value % x == y``, where ``x`` and ``y`` are two provided values
+
-* ``all`` -- every item in array is in list of values provided
+However, this doesn't map well to the syntax so you can also use a capital S instead ::
-* ``size`` -- the size of the array is 
+
-* ``exists`` -- value for field exists
+    Post.objects(comments__by="joe").update(inc__comments__S__votes=1)
+
+    .. note:: Due to Mongo currently the $ operator only applies to the first matched item in the query.
+
+
+Raw queries
+-----------
+It is possible to provide a raw PyMongo query as a query parameter, which will
+be integrated directly into the query. This is done using the ``__raw__``
+keyword argument::
+
+    Page.objects(__raw__={'tags': 'coding'})
+
+.. versionadded:: 0.4
 
 Limiting and skipping results
------------------------------
+=============================
 Just as with traditional ORMs, you may limit the number of results returned, or
 skip a number or results in you query.
 :meth:`~mongoengine.queryset.QuerySet.limit` and
@@ -86,15 +229,112 @@ achieving this is using array-slicing syntax::
     # 5 users, starting from the 10th user found
     users = User.objects[10:15]
 
+You may also index the query to retrieve a single result. If an item at that
+index does not exists, an :class:`IndexError` will be raised. A shortcut for
+retrieving the first result and returning :attr:`None` if no result exists is
+provided (:meth:`~mongoengine.queryset.QuerySet.first`)::
+
+    >>> # Make sure there are no users
+    >>> User.drop_collection()
+    >>> User.objects[0]
+    IndexError: list index out of range
+    >>> User.objects.first() == None
+    True
+    >>> User(name='Test User').save()
+    >>> User.objects[0] == User.objects.first()
+    True
+
+Retrieving unique results
+-------------------------
+To retrieve a result that should be unique in the collection, use
+:meth:`~mongoengine.queryset.QuerySet.get`. This will raise
+:class:`~mongoengine.queryset.DoesNotExist` if
+no document matches the query, and
+:class:`~mongoengine.queryset.MultipleObjectsReturned`
+if more than one document matched the query.  These exceptions are merged into
+your document defintions eg: `MyDoc.DoesNotExist`
+
+A variation of this method exists,
+:meth:`~mongoengine.queryset.Queryset.get_or_create`, that will create a new
+document with the query arguments if no documents match the query. An
+additional keyword argument, :attr:`defaults` may be provided, which will be
+used as default values for the new document, in the case that it should need
+to be created::
+
+    >>> a, created = User.objects.get_or_create(name='User A', defaults={'age': 30})
+    >>> b, created = User.objects.get_or_create(name='User A', defaults={'age': 40})
+    >>> a.name == b.name and a.age == b.age
+    True
+
+Default Document queries
+========================
+By default, the objects :attr:`~mongoengine.Document.objects` attribute on a
+document returns a :class:`~mongoengine.queryset.QuerySet` that doesn't filter
+the collection -- it returns all objects. This may be changed by defining a
+method on a document that modifies a queryset. The method should accept two
+arguments -- :attr:`doc_cls` and :attr:`queryset`. The first argument is the
+:class:`~mongoengine.Document` class that the method is defined on (in this
+sense, the method is more like a :func:`classmethod` than a regular method),
+and the second argument is the initial queryset. The method needs to be
+decorated with :func:`~mongoengine.queryset.queryset_manager` in order for it
+to be recognised. ::
+
+    class BlogPost(Document):
+        title = StringField()
+        date = DateTimeField()
+
+        @queryset_manager
+        def objects(doc_cls, queryset):
+            # This may actually also be done by defining a default ordering for
+            # the document, but this illustrates the use of manager methods
+            return queryset.order_by('-date')
+
+You don't need to call your method :attr:`objects` -- you may define as many
+custom manager methods as you like::
+
+    class BlogPost(Document):
+        title = StringField()
+        published = BooleanField()
+
+        @queryset_manager
+        def live_posts(doc_cls, queryset):
+            return queryset.filter(published=True)
+
+    BlogPost(title='test1', published=False).save()
+    BlogPost(title='test2', published=True).save()
+    assert len(BlogPost.objects) == 2
+    assert len(BlogPost.live_posts()) == 1
+
+Custom QuerySets
+================
+Should you want to add custom methods for interacting with or filtering
+documents, extending the :class:`~mongoengine.queryset.QuerySet` class may be
+the way to go. To use a custom :class:`~mongoengine.queryset.QuerySet` class on
+a document, set ``queryset_class`` to the custom class in a
+:class:`~mongoengine.Document`\ s ``meta`` dictionary::
+
+    class AwesomerQuerySet(QuerySet):
+
+        def get_awesome(self):
+            return self.filter(awesome=True)
+
+    class Page(Document):
+        meta = {'queryset_class': AwesomerQuerySet}
+
+    # To call:
+    Page.objects.get_awesome()
+
+.. versionadded:: 0.4
+
 Aggregation
------------
+===========
 MongoDB provides some aggregation methods out of the box, but there are not as
 many as you typically get with an RDBMS. MongoEngine provides a wrapper around
 the built-in methods and provides some of its own, which are implemented as
 Javascript code that is executed on the database server.
 
 Counting results
-^^^^^^^^^^^^^^^^
+----------------
 Just as with limiting and skipping results, there is a method on
 :class:`~mongoengine.queryset.QuerySet` objects --
 :meth:`~mongoengine.queryset.QuerySet.count`, but there is also a more Pythonic
@@ -103,13 +343,14 @@ way of achieving this::
     num_users = len(User.objects)
 
 Further aggregation
-^^^^^^^^^^^^^^^^^^^
+-------------------
 You may sum over the values of a specific field on documents using
 :meth:`~mongoengine.queryset.QuerySet.sum`::
 
     yearly_expense = Employee.objects.sum('salary')
 
 .. note::
+
    If the field isn't present on a document, that document will be ignored from
    the sum.
 
@@ -132,8 +373,93 @@ would be generating "tag-clouds"::
     from operator import itemgetter
     top_tags = sorted(tag_freqs.items(), key=itemgetter(1), reverse=True)[:10]
 
+
+Query efficiency and performance
+================================
+
+There are a couple of methods to improve efficiency when querying, reducing the
+information returned by the query or efficient dereferencing .
+
+Retrieving a subset of fields
+-----------------------------
+
+Sometimes a subset of fields on a :class:`~mongoengine.Document` is required,
+and for efficiency only these should be retrieved from the database. This issue
+is especially important for MongoDB, as fields may often be extremely large
+(e.g. a :class:`~mongoengine.fields.ListField` of
+:class:`~mongoengine.EmbeddedDocument`\ s, which represent the comments on a
+blog post. To select only a subset of fields, use
+:meth:`~mongoengine.queryset.QuerySet.only`, specifying the fields you want to
+retrieve as its arguments. Note that if fields that are not downloaded are
+accessed, their default value (or :attr:`None` if no default value is provided)
+will be given::
+
+    >>> class Film(Document):
+    ...     title = StringField()
+    ...     year = IntField()
+    ...     rating = IntField(default=3)
+    ...
+    >>> Film(title='The Shawshank Redemption', year=1994, rating=5).save()
+    >>> f = Film.objects.only('title').first()
+    >>> f.title
+    'The Shawshank Redemption'
+    >>> f.year   # None
+    >>> f.rating # default value
+    3
+
+.. note::
+
+    The :meth:`~mongoengine.queryset.QuerySet.exclude` is the opposite of
+    :meth:`~mongoengine.queryset.QuerySet.only` if you want to exclude a field.
+
+If you later need the missing fields, just call
+:meth:`~mongoengine.Document.reload` on your document.
+
+Getting related data
+--------------------
+
+When iterating the results of :class:`~mongoengine.fields.ListField` or
+:class:`~mongoengine.fields.DictField` we automatically dereference any
+:class:`~pymongo.dbref.DBRef` objects as efficiently as possible, reducing the
+number the queries to mongo.
+
+There are times when that efficiency is not enough, documents that have
+:class:`~mongoengine.fields.ReferenceField` objects or
+:class:`~mongoengine.fields.GenericReferenceField` objects at the top level are
+expensive as the number of queries to MongoDB can quickly rise.
+
+To limit the number of queries use
+:func:`~mongoengine.queryset.QuerySet.select_related` which converts the
+QuerySet to a list and dereferences as efficiently as possible.  By default
+:func:`~mongoengine.queryset.QuerySet.select_related` only dereferences any
+references to the depth of 1 level.  If you have more complicated documents and
+want to dereference more of the object at once then increasing the :attr:`max_depth`
+will dereference more levels of the document.
+
+Turning off dereferencing
+-------------------------
+
+Sometimes for performance reasons you don't want to automatically dereference
+data. To turn off dereferencing of the results of a query use
+:func:`~mongoengine.queryset.QuerySet.no_dereference` on the queryset like so::
+
+    post = Post.objects.no_dereference().first()
+    assert(isinstance(post.author, ObjectId))
+
+You can also turn off all dereferencing for a fixed period by using the
+:class:`~mongoengine.context_managers.no_dereference` context manager::
+
+    with no_dereference(Post) as Post:
+        post = Post.objects.first()
+        assert(isinstance(post.author, ObjectId))
+
+    # Outside the context manager dereferencing occurs.
+    assert(isinstance(post.author, User))
+
+
 Advanced queries
-----------------
+================
+
 Sometimes calling a :class:`~mongoengine.queryset.QuerySet` object with keyword
 arguments can't fully express the query you want to use -- for example if you
 need to combine a number of constraints using *and* and *or*. This is made
@@ -142,8 +468,8 @@ A :class:`~mongoengine.queryset.Q` object represents part of a query, and
 can be initialised using the same keyword-argument syntax you use to query
 documents. To build a complex query, you may combine
 :class:`~mongoengine.queryset.Q` objects using the ``&`` (and) and ``|`` (or)
-operators. To use :class:`~mongoengine.queryset.Q` objects, pass them in
+operators. To use a :class:`~mongoengine.queryset.Q` object, pass it in as the
-as positional arguments to :attr:`Document.objects` when you filter it by
+first positional argument to :attr:`Document.objects` when you filter it by
 calling it with keyword arguments::
 
     # Get published posts
@@ -152,16 +478,15 @@ calling it with keyword arguments::
     # Get top posts
     Post.objects((Q(featured=True) & Q(hits__gte=1000)) | Q(hits__gte=5000))
 
-.. warning::
+.. warning:: You have to use bitwise operators.  You cannot use ``or``, ``and``
-   Only use these advanced queries if absolutely necessary as they will execute
+    to combine queries as ``Q(a=a) or Q(b=b)`` is not the same as
-   significantly slower than regular queries. This is because they are not
+    ``Q(a=a) | Q(b=b)``. As ``Q(a=a)`` equates to true ``Q(a=a) or Q(b=b)`` is
-   natively supported by MongoDB -- they are compiled to Javascript and sent
+    the same as ``Q(a=a)``.
-   to the server for execution.
 
 .. _guide-atomic-updates:
 
 Atomic updates
---------------
+==============
 Documents may be updated atomically by using the
 :meth:`~mongoengine.queryset.QuerySet.update_one` and
 :meth:`~mongoengine.queryset.QuerySet.update` methods on a
@@ -174,8 +499,10 @@ that you may use with these methods:
 * ``dec`` -- decrement a value by a given amount
 * ``push`` -- append a value to a list
 * ``push_all`` -- append several values to a list
+* ``pop`` -- remove the first or last element of a list
 * ``pull`` -- remove a value from a list
 * ``pull_all`` -- remove several values from a list
+* ``add_to_set`` -- add value to a list only if its not in the list already
 
 The syntax for atomic updates is similar to the querying syntax, but the
 modifier comes before the field, not after it::
@@ -194,3 +521,127 @@ modifier comes before the field, not after it::
     >>> post.reload()
     >>> post.tags
     ['database', 'nosql']
+
+.. note::
+
+    In version 0.5 the :meth:`~mongoengine.Document.save` runs atomic updates
+    on changed documents by tracking changes to that document.
+
+The positional operator allows you to update list items without knowing the
+index position, therefore making the update a single atomic operation.  As we
+cannot use the `$` syntax in keyword arguments it has been mapped to `S`::
+
+    >>> post = BlogPost(title='Test', page_views=0, tags=['database', 'mongo'])
+    >>> post.save()
+    >>> BlogPost.objects(id=post.id, tags='mongo').update(set__tags__S='mongodb')
+    >>> post.reload()
+    >>> post.tags
+    ['database', 'mongodb']
+
+.. note::
+    Currently only top level lists are handled, future versions of mongodb /
+    pymongo plan to support nested positional operators.  See `The $ positional
+    operator <http://www.mongodb.org/display/DOCS/Updating#Updating-The%24positionaloperator>`_.
+
+Server-side javascript execution
+================================
+Javascript functions may be written and sent to the server for execution. The
+result of this is the return value of the Javascript function. This
+functionality is accessed through the
+:meth:`~mongoengine.queryset.QuerySet.exec_js` method on
+:meth:`~mongoengine.queryset.QuerySet` objects. Pass in a string containing a
+Javascript function as the first argument.
+
+The remaining positional arguments are names of fields that will be passed into
+you Javascript function as its arguments. This allows functions to be written
+that may be executed on any field in a collection (e.g. the
+:meth:`~mongoengine.queryset.QuerySet.sum` method, which accepts the name of
+the field to sum over as its argument). Note that field names passed in in this
+manner are automatically translated to the names used on the database (set
+using the :attr:`name` keyword argument to a field constructor).
+
+Keyword arguments to :meth:`~mongoengine.queryset.QuerySet.exec_js` are
+combined into an object called :attr:`options`, which is available in the
+Javascript function. This may be used for defining specific parameters for your
+function.
+
+Some variables are made available in the scope of the Javascript function:
+
+* ``collection`` -- the name of the collection that corresponds to the
+  :class:`~mongoengine.Document` class that is being used; this should be
+  used to get the :class:`Collection` object from :attr:`db` in Javascript
+  code
+* ``query`` -- the query that has been generated by the
+  :class:`~mongoengine.queryset.QuerySet` object; this may be passed into
+  the :meth:`find` method on a :class:`Collection` object in the Javascript
+  function
+* ``options`` -- an object containing the keyword arguments passed into
+  :meth:`~mongoengine.queryset.QuerySet.exec_js`
+
+The following example demonstrates the intended usage of
+:meth:`~mongoengine.queryset.QuerySet.exec_js` by defining a function that sums
+over a field on a document (this functionality is already available throught
+:meth:`~mongoengine.queryset.QuerySet.sum` but is shown here for sake of
+example)::
+
+    def sum_field(document, field_name, include_negatives=True):
+        code = """
+        function(sumField) {
+            var total = 0.0;
+            db[collection].find(query).forEach(function(doc) {
+                var val = doc[sumField];
+                if (val >= 0.0 || options.includeNegatives) {
+                    total += val;
+                }
+            });
+            return total;
+        }
+        """
+        options = {'includeNegatives': include_negatives}
+        return document.objects.exec_js(code, field_name, **options)
+
+As fields in MongoEngine may use different names in the database (set using the
+:attr:`db_field` keyword argument to a :class:`Field` constructor), a mechanism
+exists for replacing MongoEngine field names with the database field names in
+Javascript code. When accessing a field on a collection object, use
+square-bracket notation, and prefix the MongoEngine field name with a tilde.
+The field name that follows the tilde will be translated to the name used in
+the database. Note that when referring to fields on embedded documents,
+the name of the :class:`~mongoengine.fields.EmbeddedDocumentField`, followed by a dot,
+should be used before the name of the field on the embedded document. The
+following example shows how the substitutions are made::
+
+    class Comment(EmbeddedDocument):
+        content = StringField(db_field='body')
+
+    class BlogPost(Document):
+        title = StringField(db_field='doctitle')
+        comments = ListField(EmbeddedDocumentField(Comment), name='cs')
+
+    # Returns a list of dictionaries. Each dictionary contains a value named
+    # "document", which corresponds to the "title" field on a BlogPost, and
+    # "comment", which corresponds to an individual comment. The substitutions
+    # made are shown in the comments.
+    BlogPost.objects.exec_js("""
+    function() {
+        var comments = [];
+        db[collection].find(query).forEach(function(doc) {
+            // doc[~comments] -> doc["cs"]
+            var docComments = doc[~comments];
+
+            for (var i = 0; i < docComments.length; i++) {
+                // doc[~comments][i] -> doc["cs"][i]
+                var comment = doc[~comments][i];
+
+                comments.push({
+                    // doc[~title] -> doc["doctitle"]
+                    'document': doc[~title],
+
+                    // comment[~comments.content] -> comment["body"]
+                    'comment': comment[~comments.content]
+                });
+            }
+        });
+        return comments;
+    }
+    """)

docs/guide/signals.rst

@@ -0,0 +1,152 @@
+.. _signals:
+
+=======
+Signals
+=======
+
+.. versionadded:: 0.5
+
+.. note::
+
+  Signal support is provided by the excellent `blinker`_ library. If you wish
+  to enable signal support this library must be installed, though it is not
+  required for MongoEngine to function.
+
+Overview
+--------
+
+Signals are found within the `mongoengine.signals` module.  Unless
+specified signals receive no additional arguments beyond the `sender` class and
+`document` instance.  Post-signals are only called if there were no exceptions
+raised during the processing of their related function.
+
+Available signals include:
+
+`pre_init`
+  Called during the creation of a new :class:`~mongoengine.Document` or
+  :class:`~mongoengine.EmbeddedDocument` instance, after the constructor
+  arguments have been collected but before any additional processing has been
+  done to them.  (I.e. assignment of default values.)  Handlers for this signal
+  are passed the dictionary of arguments using the `values` keyword argument
+  and may modify this dictionary prior to returning.
+
+`post_init`
+  Called after all processing of a new :class:`~mongoengine.Document` or
+  :class:`~mongoengine.EmbeddedDocument` instance has been completed.
+
+`pre_save`
+  Called within :meth:`~mongoengine.document.Document.save` prior to performing
+  any actions.
+
+`pre_save_post_validation`
+  Called within :meth:`~mongoengine.document.Document.save` after validation
+  has taken place but before saving.
+
+`post_save`
+  Called within :meth:`~mongoengine.document.Document.save` after all actions
+  (validation, insert/update, cascades, clearing dirty flags) have completed
+  successfully.  Passed the additional boolean keyword argument `created` to
+  indicate if the save was an insert or an update.
+
+`pre_delete`
+  Called within :meth:`~mongoengine.document.Document.delete` prior to
+  attempting the delete operation.
+
+`post_delete`
+  Called within :meth:`~mongoengine.document.Document.delete` upon successful
+  deletion of the record.
+
+`pre_bulk_insert`
+  Called after validation of the documents to insert, but prior to any data
+  being written. In this case, the `document` argument is replaced by a
+  `documents` argument representing the list of documents being inserted.
+
+`post_bulk_insert`
+  Called after a successful bulk insert operation.  As per `pre_bulk_insert`,
+  the `document` argument is omitted and replaced with a `documents` argument.
+  An additional boolean argument, `loaded`, identifies the contents of
+  `documents` as either :class:`~mongoengine.Document` instances when `True` or
+  simply a list of primary key values for the inserted records if `False`.
+
+Attaching Events
+----------------
+
+After writing a handler function like the following::
+
+    import logging
+    from datetime import datetime
+
+    from mongoengine import *
+    from mongoengine import signals
+
+    def update_modified(sender, document):
+        document.modified = datetime.utcnow()
+
+You attach the event handler to your :class:`~mongoengine.Document` or
+:class:`~mongoengine.EmbeddedDocument` subclass::
+
+    class Record(Document):
+        modified = DateTimeField()
+
+    signals.pre_save.connect(update_modified)
+
+While this is not the most elaborate document model, it does demonstrate the
+concepts involved.  As a more complete demonstration you can also define your
+handlers within your subclass::
+
+    class Author(Document):
+        name = StringField()
+
+        @classmethod
+        def pre_save(cls, sender, document, **kwargs):
+            logging.debug("Pre Save: %s" % document.name)
+
+        @classmethod
+        def post_save(cls, sender, document, **kwargs):
+            logging.debug("Post Save: %s" % document.name)
+            if 'created' in kwargs:
+                if kwargs['created']:
+                    logging.debug("Created")
+                else:
+                    logging.debug("Updated")
+
+    signals.pre_save.connect(Author.pre_save, sender=Author)
+    signals.post_save.connect(Author.post_save, sender=Author)
+
+Finally, you can also use this small decorator to quickly create a number of
+signals and attach them to your :class:`~mongoengine.Document` or
+:class:`~mongoengine.EmbeddedDocument` subclasses as class decorators::
+
+    def handler(event):
+        """Signal decorator to allow use of callback functions as class decorators."""
+
+        def decorator(fn):
+            def apply(cls):
+                event.connect(fn, sender=cls)
+                return cls
+
+            fn.apply = apply
+            return fn
+
+        return decorator
+
+Using the first example of updating a modification time the code is now much
+cleaner looking while still allowing manual execution of the callback::
+
+    @handler(signals.pre_save)
+    def update_modified(sender, document):
+        document.modified = datetime.utcnow()
+
+    @update_modified.apply
+    class Record(Document):
+        modified = DateTimeField()
+
+
+ReferenceFields and Signals
+---------------------------
+
+Currently `reverse_delete_rules` do not trigger signals on the other part of
+the relationship.  If this is required you must manually handle the
+reverse deletion.
+
+.. _blinker: http://pypi.python.org/pypi/blinker

docs/index.rst

@@ -2,27 +2,83 @@
 MongoEngine User Documentation
 ==============================
 
-MongoEngine is an Object-Document Mapper, written in Python for working with 
+**MongoEngine** is an Object-Document Mapper, written in Python for working with
 MongoDB. To install it, simply run
 
 .. code-block:: console
 
-    # easy_install mongoengine
+    $ pip install -U mongoengine
+
+:doc:`tutorial`
+  A quick tutorial building a tumblelog to get you up and running with
+  MongoEngine.
+
+:doc:`guide/index`
+  The Full guide to MongoEngine - from modeling documents to storing files,
+  from querying for data to firing signals and *everything* between.
+
+:doc:`apireference`
+  The complete API documentation --- the innards of documents, querysets and fields.
+
+:doc:`upgrade`
+  How to upgrade MongoEngine.
+
+:doc:`django`
+  Using MongoEngine and Django
+
+Community
+---------
+
+To get help with using MongoEngine, use the `MongoEngine Users mailing list
+<http://groups.google.com/group/mongoengine-users>`_ or the ever popular
+`stackoverflow <http://www.stackoverflow.com>`_.
+
+Contributing
+------------
+
+**Yes please!**  We are always looking for contributions, additions and improvements.
+
+The source is available on `GitHub <http://github.com/MongoEngine/mongoengine>`_
+and contributions are always encouraged. Contributions can be as simple as
+minor tweaks to this documentation, the website or the core.
+
+To contribute, fork the project on
+`GitHub <http://github.com/MongoEngine/mongoengine>`_ and send a
+pull request.
+
+Changes
+-------
+
+See the :doc:`changelog` for a full list of changes to MongoEngine and
+:doc:`upgrade` for upgrade information.
+
+.. note::  Always read and test the `upgrade <upgrade>`_ documentation before
+    putting updates live in production **;)**
+
+Offline Reading
+---------------
+
+Download the docs in `pdf <https://media.readthedocs.org/pdf/mongoengine-odm/latest/mongoengine-odm.pdf>`_
+or `epub <https://media.readthedocs.org/epub/mongoengine-odm/latest/mongoengine-odm.epub>`_
+formats for offline reading.
 
-The source is available on `GitHub <http://github.com/hmarr/mongoengine>`_.
 
 .. toctree::
-   :maxdepth: 2
+    :maxdepth: 1
+    :numbered:
+    :hidden:
 
-   tutorial
+    tutorial
-   guide/index
+    guide/index
-   apireference
+    apireference
-   django
+    changelog
-   changelog
+    upgrade
+    django
 
 Indices and tables
-==================
+------------------
 
 * :ref:`genindex`
+* :ref:`modindex`
 * :ref:`search`
 

docs/tutorial.rst

@@ -1,6 +1,7 @@
 ========
 Tutorial
 ========
+
 This tutorial introduces **MongoEngine** by means of example --- we will walk
 through how to create a simple **Tumblelog** application. A Tumblelog is a type
 of blog where posts are not constrained to being conventional text-based posts.
@@ -12,23 +13,29 @@ interface.
 
 Getting started
 ===============
+
 Before we start, make sure that a copy of MongoDB is running in an accessible
 location --- running it locally will be easier, but if that is not an option
-then it may be run on a remote server.
+then it may be run on a remote server. If you haven't installed mongoengine,
+simply use pip to install it like so::
+
+    $ pip install mongoengine
 
 Before we can start using MongoEngine, we need to tell it how to connect to our
 instance of :program:`mongod`. For this we use the :func:`~mongoengine.connect`
-function. The only argument we need to provide is the name of the MongoDB
+function. If running locally the only argument we need to provide is the name
-database to use::
+of the MongoDB database to use::
 
     from mongoengine import *
 
     connect('tumblelog')
 
-For more information about connecting to MongoDB see :ref:`guide-connecting`.
+There are lots of options for connecting to MongoDB, for more information about
+them see the :ref:`guide-connecting` guide.
 
 Defining our documents
 ======================
+
 MongoDB is *schemaless*, which means that no schema is enforced by the database
 --- we may add and remove fields however we want and MongoDB won't complain.
 This makes life a lot easier in many regards, especially when there is a change
@@ -39,17 +46,19 @@ define utility methods on our documents in the same way that traditional
 
 In our Tumblelog application we need to store several different types of
 information.  We will need to have a collection of **users**, so that we may
-link posts to an individual. We also need to store our different types
+link posts to an individual. We also need to store our different types of
-**posts** (text, image and link) in the database. To aid navigation of our
+**posts** (eg: text, image and link) in the database. To aid navigation of our
 Tumblelog, posts may have **tags** associated with them, so that the list of
 posts shown to the user may be limited to posts that have been assigned a
-specified tag.  Finally, it would be nice if **comments** could be added to
+specific tag.  Finally, it would be nice if **comments** could be added to
-posts. We'll start with **users**, as the others are slightly more involved.
+posts. We'll start with **users**, as the other document models are slightly
+more involved.
 
 Users
 -----
+
 Just as if we were using a relational database with an ORM, we need to define
-which fields a :class:`User` may have, and what their types will be::
+which fields a :class:`User` may have, and what types of data they might store::
 
     class User(Document):
         email = StringField(required=True)
@@ -58,11 +67,13 @@ which fields a :class:`User` may have, and what their types will be::
 
 This looks similar to how a the structure of a table would be defined in a
 regular ORM. The key difference is that this schema will never be passed on to
-MongoDB --- this will only be enforced at the application level. Also, the User
+MongoDB --- this will only be enforced at the application level, making future
-documents will be stored in a MongoDB *collection* rather than a table.
+changes easy to manage. Also, the User documents will be stored in a
+MongoDB *collection* rather than a table.
 
 Posts, Comments and Tags
 ------------------------
+
 Now we'll think about how to store the rest of the information. If we were
 using a relational database, we would most likely have a table of **posts**, a
 table of **comments** and a table of **tags**.  To associate the comments with
@@ -75,21 +86,25 @@ of them stand out as particularly intuitive solutions.
 
 Posts
 ^^^^^
-But MongoDB *isn't* a relational database, so we're not going to do it that
+
+Happily mongoDB *isn't* a relational database, so we're not going to do it that
 way. As it turns out, we can use MongoDB's schemaless nature to provide us with
-a much nicer solution. We will store all of the posts in *one collection* ---
+a much nicer solution. We will store all of the posts in *one collection* and
-each post type will just have the fields it needs. If we later want to add
+each post type will only store the fields it needs. If we later want to add
 video posts, we don't have to modify the collection at all, we just *start
 using* the new fields we need to support video posts. This fits with the
 Object-Oriented principle of *inheritance* nicely. We can think of
 :class:`Post` as a base class, and :class:`TextPost`, :class:`ImagePost` and
 :class:`LinkPost` as subclasses of :class:`Post`. In fact, MongoEngine supports
-this kind of modelling out of the box::
+this kind of modelling out of the box --- all you need do is turn on inheritance
+by setting :attr:`allow_inheritance` to True in the :attr:`meta`::
 
     class Post(Document):
         title = StringField(max_length=120, required=True)
         author = ReferenceField(User)
 
+        meta = {'allow_inheritance': True}
+
     class TextPost(Post):
         content = StringField()
 
@@ -100,12 +115,13 @@ this kind of modelling out of the box::
         link_url = StringField()
 
 We are storing a reference to the author of the posts using a
-:class:`~mongoengine.ReferenceField` object. These are similar to foreign key
+:class:`~mongoengine.fields.ReferenceField` object. These are similar to foreign key
 fields in traditional ORMs, and are automatically translated into references
 when they are saved, and dereferenced when they are loaded.
 
 Tags
 ^^^^
+
 Now that we have our Post models figured out, how will we attach tags to them?
 MongoDB allows us to store lists of items natively, so rather than having a
 link table, we can just store a list of tags in each post. So, for both
@@ -121,13 +137,16 @@ size of our database. So let's take a look that the code our modified
         author = ReferenceField(User)
         tags = ListField(StringField(max_length=30))
 
-The :class:`~mongoengine.ListField` object that is used to define a Post's tags
+The :class:`~mongoengine.fields.ListField` object that is used to define a Post's tags
 takes a field object as its first argument --- this means that you can have
-lists of any type of field (including lists). Note that we don't need to
+lists of any type of field (including lists).
-modify the specialised post types as they all inherit from :class:`Post`.
+
+.. note:: We don't need to modify the specialised post types as they all
+    inherit from :class:`Post`.
 
 Comments
 ^^^^^^^^
+
 A comment is typically associated with *one* post. In a relational database, to
 display a post with its comments, we would have to retrieve the post from the
 database, then query the database again for the comments associated with the
@@ -152,21 +171,41 @@ We can then store a list of comment documents in our post document::
         tags = ListField(StringField(max_length=30))
         comments = ListField(EmbeddedDocumentField(Comment))
 
+Handling deletions of references
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The :class:`~mongoengine.fields.ReferenceField` object takes a keyword
+`reverse_delete_rule` for handling deletion rules if the reference is deleted.
+To delete all the posts if a user is deleted set the rule::
+
+    class Post(Document):
+        title = StringField(max_length=120, required=True)
+        author = ReferenceField(User, reverse_delete_rule=CASCADE)
+        tags = ListField(StringField(max_length=30))
+        comments = ListField(EmbeddedDocumentField(Comment))
+
+See :class:`~mongoengine.fields.ReferenceField` for more information.
+
+.. note::
+    MapFields and DictFields currently don't support automatic handling of
+    deleted references
+
+
 Adding data to our Tumblelog
 ============================
 Now that we've defined how our documents will be structured, let's start adding
 some documents to the database. Firstly, we'll need to create a :class:`User`
 object::
 
-    john = User(email='jdoe@example.com', first_name='John', last_name='Doe')
+    ross = User(email='ross@example.com', first_name='Ross', last_name='Lawley').save()
-    john.save()
 
-Note that we could have also defined our user using attribute syntax::
+.. note::
+    We could have also defined our user using attribute syntax::
 
-    john = User(email='jdoe@example.com')
+        ross = User(email='ross@example.com')
-    john.first_name = 'John'
+        ross.first_name = 'Ross'
-    john.last_name = 'Doe'
+        ross.last_name = 'Lawley'
-    john.save()
+        ross.save()
 
 Now that we've got our user in the database, let's add a couple of posts::
 
@@ -175,16 +214,17 @@ Now that we've got our user in the database, let's add a couple of posts::
     post1.tags = ['mongodb', 'mongoengine']
     post1.save()
 
-    post2 = LinkPost(title='MongoEngine Documentation', author=john)
+    post2 = LinkPost(title='MongoEngine Documentation', author=ross)
-    post2.link_url = 'http://tractiondigital.com/labs/mongoengine/docs'
+    post2.link_url = 'http://docs.mongoengine.com/'
     post2.tags = ['mongoengine']
     post2.save()
 
-Note that if you change a field on a object that has already been saved, then
+.. note:: If you change a field on a object that has already been saved, then
-call :meth:`save` again, the document will be updated.
+    call :meth:`save` again, the document will be updated.
 
 Accessing our data
 ==================
+
 So now we've got a couple of posts in our database, how do we display them?
 Each document class (i.e. any class that inherits either directly or indirectly
 from :class:`~mongoengine.Document`) has an :attr:`objects` attribute, which is
@@ -196,6 +236,7 @@ class. So let's see how we can get our posts' titles::
 
 Retrieving type-specific information
 ------------------------------------
+
 This will print the titles of our posts, one on each line. But What if we want
 to access the type-specific data (link_url, content, etc.)? One way is simply
 to use the :attr:`objects` attribute of a subclass of :class:`Post`::
@@ -234,6 +275,7 @@ text post, and "Link: <url>" if it was a link post.
 
 Searching our posts by tag
 --------------------------
+
 The :attr:`objects` attribute of a :class:`~mongoengine.Document` is actually a
 :class:`~mongoengine.queryset.QuerySet` object. This lazily queries the
 database only when you need the data. It may also be filtered to narrow down
@@ -250,5 +292,11 @@ the first matched by the query you provide. Aggregation functions may also be
 used on :class:`~mongoengine.queryset.QuerySet` objects::
 
     num_posts = Post.objects(tags='mongodb').count()
-    print 'Found % posts with tag "mongodb"' % num_posts
+    print 'Found %d posts with tag "mongodb"' % num_posts
 
+Learning more about mongoengine
+-------------------------------
+
+If you got this far you've made a great start, so well done!  The next step on
+your mongoengine journey is the `full user guide <guide/index.html>`_, where you
+can learn indepth about how to use mongoengine and mongodb.

docs/upgrade.rst

@@ -0,0 +1,534 @@
+#########
+Upgrading
+#########
+
+
+0.8.2 to 0.8.3
+**************
+
+Minor change that may impact users:
+
+DynamicDocument fields are now stored in creation order after any declared
+fields.  Previously they were stored alphabetically.
+
+
+0.7 to 0.8
+**********
+
+There have been numerous backwards breaking changes in 0.8.  The reasons for
+these are to ensure that MongoEngine has sane defaults going forward and that it
+performs the best it can out of the box.  Where possible there have been
+FutureWarnings to help get you ready for the change, but that hasn't been
+possible for the whole of the release.
+
+.. warning:: Breaking changes - test upgrading on a test system before putting
+    live. There maybe multiple manual steps in migrating and these are best honed
+    on a staging / test system.
+
+Python and PyMongo
+==================
+
+MongoEngine requires python 2.6 (or above) and pymongo 2.5 (or above)
+
+Data Model
+==========
+
+Inheritance
+-----------
+
+The inheritance model has changed, we no longer need to store an array of
+:attr:`types` with the model we can just use the classname in :attr:`_cls`.
+This means that you will have to update your indexes for each of your
+inherited classes like so: ::
+
+    # 1. Declaration of the class
+    class Animal(Document):
+        name = StringField()
+        meta = {
+            'allow_inheritance': True,
+            'indexes': ['name']
+        }
+
+    # 2. Remove _types
+    collection = Animal._get_collection()
+    collection.update({}, {"$unset": {"_types": 1}}, multi=True)
+
+    # 3. Confirm extra data is removed
+    count = collection.find({'_types': {"$exists": True}}).count()
+    assert count == 0
+
+    # 4. Remove indexes
+    info = collection.index_information()
+    indexes_to_drop = [key for key, value in info.iteritems()
+                       if '_types' in dict(value['key'])]
+    for index in indexes_to_drop:
+        collection.drop_index(index)
+
+    # 5. Recreate indexes
+    Animal.ensure_indexes()
+
+
+Document Definition
+-------------------
+
+The default for inheritance has changed - it is now off by default and
+:attr:`_cls` will not be stored automatically with the class.  So if you extend
+your :class:`~mongoengine.Document` or :class:`~mongoengine.EmbeddedDocuments`
+you will need to declare :attr:`allow_inheritance` in the meta data like so: ::
+
+    class Animal(Document):
+        name = StringField()
+
+        meta = {'allow_inheritance': True}
+
+Previously, if you had data in the database that wasn't defined in the Document
+definition, it would set it as an attribute on the document.  This is no longer
+the case and the data is set only in the ``document._data`` dictionary: ::
+
+    >>> from mongoengine import *
+    >>> class Animal(Document):
+    ...    name = StringField()
+    ...
+    >>> cat = Animal(name="kit", size="small")
+
+    # 0.7
+    >>> cat.size
+    u'small'
+
+    # 0.8
+    >>> cat.size
+    Traceback (most recent call last):
+      File "<stdin>", line 1, in <module>
+    AttributeError: 'Animal' object has no attribute 'size'
+
+The Document class has introduced a reserved function `clean()`, which will be
+called before saving the document. If your document class happens to have a method
+with the same name, please try to rename it.
+
+    def clean(self):
+        pass
+
+ReferenceField
+--------------
+
+ReferenceFields now store ObjectIds by default - this is more efficient than
+DBRefs as we already know what Document types they reference::
+
+    # Old code
+    class Animal(Document):
+        name = ReferenceField('self')
+
+    # New code to keep dbrefs
+    class Animal(Document):
+        name = ReferenceField('self', dbref=True)
+
+To migrate all the references you need to touch each object and mark it as dirty
+eg::
+
+    # Doc definition
+    class Person(Document):
+        name = StringField()
+        parent = ReferenceField('self')
+        friends = ListField(ReferenceField('self'))
+
+    # Mark all ReferenceFields as dirty and save
+    for p in Person.objects:
+        p._mark_as_changed('parent')
+        p._mark_as_changed('friends')
+        p.save()
+
+`An example test migration for ReferenceFields is available on github
+<https://github.com/MongoEngine/mongoengine/blob/master/tests/migration/refrencefield_dbref_to_object_id.py>`_.
+
+.. Note:: Internally mongoengine handles ReferenceFields the same, so they are
+   converted to DBRef on loading and ObjectIds or DBRefs depending on settings
+   on storage.
+
+UUIDField
+---------
+
+UUIDFields now default to storing binary values::
+
+    # Old code
+    class Animal(Document):
+        uuid = UUIDField()
+
+    # New code
+    class Animal(Document):
+        uuid = UUIDField(binary=False)
+
+To migrate all the uuids you need to touch each object and mark it as dirty
+eg::
+
+    # Doc definition
+    class Animal(Document):
+        uuid = UUIDField()
+
+    # Mark all UUIDFields as dirty and save
+    for a in Animal.objects:
+        a._mark_as_changed('uuid')
+        a.save()
+
+`An example test migration for UUIDFields is available on github
+<https://github.com/MongoEngine/mongoengine/blob/master/tests/migration/uuidfield_to_binary.py>`_.
+
+DecimalField
+------------
+
+DecimalFields now store floats - previously it was storing strings and that
+made it impossible to do comparisons when querying correctly.::
+
+    # Old code
+    class Person(Document):
+        balance = DecimalField()
+
+    # New code
+    class Person(Document):
+        balance = DecimalField(force_string=True)
+
+To migrate all the DecimalFields you need to touch each object and mark it as dirty
+eg::
+
+    # Doc definition
+    class Person(Document):
+        balance = DecimalField()
+
+    # Mark all DecimalField's as dirty and save
+    for p in Person.objects:
+        p._mark_as_changed('balance')
+        p.save()
+
+.. note:: DecimalFields have also been improved with the addition of precision
+    and rounding.  See :class:`~mongoengine.fields.DecimalField` for more information.
+
+`An example test migration for DecimalFields is available on github
+<https://github.com/MongoEngine/mongoengine/blob/master/tests/migration/decimalfield_as_float.py>`_.
+
+Cascading Saves
+---------------
+To improve performance document saves will no longer automatically cascade.
+Any changes to a Document's references will either have to be saved manually or
+you will have to explicitly tell it to cascade on save::
+
+    # At the class level:
+    class Person(Document):
+        meta = {'cascade': True}
+
+    # Or on save:
+    my_document.save(cascade=True)
+
+Storage
+-------
+
+Document and Embedded Documents are now serialized based on declared field order.
+Previously, the data was passed to mongodb as a dictionary and which meant that
+order wasn't guaranteed - so things like ``$addToSet`` operations on
+:class:`~mongoengine.EmbeddedDocument` could potentially fail in unexpected
+ways.
+
+If this impacts you, you may want to rewrite the objects using the
+``doc.mark_as_dirty('field')`` pattern described above.  If you are using a
+compound primary key then you will need to ensure the order is fixed and match
+your EmbeddedDocument to that order.
+
+Querysets
+=========
+
+Attack of the clones
+--------------------
+
+Querysets now return clones and should no longer be considered editable in
+place.  This brings us in line with how Django's querysets work and removes a
+long running gotcha.  If you edit your querysets inplace you will have to
+update your code like so: ::
+
+    # Old code:
+    mammals = Animal.objects(type="mammal")
+    mammals.filter(order="Carnivora")       # Returns a cloned queryset that isn't assigned to anything - so this will break in 0.8
+    [m for m in mammals]                    # This will return all mammals in 0.8 as the 2nd filter returned a new queryset
+
+    # Update example a) assign queryset after a change:
+    mammals = Animal.objects(type="mammal")
+    carnivores = mammals.filter(order="Carnivora") # Reassign the new queryset so filter can be applied
+    [m for m in carnivores]                        # This will return all carnivores
+
+    # Update example b) chain the queryset:
+    mammals = Animal.objects(type="mammal").filter(order="Carnivora")  # The final queryset is assgined to mammals
+    [m for m in mammals]                                               # This will return all carnivores
+
+Len iterates the queryset
+--------------------------
+
+If you ever did `len(queryset)` it previously did a `count()` under the covers,
+this caused some unusual issues.  As `len(queryset)` is most often used by
+`list(queryset)` we now cache the queryset results and use that for the length.
+
+This isn't as performant as a `count()` and if you aren't iterating the
+queryset you should upgrade to use count::
+
+    # Old code
+    len(Animal.objects(type="mammal"))
+
+    # New code
+    Animal.objects(type="mammal").count())
+
+
+.only() now inline with .exclude()
+----------------------------------
+
+The behaviour of `.only()` was highly ambiguous, now it works in mirror fashion
+to `.exclude()`.  Chaining `.only()` calls will increase the fields required::
+
+    # Old code
+    Animal.objects().only(['type', 'name']).only('name', 'order')  # Would have returned just `name`
+
+    # New code
+    Animal.objects().only('name')
+
+    # Note:
+    Animal.objects().only(['name']).only('order')  # Now returns `name` *and* `order`
+
+
+Client
+======
+PyMongo 2.4 came with a new connection client; MongoClient_ and started the
+depreciation of the old :class:`~pymongo.connection.Connection`. MongoEngine
+now uses the latest `MongoClient` for connections.  By default operations were
+`safe` but if you turned them off or used the connection directly this will
+impact your queries.
+
+Querysets
+---------
+
+Safe
+^^^^
+
+`safe` has been depreciated in the new MongoClient connection.  Please use
+`write_concern` instead.  As `safe` always defaulted as `True` normally no code
+change is required. To disable confirmation of the write just pass `{"w": 0}`
+eg: ::
+
+   # Old
+   Animal(name="Dinasour").save(safe=False)
+
+   # new code:
+   Animal(name="Dinasour").save(write_concern={"w": 0})
+
+Write Concern
+^^^^^^^^^^^^^
+
+`write_options` has been replaced with `write_concern` to bring it inline with
+pymongo. To upgrade simply rename any instances where you used the `write_option`
+keyword  to `write_concern` like so::
+
+   # Old code:
+   Animal(name="Dinasour").save(write_options={"w": 2})
+
+   # new code:
+   Animal(name="Dinasour").save(write_concern={"w": 2})
+
+
+Indexes
+=======
+
+Index methods are no longer tied to querysets but rather to the document class.
+Although `QuerySet._ensure_indexes` and `QuerySet.ensure_index` still exist.
+They should be replaced with :func:`~mongoengine.Document.ensure_indexes` /
+:func:`~mongoengine.Document.ensure_index`.
+
+SequenceFields
+==============
+
+:class:`~mongoengine.fields.SequenceField` now inherits from `BaseField` to
+allow flexible storage of the calculated value.  As such MIN and MAX settings
+are no longer handled.
+
+.. _MongoClient: http://blog.mongodb.org/post/36666163412/introducing-mongoclient
+
+0.6 to 0.7
+**********
+
+Cascade saves
+=============
+
+Saves will raise a `FutureWarning` if they cascade and cascade hasn't been set
+to True.  This is because in 0.8 it will default to False.  If you require
+cascading saves then either set it in the `meta` or pass
+via `save` eg ::
+
+    # At the class level:
+    class Person(Document):
+        meta = {'cascade': True}
+
+    # Or in code:
+    my_document.save(cascade=True)
+
+.. note::
+    Remember: cascading saves **do not** cascade through lists.
+
+ReferenceFields
+===============
+
+ReferenceFields now can store references as ObjectId strings instead of DBRefs.
+This will become the default in 0.8 and if `dbref` is not set a `FutureWarning`
+will be raised.
+
+
+To explicitly continue to use DBRefs change the `dbref` flag
+to True ::
+
+   class Person(Document):
+       groups = ListField(ReferenceField(Group, dbref=True))
+
+To migrate to using strings instead of DBRefs you will have to manually
+migrate ::
+
+        # Step 1 - Migrate the model definition
+        class Group(Document):
+            author = ReferenceField(User, dbref=False)
+            members = ListField(ReferenceField(User, dbref=False))
+
+        # Step 2 - Migrate the data
+        for g in Group.objects():
+            g.author = g.author
+            g.members = g.members
+            g.save()
+
+
+item_frequencies
+================
+
+In the 0.6 series we added support for null / zero / false values in
+item_frequencies.  A side effect was to return keys in the value they are
+stored in rather than as string representations.  Your code may need to be
+updated to handle native types rather than strings keys for the results of
+item frequency queries.
+
+BinaryFields
+============
+
+Binary fields have been updated so that they are native binary types.  If you
+previously were doing `str` comparisons with binary field values you will have
+to update and wrap the value in a `str`.
+
+0.5 to 0.6
+**********
+
+Embedded Documents - if you had a `pk` field you will have to rename it from
+`_id` to `pk` as pk is no longer a property of Embedded Documents.
+
+Reverse Delete Rules in Embedded Documents, MapFields and DictFields now throw
+an InvalidDocument error as they aren't currently supported.
+
+Document._get_subclasses - Is no longer used and the class method has been
+removed.
+
+Document.objects.with_id - now raises an InvalidQueryError if used with a
+filter.
+
+FutureWarning - A future warning has been added to all inherited classes that
+don't define :attr:`allow_inheritance` in their meta.
+
+You may need to update pyMongo to 2.0 for use with Sharding.
+
+0.4 to 0.5
+**********
+
+There have been the following backwards incompatibilities from 0.4 to 0.5.  The
+main areas of changed are: choices in fields, map_reduce and collection names.
+
+Choice options:
+===============
+
+Are now expected to be an iterable of tuples, with the first element in each
+tuple being the actual value to be stored. The second element is the
+human-readable name for the option.
+
+
+PyMongo / MongoDB
+=================
+
+map reduce now requires pymongo 1.11+- The pymongo `merge_output` and
+`reduce_output` parameters, have been depreciated.
+
+More methods now use map_reduce as db.eval is not supported for sharding as
+such the following have been changed:
+
+    * :meth:`~mongoengine.queryset.QuerySet.sum`
+    * :meth:`~mongoengine.queryset.QuerySet.average`
+    * :meth:`~mongoengine.queryset.QuerySet.item_frequencies`
+
+
+Default collection naming
+=========================
+
+Previously it was just lowercase, it's now much more pythonic and readable as
+it's lowercase and underscores, previously ::
+
+    class MyAceDocument(Document):
+        pass
+
+    MyAceDocument._meta['collection'] == myacedocument
+
+In 0.5 this will change to ::
+
+    class MyAceDocument(Document):
+        pass
+
+    MyAceDocument._get_collection_name() == my_ace_document
+
+To upgrade use a Mixin class to set meta like so ::
+
+    class BaseMixin(object):
+        meta = {
+            'collection': lambda c: c.__name__.lower()
+        }
+
+    class MyAceDocument(Document, BaseMixin):
+        pass
+
+    MyAceDocument._get_collection_name() == "myacedocument"
+
+Alternatively, you can rename your collections eg ::
+
+    from mongoengine.connection import _get_db
+    from mongoengine.base import _document_registry
+
+    def rename_collections():
+        db = _get_db()
+
+        failure = False
+
+        collection_names = [d._get_collection_name()
+                            for d in _document_registry.values()]
+
+        for new_style_name in collection_names:
+            if not new_style_name:  # embedded documents don't have collections
+                continue
+            old_style_name = new_style_name.replace('_', '')
+
+            if old_style_name == new_style_name:
+                continue  # Nothing to do
+
+            existing = db.collection_names()
+            if old_style_name in existing:
+                if new_style_name in existing:
+                    failure = True
+                    print "FAILED to rename: %s to %s (already exists)" % (
+                        old_style_name, new_style_name)
+                else:
+                    db[old_style_name].rename(new_style_name)
+                    print "Renamed:  %s to %s" % (old_style_name,
+                                                  new_style_name)
+
+        if failure:
+            print "Upgrading  collection names failed"
+        else:
+            print "Upgraded collection names"
+
+
+mongodb 1.8 > 2.0 +
+===================
+
+It's been reported that indexes may need to be recreated to the newer version of indexes.
+To do this drop indexes and call ``ensure_indexes`` on each model.

mongoengine/__init__.py

@@ -6,19 +6,21 @@ import connection
 from connection import *
 import queryset
 from queryset import *
+import signals
+from signals import *
+from errors import *
+import errors
+import django
 
-__all__ = (document.__all__ + fields.__all__ + connection.__all__ +
+__all__ = (list(document.__all__) + fields.__all__ + connection.__all__ +
-           queryset.__all__)
+           list(queryset.__all__) + signals.__all__ + list(errors.__all__))
 
-__author__ = 'Harry Marr'
+VERSION = (0, 8, 4)
 
-VERSION = (0, 2, 2)
 
 def get_version():
-    version = '%s.%s' % (VERSION[0], VERSION[1])
+    if isinstance(VERSION[-1], basestring):
-    if VERSION[2]:
+        return '.'.join(map(str, VERSION[:-1])) + VERSION[-1]
-        version = '%s.%s' % (version, VERSION[2])
+    return '.'.join(map(str, VERSION))
-    return version
 
 __version__ = get_version()
-

mongoengine/base.py

@@ -1,375 +0,0 @@
-from queryset import QuerySet, QuerySetManager
-
-import pymongo
-
-
-class ValidationError(Exception):
-    pass
-
-
-class BaseField(object):
-    """A base class for fields in a MongoDB document. Instances of this class
-    may be added to subclasses of `Document` to define a document's schema.
-    """
-
-    # Fields may have _types inserted into indexes by default 
-    _index_with_types = True
-    
-    def __init__(self, name=None, required=False, default=None, unique=False,
-                 unique_with=None, primary_key=False):
-        self.name = name if not primary_key else '_id'
-        self.required = required or primary_key
-        self.default = default
-        self.unique = bool(unique or unique_with)
-        self.unique_with = unique_with
-        self.primary_key = primary_key
-
-    def __get__(self, instance, owner):
-        """Descriptor for retrieving a value from a field in a document. Do 
-        any necessary conversion between Python and MongoDB types.
-        """
-        if instance is None:
-            # Document class being used rather than a document object
-            return self
-
-        # Get value from document instance if available, if not use default
-        value = instance._data.get(self.name)
-        if value is None:
-            value = self.default
-            # Allow callable default values
-            if callable(value):
-                value = value()
-        return value
-
-    def __set__(self, instance, value):
-        """Descriptor for assigning a value to a field in a document.
-        """
-        instance._data[self.name] = value
-
-    def to_python(self, value):
-        """Convert a MongoDB-compatible type to a Python type.
-        """
-        return value
-
-    def to_mongo(self, value):
-        """Convert a Python type to a MongoDB-compatible type.
-        """
-        return self.to_python(value)
-
-    def prepare_query_value(self, value):
-        """Prepare a value that is being used in a query for PyMongo.
-        """
-        return value
-
-    def validate(self, value):
-        """Perform validation on a value.
-        """
-        pass
-
-
-class ObjectIdField(BaseField):
-    """An field wrapper around MongoDB's ObjectIds.
-    """
-    
-    def to_python(self, value):
-        return unicode(value)
-
-    def to_mongo(self, value):
-        if not isinstance(value, pymongo.objectid.ObjectId):
-            return pymongo.objectid.ObjectId(str(value))
-        return value
-
-    def prepare_query_value(self, value):
-        return self.to_mongo(value)
-
-    def validate(self, value):
-        try:
-            pymongo.objectid.ObjectId(str(value))
-        except:
-            raise ValidationError('Invalid Object ID')
-
-
-class DocumentMetaclass(type):
-    """Metaclass for all documents.
-    """
-
-    def __new__(cls, name, bases, attrs):
-        metaclass = attrs.get('__metaclass__')
-        super_new = super(DocumentMetaclass, cls).__new__
-        if metaclass and issubclass(metaclass, DocumentMetaclass):
-            return super_new(cls, name, bases, attrs)
-
-        doc_fields = {}
-        class_name = [name]
-        superclasses = {}
-        for base in bases:
-            # Include all fields present in superclasses
-            if hasattr(base, '_fields'):
-                doc_fields.update(base._fields)
-                class_name.append(base._class_name)
-                # Get superclasses from superclass
-                superclasses[base._class_name] = base
-                superclasses.update(base._superclasses)
-        attrs['_class_name'] = '.'.join(reversed(class_name))
-        attrs['_superclasses'] = superclasses
-
-        # Add the document's fields to the _fields attribute
-        for attr_name, attr_value in attrs.items():
-            if hasattr(attr_value, "__class__") and \
-                issubclass(attr_value.__class__, BaseField):
-                if not attr_value.name:
-                    attr_value.name = attr_name
-                doc_fields[attr_name] = attr_value
-        attrs['_fields'] = doc_fields
-
-        return super_new(cls, name, bases, attrs)
-
-
-class TopLevelDocumentMetaclass(DocumentMetaclass):
-    """Metaclass for top-level documents (i.e. documents that have their own
-    collection in the database.
-    """
-
-    def __new__(cls, name, bases, attrs):
-        super_new = super(TopLevelDocumentMetaclass, cls).__new__
-        # Classes defined in this package are abstract and should not have 
-        # their own metadata with DB collection, etc.
-        # __metaclass__ is only set on the class with the __metaclass__ 
-        # attribute (i.e. it is not set on subclasses). This differentiates
-        # 'real' documents from the 'Document' class
-        if attrs.get('__metaclass__') == TopLevelDocumentMetaclass:
-            return super_new(cls, name, bases, attrs)
-
-        collection = name.lower()
-        
-        simple_class = True
-        id_field = None
-        base_indexes = []
-
-        # Subclassed documents inherit collection from superclass
-        for base in bases:
-            if hasattr(base, '_meta') and 'collection' in base._meta:
-                # Ensure that the Document class may be subclassed - 
-                # inheritance may be disabled to remove dependency on 
-                # additional fields _cls and _types
-                if base._meta.get('allow_inheritance', True) == False:
-                    raise ValueError('Document %s may not be subclassed' %
-                                     base.__name__)
-                else:
-                    simple_class = False
-                collection = base._meta['collection']
-
-                id_field = id_field or base._meta.get('id_field')
-                base_indexes += base._meta.get('indexes', [])
-
-        meta = {
-            'collection': collection,
-            'allow_inheritance': True,
-            'max_documents': None,
-            'max_size': None,
-            'ordering': [], # default ordering applied at runtime
-            'indexes': [], # indexes to be ensured at runtime
-            'id_field': id_field,
-        }
-
-        # Apply document-defined meta options
-        meta.update(attrs.get('meta', {}))
-
-        # Only simple classes - direct subclasses of Document - may set
-        # allow_inheritance to False
-        if not simple_class and not meta['allow_inheritance']:
-            raise ValueError('Only direct subclasses of Document may set '
-                             '"allow_inheritance" to False')
-        attrs['_meta'] = meta
-
-        # Set up collection manager, needs the class to have fields so use
-        # DocumentMetaclass before instantiating CollectionManager object
-        new_class = super_new(cls, name, bases, attrs)
-        new_class.objects = QuerySetManager()
-
-        user_indexes = [QuerySet._build_index_spec(new_class, spec)
-                        for spec in meta['indexes']] + base_indexes
-        new_class._meta['indexes'] = user_indexes
-        
-        unique_indexes = []
-        for field_name, field in new_class._fields.items():
-            # Generate a list of indexes needed by uniqueness constraints
-            if field.unique:
-                field.required = True
-                unique_fields = [field_name]
-
-                # Add any unique_with fields to the back of the index spec
-                if field.unique_with:
-                    if isinstance(field.unique_with, basestring):
-                        field.unique_with = [field.unique_with]
-
-                    # Convert unique_with field names to real field names
-                    unique_with = []
-                    for other_name in field.unique_with:
-                        parts = other_name.split('.')
-                        # Lookup real name
-                        parts = QuerySet._lookup_field(new_class, parts)
-                        name_parts = [part.name for part in parts]
-                        unique_with.append('.'.join(name_parts))
-                        # Unique field should be required
-                        parts[-1].required = True
-                    unique_fields += unique_with
-
-                # Add the new index to the list
-                index = [(f, pymongo.ASCENDING) for f in unique_fields]
-                unique_indexes.append(index)
-
-            # Check for custom primary key
-            if field.primary_key:
-                if not new_class._meta['id_field']:
-                    new_class._meta['id_field'] = field_name
-                    # Make 'Document.id' an alias to the real primary key field
-                    new_class.id = field
-                    #new_class._fields['id'] = field
-                else:
-                    raise ValueError('Cannot override primary key field')
-
-        new_class._meta['unique_indexes'] = unique_indexes
-
-        if not new_class._meta['id_field']:
-            new_class._meta['id_field'] = 'id'
-            new_class.id = new_class._fields['id'] = ObjectIdField(name='_id')
-
-        return new_class
-
-
-class BaseDocument(object):
-
-    def __init__(self, **values):
-        self._data = {}
-        # Assign initial values to instance
-        for attr_name, attr_value in self._fields.items():
-            if attr_name in values:
-                setattr(self, attr_name, values.pop(attr_name))
-            else:
-                # Use default value if present
-                value = getattr(self, attr_name, None)
-                setattr(self, attr_name, value)
-
-    def validate(self):
-        """Ensure that all fields' values are valid and that required fields
-        are present.
-        """
-        # Get a list of tuples of field names and their current values
-        fields = [(field, getattr(self, name)) 
-                  for name, field in self._fields.items()]
-
-        # Ensure that each field is matched to a valid value
-        for field, value in fields:
-            if value is not None:
-                try:
-                    field.validate(value)
-                except (ValueError, AttributeError, AssertionError), e:
-                    raise ValidationError('Invalid value for field of type "' +
-                                          field.__class__.__name__ + '"')
-            elif field.required:
-                raise ValidationError('Field "%s" is required' % field.name)
-
-    @classmethod
-    def _get_subclasses(cls):
-        """Return a dictionary of all subclasses (found recursively).
-        """
-        try:
-            subclasses = cls.__subclasses__()
-        except:
-            subclasses = cls.__subclasses__(cls)
-
-        all_subclasses = {}
-        for subclass in subclasses:
-            all_subclasses[subclass._class_name] = subclass
-            all_subclasses.update(subclass._get_subclasses())
-        return all_subclasses
-
-    def __iter__(self):
-        return iter(self._fields)
-
-    def __getitem__(self, name):
-        """Dictionary-style field access, return a field's value if present.
-        """
-        try:
-            if name in self._fields:
-                return getattr(self, name)
-        except AttributeError:
-            pass
-        raise KeyError(name)
-
-    def __setitem__(self, name, value):
-        """Dictionary-style field access, set a field's value.
-        """
-        # Ensure that the field exists before settings its value
-        if name not in self._fields:
-            raise KeyError(name)
-        return setattr(self, name, value)
-
-    def __contains__(self, name):
-        try:
-            val = getattr(self, name)
-            return val is not None
-        except AttributeError:
-            return False
-
-    def __len__(self):
-        return len(self._data)
-
-    def __repr__(self):
-        try:
-            u = unicode(self)
-        except (UnicodeEncodeError, UnicodeDecodeError):
-            u = '[Bad Unicode data]'
-        return u'<%s: %s>' % (self.__class__.__name__, u)
-
-    def __str__(self):
-        if hasattr(self, '__unicode__'):
-            return unicode(self).encode('utf-8')
-        return '%s object' % self.__class__.__name__
-
-    def to_mongo(self):
-        """Return data dictionary ready for use with MongoDB.
-        """
-        data = {}
-        for field_name, field in self._fields.items():
-            value = getattr(self, field_name, None)
-            if value is not None:
-                data[field.name] = field.to_mongo(value)
-        # Only add _cls and _types if allow_inheritance is not False
-        if not (hasattr(self, '_meta') and
-                self._meta.get('allow_inheritance', True) == False):
-            data['_cls'] = self._class_name
-            data['_types'] = self._superclasses.keys() + [self._class_name]
-        return data
-    
-    @classmethod
-    def _from_son(cls, son):
-        """Create an instance of a Document (subclass) from a PyMongo SOM.
-        """
-        # get the class name from the document, falling back to the given
-        # class if unavailable
-        class_name = son.get(u'_cls', cls._class_name)
-
-        data = dict((str(key), value) for key, value in son.items())
-
-        if '_types' in data:
-            del data['_types']
-
-        if '_cls' in data:
-            del data['_cls']
-
-        # Return correct subclass for document type
-        if class_name != cls._class_name:
-            subclasses = cls._get_subclasses()
-            if class_name not in subclasses:
-                # Type of document is probably more generic than the class
-                # that has been queried to return this SON
-                return None
-            cls = subclasses[class_name]
-
-        for field_name, field in cls._fields.items():
-            if field.name in data:
-                data[field_name] = field.to_python(data[field.name])
-
-        return cls(**data)

mongoengine/base/__init__.py

@@ -0,0 +1,8 @@
+from mongoengine.base.common import *
+from mongoengine.base.datastructures import *
+from mongoengine.base.document import *
+from mongoengine.base.fields import *
+from mongoengine.base.metaclasses import *
+
+# Help with backwards compatibility
+from mongoengine.errors import *

mongoengine/base/common.py

@@ -0,0 +1,26 @@
+from mongoengine.errors import NotRegistered
+
+__all__ = ('ALLOW_INHERITANCE', 'get_document', '_document_registry')
+
+ALLOW_INHERITANCE = False
+
+_document_registry = {}
+
+
+def get_document(name):
+    doc = _document_registry.get(name, None)
+    if not doc:
+        # Possible old style name
+        single_end = name.split('.')[-1]
+        compound_end = '.%s' % single_end
+        possible_match = [k for k in _document_registry.keys()
+                          if k.endswith(compound_end) or k == single_end]
+        if len(possible_match) == 1:
+            doc = _document_registry.get(possible_match.pop(), None)
+    if not doc:
+        raise NotRegistered("""
+            `%s` has not been registered in the document registry.
+            Importing the document class automatically registers it, has it
+            been imported?
+        """.strip() % name)
+    return doc

mongoengine/base/datastructures.py

@@ -0,0 +1,158 @@
+import weakref
+from mongoengine.common import _import_class
+
+__all__ = ("BaseDict", "BaseList")
+
+
+class BaseDict(dict):
+    """A special dict so we can watch any changes
+    """
+
+    _dereferenced = False
+    _instance = None
+    _name = None
+
+    def __init__(self, dict_items, instance, name):
+        Document = _import_class('Document')
+        EmbeddedDocument = _import_class('EmbeddedDocument')
+
+        if isinstance(instance, (Document, EmbeddedDocument)):
+            self._instance = weakref.proxy(instance)
+        self._name = name
+        return super(BaseDict, self).__init__(dict_items)
+
+    def __getitem__(self, *args, **kwargs):
+        value = super(BaseDict, self).__getitem__(*args, **kwargs)
+
+        EmbeddedDocument = _import_class('EmbeddedDocument')
+        if isinstance(value, EmbeddedDocument) and value._instance is None:
+            value._instance = self._instance
+        return value
+
+    def __setitem__(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).__setitem__(*args, **kwargs)
+
+    def __delete__(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).__delete__(*args, **kwargs)
+
+    def __delitem__(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).__delitem__(*args, **kwargs)
+
+    def __delattr__(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).__delattr__(*args, **kwargs)
+
+    def __getstate__(self):
+        self.instance = None
+        self._dereferenced = False
+        return self
+
+    def __setstate__(self, state):
+        self = state
+        return self
+
+    def clear(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).clear(*args, **kwargs)
+
+    def pop(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).pop(*args, **kwargs)
+
+    def popitem(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).popitem(*args, **kwargs)
+
+    def update(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).update(*args, **kwargs)
+
+    def _mark_as_changed(self):
+        if hasattr(self._instance, '_mark_as_changed'):
+            self._instance._mark_as_changed(self._name)
+
+
+class BaseList(list):
+    """A special list so we can watch any changes
+    """
+
+    _dereferenced = False
+    _instance = None
+    _name = None
+
+    def __init__(self, list_items, instance, name):
+        Document = _import_class('Document')
+        EmbeddedDocument = _import_class('EmbeddedDocument')
+
+        if isinstance(instance, (Document, EmbeddedDocument)):
+            self._instance = weakref.proxy(instance)
+        self._name = name
+        return super(BaseList, self).__init__(list_items)
+
+    def __getitem__(self, *args, **kwargs):
+        value = super(BaseList, self).__getitem__(*args, **kwargs)
+
+        EmbeddedDocument = _import_class('EmbeddedDocument')
+        if isinstance(value, EmbeddedDocument) and value._instance is None:
+            value._instance = self._instance
+        return value
+
+    def __setitem__(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).__setitem__(*args, **kwargs)
+
+    def __delitem__(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).__delitem__(*args, **kwargs)
+
+    def __setslice__(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).__setslice__(*args, **kwargs)
+
+    def __delslice__(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).__delslice__(*args, **kwargs)
+
+    def __getstate__(self):
+        self.instance = None
+        self._dereferenced = False
+        return self
+
+    def __setstate__(self, state):
+        self = state
+        return self
+
+    def append(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).append(*args, **kwargs)
+
+    def extend(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).extend(*args, **kwargs)
+
+    def insert(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).insert(*args, **kwargs)
+
+    def pop(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).pop(*args, **kwargs)
+
+    def remove(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).remove(*args, **kwargs)
+
+    def reverse(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).reverse(*args, **kwargs)
+
+    def sort(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).sort(*args, **kwargs)
+
+    def _mark_as_changed(self):
+        if hasattr(self._instance, '_mark_as_changed'):
+            self._instance._mark_as_changed(self._name)

mongoengine/base/document.py

@@ -0,0 +1,825 @@
+import copy
+import operator
+import numbers
+from functools import partial
+
+import pymongo
+from bson import json_util, ObjectId
+from bson.dbref import DBRef
+from bson.son import SON
+
+from mongoengine import signals
+from mongoengine.common import _import_class
+from mongoengine.errors import (ValidationError, InvalidDocumentError,
+                                LookUpError)
+from mongoengine.python_support import (PY3, UNICODE_KWARGS, txt_type,
+                                        to_str_keys_recursive)
+
+from mongoengine.base.common import get_document, ALLOW_INHERITANCE
+from mongoengine.base.datastructures import BaseDict, BaseList
+from mongoengine.base.fields import ComplexBaseField
+
+__all__ = ('BaseDocument', 'NON_FIELD_ERRORS')
+
+NON_FIELD_ERRORS = '__all__'
+
+
+class BaseDocument(object):
+
+    _dynamic = False
+    _created = True
+    _dynamic_lock = True
+    _initialised = False
+
+    def __init__(self, *args, **values):
+        """
+        Initialise a document or embedded document
+
+        :param __auto_convert: Try and will cast python objects to Object types
+        :param values: A dictionary of values for the document
+        """
+        if args:
+            # Combine positional arguments with named arguments.
+            # We only want named arguments.
+            field = iter(self._fields_ordered)
+            # If its an automatic id field then skip to the first defined field
+            if self._auto_id_field:
+                next(field)
+            for value in args:
+                name = next(field)
+                if name in values:
+                    raise TypeError("Multiple values for keyword argument '" + name + "'")
+                values[name] = value
+        __auto_convert = values.pop("__auto_convert", True)
+        signals.pre_init.send(self.__class__, document=self, values=values)
+
+        self._data = {}
+        self._dynamic_fields = SON()
+
+        # Assign default values to instance
+        for key, field in self._fields.iteritems():
+            if self._db_field_map.get(key, key) in values:
+                continue
+            value = getattr(self, key, None)
+            setattr(self, key, value)
+
+        # Set passed values after initialisation
+        if self._dynamic:
+            dynamic_data = {}
+            for key, value in values.iteritems():
+                if key in self._fields or key == '_id':
+                    setattr(self, key, value)
+                elif self._dynamic:
+                    dynamic_data[key] = value
+        else:
+            FileField = _import_class('FileField')
+            for key, value in values.iteritems():
+                if key == '__auto_convert':
+                    continue
+                key = self._reverse_db_field_map.get(key, key)
+                if key in self._fields or key in ('id', 'pk', '_cls'):
+                    if __auto_convert and value is not None:
+                        field = self._fields.get(key)
+                        if field and not isinstance(field, FileField):
+                            value = field.to_python(value)
+                    setattr(self, key, value)
+                else:
+                    self._data[key] = value
+
+        # Set any get_fieldname_display methods
+        self.__set_field_display()
+
+        if self._dynamic:
+            self._dynamic_lock = False
+            for key, value in dynamic_data.iteritems():
+                setattr(self, key, value)
+
+        # Flag initialised
+        self._initialised = True
+        signals.post_init.send(self.__class__, document=self)
+
+    def __delattr__(self, *args, **kwargs):
+        """Handle deletions of fields"""
+        field_name = args[0]
+        if field_name in self._fields:
+            default = self._fields[field_name].default
+            if callable(default):
+                default = default()
+            setattr(self, field_name, default)
+        else:
+            super(BaseDocument, self).__delattr__(*args, **kwargs)
+
+    def __setattr__(self, name, value):
+        # Handle dynamic data only if an initialised dynamic document
+        if self._dynamic and not self._dynamic_lock:
+
+            field = None
+            if not hasattr(self, name) and not name.startswith('_'):
+                DynamicField = _import_class("DynamicField")
+                field = DynamicField(db_field=name)
+                field.name = name
+                self._dynamic_fields[name] = field
+                self._fields_ordered += (name,)
+
+            if not name.startswith('_'):
+                value = self.__expand_dynamic_values(name, value)
+
+            # Handle marking data as changed
+            if name in self._dynamic_fields:
+                self._data[name] = value
+                if hasattr(self, '_changed_fields'):
+                    self._mark_as_changed(name)
+
+        if (self._is_document and not self._created and
+           name in self._meta.get('shard_key', tuple()) and
+           self._data.get(name) != value):
+            OperationError = _import_class('OperationError')
+            msg = "Shard Keys are immutable. Tried to update %s" % name
+            raise OperationError(msg)
+
+        # Check if the user has created a new instance of a class
+        if (self._is_document and self._initialised
+           and self._created and name == self._meta['id_field']):
+                super(BaseDocument, self).__setattr__('_created', False)
+
+        super(BaseDocument, self).__setattr__(name, value)
+
+    def __getstate__(self):
+        data = {}
+        for k in ('_changed_fields', '_initialised', '_created',
+                  '_dynamic_fields', '_fields_ordered'):
+            if hasattr(self, k):
+                data[k] = getattr(self, k)
+        data['_data'] = self.to_mongo()
+        return data
+
+    def __setstate__(self, data):
+        if isinstance(data["_data"], SON):
+            data["_data"] = self.__class__._from_son(data["_data"])._data
+        for k in ('_changed_fields', '_initialised', '_created', '_data',
+                  '_fields_ordered', '_dynamic_fields'):
+            if k in data:
+                setattr(self, k, data[k])
+        dynamic_fields = data.get('_dynamic_fields') or SON()
+        for k in dynamic_fields.keys():
+            setattr(self, k, data["_data"].get(k))
+
+    def __iter__(self):
+        return iter(self._fields_ordered)
+
+    def __getitem__(self, name):
+        """Dictionary-style field access, return a field's value if present.
+        """
+        try:
+            if name in self._fields_ordered:
+                return getattr(self, name)
+        except AttributeError:
+            pass
+        raise KeyError(name)
+
+    def __setitem__(self, name, value):
+        """Dictionary-style field access, set a field's value.
+        """
+        # Ensure that the field exists before settings its value
+        if name not in self._fields:
+            raise KeyError(name)
+        return setattr(self, name, value)
+
+    def __contains__(self, name):
+        try:
+            val = getattr(self, name)
+            return val is not None
+        except AttributeError:
+            return False
+
+    def __len__(self):
+        return len(self._data)
+
+    def __repr__(self):
+        try:
+            u = self.__str__()
+        except (UnicodeEncodeError, UnicodeDecodeError):
+            u = '[Bad Unicode data]'
+        repr_type = type(u)
+        return repr_type('<%s: %s>' % (self.__class__.__name__, u))
+
+    def __str__(self):
+        if hasattr(self, '__unicode__'):
+            if PY3:
+                return self.__unicode__()
+            else:
+                return unicode(self).encode('utf-8')
+        return txt_type('%s object' % self.__class__.__name__)
+
+    def __eq__(self, other):
+        if isinstance(other, self.__class__) and hasattr(other, 'id'):
+            if self.id == other.id:
+                return True
+        return False
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
+    def __hash__(self):
+        if getattr(self, 'pk', None) is None:
+            # For new object
+            return super(BaseDocument, self).__hash__()
+        else:
+            return hash(self.pk)
+
+    def clean(self):
+        """
+        Hook for doing document level data cleaning before validation is run.
+
+        Any ValidationError raised by this method will not be associated with
+        a particular field; it will have a special-case association with the
+        field defined by NON_FIELD_ERRORS.
+        """
+        pass
+
+    def to_mongo(self):
+        """Return as SON data ready for use with MongoDB.
+        """
+        data = SON()
+        data["_id"] = None
+        data['_cls'] = self._class_name
+
+        for field_name in self:
+            value = self._data.get(field_name, None)
+            field = self._fields.get(field_name)
+            if field is None and self._dynamic:
+                field = self._dynamic_fields.get(field_name)
+
+            if value is not None:
+                value = field.to_mongo(value)
+
+            # Handle self generating fields
+            if value is None and field._auto_gen:
+                value = field.generate()
+                self._data[field_name] = value
+
+            if value is not None:
+                data[field.db_field] = value
+
+        # If "_id" has not been set, then try and set it
+        Document = _import_class("Document")
+        if isinstance(self, Document):
+            if data["_id"] is None:
+                data["_id"] = self._data.get("id", None)
+
+        if data['_id'] is None:
+            data.pop('_id')
+
+        # Only add _cls if allow_inheritance is True
+        if (not hasattr(self, '_meta') or
+           not self._meta.get('allow_inheritance', ALLOW_INHERITANCE)):
+            data.pop('_cls')
+
+        return data
+
+    def validate(self, clean=True):
+        """Ensure that all fields' values are valid and that required fields
+        are present.
+        """
+        # Ensure that each field is matched to a valid value
+        errors = {}
+        if clean:
+            try:
+                self.clean()
+            except ValidationError, error:
+                errors[NON_FIELD_ERRORS] = error
+
+        # Get a list of tuples of field names and their current values
+        fields = [(self._fields.get(name, self._dynamic_fields.get(name)),
+                   self._data.get(name)) for name in self._fields_ordered]
+
+        EmbeddedDocumentField = _import_class("EmbeddedDocumentField")
+        GenericEmbeddedDocumentField = _import_class("GenericEmbeddedDocumentField")
+
+        for field, value in fields:
+            if value is not None:
+                try:
+                    if isinstance(field, (EmbeddedDocumentField,
+                                          GenericEmbeddedDocumentField)):
+                        field._validate(value, clean=clean)
+                    else:
+                        field._validate(value)
+                except ValidationError, error:
+                    errors[field.name] = error.errors or error
+                except (ValueError, AttributeError, AssertionError), error:
+                    errors[field.name] = error
+            elif field.required and not getattr(field, '_auto_gen', False):
+                errors[field.name] = ValidationError('Field is required',
+                                                     field_name=field.name)
+
+        if errors:
+            pk = "None"
+            if hasattr(self, 'pk'):
+                pk = self.pk
+            elif self._instance:
+                pk = self._instance.pk
+            message = "ValidationError (%s:%s) " % (self._class_name, pk)
+            raise ValidationError(message, errors=errors)
+
+    def to_json(self, *args, **kwargs):
+        """Converts a document to JSON"""
+        return json_util.dumps(self.to_mongo(),  *args, **kwargs)
+
+    @classmethod
+    def from_json(cls, json_data):
+        """Converts json data to an unsaved document instance"""
+        return cls._from_son(json_util.loads(json_data))
+
+    def __expand_dynamic_values(self, name, value):
+        """expand any dynamic values to their correct types / values"""
+        if not isinstance(value, (dict, list, tuple)):
+            return value
+
+        is_list = False
+        if not hasattr(value, 'items'):
+            is_list = True
+            value = dict([(k, v) for k, v in enumerate(value)])
+
+        if not is_list and '_cls' in value:
+            cls = get_document(value['_cls'])
+            return cls(**value)
+
+        data = {}
+        for k, v in value.items():
+            key = name if is_list else k
+            data[k] = self.__expand_dynamic_values(key, v)
+
+        if is_list:  # Convert back to a list
+            data_items = sorted(data.items(), key=operator.itemgetter(0))
+            value = [v for k, v in data_items]
+        else:
+            value = data
+
+        # Convert lists / values so we can watch for any changes on them
+        if (isinstance(value, (list, tuple)) and
+           not isinstance(value, BaseList)):
+            value = BaseList(value, self, name)
+        elif isinstance(value, dict) and not isinstance(value, BaseDict):
+            value = BaseDict(value, self, name)
+
+        return value
+
+    def _mark_as_changed(self, key):
+        """Marks a key as explicitly changed by the user
+        """
+        if not key:
+            return
+        key = self._db_field_map.get(key, key)
+        if (hasattr(self, '_changed_fields') and
+           key not in self._changed_fields):
+            self._changed_fields.append(key)
+
+    def _clear_changed_fields(self):
+        self._changed_fields = []
+        EmbeddedDocumentField = _import_class("EmbeddedDocumentField")
+        for field_name, field in self._fields.iteritems():
+            if (isinstance(field, ComplexBaseField) and
+               isinstance(field.field, EmbeddedDocumentField)):
+                field_value = getattr(self, field_name, None)
+                if field_value:
+                    for idx in (field_value if isinstance(field_value, dict)
+                                else xrange(len(field_value))):
+                        field_value[idx]._clear_changed_fields()
+            elif isinstance(field, EmbeddedDocumentField):
+                field_value = getattr(self, field_name, None)
+                if field_value:
+                    field_value._clear_changed_fields()
+
+    def _get_changed_fields(self, inspected=None):
+        """Returns a list of all fields that have explicitly been changed.
+        """
+        EmbeddedDocument = _import_class("EmbeddedDocument")
+        DynamicEmbeddedDocument = _import_class("DynamicEmbeddedDocument")
+        ReferenceField = _import_class("ReferenceField")
+        _changed_fields = []
+        _changed_fields += getattr(self, '_changed_fields', [])
+
+        inspected = inspected or set()
+        if hasattr(self, 'id'):
+            if self.id in inspected:
+                return _changed_fields
+            inspected.add(self.id)
+
+        for field_name in self._fields_ordered:
+            db_field_name = self._db_field_map.get(field_name, field_name)
+            key = '%s.' % db_field_name
+            data = self._data.get(field_name, None)
+            field = self._fields.get(field_name)
+
+            if hasattr(data, 'id'):
+                if data.id in inspected:
+                    continue
+                inspected.add(data.id)
+            if isinstance(field, ReferenceField):
+                continue
+            elif (isinstance(data, (EmbeddedDocument, DynamicEmbeddedDocument))
+               and db_field_name not in _changed_fields):
+                 # Find all embedded fields that have been changed
+                changed = data._get_changed_fields(inspected)
+                _changed_fields += ["%s%s" % (key, k) for k in changed if k]
+            elif (isinstance(data, (list, tuple, dict)) and
+                    db_field_name not in _changed_fields):
+                # Loop list / dict fields as they contain documents
+                # Determine the iterator to use
+                if not hasattr(data, 'items'):
+                    iterator = enumerate(data)
+                else:
+                    iterator = data.iteritems()
+                for index, value in iterator:
+                    if not hasattr(value, '_get_changed_fields'):
+                        continue
+                    if (hasattr(field, 'field') and
+                        isinstance(field.field, ReferenceField)):
+                        continue
+                    list_key = "%s%s." % (key, index)
+                    changed = value._get_changed_fields(inspected)
+                    _changed_fields += ["%s%s" % (list_key, k)
+                                        for k in changed if k]
+        return _changed_fields
+
+    def _delta(self):
+        """Returns the delta (set, unset) of the changes for a document.
+        Gets any values that have been explicitly changed.
+        """
+        # Handles cases where not loaded from_son but has _id
+        doc = self.to_mongo()
+
+        set_fields = self._get_changed_fields()
+        unset_data = {}
+        parts = []
+        if hasattr(self, '_changed_fields'):
+            set_data = {}
+            # Fetch each set item from its path
+            for path in set_fields:
+                parts = path.split('.')
+                d = doc
+                new_path = []
+                for p in parts:
+                    if isinstance(d, (ObjectId, DBRef)):
+                        break
+                    elif isinstance(d, list) and p.isdigit():
+                        d = d[int(p)]
+                    elif hasattr(d, 'get'):
+                        d = d.get(p)
+                    new_path.append(p)
+                path = '.'.join(new_path)
+                set_data[path] = d
+        else:
+            set_data = doc
+            if '_id' in set_data:
+                del(set_data['_id'])
+
+        # Determine if any changed items were actually unset.
+        for path, value in set_data.items():
+            if value or isinstance(value, (numbers.Number, bool)):
+                continue
+
+            # If we've set a value that ain't the default value dont unset it.
+            default = None
+            if (self._dynamic and len(parts) and parts[0] in
+               self._dynamic_fields):
+                del(set_data[path])
+                unset_data[path] = 1
+                continue
+            elif path in self._fields:
+                default = self._fields[path].default
+            else:  # Perform a full lookup for lists / embedded lookups
+                d = self
+                parts = path.split('.')
+                db_field_name = parts.pop()
+                for p in parts:
+                    if isinstance(d, list) and p.isdigit():
+                        d = d[int(p)]
+                    elif (hasattr(d, '__getattribute__') and
+                          not isinstance(d, dict)):
+                        real_path = d._reverse_db_field_map.get(p, p)
+                        d = getattr(d, real_path)
+                    else:
+                        d = d.get(p)
+
+                if hasattr(d, '_fields'):
+                    field_name = d._reverse_db_field_map.get(db_field_name,
+                                                             db_field_name)
+                    if field_name in d._fields:
+                        default = d._fields.get(field_name).default
+                    else:
+                        default = None
+
+            if default is not None:
+                if callable(default):
+                    default = default()
+
+            if default != value:
+                continue
+
+            del(set_data[path])
+            unset_data[path] = 1
+        return set_data, unset_data
+
+    @classmethod
+    def _get_collection_name(cls):
+        """Returns the collection name for this class.
+        """
+        return cls._meta.get('collection', None)
+
+    @classmethod
+    def _from_son(cls, son, _auto_dereference=True):
+        """Create an instance of a Document (subclass) from a PyMongo SON.
+        """
+
+        # get the class name from the document, falling back to the given
+        # class if unavailable
+        class_name = son.get('_cls', cls._class_name)
+        data = dict(("%s" % key, value) for key, value in son.iteritems())
+        if not UNICODE_KWARGS:
+            # python 2.6.4 and lower cannot handle unicode keys
+            # passed to class constructor example: cls(**data)
+            to_str_keys_recursive(data)
+
+        # Return correct subclass for document type
+        if class_name != cls._class_name:
+            cls = get_document(class_name)
+
+        changed_fields = []
+        errors_dict = {}
+
+        fields = cls._fields
+        if not _auto_dereference:
+            fields = copy.copy(fields)
+
+        for field_name, field in fields.iteritems():
+            field._auto_dereference = _auto_dereference
+            if field.db_field in data:
+                value = data[field.db_field]
+                try:
+                    data[field_name] = (value if value is None
+                                        else field.to_python(value))
+                    if field_name != field.db_field:
+                        del data[field.db_field]
+                except (AttributeError, ValueError), e:
+                    errors_dict[field_name] = e
+            elif field.default:
+                default = field.default
+                if callable(default):
+                    default = default()
+                if isinstance(default, BaseDocument):
+                    changed_fields.append(field_name)
+
+        if errors_dict:
+            errors = "\n".join(["%s - %s" % (k, v)
+                     for k, v in errors_dict.items()])
+            msg = ("Invalid data to create a `%s` instance.\n%s"
+                   % (cls._class_name, errors))
+            raise InvalidDocumentError(msg)
+
+        obj = cls(__auto_convert=False, **data)
+        obj._changed_fields = changed_fields
+        obj._created = False
+        if not _auto_dereference:
+            obj._fields = fields
+        return obj
+
+    @classmethod
+    def _build_index_specs(cls, meta_indexes):
+        """Generate and merge the full index specs
+        """
+
+        geo_indices = cls._geo_indices()
+        unique_indices = cls._unique_with_indexes()
+        index_specs = [cls._build_index_spec(spec)
+                       for spec in meta_indexes]
+
+        def merge_index_specs(index_specs, indices):
+            if not indices:
+                return index_specs
+
+            spec_fields = [v['fields']
+                           for k, v in enumerate(index_specs)]
+            # Merge unqiue_indexes with existing specs
+            for k, v in enumerate(indices):
+                if v['fields'] in spec_fields:
+                    index_specs[spec_fields.index(v['fields'])].update(v)
+                else:
+                    index_specs.append(v)
+            return index_specs
+
+        index_specs = merge_index_specs(index_specs, geo_indices)
+        index_specs = merge_index_specs(index_specs, unique_indices)
+        return index_specs
+
+    @classmethod
+    def _build_index_spec(cls, spec):
+        """Build a PyMongo index spec from a MongoEngine index spec.
+        """
+        if isinstance(spec, basestring):
+            spec = {'fields': [spec]}
+        elif isinstance(spec, (list, tuple)):
+            spec = {'fields': list(spec)}
+        elif isinstance(spec, dict):
+            spec = dict(spec)
+
+        index_list = []
+        direction = None
+
+        # Check to see if we need to include _cls
+        allow_inheritance = cls._meta.get('allow_inheritance',
+                                          ALLOW_INHERITANCE)
+        include_cls = (allow_inheritance and not spec.get('sparse', False) and
+                       spec.get('cls',  True))
+        if "cls" in spec:
+            spec.pop('cls')
+        for key in spec['fields']:
+            # If inherited spec continue
+            if isinstance(key, (list, tuple)):
+                continue
+
+            # ASCENDING from +,
+            # DESCENDING from -
+            # GEO2D from *
+            direction = pymongo.ASCENDING
+            if key.startswith("-"):
+                direction = pymongo.DESCENDING
+            elif key.startswith("*"):
+                direction = pymongo.GEO2D
+            if key.startswith(("+", "-", "*")):
+                key = key[1:]
+
+            # Use real field name, do it manually because we need field
+            # objects for the next part (list field checking)
+            parts = key.split('.')
+            if parts in (['pk'], ['id'], ['_id']):
+                key = '_id'
+                fields = []
+            else:
+                fields = cls._lookup_field(parts)
+                parts = [field if field == '_id' else field.db_field
+                         for field in fields]
+                key = '.'.join(parts)
+            index_list.append((key, direction))
+
+        # Don't add cls to a geo index
+        if include_cls and direction is not pymongo.GEO2D:
+            index_list.insert(0, ('_cls', 1))
+
+        if index_list:
+            spec['fields'] = index_list
+        if spec.get('sparse', False) and len(spec['fields']) > 1:
+            raise ValueError(
+                'Sparse indexes can only have one field in them. '
+                'See https://jira.mongodb.org/browse/SERVER-2193')
+
+        return spec
+
+    @classmethod
+    def _unique_with_indexes(cls, namespace=""):
+        """
+        Find and set unique indexes
+        """
+        unique_indexes = []
+        for field_name, field in cls._fields.items():
+            sparse = False
+            # Generate a list of indexes needed by uniqueness constraints
+            if field.unique:
+                field.required = True
+                unique_fields = [field.db_field]
+
+                # Add any unique_with fields to the back of the index spec
+                if field.unique_with:
+                    if isinstance(field.unique_with, basestring):
+                        field.unique_with = [field.unique_with]
+
+                    # Convert unique_with field names to real field names
+                    unique_with = []
+                    for other_name in field.unique_with:
+                        parts = other_name.split('.')
+                        # Lookup real name
+                        parts = cls._lookup_field(parts)
+                        name_parts = [part.db_field for part in parts]
+                        unique_with.append('.'.join(name_parts))
+                        # Unique field should be required
+                        parts[-1].required = True
+                        sparse = (not sparse and
+                                  parts[-1].name not in cls.__dict__)
+                    unique_fields += unique_with
+
+                # Add the new index to the list
+                fields = [("%s%s" % (namespace, f), pymongo.ASCENDING)
+                          for f in unique_fields]
+                index = {'fields': fields, 'unique': True, 'sparse': sparse}
+                unique_indexes.append(index)
+
+            # Grab any embedded document field unique indexes
+            if (field.__class__.__name__ == "EmbeddedDocumentField" and
+               field.document_type != cls):
+                field_namespace = "%s." % field_name
+                doc_cls = field.document_type
+                unique_indexes += doc_cls._unique_with_indexes(field_namespace)
+
+        return unique_indexes
+
+    @classmethod
+    def _geo_indices(cls, inspected=None, parent_field=None):
+        inspected = inspected or []
+        geo_indices = []
+        inspected.append(cls)
+
+        geo_field_type_names = ["EmbeddedDocumentField", "GeoPointField",
+                                "PointField", "LineStringField", "PolygonField"]
+
+        geo_field_types = tuple([_import_class(field) for field in geo_field_type_names])
+
+        for field in cls._fields.values():
+            if not isinstance(field, geo_field_types):
+                continue
+            if hasattr(field, 'document_type'):
+                field_cls = field.document_type
+                if field_cls in inspected:
+                    continue
+                if hasattr(field_cls, '_geo_indices'):
+                    geo_indices += field_cls._geo_indices(inspected, parent_field=field.db_field)
+            elif field._geo_index:
+                field_name = field.db_field
+                if parent_field:
+                    field_name = "%s.%s" % (parent_field, field_name)
+                geo_indices.append({'fields':
+                                   [(field_name, field._geo_index)]})
+        return geo_indices
+
+    @classmethod
+    def _lookup_field(cls, parts):
+        """Lookup a field based on its attribute and return a list containing
+        the field's parents and the field.
+        """
+        if not isinstance(parts, (list, tuple)):
+            parts = [parts]
+        fields = []
+        field = None
+
+        for field_name in parts:
+            # Handle ListField indexing:
+            if field_name.isdigit() and hasattr(field, 'field'):
+                new_field = field.field
+                fields.append(field_name)
+                continue
+
+            if field is None:
+                # Look up first field from the document
+                if field_name == 'pk':
+                    # Deal with "primary key" alias
+                    field_name = cls._meta['id_field']
+                if field_name in cls._fields:
+                    field = cls._fields[field_name]
+                elif cls._dynamic:
+                    DynamicField = _import_class('DynamicField')
+                    field = DynamicField(db_field=field_name)
+                else:
+                    raise LookUpError('Cannot resolve field "%s"'
+                                      % field_name)
+            else:
+                ReferenceField = _import_class('ReferenceField')
+                GenericReferenceField = _import_class('GenericReferenceField')
+                if isinstance(field, (ReferenceField, GenericReferenceField)):
+                    raise LookUpError('Cannot perform join in mongoDB: %s' %
+                                      '__'.join(parts))
+                if hasattr(getattr(field, 'field', None), 'lookup_member'):
+                    new_field = field.field.lookup_member(field_name)
+                else:
+                   # Look up subfield on the previous field
+                    new_field = field.lookup_member(field_name)
+                if not new_field and isinstance(field, ComplexBaseField):
+                    fields.append(field_name)
+                    continue
+                elif not new_field:
+                    raise LookUpError('Cannot resolve field "%s"'
+                                      % field_name)
+                field = new_field  # update field to the new field type
+            fields.append(field)
+        return fields
+
+    @classmethod
+    def _translate_field_name(cls, field, sep='.'):
+        """Translate a field attribute name to a database field name.
+        """
+        parts = field.split(sep)
+        parts = [f.db_field for f in cls._lookup_field(parts)]
+        return '.'.join(parts)
+
+    def __set_field_display(self):
+        """Dynamically set the display value for a field with choices"""
+        for attr_name, field in self._fields.items():
+            if field.choices:
+                setattr(self,
+                        'get_%s_display' % attr_name,
+                        partial(self.__get_field_display, field=field))
+
+    def __get_field_display(self, field):
+        """Returns the display value for a choice field"""
+        value = getattr(self, field.name)
+        if field.choices and isinstance(field.choices[0], (list, tuple)):
+            return dict(field.choices).get(value, value)
+        return value

mongoengine/base/fields.py

@@ -0,0 +1,509 @@
+import operator
+import warnings
+import weakref
+
+from bson import DBRef, ObjectId, SON
+import pymongo
+
+from mongoengine.common import _import_class
+from mongoengine.errors import ValidationError
+
+from mongoengine.base.common import ALLOW_INHERITANCE
+from mongoengine.base.datastructures import BaseDict, BaseList
+
+__all__ = ("BaseField", "ComplexBaseField", "ObjectIdField", "GeoJsonBaseField")
+
+
+class BaseField(object):
+    """A base class for fields in a MongoDB document. Instances of this class
+    may be added to subclasses of `Document` to define a document's schema.
+
+    .. versionchanged:: 0.5 - added verbose and help text
+    """
+
+    name = None
+    _geo_index = False
+    _auto_gen = False  # Call `generate` to generate a value
+    _auto_dereference = True
+
+    # These track each time a Field instance is created. Used to retain order.
+    # The auto_creation_counter is used for fields that MongoEngine implicitly
+    # creates, creation_counter is used for all user-specified fields.
+    creation_counter = 0
+    auto_creation_counter = -1
+
+    def __init__(self, db_field=None, name=None, required=False, default=None,
+                 unique=False, unique_with=None, primary_key=False,
+                 validation=None, choices=None, verbose_name=None,
+                 help_text=None):
+        """
+        :param db_field: The database field to store this field in
+            (defaults to the name of the field)
+        :param name: Depreciated - use db_field
+        :param required: If the field is required. Whether it has to have a
+            value or not. Defaults to False.
+        :param default: (optional) The default value for this field if no value
+            has been set (or if the value has been unset).  It Can be a
+            callable.
+        :param unique: Is the field value unique or not.  Defaults to False.
+        :param unique_with: (optional) The other field this field should be
+            unique with.
+        :param primary_key: Mark this field as the primary key. Defaults to False.
+        :param validation: (optional) A callable to validate the value of the
+            field.  Generally this is deprecated in favour of the
+            `FIELD.validate` method
+        :param choices: (optional) The valid choices
+        :param verbose_name: (optional)  The verbose name for the field.
+            Designed to be human readable and is often used when generating
+            model forms from the document model.
+        :param help_text: (optional) The help text for this field and is often
+            used when generating model forms from the document model.
+        """
+        self.db_field = (db_field or name) if not primary_key else '_id'
+        if name:
+            msg = "Fields' 'name' attribute deprecated in favour of 'db_field'"
+            warnings.warn(msg, DeprecationWarning)
+        self.required = required or primary_key
+        self.default = default
+        self.unique = bool(unique or unique_with)
+        self.unique_with = unique_with
+        self.primary_key = primary_key
+        self.validation = validation
+        self.choices = choices
+        self.verbose_name = verbose_name
+        self.help_text = help_text
+
+        # Adjust the appropriate creation counter, and save our local copy.
+        if self.db_field == '_id':
+            self.creation_counter = BaseField.auto_creation_counter
+            BaseField.auto_creation_counter -= 1
+        else:
+            self.creation_counter = BaseField.creation_counter
+            BaseField.creation_counter += 1
+
+    def __get__(self, instance, owner):
+        """Descriptor for retrieving a value from a field in a document.
+        """
+        if instance is None:
+            # Document class being used rather than a document object
+            return self
+
+        # Get value from document instance if available
+        value = instance._data.get(self.name)
+
+        EmbeddedDocument = _import_class('EmbeddedDocument')
+        if isinstance(value, EmbeddedDocument) and value._instance is None:
+            value._instance = weakref.proxy(instance)
+        return value
+
+    def __set__(self, instance, value):
+        """Descriptor for assigning a value to a field in a document.
+        """
+
+        # If setting to None and theres a default
+        # Then set the value to the default value
+        if value is None and self.default is not None:
+            value = self.default
+            if callable(value):
+                value = value()
+
+        if instance._initialised:
+            try:
+                if (self.name not in instance._data or
+                   instance._data[self.name] != value):
+                    instance._mark_as_changed(self.name)
+            except:
+                # Values cant be compared eg: naive and tz datetimes
+                # So mark it as changed
+                instance._mark_as_changed(self.name)
+        instance._data[self.name] = value
+
+    def error(self, message="", errors=None, field_name=None):
+        """Raises a ValidationError.
+        """
+        field_name = field_name if field_name else self.name
+        raise ValidationError(message, errors=errors, field_name=field_name)
+
+    def to_python(self, value):
+        """Convert a MongoDB-compatible type to a Python type.
+        """
+        return value
+
+    def to_mongo(self, value):
+        """Convert a Python type to a MongoDB-compatible type.
+        """
+        return self.to_python(value)
+
+    def prepare_query_value(self, op, value):
+        """Prepare a value that is being used in a query for PyMongo.
+        """
+        return value
+
+    def validate(self, value, clean=True):
+        """Perform validation on a value.
+        """
+        pass
+
+    def _validate(self, value, **kwargs):
+        Document = _import_class('Document')
+        EmbeddedDocument = _import_class('EmbeddedDocument')
+        # check choices
+        if self.choices:
+            is_cls = isinstance(value, (Document, EmbeddedDocument))
+            value_to_check = value.__class__ if is_cls else value
+            err_msg = 'an instance' if is_cls else 'one'
+            if isinstance(self.choices[0], (list, tuple)):
+                option_keys = [k for k, v in self.choices]
+                if value_to_check not in option_keys:
+                    msg = ('Value must be %s of %s' %
+                           (err_msg, unicode(option_keys)))
+                    self.error(msg)
+            elif value_to_check not in self.choices:
+                msg = ('Value must be %s of %s' %
+                       (err_msg, unicode(self.choices)))
+                self.error(msg)
+
+        # check validation argument
+        if self.validation is not None:
+            if callable(self.validation):
+                if not self.validation(value):
+                    self.error('Value does not match custom validation method')
+            else:
+                raise ValueError('validation argument for "%s" must be a '
+                                 'callable.' % self.name)
+
+        self.validate(value, **kwargs)
+
+
+class ComplexBaseField(BaseField):
+    """Handles complex fields, such as lists / dictionaries.
+
+    Allows for nesting of embedded documents inside complex types.
+    Handles the lazy dereferencing of a queryset by lazily dereferencing all
+    items in a list / dict rather than one at a time.
+
+    .. versionadded:: 0.5
+    """
+
+    field = None
+
+    def __get__(self, instance, owner):
+        """Descriptor to automatically dereference references.
+        """
+        if instance is None:
+            # Document class being used rather than a document object
+            return self
+
+        ReferenceField = _import_class('ReferenceField')
+        GenericReferenceField = _import_class('GenericReferenceField')
+        dereference = (self._auto_dereference and
+                       (self.field is None or isinstance(self.field,
+                        (GenericReferenceField, ReferenceField))))
+
+        _dereference = _import_class("DeReference")()
+
+        self._auto_dereference = instance._fields[self.name]._auto_dereference
+        if instance._initialised and dereference:
+            instance._data[self.name] = _dereference(
+                instance._data.get(self.name), max_depth=1, instance=instance,
+                name=self.name
+            )
+
+        value = super(ComplexBaseField, self).__get__(instance, owner)
+
+        # Convert lists / values so we can watch for any changes on them
+        if (isinstance(value, (list, tuple)) and
+           not isinstance(value, BaseList)):
+            value = BaseList(value, instance, self.name)
+            instance._data[self.name] = value
+        elif isinstance(value, dict) and not isinstance(value, BaseDict):
+            value = BaseDict(value, instance, self.name)
+            instance._data[self.name] = value
+
+        if (self._auto_dereference and instance._initialised and
+           isinstance(value, (BaseList, BaseDict))
+           and not value._dereferenced):
+            value = _dereference(
+                value, max_depth=1, instance=instance, name=self.name
+            )
+            value._dereferenced = True
+            instance._data[self.name] = value
+
+        return value
+
+    def to_python(self, value):
+        """Convert a MongoDB-compatible type to a Python type.
+        """
+        Document = _import_class('Document')
+
+        if isinstance(value, basestring):
+            return value
+
+        if hasattr(value, 'to_python'):
+            return value.to_python()
+
+        is_list = False
+        if not hasattr(value, 'items'):
+            try:
+                is_list = True
+                value = dict([(k, v) for k, v in enumerate(value)])
+            except TypeError:  # Not iterable return the value
+                return value
+
+        if self.field:
+            value_dict = dict([(key, self.field.to_python(item))
+                               for key, item in value.items()])
+        else:
+            value_dict = {}
+            for k, v in value.items():
+                if isinstance(v, Document):
+                    # We need the id from the saved object to create the DBRef
+                    if v.pk is None:
+                        self.error('You can only reference documents once they'
+                                   ' have been saved to the database')
+                    collection = v._get_collection_name()
+                    value_dict[k] = DBRef(collection, v.pk)
+                elif hasattr(v, 'to_python'):
+                    value_dict[k] = v.to_python()
+                else:
+                    value_dict[k] = self.to_python(v)
+
+        if is_list:  # Convert back to a list
+            return [v for k, v in sorted(value_dict.items(),
+                                         key=operator.itemgetter(0))]
+        return value_dict
+
+    def to_mongo(self, value):
+        """Convert a Python type to a MongoDB-compatible type.
+        """
+        Document = _import_class("Document")
+        EmbeddedDocument = _import_class("EmbeddedDocument")
+        GenericReferenceField = _import_class("GenericReferenceField")
+
+        if isinstance(value, basestring):
+            return value
+
+        if hasattr(value, 'to_mongo'):
+            if isinstance(value, Document):
+                return GenericReferenceField().to_mongo(value)
+            cls = value.__class__
+            val = value.to_mongo()
+            # If we its a document thats not inherited add _cls
+            if (isinstance(value, EmbeddedDocument)):
+                val['_cls'] = cls.__name__
+            return val
+
+        is_list = False
+        if not hasattr(value, 'items'):
+            try:
+                is_list = True
+                value = dict([(k, v) for k, v in enumerate(value)])
+            except TypeError:  # Not iterable return the value
+                return value
+
+        if self.field:
+            value_dict = dict([(key, self.field.to_mongo(item))
+                               for key, item in value.iteritems()])
+        else:
+            value_dict = {}
+            for k, v in value.iteritems():
+                if isinstance(v, Document):
+                    # We need the id from the saved object to create the DBRef
+                    if v.pk is None:
+                        self.error('You can only reference documents once they'
+                                   ' have been saved to the database')
+
+                    # If its a document that is not inheritable it won't have
+                    # any _cls data so make it a generic reference allows
+                    # us to dereference
+                    meta = getattr(v, '_meta', {})
+                    allow_inheritance = (
+                        meta.get('allow_inheritance', ALLOW_INHERITANCE)
+                        is True)
+                    if not allow_inheritance and not self.field:
+                        value_dict[k] = GenericReferenceField().to_mongo(v)
+                    else:
+                        collection = v._get_collection_name()
+                        value_dict[k] = DBRef(collection, v.pk)
+                elif hasattr(v, 'to_mongo'):
+                    cls = v.__class__
+                    val = v.to_mongo()
+                    # If we its a document thats not inherited add _cls
+                    if (isinstance(v, (Document, EmbeddedDocument))):
+                        val['_cls'] = cls.__name__
+                    value_dict[k] = val
+                else:
+                    value_dict[k] = self.to_mongo(v)
+
+        if is_list:  # Convert back to a list
+            return [v for k, v in sorted(value_dict.items(),
+                                         key=operator.itemgetter(0))]
+        return value_dict
+
+    def validate(self, value):
+        """If field is provided ensure the value is valid.
+        """
+        errors = {}
+        if self.field:
+            if hasattr(value, 'iteritems') or hasattr(value, 'items'):
+                sequence = value.iteritems()
+            else:
+                sequence = enumerate(value)
+            for k, v in sequence:
+                try:
+                    self.field._validate(v)
+                except ValidationError, error:
+                    errors[k] = error.errors or error
+                except (ValueError, AssertionError), error:
+                    errors[k] = error
+
+            if errors:
+                field_class = self.field.__class__.__name__
+                self.error('Invalid %s item (%s)' % (field_class, value),
+                           errors=errors)
+        # Don't allow empty values if required
+        if self.required and not value:
+            self.error('Field is required and cannot be empty')
+
+    def prepare_query_value(self, op, value):
+        return self.to_mongo(value)
+
+    def lookup_member(self, member_name):
+        if self.field:
+            return self.field.lookup_member(member_name)
+        return None
+
+    def _set_owner_document(self, owner_document):
+        if self.field:
+            self.field.owner_document = owner_document
+        self._owner_document = owner_document
+
+    def _get_owner_document(self, owner_document):
+        self._owner_document = owner_document
+
+    owner_document = property(_get_owner_document, _set_owner_document)
+
+
+class ObjectIdField(BaseField):
+    """A field wrapper around MongoDB's ObjectIds.
+    """
+
+    def to_python(self, value):
+        if not isinstance(value, ObjectId):
+            value = ObjectId(value)
+        return value
+
+    def to_mongo(self, value):
+        if not isinstance(value, ObjectId):
+            try:
+                return ObjectId(unicode(value))
+            except Exception, e:
+                # e.message attribute has been deprecated since Python 2.6
+                self.error(unicode(e))
+        return value
+
+    def prepare_query_value(self, op, value):
+        return self.to_mongo(value)
+
+    def validate(self, value):
+        try:
+            ObjectId(unicode(value))
+        except:
+            self.error('Invalid Object ID')
+
+
+class GeoJsonBaseField(BaseField):
+    """A geo json field storing a geojson style object.
+    .. versionadded:: 0.8
+    """
+
+    _geo_index = pymongo.GEOSPHERE
+    _type = "GeoBase"
+
+    def __init__(self, auto_index=True, *args, **kwargs):
+        """
+        :param auto_index: Automatically create a "2dsphere" index. Defaults
+            to `True`.
+        """
+        self._name = "%sField" % self._type
+        if not auto_index:
+            self._geo_index = False
+        super(GeoJsonBaseField, self).__init__(*args, **kwargs)
+
+    def validate(self, value):
+        """Validate the GeoJson object based on its type
+        """
+        if isinstance(value, dict):
+            if set(value.keys()) == set(['type', 'coordinates']):
+                if value['type'] != self._type:
+                    self.error('%s type must be "%s"' % (self._name, self._type))
+                return self.validate(value['coordinates'])
+            else:
+                self.error('%s can only accept a valid GeoJson dictionary'
+                           ' or lists of (x, y)' % self._name)
+                return
+        elif not isinstance(value, (list, tuple)):
+            self.error('%s can only accept lists of [x, y]' % self._name)
+            return
+
+        validate = getattr(self, "_validate_%s" % self._type.lower())
+        error = validate(value)
+        if error:
+            self.error(error)
+
+    def _validate_polygon(self, value):
+        if not isinstance(value, (list, tuple)):
+            return 'Polygons must contain list of linestrings'
+
+        # Quick and dirty validator
+        try:
+            value[0][0][0]
+        except:
+            return "Invalid Polygon must contain at least one valid linestring"
+
+        errors = []
+        for val in value:
+            error = self._validate_linestring(val, False)
+            if not error and val[0] != val[-1]:
+                error = 'LineStrings must start and end at the same point'
+            if error and error not in errors:
+                errors.append(error)
+        if errors:
+            return "Invalid Polygon:\n%s" % ", ".join(errors)
+
+    def _validate_linestring(self, value, top_level=True):
+        """Validates a linestring"""
+        if not isinstance(value, (list, tuple)):
+            return 'LineStrings must contain list of coordinate pairs'
+
+        # Quick and dirty validator
+        try:
+            value[0][0]
+        except:
+            return "Invalid LineString must contain at least one valid point"
+
+        errors = []
+        for val in value:
+            error = self._validate_point(val)
+            if error and error not in errors:
+                errors.append(error)
+        if errors:
+            if top_level:
+                return "Invalid LineString:\n%s" % ", ".join(errors)
+            else:
+                return "%s" % ", ".join(errors)
+
+    def _validate_point(self, value):
+        """Validate each set of coords"""
+        if not isinstance(value, (list, tuple)):
+            return 'Points must be a list of coordinate pairs'
+        elif not len(value) == 2:
+            return "Value (%s) must be a two-dimensional point" % repr(value)
+        elif (not isinstance(value[0], (float, int)) or
+              not isinstance(value[1], (float, int))):
+            return "Both values (%s) in point must be float or int" % repr(value)
+
+    def to_mongo(self, value):
+        if isinstance(value, dict):
+            return value
+        return SON([("type", self._type), ("coordinates", value)])

mongoengine/base/metaclasses.py

@@ -0,0 +1,404 @@
+import warnings
+
+import pymongo
+
+from mongoengine.common import _import_class
+from mongoengine.errors import InvalidDocumentError
+from mongoengine.python_support import PY3
+from mongoengine.queryset import (DO_NOTHING, DoesNotExist,
+                                  MultipleObjectsReturned,
+                                  QuerySet, QuerySetManager)
+
+from mongoengine.base.common import _document_registry, ALLOW_INHERITANCE
+from mongoengine.base.fields import BaseField, ComplexBaseField, ObjectIdField
+
+__all__ = ('DocumentMetaclass', 'TopLevelDocumentMetaclass')
+
+
+class DocumentMetaclass(type):
+    """Metaclass for all documents.
+    """
+
+    def __new__(cls, name, bases, attrs):
+        flattened_bases = cls._get_bases(bases)
+        super_new = super(DocumentMetaclass, cls).__new__
+
+        # If a base class just call super
+        metaclass = attrs.get('my_metaclass')
+        if metaclass and issubclass(metaclass, DocumentMetaclass):
+            return super_new(cls, name, bases, attrs)
+
+        attrs['_is_document'] = attrs.get('_is_document', False)
+
+        # EmbeddedDocuments could have meta data for inheritance
+        if 'meta' in attrs:
+            attrs['_meta'] = attrs.pop('meta')
+
+        # EmbeddedDocuments should inherit meta data
+        if '_meta' not in attrs:
+            meta = MetaDict()
+            for base in flattened_bases[::-1]:
+                # Add any mixin metadata from plain objects
+                if hasattr(base, 'meta'):
+                    meta.merge(base.meta)
+                elif hasattr(base, '_meta'):
+                    meta.merge(base._meta)
+            attrs['_meta'] = meta
+
+        # Handle document Fields
+
+        # Merge all fields from subclasses
+        doc_fields = {}
+        for base in flattened_bases[::-1]:
+            if hasattr(base, '_fields'):
+                doc_fields.update(base._fields)
+
+            # Standard object mixin - merge in any Fields
+            if not hasattr(base, '_meta'):
+                base_fields = {}
+                for attr_name, attr_value in base.__dict__.iteritems():
+                    if not isinstance(attr_value, BaseField):
+                        continue
+                    attr_value.name = attr_name
+                    if not attr_value.db_field:
+                        attr_value.db_field = attr_name
+                    base_fields[attr_name] = attr_value
+
+                doc_fields.update(base_fields)
+
+        # Discover any document fields
+        field_names = {}
+        for attr_name, attr_value in attrs.iteritems():
+            if not isinstance(attr_value, BaseField):
+                continue
+            attr_value.name = attr_name
+            if not attr_value.db_field:
+                attr_value.db_field = attr_name
+            doc_fields[attr_name] = attr_value
+
+            # Count names to ensure no db_field redefinitions
+            field_names[attr_value.db_field] = field_names.get(
+                attr_value.db_field, 0) + 1
+
+        # Ensure no duplicate db_fields
+        duplicate_db_fields = [k for k, v in field_names.items() if v > 1]
+        if duplicate_db_fields:
+            msg = ("Multiple db_fields defined for: %s " %
+                   ", ".join(duplicate_db_fields))
+            raise InvalidDocumentError(msg)
+
+        # Set _fields and db_field maps
+        attrs['_fields'] = doc_fields
+        attrs['_db_field_map'] = dict([(k, getattr(v, 'db_field', k))
+                                      for k, v in doc_fields.iteritems()])
+        attrs['_reverse_db_field_map'] = dict(
+            (v, k) for k, v in attrs['_db_field_map'].iteritems())
+
+        attrs['_fields_ordered'] = tuple(i[1] for i in sorted(
+                                         (v.creation_counter, v.name)
+                                         for v in doc_fields.itervalues()))
+
+        #
+        # Set document hierarchy
+        #
+        superclasses = ()
+        class_name = [name]
+        for base in flattened_bases:
+            if (not getattr(base, '_is_base_cls', True) and
+               not getattr(base, '_meta', {}).get('abstract', True)):
+                # Collate heirarchy for _cls and _subclasses
+                class_name.append(base.__name__)
+
+            if hasattr(base, '_meta'):
+                # Warn if allow_inheritance isn't set and prevent
+                # inheritance of classes where inheritance is set to False
+                allow_inheritance = base._meta.get('allow_inheritance',
+                                                   ALLOW_INHERITANCE)
+                if (allow_inheritance is not True and
+                   not base._meta.get('abstract')):
+                    raise ValueError('Document %s may not be subclassed' %
+                                     base.__name__)
+
+        # Get superclasses from last base superclass
+        document_bases = [b for b in flattened_bases
+                          if hasattr(b, '_class_name')]
+        if document_bases:
+            superclasses = document_bases[0]._superclasses
+            superclasses += (document_bases[0]._class_name, )
+
+        _cls = '.'.join(reversed(class_name))
+        attrs['_class_name'] = _cls
+        attrs['_superclasses'] = superclasses
+        attrs['_subclasses'] = (_cls, )
+        attrs['_types'] = attrs['_subclasses']  # TODO depreciate _types
+
+        # Create the new_class
+        new_class = super_new(cls, name, bases, attrs)
+
+        # Set _subclasses
+        for base in document_bases:
+            if _cls not in base._subclasses:
+                base._subclasses += (_cls,)
+            base._types = base._subclasses   # TODO depreciate _types
+
+        Document, EmbeddedDocument, DictField = cls._import_classes()
+
+        if issubclass(new_class, Document):
+            new_class._collection = None
+
+        # Add class to the _document_registry
+        _document_registry[new_class._class_name] = new_class
+
+        # In Python 2, User-defined methods objects have special read-only
+        # attributes 'im_func' and 'im_self' which contain the function obj
+        # and class instance object respectively.  With Python 3 these special
+        # attributes have been replaced by __func__ and __self__.  The Blinker
+        # module continues to use im_func and im_self, so the code below
+        # copies __func__ into im_func and __self__ into im_self for
+        # classmethod objects in Document derived classes.
+        if PY3:
+            for key, val in new_class.__dict__.items():
+                if isinstance(val, classmethod):
+                    f = val.__get__(new_class)
+                    if hasattr(f, '__func__') and not hasattr(f, 'im_func'):
+                        f.__dict__.update({'im_func': getattr(f, '__func__')})
+                    if hasattr(f, '__self__') and not hasattr(f, 'im_self'):
+                        f.__dict__.update({'im_self': getattr(f, '__self__')})
+
+        # Handle delete rules
+        for field in new_class._fields.itervalues():
+            f = field
+            f.owner_document = new_class
+            delete_rule = getattr(f, 'reverse_delete_rule', DO_NOTHING)
+            if isinstance(f, ComplexBaseField) and hasattr(f, 'field'):
+                delete_rule = getattr(f.field,
+                                      'reverse_delete_rule',
+                                      DO_NOTHING)
+                if isinstance(f, DictField) and delete_rule != DO_NOTHING:
+                    msg = ("Reverse delete rules are not supported "
+                           "for %s (field: %s)" %
+                           (field.__class__.__name__, field.name))
+                    raise InvalidDocumentError(msg)
+
+                f = field.field
+
+            if delete_rule != DO_NOTHING:
+                if issubclass(new_class, EmbeddedDocument):
+                    msg = ("Reverse delete rules are not supported for "
+                           "EmbeddedDocuments (field: %s)" % field.name)
+                    raise InvalidDocumentError(msg)
+                f.document_type.register_delete_rule(new_class,
+                                                     field.name, delete_rule)
+
+            if (field.name and hasattr(Document, field.name) and
+               EmbeddedDocument not in new_class.mro()):
+                msg = ("%s is a document method and not a valid "
+                       "field name" % field.name)
+                raise InvalidDocumentError(msg)
+
+        return new_class
+
+    def add_to_class(self, name, value):
+        setattr(self, name, value)
+
+    @classmethod
+    def _get_bases(cls, bases):
+        if isinstance(bases, BasesTuple):
+            return bases
+        seen = []
+        bases = cls.__get_bases(bases)
+        unique_bases = (b for b in bases if not (b in seen or seen.append(b)))
+        return BasesTuple(unique_bases)
+
+    @classmethod
+    def __get_bases(cls, bases):
+        for base in bases:
+            if base is object:
+                continue
+            yield base
+            for child_base in cls.__get_bases(base.__bases__):
+                yield child_base
+
+    @classmethod
+    def _import_classes(cls):
+        Document = _import_class('Document')
+        EmbeddedDocument = _import_class('EmbeddedDocument')
+        DictField = _import_class('DictField')
+        return (Document, EmbeddedDocument, DictField)
+
+
+class TopLevelDocumentMetaclass(DocumentMetaclass):
+    """Metaclass for top-level documents (i.e. documents that have their own
+    collection in the database.
+    """
+
+    def __new__(cls, name, bases, attrs):
+        flattened_bases = cls._get_bases(bases)
+        super_new = super(TopLevelDocumentMetaclass, cls).__new__
+
+        # Set default _meta data if base class, otherwise get user defined meta
+        if (attrs.get('my_metaclass') == TopLevelDocumentMetaclass):
+            # defaults
+            attrs['_meta'] = {
+                'abstract': True,
+                'max_documents': None,
+                'max_size': None,
+                'ordering': [],  # default ordering applied at runtime
+                'indexes': [],  # indexes to be ensured at runtime
+                'id_field': None,
+                'index_background': False,
+                'index_drop_dups': False,
+                'index_opts': None,
+                'delete_rules': None,
+                'allow_inheritance': None,
+            }
+            attrs['_is_base_cls'] = True
+            attrs['_meta'].update(attrs.get('meta', {}))
+        else:
+            attrs['_meta'] = attrs.get('meta', {})
+            # Explictly set abstract to false unless set
+            attrs['_meta']['abstract'] = attrs['_meta'].get('abstract', False)
+            attrs['_is_base_cls'] = False
+
+        # Set flag marking as document class - as opposed to an object mixin
+        attrs['_is_document'] = True
+
+        # Ensure queryset_class is inherited
+        if 'objects' in attrs:
+            manager = attrs['objects']
+            if hasattr(manager, 'queryset_class'):
+                attrs['_meta']['queryset_class'] = manager.queryset_class
+
+        # Clean up top level meta
+        if 'meta' in attrs:
+            del(attrs['meta'])
+
+        # Find the parent document class
+        parent_doc_cls = [b for b in flattened_bases
+                        if b.__class__ == TopLevelDocumentMetaclass]
+        parent_doc_cls = None if not parent_doc_cls else parent_doc_cls[0]
+
+        # Prevent classes setting collection different to their parents
+        # If parent wasn't an abstract class
+        if (parent_doc_cls and 'collection' in attrs.get('_meta', {})
+            and not parent_doc_cls._meta.get('abstract', True)):
+                msg = "Trying to set a collection on a subclass (%s)" % name
+                warnings.warn(msg, SyntaxWarning)
+                del(attrs['_meta']['collection'])
+
+        # Ensure abstract documents have abstract bases
+        if attrs.get('_is_base_cls') or attrs['_meta'].get('abstract'):
+            if (parent_doc_cls and
+                not parent_doc_cls._meta.get('abstract', False)):
+                msg = "Abstract document cannot have non-abstract base"
+                raise ValueError(msg)
+            return super_new(cls, name, bases, attrs)
+
+        # Merge base class metas.
+        # Uses a special MetaDict that handles various merging rules
+        meta = MetaDict()
+        for base in flattened_bases[::-1]:
+            # Add any mixin metadata from plain objects
+            if hasattr(base, 'meta'):
+                meta.merge(base.meta)
+            elif hasattr(base, '_meta'):
+                meta.merge(base._meta)
+
+            # Set collection in the meta if its callable
+            if (getattr(base, '_is_document', False) and
+                not base._meta.get('abstract')):
+                collection = meta.get('collection', None)
+                if callable(collection):
+                    meta['collection'] = collection(base)
+
+        meta.merge(attrs.get('_meta', {}))  # Top level meta
+
+        # Only simple classes (direct subclasses of Document)
+        # may set allow_inheritance to False
+        simple_class = all([b._meta.get('abstract')
+                            for b in flattened_bases if hasattr(b, '_meta')])
+        if (not simple_class and meta['allow_inheritance'] is False and
+           not meta['abstract']):
+            raise ValueError('Only direct subclasses of Document may set '
+                             '"allow_inheritance" to False')
+
+        # Set default collection name
+        if 'collection' not in meta:
+            meta['collection'] = ''.join('_%s' % c if c.isupper() else c
+                                         for c in name).strip('_').lower()
+        attrs['_meta'] = meta
+
+        # Call super and get the new class
+        new_class = super_new(cls, name, bases, attrs)
+
+        meta = new_class._meta
+
+        # Set index specifications
+        meta['index_specs'] = new_class._build_index_specs(meta['indexes'])
+
+        # If collection is a callable - call it and set the value
+        collection = meta.get('collection')
+        if callable(collection):
+            new_class._meta['collection'] = collection(new_class)
+
+        # Provide a default queryset unless exists or one has been set
+        if 'objects' not in dir(new_class):
+            new_class.objects = QuerySetManager()
+
+        # Validate the fields and set primary key if needed
+        for field_name, field in new_class._fields.iteritems():
+            if field.primary_key:
+                # Ensure only one primary key is set
+                current_pk = new_class._meta.get('id_field')
+                if current_pk and current_pk != field_name:
+                    raise ValueError('Cannot override primary key field')
+
+                # Set primary key
+                if not current_pk:
+                    new_class._meta['id_field'] = field_name
+                    new_class.id = field
+
+        # Set primary key if not defined by the document
+        new_class._auto_id_field = False
+        if not new_class._meta.get('id_field'):
+            new_class._auto_id_field = True
+            new_class._meta['id_field'] = 'id'
+            new_class._fields['id'] = ObjectIdField(db_field='_id')
+            new_class._fields['id'].name = 'id'
+            new_class.id = new_class._fields['id']
+
+        # Prepend id field to _fields_ordered
+        if 'id' in new_class._fields and 'id' not in new_class._fields_ordered:
+            new_class._fields_ordered = ('id', ) + new_class._fields_ordered
+
+        # Merge in exceptions with parent hierarchy
+        exceptions_to_merge = (DoesNotExist, MultipleObjectsReturned)
+        module = attrs.get('__module__')
+        for exc in exceptions_to_merge:
+            name = exc.__name__
+            parents = tuple(getattr(base, name) for base in flattened_bases
+                         if hasattr(base, name)) or (exc,)
+            # Create new exception and set to new_class
+            exception = type(name, parents, {'__module__': module})
+            setattr(new_class, name, exception)
+
+        return new_class
+
+
+class MetaDict(dict):
+    """Custom dictionary for meta classes.
+    Handles the merging of set indexes
+    """
+    _merge_options = ('indexes',)
+
+    def merge(self, new_options):
+        for k, v in new_options.iteritems():
+            if k in self._merge_options:
+                self[k] = self.get(k, []) + v
+            else:
+                self[k] = v
+
+
+class BasesTuple(tuple):
+    """Special class to handle introspection of bases tuple in __new__"""
+    pass

mongoengine/common.py

@@ -0,0 +1,50 @@
+_class_registry_cache = {}
+
+
+def _import_class(cls_name):
+    """Cache mechanism for imports.
+
+    Due to complications of circular imports mongoengine needs to do lots of
+    inline imports in functions.  This is inefficient as classes are
+    imported repeated throughout the mongoengine code.  This is
+    compounded by some recursive functions requiring inline imports.
+
+    :mod:`mongoengine.common` provides a single point to import all these
+    classes.  Circular imports aren't an issue as it dynamically imports the
+    class when first needed.  Subsequent calls to the
+    :func:`~mongoengine.common._import_class` can then directly retrieve the
+    class from the :data:`mongoengine.common._class_registry_cache`.
+    """
+    if cls_name in _class_registry_cache:
+        return _class_registry_cache.get(cls_name)
+
+    doc_classes = ('Document', 'DynamicEmbeddedDocument', 'EmbeddedDocument',
+                   'MapReduceDocument')
+    field_classes = ('DictField', 'DynamicField', 'EmbeddedDocumentField',
+                     'FileField', 'GenericReferenceField',
+                     'GenericEmbeddedDocumentField', 'GeoPointField',
+                     'PointField', 'LineStringField', 'ListField',
+                     'PolygonField', 'ReferenceField', 'StringField',
+                     'ComplexBaseField')
+    queryset_classes = ('OperationError',)
+    deref_classes = ('DeReference',)
+
+    if cls_name in doc_classes:
+        from mongoengine import document as module
+        import_classes = doc_classes
+    elif cls_name in field_classes:
+        from mongoengine import fields as module
+        import_classes = field_classes
+    elif cls_name in queryset_classes:
+        from mongoengine import queryset as module
+        import_classes = queryset_classes
+    elif cls_name in deref_classes:
+        from mongoengine import dereference as module
+        import_classes = deref_classes
+    else:
+        raise ValueError('No import set for: ' % cls_name)
+
+    for cls in import_classes:
+        _class_registry_cache[cls] = getattr(module, cls)
+
+    return _class_registry_cache.get(cls_name)

mongoengine/connection.py

@@ -1,62 +1,167 @@
-from pymongo import Connection
+import pymongo
+from pymongo import MongoClient, MongoReplicaSetClient, uri_parser
 
 
-__all__ = ['ConnectionError', 'connect']
+__all__ = ['ConnectionError', 'connect', 'register_connection',
+           'DEFAULT_CONNECTION_NAME']
 
 
-_connection_settings = {
+DEFAULT_CONNECTION_NAME = 'default'
-    'host': 'localhost',
-    'port': 27017,
-    'pool_size': 1,
-}
-_connection = None
-
-_db_name = None
-_db_username = None
-_db_password = None
-_db = None
 
 
 class ConnectionError(Exception):
     pass
 
 
-def _get_connection():
+_connection_settings = {}
-    global _connection
+_connections = {}
-    # Connect to the database if not already connected
+_dbs = {}
-    if _connection is None:
-        try:
-            _connection = Connection(**_connection_settings)
-        except:
-            raise ConnectionError('Cannot connect to the database')
-    return _connection
 
-def _get_db():
-    global _db, _connection
-    # Connect if not already connected
-    if _connection is None:
-        _connection = _get_connection()
 
-    if _db is None:
+def register_connection(alias, name, host='localhost', port=27017,
-        # _db_name will be None if the user hasn't called connect()
+                        is_slave=False, read_preference=False, slaves=None,
-        if _db_name is None:
+                        username=None, password=None, **kwargs):
-            raise ConnectionError('Not connected to the database')
+    """Add a connection.
 
-        # Get DB from current connection and authenticate if necessary
+    :param alias: the name that will be used to refer to this connection
-        _db = _connection[_db_name]
+        throughout MongoEngine
-        if _db_username and _db_password:
+    :param name: the name of the specific database to use
-            _db.authenticate(_db_username, _db_password)
+    :param host: the host name of the :program:`mongod` instance to connect to
+    :param port: the port that the :program:`mongod` instance is running on
+    :param is_slave: whether the connection can act as a slave
+      ** Depreciated pymongo 2.0.1+
+    :param read_preference: The read preference for the collection
+       ** Added pymongo 2.1
+    :param slaves: a list of aliases of slave connections; each of these must
+        be a registered connection that has :attr:`is_slave` set to ``True``
+    :param username: username to authenticate with
+    :param password: password to authenticate with
+    :param kwargs: allow ad-hoc parameters to be passed into the pymongo driver
 
-    return _db
-
-def connect(db, username=None, password=None, **kwargs):
-    """Connect to the database specified by the 'db' argument. Connection 
-    settings may be provided here as well if the database is not running on
-    the default port on localhost. If authentication is needed, provide
-    username and password arguments as well.
     """
-    global _connection_settings, _db_name, _db_username, _db_password
+    global _connection_settings
-    _connection_settings.update(kwargs)
+
-    _db_name = db
+    conn_settings = {
-    _db_username = username
+        'name': name,
-    _db_password = password
+        'host': host,
+        'port': port,
+        'is_slave': is_slave,
+        'slaves': slaves or [],
+        'username': username,
+        'password': password,
+        'read_preference': read_preference
+    }
+
+    # Handle uri style connections
+    if "://" in host:
+        uri_dict = uri_parser.parse_uri(host)
+        conn_settings.update({
+            'host': host,
+            'name': uri_dict.get('database') or name,
+            'username': uri_dict.get('username'),
+            'password': uri_dict.get('password'),
+            'read_preference': read_preference,
+        })
+        if "replicaSet" in host:
+            conn_settings['replicaSet'] = True
+
+    conn_settings.update(kwargs)
+    _connection_settings[alias] = conn_settings
+
+
+def disconnect(alias=DEFAULT_CONNECTION_NAME):
+    global _connections
+    global _dbs
+
+    if alias in _connections:
+        get_connection(alias=alias).disconnect()
+        del _connections[alias]
+    if alias in _dbs:
+        del _dbs[alias]
+
+
+def get_connection(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
+    global _connections
+    # Connect to the database if not already connected
+    if reconnect:
+        disconnect(alias)
+
+    if alias not in _connections:
+        if alias not in _connection_settings:
+            msg = 'Connection with alias "%s" has not been defined' % alias
+            if alias == DEFAULT_CONNECTION_NAME:
+                msg = 'You have not defined a default connection'
+            raise ConnectionError(msg)
+        conn_settings = _connection_settings[alias].copy()
+
+        if hasattr(pymongo, 'version_tuple'):  # Support for 2.1+
+            conn_settings.pop('name', None)
+            conn_settings.pop('slaves', None)
+            conn_settings.pop('is_slave', None)
+            conn_settings.pop('username', None)
+            conn_settings.pop('password', None)
+        else:
+            # Get all the slave connections
+            if 'slaves' in conn_settings:
+                slaves = []
+                for slave_alias in conn_settings['slaves']:
+                    slaves.append(get_connection(slave_alias))
+                conn_settings['slaves'] = slaves
+                conn_settings.pop('read_preference', None)
+
+        connection_class = MongoClient
+        if 'replicaSet' in conn_settings:
+            conn_settings['hosts_or_uri'] = conn_settings.pop('host', None)
+            # Discard port since it can't be used on MongoReplicaSetClient
+            conn_settings.pop('port', None)
+            # Discard replicaSet if not base string
+            if not isinstance(conn_settings['replicaSet'], basestring):
+                conn_settings.pop('replicaSet', None)
+            connection_class = MongoReplicaSetClient
+
+        try:
+            _connections[alias] = connection_class(**conn_settings)
+        except Exception, e:
+            raise ConnectionError("Cannot connect to database %s :\n%s" % (alias, e))
+    return _connections[alias]
+
+
+def get_db(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
+    global _dbs
+    if reconnect:
+        disconnect(alias)
+
+    if alias not in _dbs:
+        conn = get_connection(alias)
+        conn_settings = _connection_settings[alias]
+        db = conn[conn_settings['name']]
+        # Authenticate if necessary
+        if conn_settings['username'] and conn_settings['password']:
+            db.authenticate(conn_settings['username'],
+                            conn_settings['password'])
+        _dbs[alias] = db
+    return _dbs[alias]
+
+
+def connect(db, alias=DEFAULT_CONNECTION_NAME, **kwargs):
+    """Connect to the database specified by the 'db' argument.
+
+    Connection settings may be provided here as well if the database is not
+    running on the default port on localhost. If authentication is needed,
+    provide username and password arguments as well.
+
+    Multiple databases are supported by using aliases.  Provide a separate
+    `alias` to connect to a different instance of :program:`mongod`.
+
+    .. versionchanged:: 0.6 - added multiple database support.
+    """
+    global _connections
+    if alias not in _connections:
+        register_connection(alias, db, **kwargs)
+
+    return get_connection(alias)
+
+
+# Support old naming convention
+_get_connection = get_connection
+_get_db = get_db

mongoengine/context_managers.py

@@ -0,0 +1,228 @@
+from mongoengine.common import _import_class
+from mongoengine.connection import DEFAULT_CONNECTION_NAME, get_db
+from mongoengine.queryset import QuerySet
+
+
+__all__ = ("switch_db", "switch_collection", "no_dereference",
+           "no_sub_classes", "query_counter")
+
+
+class switch_db(object):
+    """ switch_db alias context manager.
+
+    Example ::
+
+        # Register connections
+        register_connection('default', 'mongoenginetest')
+        register_connection('testdb-1', 'mongoenginetest2')
+
+        class Group(Document):
+            name = StringField()
+
+        Group(name="test").save()  # Saves in the default db
+
+        with switch_db(Group, 'testdb-1') as Group:
+            Group(name="hello testdb!").save()  # Saves in testdb-1
+
+    """
+
+    def __init__(self, cls, db_alias):
+        """ Construct the switch_db context manager
+
+        :param cls: the class to change the registered db
+        :param db_alias: the name of the specific database to use
+        """
+        self.cls = cls
+        self.collection = cls._get_collection()
+        self.db_alias = db_alias
+        self.ori_db_alias = cls._meta.get("db_alias", DEFAULT_CONNECTION_NAME)
+
+    def __enter__(self):
+        """ change the db_alias and clear the cached collection """
+        self.cls._meta["db_alias"] = self.db_alias
+        self.cls._collection = None
+        return self.cls
+
+    def __exit__(self, t, value, traceback):
+        """ Reset the db_alias and collection """
+        self.cls._meta["db_alias"] = self.ori_db_alias
+        self.cls._collection = self.collection
+
+
+class switch_collection(object):
+    """ switch_collection alias context manager.
+
+    Example ::
+
+        class Group(Document):
+            name = StringField()
+
+        Group(name="test").save()  # Saves in the default db
+
+        with switch_collection(Group, 'group1') as Group:
+            Group(name="hello testdb!").save()  # Saves in group1 collection
+
+    """
+
+    def __init__(self, cls, collection_name):
+        """ Construct the switch_collection context manager
+
+        :param cls: the class to change the registered db
+        :param collection_name: the name of the collection to use
+        """
+        self.cls = cls
+        self.ori_collection = cls._get_collection()
+        self.ori_get_collection_name = cls._get_collection_name
+        self.collection_name = collection_name
+
+    def __enter__(self):
+        """ change the _get_collection_name and clear the cached collection """
+
+        @classmethod
+        def _get_collection_name(cls):
+            return self.collection_name
+
+        self.cls._get_collection_name = _get_collection_name
+        self.cls._collection = None
+        return self.cls
+
+    def __exit__(self, t, value, traceback):
+        """ Reset the collection """
+        self.cls._collection = self.ori_collection
+        self.cls._get_collection_name = self.ori_get_collection_name
+
+
+class no_dereference(object):
+    """ no_dereference context manager.
+
+    Turns off all dereferencing in Documents for the duration of the context
+    manager::
+
+        with no_dereference(Group) as Group:
+            Group.objects.find()
+
+    """
+
+    def __init__(self, cls):
+        """ Construct the no_dereference context manager.
+
+        :param cls: the class to turn dereferencing off on
+        """
+        self.cls = cls
+
+        ReferenceField = _import_class('ReferenceField')
+        GenericReferenceField = _import_class('GenericReferenceField')
+        ComplexBaseField = _import_class('ComplexBaseField')
+
+        self.deref_fields = [k for k, v in self.cls._fields.iteritems()
+                             if isinstance(v, (ReferenceField,
+                                               GenericReferenceField,
+                                               ComplexBaseField))]
+
+    def __enter__(self):
+        """ change the objects default and _auto_dereference values"""
+        for field in self.deref_fields:
+            self.cls._fields[field]._auto_dereference = False
+        return self.cls
+
+    def __exit__(self, t, value, traceback):
+        """ Reset the default and _auto_dereference values"""
+        for field in self.deref_fields:
+            self.cls._fields[field]._auto_dereference = True
+        return self.cls
+
+
+class no_sub_classes(object):
+    """ no_sub_classes context manager.
+
+    Only returns instances of this class and no sub (inherited) classes::
+
+        with no_sub_classes(Group) as Group:
+            Group.objects.find()
+
+    """
+
+    def __init__(self, cls):
+        """ Construct the no_sub_classes context manager.
+
+        :param cls: the class to turn querying sub classes on
+        """
+        self.cls = cls
+
+    def __enter__(self):
+        """ change the objects default and _auto_dereference values"""
+        self.cls._all_subclasses = self.cls._subclasses
+        self.cls._subclasses = (self.cls,)
+        return self.cls
+
+    def __exit__(self, t, value, traceback):
+        """ Reset the default and _auto_dereference values"""
+        self.cls._subclasses = self.cls._all_subclasses
+        delattr(self.cls, '_all_subclasses')
+        return self.cls
+
+
+class QuerySetNoDeRef(QuerySet):
+    """Special no_dereference QuerySet"""
+    def __dereference(items, max_depth=1, instance=None, name=None):
+            return items
+
+
+class query_counter(object):
+    """ Query_counter context manager to get the number of queries. """
+
+    def __init__(self):
+        """ Construct the query_counter. """
+        self.counter = 0
+        self.db = get_db()
+
+    def __enter__(self):
+        """ On every with block we need to drop the profile collection. """
+        self.db.set_profiling_level(0)
+        self.db.system.profile.drop()
+        self.db.set_profiling_level(2)
+        return self
+
+    def __exit__(self, t, value, traceback):
+        """ Reset the profiling level. """
+        self.db.set_profiling_level(0)
+
+    def __eq__(self, value):
+        """ == Compare querycounter. """
+        counter = self._get_count()
+        return value == counter
+
+    def __ne__(self, value):
+        """ != Compare querycounter. """
+        return not self.__eq__(value)
+
+    def __lt__(self, value):
+        """ < Compare querycounter. """
+        return self._get_count() < value
+
+    def __le__(self, value):
+        """ <= Compare querycounter. """
+        return self._get_count() <= value
+
+    def __gt__(self, value):
+        """ > Compare querycounter. """
+        return self._get_count() > value
+
+    def __ge__(self, value):
+        """ >= Compare querycounter. """
+        return self._get_count() >= value
+
+    def __int__(self):
+        """ int representation. """
+        return self._get_count()
+
+    def __repr__(self):
+        """ repr query_counter as the number of queries. """
+        return u"%s" % self._get_count()
+
+    def _get_count(self):
+        """ Get the number of queries. """
+        ignore_query = {"ns": {"$ne": "%s.system.indexes" % self.db.name}}
+        count = self.db.system.profile.find(ignore_query).count() - self.counter
+        self.counter += 1
+        return count

mongoengine/dereference.py

@@ -0,0 +1,216 @@
+from bson import DBRef, SON
+
+from base import (BaseDict, BaseList, TopLevelDocumentMetaclass, get_document)
+from fields import (ReferenceField, ListField, DictField, MapField)
+from connection import get_db
+from queryset import QuerySet
+from document import Document, EmbeddedDocument
+
+
+class DeReference(object):
+
+    def __call__(self, items, max_depth=1, instance=None, name=None):
+        """
+        Cheaply dereferences the items to a set depth.
+        Also handles the convertion of complex data types.
+
+        :param items: The iterable (dict, list, queryset) to be dereferenced.
+        :param max_depth: The maximum depth to recurse to
+        :param instance: The owning instance used for tracking changes by
+            :class:`~mongoengine.base.ComplexBaseField`
+        :param name: The name of the field, used for tracking changes by
+            :class:`~mongoengine.base.ComplexBaseField`
+        :param get: A boolean determining if being called by __get__
+        """
+        if items is None or isinstance(items, basestring):
+            return items
+
+        # cheapest way to convert a queryset to a list
+        # list(queryset) uses a count() query to determine length
+        if isinstance(items, QuerySet):
+            items = [i for i in items]
+
+        self.max_depth = max_depth
+        doc_type = None
+
+        if instance and isinstance(instance, (Document, EmbeddedDocument,
+                                              TopLevelDocumentMetaclass)):
+            doc_type = instance._fields.get(name)
+            if hasattr(doc_type, 'field'):
+                doc_type = doc_type.field
+
+            if isinstance(doc_type, ReferenceField):
+                field = doc_type
+                doc_type = doc_type.document_type
+                is_list = not hasattr(items, 'items')
+
+                if is_list and all([i.__class__ == doc_type for i in items]):
+                    return items
+                elif not is_list and all([i.__class__ == doc_type
+                                         for i in items.values()]):
+                    return items
+                elif not field.dbref:
+                    if not hasattr(items, 'items'):
+                        items = [field.to_python(v)
+                             if not isinstance(v, (DBRef, Document)) else v
+                             for v in items]
+                    else:
+                        items = dict([
+                            (k, field.to_python(v))
+                            if not isinstance(v, (DBRef, Document)) else (k, v)
+                            for k, v in items.iteritems()]
+                        )
+
+        self.reference_map = self._find_references(items)
+        self.object_map = self._fetch_objects(doc_type=doc_type)
+        return self._attach_objects(items, 0, instance, name)
+
+    def _find_references(self, items, depth=0):
+        """
+        Recursively finds all db references to be dereferenced
+
+        :param items: The iterable (dict, list, queryset)
+        :param depth: The current depth of recursion
+        """
+        reference_map = {}
+        if not items or depth >= self.max_depth:
+            return reference_map
+
+        # Determine the iterator to use
+        if not hasattr(items, 'items'):
+            iterator = enumerate(items)
+        else:
+            iterator = items.iteritems()
+
+        # Recursively find dbreferences
+        depth += 1
+        for k, item in iterator:
+            if isinstance(item, Document):
+                for field_name, field in item._fields.iteritems():
+                    v = item._data.get(field_name, None)
+                    if isinstance(v, (DBRef)):
+                        reference_map.setdefault(field.document_type, []).append(v.id)
+                    elif isinstance(v, (dict, SON)) and '_ref' in v:
+                        reference_map.setdefault(get_document(v['_cls']), []).append(v['_ref'].id)
+                    elif isinstance(v, (dict, list, tuple)) and depth <= self.max_depth:
+                        field_cls = getattr(getattr(field, 'field', None), 'document_type', None)
+                        references = self._find_references(v, depth)
+                        for key, refs in references.iteritems():
+                            if isinstance(field_cls, (Document, TopLevelDocumentMetaclass)):
+                                key = field_cls
+                            reference_map.setdefault(key, []).extend(refs)
+            elif isinstance(item, (DBRef)):
+                reference_map.setdefault(item.collection, []).append(item.id)
+            elif isinstance(item, (dict, SON)) and '_ref' in item:
+                reference_map.setdefault(get_document(item['_cls']), []).append(item['_ref'].id)
+            elif isinstance(item, (dict, list, tuple)) and depth - 1 <= self.max_depth:
+                references = self._find_references(item, depth - 1)
+                for key, refs in references.iteritems():
+                    reference_map.setdefault(key, []).extend(refs)
+
+        return reference_map
+
+    def _fetch_objects(self, doc_type=None):
+        """Fetch all references and convert to their document objects
+        """
+        object_map = {}
+        for col, dbrefs in self.reference_map.iteritems():
+            keys = object_map.keys()
+            refs = list(set([dbref for dbref in dbrefs if unicode(dbref).encode('utf-8') not in keys]))
+            if hasattr(col, 'objects'):  # We have a document class for the refs
+                references = col.objects.in_bulk(refs)
+                for key, doc in references.iteritems():
+                    object_map[key] = doc
+            else:  # Generic reference: use the refs data to convert to document
+                if isinstance(doc_type, (ListField, DictField, MapField,)):
+                    continue
+
+                if doc_type:
+                    references = doc_type._get_db()[col].find({'_id': {'$in': refs}})
+                    for ref in references:
+                        doc = doc_type._from_son(ref)
+                        object_map[doc.id] = doc
+                else:
+                    references = get_db()[col].find({'_id': {'$in': refs}})
+                    for ref in references:
+                        if '_cls' in ref:
+                            doc = get_document(ref["_cls"])._from_son(ref)
+                        elif doc_type is None:
+                            doc = get_document(
+                                ''.join(x.capitalize()
+                                    for x in col.split('_')))._from_son(ref)
+                        else:
+                            doc = doc_type._from_son(ref)
+                        object_map[doc.id] = doc
+        return object_map
+
+    def _attach_objects(self, items, depth=0, instance=None, name=None):
+        """
+        Recursively finds all db references to be dereferenced
+
+        :param items: The iterable (dict, list, queryset)
+        :param depth: The current depth of recursion
+        :param instance: The owning instance used for tracking changes by
+            :class:`~mongoengine.base.ComplexBaseField`
+        :param name: The name of the field, used for tracking changes by
+            :class:`~mongoengine.base.ComplexBaseField`
+        """
+        if not items:
+            if isinstance(items, (BaseDict, BaseList)):
+                return items
+
+            if instance:
+                if isinstance(items, dict):
+                    return BaseDict(items, instance, name)
+                else:
+                    return BaseList(items, instance, name)
+
+        if isinstance(items, (dict, SON)):
+            if '_ref' in items:
+                return self.object_map.get(items['_ref'].id, items)
+            elif '_cls' in items:
+                doc = get_document(items['_cls'])._from_son(items)
+                doc._data = self._attach_objects(doc._data, depth, doc, None)
+                return doc
+
+        if not hasattr(items, 'items'):
+            is_list = True
+            as_tuple = isinstance(items, tuple)
+            iterator = enumerate(items)
+            data = []
+        else:
+            is_list = False
+            iterator = items.iteritems()
+            data = {}
+
+        depth += 1
+        for k, v in iterator:
+            if is_list:
+                data.append(v)
+            else:
+                data[k] = v
+
+            if k in self.object_map and not is_list:
+                data[k] = self.object_map[k]
+            elif isinstance(v, Document):
+                for field_name, field in v._fields.iteritems():
+                    v = data[k]._data.get(field_name, None)
+                    if isinstance(v, (DBRef)):
+                        data[k]._data[field_name] = self.object_map.get(v.id, v)
+                    elif isinstance(v, (dict, SON)) and '_ref' in v:
+                        data[k]._data[field_name] = self.object_map.get(v['_ref'].id, v)
+                    elif isinstance(v, dict) and depth <= self.max_depth:
+                        data[k]._data[field_name] = self._attach_objects(v, depth, instance=instance, name=name)
+                    elif isinstance(v, (list, tuple)) and depth <= self.max_depth:
+                        data[k]._data[field_name] = self._attach_objects(v, depth, instance=instance, name=name)
+            elif isinstance(v, (dict, list, tuple)) and depth <= self.max_depth:
+                data[k] = self._attach_objects(v, depth - 1, instance=instance, name=name)
+            elif hasattr(v, 'id'):
+                data[k] = self.object_map.get(v.id, v)
+
+        if instance and name:
+            if is_list:
+                return tuple(data) if as_tuple else BaseList(data, instance, name)
+            return BaseDict(data, instance, name)
+        depth += 1
+        return data

mongoengine/django/auth.py

@@ -1,35 +1,247 @@
 from mongoengine import *
 
-from django.utils.hashcompat import md5_constructor, sha_constructor
 from django.utils.encoding import smart_str
+from django.contrib.auth.models import _user_has_perm, _user_get_all_permissions, _user_has_module_perms
+from django.db import models
+from django.contrib.contenttypes.models import ContentTypeManager
+from django.contrib import auth
 from django.contrib.auth.models import AnonymousUser
+from django.utils.translation import ugettext_lazy as _
 
-import datetime
+try:
+    from django.contrib.auth.hashers import check_password, make_password
+except ImportError:
+    """Handle older versions of Django"""
+    from django.utils.hashcompat import md5_constructor, sha_constructor
+
+    def get_hexdigest(algorithm, salt, raw_password):
+        raw_password, salt = smart_str(raw_password), smart_str(salt)
+        if algorithm == 'md5':
+            return md5_constructor(salt + raw_password).hexdigest()
+        elif algorithm == 'sha1':
+            return sha_constructor(salt + raw_password).hexdigest()
+        raise ValueError('Got unknown password algorithm type in password')
+
+    def check_password(raw_password, password):
+        algo, salt, hash = password.split('$')
+        return hash == get_hexdigest(algo, salt, raw_password)
+
+    def make_password(raw_password):
+        from random import random
+        algo = 'sha1'
+        salt = get_hexdigest(algo, str(random()), str(random()))[:5]
+        hash = get_hexdigest(algo, salt, raw_password)
+        return '%s$%s$%s' % (algo, salt, hash)
+
+from .utils import datetime_now
 
 REDIRECT_FIELD_NAME = 'next'
 
-def get_hexdigest(algorithm, salt, raw_password):
+
-    raw_password, salt = smart_str(raw_password), smart_str(salt)
+class ContentType(Document):
-    if algorithm == 'md5':
+    name = StringField(max_length=100)
-        return md5_constructor(salt + raw_password).hexdigest()
+    app_label = StringField(max_length=100)
-    elif algorithm == 'sha1':
+    model = StringField(max_length=100, verbose_name=_('python model class name'),
-        return sha_constructor(salt + raw_password).hexdigest()
+                        unique_with='app_label')
-    raise ValueError('Got unknown password algorithm type in password')
+    objects = ContentTypeManager()
+
+    class Meta:
+        verbose_name = _('content type')
+        verbose_name_plural = _('content types')
+        # db_table = 'django_content_type'
+        # ordering = ('name',)
+        # unique_together = (('app_label', 'model'),)
+
+    def __unicode__(self):
+        return self.name
+
+    def model_class(self):
+        "Returns the Python model class for this type of content."
+        from django.db import models
+        return models.get_model(self.app_label, self.model)
+
+    def get_object_for_this_type(self, **kwargs):
+        """
+        Returns an object of this type for the keyword arguments given.
+        Basically, this is a proxy around this object_type's get_object() model
+        method. The ObjectNotExist exception, if thrown, will not be caught,
+        so code that calls this method should catch it.
+        """
+        return self.model_class()._default_manager.using(self._state.db).get(**kwargs)
+
+    def natural_key(self):
+        return (self.app_label, self.model)
+
+
+class SiteProfileNotAvailable(Exception):
+    pass
+
+
+class PermissionManager(models.Manager):
+    def get_by_natural_key(self, codename, app_label, model):
+        return self.get(
+            codename=codename,
+            content_type=ContentType.objects.get_by_natural_key(app_label, model)
+        )
+
+
+class Permission(Document):
+    """The permissions system provides a way to assign permissions to specific
+    users and groups of users.
+
+    The permission system is used by the Django admin site, but may also be
+    useful in your own code. The Django admin site uses permissions as follows:
+
+        - The "add" permission limits the user's ability to view the "add"
+          form and add an object.
+        - The "change" permission limits a user's ability to view the change
+          list, view the "change" form and change an object.
+        - The "delete" permission limits the ability to delete an object.
+
+    Permissions are set globally per type of object, not per specific object
+    instance. It is possible to say "Mary may change news stories," but it's
+    not currently possible to say "Mary may change news stories, but only the
+    ones she created herself" or "Mary may only change news stories that have
+    a certain status or publication date."
+
+    Three basic permissions -- add, change and delete -- are automatically
+    created for each Django model.
+    """
+    name = StringField(max_length=50, verbose_name=_('username'))
+    content_type = ReferenceField(ContentType)
+    codename = StringField(max_length=100, verbose_name=_('codename'))
+        # FIXME: don't access field of the other class
+        # unique_with=['content_type__app_label', 'content_type__model'])
+
+    objects = PermissionManager()
+
+    class Meta:
+        verbose_name = _('permission')
+        verbose_name_plural = _('permissions')
+        # unique_together = (('content_type', 'codename'),)
+        # ordering = ('content_type__app_label', 'content_type__model', 'codename')
+
+    def __unicode__(self):
+        return u"%s | %s | %s" % (
+            unicode(self.content_type.app_label),
+            unicode(self.content_type),
+            unicode(self.name))
+
+    def natural_key(self):
+        return (self.codename,) + self.content_type.natural_key()
+    natural_key.dependencies = ['contenttypes.contenttype']
+
+
+class Group(Document):
+    """Groups are a generic way of categorizing users to apply permissions,
+    or some other label, to those users. A user can belong to any number of
+    groups.
+
+    A user in a group automatically has all the permissions granted to that
+    group. For example, if the group Site editors has the permission
+    can_edit_home_page, any user in that group will have that permission.
+
+    Beyond permissions, groups are a convenient way to categorize users to
+    apply some label, or extended functionality, to them. For example, you
+    could create a group 'Special users', and you could write code that would
+    do special things to those users -- such as giving them access to a
+    members-only portion of your site, or sending them members-only
+    e-mail messages.
+    """
+    name = StringField(max_length=80, unique=True, verbose_name=_('name'))
+    permissions = ListField(ReferenceField(Permission, verbose_name=_('permissions'), required=False))
+
+    class Meta:
+        verbose_name = _('group')
+        verbose_name_plural = _('groups')
+
+    def __unicode__(self):
+        return self.name
+
+
+class UserManager(models.Manager):
+    def create_user(self, username, email, password=None):
+        """
+        Creates and saves a User with the given username, e-mail and password.
+        """
+        now = datetime_now()
+
+        # Normalize the address by lowercasing the domain part of the email
+        # address.
+        try:
+            email_name, domain_part = email.strip().split('@', 1)
+        except ValueError:
+            pass
+        else:
+            email = '@'.join([email_name, domain_part.lower()])
+
+        user = self.model(username=username, email=email, is_staff=False,
+                          is_active=True, is_superuser=False, last_login=now,
+                          date_joined=now)
+
+        user.set_password(password)
+        user.save(using=self._db)
+        return user
+
+    def create_superuser(self, username, email, password):
+        u = self.create_user(username, email, password)
+        u.is_staff = True
+        u.is_active = True
+        u.is_superuser = True
+        u.save(using=self._db)
+        return u
+
+    def make_random_password(self, length=10, allowed_chars='abcdefghjkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ23456789'):
+        "Generates a random password with the given length and given allowed_chars"
+        # Note that default value of allowed_chars does not have "I" or letters
+        # that look like it -- just to avoid confusion.
+        from random import choice
+        return ''.join([choice(allowed_chars) for i in range(length)])
 
 
 class User(Document):
     """A User document that aims to mirror most of the API specified by Django
     at http://docs.djangoproject.com/en/dev/topics/auth/#users
     """
-    username = StringField(max_length=30, required=True)
+    username = StringField(max_length=30, required=True,
-    first_name = StringField(max_length=30)
+                           verbose_name=_('username'),
-    last_name = StringField(max_length=30)
+                           help_text=_("Required. 30 characters or fewer. Letters, numbers and @/./+/-/_ characters"))
-    email = StringField()
+
-    password = StringField(max_length=128)
+    first_name = StringField(max_length=30,
-    is_staff = BooleanField(default=False)
+                             verbose_name=_('first name'))
-    is_active = BooleanField(default=True)
+
-    is_superuser = BooleanField(default=False)
+    last_name = StringField(max_length=30,
-    last_login = DateTimeField(default=datetime.datetime.now)
+                            verbose_name=_('last name'))
+    email = EmailField(verbose_name=_('e-mail address'))
+    password = StringField(max_length=128,
+                           verbose_name=_('password'),
+                           help_text=_("Use '[algo]$[iterations]$[salt]$[hexdigest]' or use the <a href=\"password/\">change password form</a>."))
+    is_staff = BooleanField(default=False,
+                            verbose_name=_('staff status'),
+                            help_text=_("Designates whether the user can log into this admin site."))
+    is_active = BooleanField(default=True,
+                             verbose_name=_('active'),
+                             help_text=_("Designates whether this user should be treated as active. Unselect this instead of deleting accounts."))
+    is_superuser = BooleanField(default=False,
+                                verbose_name=_('superuser status'),
+                                help_text=_("Designates that this user has all permissions without explicitly assigning them."))
+    last_login = DateTimeField(default=datetime_now,
+                               verbose_name=_('last login'))
+    date_joined = DateTimeField(default=datetime_now,
+                                verbose_name=_('date joined'))
+
+    USERNAME_FIELD = 'username'
+    REQUIRED_FIELDS = ['email']
+
+    meta = {
+        'allow_inheritance': True,
+        'indexes': [
+            {'fields': ['username'], 'unique': True, 'sparse': True}
+        ]
+    }
+
+    def __unicode__(self):
+        return self.username
 
     def get_full_name(self):
         """Returns the users first and last names, separated by a space.
@@ -48,11 +260,9 @@ class User(Document):
         assigning to :attr:`~mongoengine.django.auth.User.password` as the
         password is hashed before storage.
         """
-        from random import random
+        self.password = make_password(raw_password)
-        algo = 'sha1'
+        self.save()
-        salt = get_hexdigest(algo, str(random()), str(random()))[:5]
+        return self
-        hash = get_hexdigest(algo, salt, raw_password)
-        self.password = '%s$%s$%s' % (algo, salt, hash)
 
     def check_password(self, raw_password):
         """Checks the user's password against a provided password - always use
@@ -60,28 +270,121 @@ class User(Document):
         :attr:`~mongoengine.django.auth.User.password` as the password is
         hashed before storage.
         """
-        algo, salt, hash = self.password.split('$')
+        return check_password(raw_password, self.password)
-        return hash == get_hexdigest(algo, salt, raw_password)
 
     @classmethod
     def create_user(cls, username, password, email=None):
         """Create (and save) a new user with the given username, password and
         email address.
         """
-        user = User(username=username, email=email)
+        now = datetime_now()
+
+        # Normalize the address by lowercasing the domain part of the email
+        # address.
+        if email is not None:
+            try:
+                email_name, domain_part = email.strip().split('@', 1)
+            except ValueError:
+                pass
+            else:
+                email = '@'.join([email_name, domain_part.lower()])
+
+        user = cls(username=username, email=email, date_joined=now)
         user.set_password(password)
         user.save()
         return user
 
+    def get_group_permissions(self, obj=None):
+        """
+        Returns a list of permission strings that this user has through his/her
+        groups. This method queries all available auth backends. If an object
+        is passed in, only permissions matching this object are returned.
+        """
+        permissions = set()
+        for backend in auth.get_backends():
+            if hasattr(backend, "get_group_permissions"):
+                permissions.update(backend.get_group_permissions(self, obj))
+        return permissions
+
+    def get_all_permissions(self, obj=None):
+        return _user_get_all_permissions(self, obj)
+
+    def has_perm(self, perm, obj=None):
+        """
+        Returns True if the user has the specified permission. This method
+        queries all available auth backends, but returns immediately if any
+        backend returns True. Thus, a user who has permission from a single
+        auth backend is assumed to have permission in general. If an object is
+        provided, permissions for this specific object are checked.
+        """
+
+        # Active superusers have all permissions.
+        if self.is_active and self.is_superuser:
+            return True
+
+        # Otherwise we need to check the backends.
+        return _user_has_perm(self, perm, obj)
+
+    def has_module_perms(self, app_label):
+        """
+        Returns True if the user has any permissions in the given app label.
+        Uses pretty much the same logic as has_perm, above.
+        """
+        # Active superusers have all permissions.
+        if self.is_active and self.is_superuser:
+            return True
+
+        return _user_has_module_perms(self, app_label)
+
+    def email_user(self, subject, message, from_email=None):
+        "Sends an e-mail to this User."
+        from django.core.mail import send_mail
+        send_mail(subject, message, from_email, [self.email])
+
+    def get_profile(self):
+        """
+        Returns site-specific profile for this user. Raises
+        SiteProfileNotAvailable if this site does not allow profiles.
+        """
+        if not hasattr(self, '_profile_cache'):
+            from django.conf import settings
+            if not getattr(settings, 'AUTH_PROFILE_MODULE', False):
+                raise SiteProfileNotAvailable('You need to set AUTH_PROFILE_MO'
+                                              'DULE in your project settings')
+            try:
+                app_label, model_name = settings.AUTH_PROFILE_MODULE.split('.')
+            except ValueError:
+                raise SiteProfileNotAvailable('app_label and model_name should'
+                        ' be separated by a dot in the AUTH_PROFILE_MODULE set'
+                        'ting')
+
+            try:
+                model = models.get_model(app_label, model_name)
+                if model is None:
+                    raise SiteProfileNotAvailable('Unable to load the profile '
+                        'model, check AUTH_PROFILE_MODULE in your project sett'
+                        'ings')
+                self._profile_cache = model._default_manager.using(self._state.db).get(user__id__exact=self.id)
+                self._profile_cache.user = self
+            except (ImportError, ImproperlyConfigured):
+                raise SiteProfileNotAvailable
+        return self._profile_cache
+
 
 class MongoEngineBackend(object):
     """Authenticate using MongoEngine and mongoengine.django.auth.User.
     """
 
+    supports_object_permissions = False
+    supports_anonymous_user = False
+    supports_inactive_user = False
+
     def authenticate(self, username=None, password=None):
         user = User.objects(username=username).first()
         if user:
             if password and user.check_password(password):
+                backend = auth.get_backends()[0]
+                user.backend = "%s.%s" % (backend.__module__, backend.__class__.__name__)
                 return user
         return None
 

mongoengine/django/mongo_auth/models.py

@@ -0,0 +1,107 @@
+from django.conf import settings
+from django.contrib.auth.models import UserManager
+from django.core.exceptions import ImproperlyConfigured
+from django.db import models
+from django.utils.importlib import import_module
+from django.utils.translation import ugettext_lazy as _
+
+
+__all__ = (
+    'get_user_document',
+)
+
+
+MONGOENGINE_USER_DOCUMENT = getattr(
+    settings, 'MONGOENGINE_USER_DOCUMENT', 'mongoengine.django.auth.User')
+
+
+def get_user_document():
+    """Get the user document class used for authentication.
+
+    This is the class defined in settings.MONGOENGINE_USER_DOCUMENT, which
+    defaults to `mongoengine.django.auth.User`.
+
+    """
+
+    name = MONGOENGINE_USER_DOCUMENT
+    dot = name.rindex('.')
+    module = import_module(name[:dot])
+    return getattr(module, name[dot + 1:])
+
+
+class MongoUserManager(UserManager):
+    """A User manager wich allows the use of MongoEngine documents in Django.
+
+    To use the manager, you must tell django.contrib.auth to use MongoUser as
+    the user model. In you settings.py, you need:
+
+        INSTALLED_APPS = (
+            ...
+            'django.contrib.auth',
+            'mongoengine.django.mongo_auth',
+            ...
+        )
+        AUTH_USER_MODEL = 'mongo_auth.MongoUser'
+
+    Django will use the model object to access the custom Manager, which will
+    replace the original queryset with MongoEngine querysets.
+
+    By default, mongoengine.django.auth.User will be used to store users. You
+    can specify another document class in MONGOENGINE_USER_DOCUMENT in your
+    settings.py.
+
+    The User Document class has the same requirements as a standard custom user
+    model: https://docs.djangoproject.com/en/dev/topics/auth/customizing/
+
+    In particular, the User Document class must define USERNAME_FIELD and
+    REQUIRED_FIELDS.
+
+    `AUTH_USER_MODEL` has been added in Django 1.5.
+
+    """
+
+    def contribute_to_class(self, model, name):
+        super(MongoUserManager, self).contribute_to_class(model, name)
+        self.dj_model = self.model
+        self.model = get_user_document()
+
+        self.dj_model.USERNAME_FIELD = self.model.USERNAME_FIELD
+        username = models.CharField(_('username'), max_length=30, unique=True)
+        username.contribute_to_class(self.dj_model, self.dj_model.USERNAME_FIELD)
+
+        self.dj_model.REQUIRED_FIELDS = self.model.REQUIRED_FIELDS
+        for name in self.dj_model.REQUIRED_FIELDS:
+            field = models.CharField(_(name), max_length=30)
+            field.contribute_to_class(self.dj_model, name)
+
+
+    def get(self, *args, **kwargs):
+        try:
+            return self.get_query_set().get(*args, **kwargs)
+        except self.model.DoesNotExist:
+            # ModelBackend expects this exception
+            raise self.dj_model.DoesNotExist
+
+    @property
+    def db(self):
+        raise NotImplementedError
+
+    def get_empty_query_set(self):
+        return self.model.objects.none()
+
+    def get_query_set(self):
+        return self.model.objects
+
+
+class MongoUser(models.Model):
+    """"Dummy user model for Django.
+
+    MongoUser is used to replace Django's UserManager with MongoUserManager.
+    The actual user document class is mongoengine.django.auth.User or any
+    other document class specified in MONGOENGINE_USER_DOCUMENT.
+
+    To get the user document class, use `get_user_document()`.
+
+    """
+
+    objects = MongoUserManager()

mongoengine/django/sessions.py

@@ -1,20 +1,54 @@
+from django.conf import settings
 from django.contrib.sessions.backends.base import SessionBase, CreateError
 from django.core.exceptions import SuspiciousOperation
-from django.utils.encoding import force_unicode
+try:
+    from django.utils.encoding import force_unicode
+except ImportError:
+    from django.utils.encoding import force_text as force_unicode
 
 from mongoengine.document import Document
 from mongoengine import fields
 from mongoengine.queryset import OperationError
+from mongoengine.connection import DEFAULT_CONNECTION_NAME
 
-from datetime import datetime
+from .utils import datetime_now
+
+
+MONGOENGINE_SESSION_DB_ALIAS = getattr(
+    settings, 'MONGOENGINE_SESSION_DB_ALIAS',
+    DEFAULT_CONNECTION_NAME)
+
+# a setting for the name of the collection used to store sessions
+MONGOENGINE_SESSION_COLLECTION = getattr(
+    settings, 'MONGOENGINE_SESSION_COLLECTION',
+    'django_session')
+
+# a setting for whether session data is stored encoded or not
+MONGOENGINE_SESSION_DATA_ENCODE = getattr(
+    settings, 'MONGOENGINE_SESSION_DATA_ENCODE',
+    True)
 
 
 class MongoSession(Document):
     session_key = fields.StringField(primary_key=True, max_length=40)
-    session_data = fields.StringField()
+    session_data = fields.StringField() if MONGOENGINE_SESSION_DATA_ENCODE \
+                                        else fields.DictField()
     expire_date = fields.DateTimeField()
 
-    meta = {'collection': 'django_session', 'allow_inheritance': False}
+    meta = {
+        'collection': MONGOENGINE_SESSION_COLLECTION,
+        'db_alias': MONGOENGINE_SESSION_DB_ALIAS,
+        'allow_inheritance': False,
+        'indexes': [
+            {
+                'fields': ['expire_date'],
+                'expireAfterSeconds': 0
+            }
+        ]
+    }
+
+    def get_decoded(self):
+        return SessionStore().decode(self.session_data)
 
 
 class SessionStore(SessionBase):
@@ -24,8 +58,11 @@ class SessionStore(SessionBase):
     def load(self):
         try:
             s = MongoSession.objects(session_key=self.session_key,
-                                     expire_date__gt=datetime.now())[0]
+                                     expire_date__gt=datetime_now)[0]
-            return self.decode(force_unicode(s.session_data))
+            if MONGOENGINE_SESSION_DATA_ENCODE:
+                return self.decode(force_unicode(s.session_data))
+            else:
+                return s.session_data
         except (IndexError, SuspiciousOperation):
             self.create()
             return {}
@@ -35,7 +72,7 @@ class SessionStore(SessionBase):
 
     def create(self):
         while True:
-            self.session_key = self._get_new_session_key()
+            self._session_key = self._get_new_session_key()
             try:
                 self.save(must_create=True)
             except CreateError:
@@ -45,11 +82,16 @@ class SessionStore(SessionBase):
             return
 
     def save(self, must_create=False):
+        if self.session_key is None:
+            self._session_key = self._get_new_session_key()
         s = MongoSession(session_key=self.session_key)
-        s.session_data = self.encode(self._get_session(no_load=must_create))
+        if MONGOENGINE_SESSION_DATA_ENCODE:
+            s.session_data = self.encode(self._get_session(no_load=must_create))
+        else:
+            s.session_data = self._get_session(no_load=must_create)
         s.expire_date = self.get_expiry_date()
         try:
-            s.save(force_insert=must_create, safe=True)
+            s.save(force_insert=must_create)
         except OperationError:
             if must_create:
                 raise CreateError

mongoengine/django/shortcuts.py

@@ -0,0 +1,47 @@
+from mongoengine.queryset import QuerySet
+from mongoengine.base import BaseDocument
+from mongoengine.errors import ValidationError
+
+def _get_queryset(cls):
+    """Inspired by django.shortcuts.*"""
+    if isinstance(cls, QuerySet):
+        return cls
+    else:
+        return cls.objects
+
+def get_document_or_404(cls, *args, **kwargs):
+    """
+    Uses get() to return an document, or raises a Http404 exception if the document
+    does not exist.
+
+    cls may be a Document or QuerySet object. All other passed
+    arguments and keyword arguments are used in the get() query.
+
+    Note: Like with get(), an MultipleObjectsReturned will be raised if more than one
+    object is found.
+
+    Inspired by django.shortcuts.*
+    """
+    queryset = _get_queryset(cls)
+    try:
+        return queryset.get(*args, **kwargs)
+    except (queryset._document.DoesNotExist, ValidationError):
+        from django.http import Http404
+        raise Http404('No %s matches the given query.' % queryset._document._class_name)
+
+def get_list_or_404(cls, *args, **kwargs):
+    """
+    Uses filter() to return a list of documents, or raise a Http404 exception if
+    the list is empty.
+
+    cls may be a Document or QuerySet object. All other passed
+    arguments and keyword arguments are used in the filter() query.
+
+    Inspired by django.shortcuts.*
+    """
+    queryset = _get_queryset(cls)
+    obj_list = list(queryset.filter(*args, **kwargs))
+    if not obj_list:
+        from django.http import Http404
+        raise Http404('No %s matches the given query.' % queryset._document._class_name)
+    return obj_list

mongoengine/django/storage.py

@@ -0,0 +1,112 @@
+import os
+import itertools
+import urlparse
+
+from mongoengine import *
+from django.conf import settings
+from django.core.files.storage import Storage
+from django.core.exceptions import ImproperlyConfigured
+
+
+class FileDocument(Document):
+    """A document used to store a single file in GridFS.
+    """
+    file = FileField()
+
+
+class GridFSStorage(Storage):
+    """A custom storage backend to store files in GridFS
+    """
+
+    def __init__(self, base_url=None):
+
+        if base_url is None:
+            base_url = settings.MEDIA_URL
+        self.base_url = base_url
+        self.document = FileDocument
+        self.field = 'file'
+
+    def delete(self, name):
+        """Deletes the specified file from the storage system.
+        """
+        if self.exists(name):
+            doc = self.document.objects.first()
+            field = getattr(doc, self.field)
+            self._get_doc_with_name(name).delete()  # Delete the FileField
+            field.delete()                          # Delete the FileDocument
+
+    def exists(self, name):
+        """Returns True if a file referened by the given name already exists in the
+        storage system, or False if the name is available for a new file.
+        """
+        doc = self._get_doc_with_name(name)
+        if doc:
+            field = getattr(doc, self.field)
+            return bool(field.name)
+        else:
+            return False
+
+    def listdir(self, path=None):
+        """Lists the contents of the specified path, returning a 2-tuple of lists;
+        the first item being directories, the second item being files.
+        """
+        def name(doc):
+            return getattr(doc, self.field).name
+        docs = self.document.objects
+        return [], [name(d) for d in docs if name(d)]
+
+    def size(self, name):
+        """Returns the total size, in bytes, of the file specified by name.
+        """
+        doc = self._get_doc_with_name(name)
+        if doc:
+            return getattr(doc, self.field).length
+        else:
+            raise ValueError("No such file or directory: '%s'" % name)
+
+    def url(self, name):
+        """Returns an absolute URL where the file's contents can be accessed
+        directly by a web browser.
+        """
+        if self.base_url is None:
+            raise ValueError("This file is not accessible via a URL.")
+        return urlparse.urljoin(self.base_url, name).replace('\\', '/')
+
+    def _get_doc_with_name(self, name):
+        """Find the documents in the store with the given name
+        """
+        docs = self.document.objects
+        doc = [d for d in docs if getattr(d, self.field).name == name]
+        if doc:
+            return doc[0]
+        else:
+            return None
+
+    def _open(self, name, mode='rb'):
+        doc = self._get_doc_with_name(name)
+        if doc:
+            return getattr(doc, self.field)
+        else:
+            raise ValueError("No file found with the name '%s'." % name)
+
+    def get_available_name(self, name):
+        """Returns a filename that's free on the target storage system, and
+        available for new content to be written to.
+        """
+        file_root, file_ext = os.path.splitext(name)
+        # If the filename already exists, add an underscore and a number (before
+        # the file extension, if one exists) to the filename until the generated
+        # filename doesn't exist.
+        count = itertools.count(1)
+        while self.exists(name):
+            # file_ext includes the dot.
+            name = os.path.join("%s_%s%s" % (file_root, count.next(), file_ext))
+
+        return name
+
+    def _save(self, name, content):
+        doc = self.document()
+        getattr(doc, self.field).put(content, filename=name)
+        doc.save()
+
+        return name

mongoengine/django/tests.py

@@ -0,0 +1,39 @@
+#coding: utf-8
+from nose.plugins.skip import SkipTest
+
+from mongoengine.python_support import PY3
+from mongoengine import connect
+
+try:
+    from django.test import TestCase
+    from django.conf import settings
+except Exception as err:
+    if PY3:
+        from unittest import TestCase
+        # Dummy value so no error
+        class settings:
+            MONGO_DATABASE_NAME = 'dummy'
+    else:
+        raise err
+
+
+class MongoTestCase(TestCase):
+
+    def setUp(self):
+        if PY3:
+            raise SkipTest('django does not have Python 3 support')
+
+    """
+    TestCase class that clear the collection between the tests
+    """
+    db_name = 'test_%s' % settings.MONGO_DATABASE_NAME
+    def __init__(self, methodName='runtest'):
+        self.db = connect(self.db_name).get_db()
+        super(MongoTestCase, self).__init__(methodName)
+
+    def _post_teardown(self):
+        super(MongoTestCase, self)._post_teardown()
+        for collection in self.db.collection_names():
+            if collection == 'system.indexes':
+                continue
+            self.db.drop_collection(collection)

mongoengine/django/utils.py

@@ -0,0 +1,6 @@
+try:
+    # django >= 1.4
+    from django.utils.timezone import now as datetime_now
+except ImportError:
+    from datetime import datetime
+    datetime_now = datetime.now

mongoengine/document.py

@@ -1,12 +1,41 @@
-from base import (DocumentMetaclass, TopLevelDocumentMetaclass, BaseDocument,
+import warnings
-                  ValidationError)
-from queryset import OperationError
-from connection import _get_db
 
+import hashlib
 import pymongo
+import re
+
+from pymongo.read_preferences import ReadPreference
+from bson import ObjectId
+from bson.dbref import DBRef
+from mongoengine import signals
+from mongoengine.common import _import_class
+from mongoengine.base import (DocumentMetaclass, TopLevelDocumentMetaclass,
+                              BaseDocument, BaseDict, BaseList,
+                              ALLOW_INHERITANCE, get_document)
+from mongoengine.queryset import OperationError, NotUniqueError, QuerySet
+from mongoengine.connection import get_db, DEFAULT_CONNECTION_NAME
+from mongoengine.context_managers import switch_db, switch_collection
+
+__all__ = ('Document', 'EmbeddedDocument', 'DynamicDocument',
+           'DynamicEmbeddedDocument', 'OperationError',
+           'InvalidCollectionError', 'NotUniqueError', 'MapReduceDocument')
 
 
-__all__ = ['Document', 'EmbeddedDocument', 'ValidationError', 'OperationError']
+def includes_cls(fields):
+    """ Helper function used for ensuring and comparing indexes
+    """
+
+    first_field = None
+    if len(fields):
+        if isinstance(fields[0], basestring):
+            first_field = fields[0]
+        elif isinstance(fields[0], (list, tuple)) and len(fields[0]):
+            first_field = fields[0][0]
+    return first_field == '_cls'
+
+
+class InvalidCollectionError(Exception):
+    pass
 
 
 class EmbeddedDocument(BaseDocument):
@@ -14,10 +43,35 @@ class EmbeddedDocument(BaseDocument):
     collection.  :class:`~mongoengine.EmbeddedDocument`\ s should be used as
     fields on :class:`~mongoengine.Document`\ s through the
     :class:`~mongoengine.EmbeddedDocumentField` field type.
+
+    A :class:`~mongoengine.EmbeddedDocument` subclass may be itself subclassed,
+    to create a specialised version of the embedded document that will be
+    stored in the same collection. To facilitate this behaviour a `_cls`
+    field is added to documents (hidden though the MongoEngine interface).
+    To disable this behaviour and remove the dependence on the presence of
+    `_cls` set :attr:`allow_inheritance` to ``False`` in the :attr:`meta`
+    dictionary.
     """
 
+    # The __metaclass__ attribute is removed by 2to3 when running with Python3
+    # my_metaclass is defined so that metaclass can be queried in Python 2 & 3
+    my_metaclass  = DocumentMetaclass
     __metaclass__ = DocumentMetaclass
 
+    _instance = None
+
+    def __init__(self, *args, **kwargs):
+        super(EmbeddedDocument, self).__init__(*args, **kwargs)
+        self._changed_fields = []
+
+    def __eq__(self, other):
+        if isinstance(other, self.__class__):
+            return self._data == other._data
+        return False
+
+    def __ne__(self, other):
+        return not self.__eq__(other)
+
 
 class Document(BaseDocument):
     """The base class used for defining the structure and properties of
@@ -34,11 +88,11 @@ class Document(BaseDocument):
 
     A :class:`~mongoengine.Document` subclass may be itself subclassed, to
     create a specialised version of the document that will be stored in the
-    same collection. To facilitate this behaviour, `_cls` and `_types`
+    same collection. To facilitate this behaviour a `_cls`
-    fields are added to documents (hidden though the MongoEngine interface
+    field is added to documents (hidden though the MongoEngine interface).
-    though). To disable this behaviour and remove the dependence on the
+    To disable this behaviour and remove the dependence on the presence of
-    presence of `_cls` and `_types`, set :attr:`allow_inheritance` to
+    `_cls` set :attr:`allow_inheritance` to ``False`` in the :attr:`meta`
-    ``False`` in the :attr:`meta` dictionary.
+    dictionary.
 
     A :class:`~mongoengine.Document` may use a **Capped Collection** by
     specifying :attr:`max_documents` and :attr:`max_size` in the :attr:`meta`
@@ -52,65 +106,650 @@ class Document(BaseDocument):
     dictionary. The value should be a list of field names or tuples of field
     names. Index direction may be specified by prefixing the field names with
     a **+** or **-** sign.
+
+    Automatic index creation can be disabled by specifying
+    attr:`auto_create_index` in the :attr:`meta` dictionary. If this is set to
+    False then indexes will not be created by MongoEngine.  This is useful in
+    production systems where index creation is performed as part of a
+    deployment system.
+
+    By default, _cls will be added to the start of every index (that
+    doesn't contain a list) if allow_inheritance is True. This can be
+    disabled by either setting cls to False on the specific index or
+    by setting index_cls to False on the meta dictionary for the document.
     """
 
+    # The __metaclass__ attribute is removed by 2to3 when running with Python3
+    # my_metaclass is defined so that metaclass can be queried in Python 2 & 3
+    my_metaclass  = TopLevelDocumentMetaclass
     __metaclass__ = TopLevelDocumentMetaclass
 
-    def save(self, safe=True, force_insert=False):
+    def pk():
+        """Primary key alias
+        """
+        def fget(self):
+            return getattr(self, self._meta['id_field'])
+
+        def fset(self, value):
+            return setattr(self, self._meta['id_field'], value)
+        return property(fget, fset)
+    pk = pk()
+
+    @classmethod
+    def _get_db(cls):
+        """Some Model using other db_alias"""
+        return get_db(cls._meta.get("db_alias", DEFAULT_CONNECTION_NAME))
+
+    @classmethod
+    def _get_collection(cls):
+        """Returns the collection for the document."""
+        if not hasattr(cls, '_collection') or cls._collection is None:
+            db = cls._get_db()
+            collection_name = cls._get_collection_name()
+            # Create collection as a capped collection if specified
+            if cls._meta['max_size'] or cls._meta['max_documents']:
+                # Get max document limit and max byte size from meta
+                max_size = cls._meta['max_size'] or 10000000  # 10MB default
+                max_documents = cls._meta['max_documents']
+
+                if collection_name in db.collection_names():
+                    cls._collection = db[collection_name]
+                    # The collection already exists, check if its capped
+                    # options match the specified capped options
+                    options = cls._collection.options()
+                    if options.get('max') != max_documents or \
+                       options.get('size') != max_size:
+                        msg = (('Cannot create collection "%s" as a capped '
+                               'collection as it already exists')
+                               % cls._collection)
+                        raise InvalidCollectionError(msg)
+                else:
+                    # Create the collection as a capped collection
+                    opts = {'capped': True, 'size': max_size}
+                    if max_documents:
+                        opts['max'] = max_documents
+                    cls._collection = db.create_collection(
+                        collection_name, **opts
+                    )
+            else:
+                cls._collection = db[collection_name]
+            if cls._meta.get('auto_create_index', True):
+                cls.ensure_indexes()
+        return cls._collection
+
+    def save(self, force_insert=False, validate=True, clean=True,
+             write_concern=None,  cascade=None, cascade_kwargs=None,
+             _refs=None, **kwargs):
         """Save the :class:`~mongoengine.Document` to the database. If the
         document already exists, it will be updated, otherwise it will be
         created.
 
-        If ``safe=True`` and the operation is unsuccessful, an 
-        :class:`~mongoengine.OperationError` will be raised.
-
-        :param safe: check if the operation succeeded before returning
         :param force_insert: only try to create a new document, don't allow
             updates of existing documents
+        :param validate: validates the document; set to ``False`` to skip.
+        :param clean: call the document clean method, requires `validate` to be
+            True.
+        :param write_concern: Extra keyword arguments are passed down to
+            :meth:`~pymongo.collection.Collection.save` OR
+            :meth:`~pymongo.collection.Collection.insert`
+            which will be used as options for the resultant
+            ``getLastError`` command.  For example,
+            ``save(..., write_concern={w: 2, fsync: True}, ...)`` will
+            wait until at least two servers have recorded the write and
+            will force an fsync on the primary server.
+        :param cascade: Sets the flag for cascading saves.  You can set a
+            default by setting "cascade" in the document __meta__
+        :param cascade_kwargs: (optional) kwargs dictionary to be passed throw
+            to cascading saves.  Implies ``cascade=True``.
+        :param _refs: A list of processed references used in cascading saves
+
+        .. versionchanged:: 0.5
+            In existing documents it only saves changed fields using
+            set / unset.  Saves are cascaded and any
+            :class:`~bson.dbref.DBRef` objects that have changes are
+            saved as well.
+        .. versionchanged:: 0.6
+            Added cascading saves
+        .. versionchanged:: 0.8
+            Cascade saves are optional and default to False.  If you want
+            fine grain control then you can turn off using document
+            meta['cascade'] = True.  Also you can pass different kwargs to
+            the cascade save using cascade_kwargs which overwrites the
+            existing kwargs with custom values.
         """
-        self.validate()
+        signals.pre_save.send(self.__class__, document=self)
+
+        if validate:
+            self.validate(clean=clean)
+
+        if write_concern is None:
+            write_concern = {"w": 1}
+
         doc = self.to_mongo()
+
+        created = ('_id' not in doc or self._created or force_insert)
+
+        signals.pre_save_post_validation.send(self.__class__, document=self, created=created)
+
         try:
-            collection = self.__class__.objects._collection
+            collection = self._get_collection()
-            if force_insert:
+            if created:
-                object_id = collection.insert(doc, safe=safe)
+                if force_insert:
+                    object_id = collection.insert(doc, **write_concern)
+                else:
+                    object_id = collection.save(doc, **write_concern)
             else:
-                object_id = collection.save(doc, safe=safe)
+                object_id = doc['_id']
+                updates, removals = self._delta()
+                # Need to add shard key to query, or you get an error
+                select_dict = {'_id': object_id}
+                shard_key = self.__class__._meta.get('shard_key', tuple())
+                for k in shard_key:
+                    actual_key = self._db_field_map.get(k, k)
+                    select_dict[actual_key] = doc[actual_key]
+
+                def is_new_object(last_error):
+                    if last_error is not None:
+                        updated = last_error.get("updatedExisting")
+                        if updated is not None:
+                            return not updated
+                    return created
+
+                update_query = {}
+
+                if updates:
+                    update_query["$set"] = updates
+                if removals:
+                    update_query["$unset"] = removals
+                if updates or removals:
+                    last_error = collection.update(select_dict, update_query,
+                                                   upsert=True, **write_concern)
+                    created = is_new_object(last_error)
+
+            if cascade is None:
+                cascade = self._meta.get('cascade', False) or cascade_kwargs is not None
+
+            if cascade:
+                kwargs = {
+                    "force_insert": force_insert,
+                    "validate": validate,
+                    "write_concern": write_concern,
+                    "cascade": cascade
+                }
+                if cascade_kwargs:  # Allow granular control over cascades
+                    kwargs.update(cascade_kwargs)
+                kwargs['_refs'] = _refs
+                self.cascade_save(**kwargs)
+
         except pymongo.errors.OperationFailure, err:
             message = 'Could not save document (%s)'
-            if 'duplicate key' in str(err):
+            if re.match('^E1100[01] duplicate key', unicode(err)):
-                message = 'Tried to save duplicate unique keys (%s)'
+                # E11000 - duplicate key error index
-            raise OperationError(message % str(err))
+                # E11001 - duplicate key on update
+                message = u'Tried to save duplicate unique keys (%s)'
+                raise NotUniqueError(message % unicode(err))
+            raise OperationError(message % unicode(err))
         id_field = self._meta['id_field']
-        self[id_field] = self._fields[id_field].to_python(object_id)
+        if id_field not in self._meta.get('shard_key', []):
+            self[id_field] = self._fields[id_field].to_python(object_id)
 
-    def delete(self, safe=False):
+        self._clear_changed_fields()
+        self._created = False
+        signals.post_save.send(self.__class__, document=self, created=created)
+        return self
+
+    def cascade_save(self, *args, **kwargs):
+        """Recursively saves any references /
+           generic references on an objects"""
+        _refs = kwargs.get('_refs', []) or []
+
+        ReferenceField = _import_class('ReferenceField')
+        GenericReferenceField = _import_class('GenericReferenceField')
+
+        for name, cls in self._fields.items():
+            if not isinstance(cls, (ReferenceField,
+                                    GenericReferenceField)):
+                continue
+
+            ref = self._data.get(name)
+            if not ref or isinstance(ref, DBRef):
+                continue
+
+            if not getattr(ref, '_changed_fields', True):
+                continue
+
+            ref_id = "%s,%s" % (ref.__class__.__name__, str(ref._data))
+            if ref and ref_id not in _refs:
+                _refs.append(ref_id)
+                kwargs["_refs"] = _refs
+                ref.save(**kwargs)
+                ref._changed_fields = []
+
+    @property
+    def _qs(self):
+        """
+        Returns the queryset to use for updating / reloading / deletions
+        """
+        if not hasattr(self, '__objects'):
+            self.__objects = QuerySet(self, self._get_collection())
+        return self.__objects
+
+    @property
+    def _object_key(self):
+        """Dict to identify object in collection
+        """
+        select_dict = {'pk': self.pk}
+        shard_key = self.__class__._meta.get('shard_key', tuple())
+        for k in shard_key:
+            select_dict[k] = getattr(self, k)
+        return select_dict
+
+    def update(self, **kwargs):
+        """Performs an update on the :class:`~mongoengine.Document`
+        A convenience wrapper to :meth:`~mongoengine.QuerySet.update`.
+
+        Raises :class:`OperationError` if called on an object that has not yet
+        been saved.
+        """
+        if not self.pk:
+            if kwargs.get('upsert', False):
+                query = self.to_mongo()
+                if "_cls" in query:
+                    del(query["_cls"])
+                return self._qs.filter(**query).update_one(**kwargs)
+            else:
+                raise OperationError('attempt to update a document not yet saved')
+
+        # Need to add shard key to query, or you get an error
+        return self._qs.filter(**self._object_key).update_one(**kwargs)
+
+    def delete(self, **write_concern):
         """Delete the :class:`~mongoengine.Document` from the database. This
         will only take effect if the document has been previously saved.
 
-        :param safe: check if the operation succeeded before returning
+        :param write_concern: Extra keyword arguments are passed down which
+            will be used as options for the resultant
+            ``getLastError`` command.  For example,
+            ``save(..., write_concern={w: 2, fsync: True}, ...)`` will
+            wait until at least two servers have recorded the write and
+            will force an fsync on the primary server.
         """
-        id_field = self._meta['id_field']
+        signals.pre_delete.send(self.__class__, document=self)
-        object_id = self._fields[id_field].to_mongo(self[id_field])
-        try:
-            self.__class__.objects(**{id_field: object_id}).delete(safe=safe)
-        except pymongo.errors.OperationFailure, err:
-            raise OperationError('Could not delete document (%s)' % str(err))
 
-    def reload(self):
+        try:
+            self._qs.filter(**self._object_key).delete(write_concern=write_concern, _from_doc_delete=True)
+        except pymongo.errors.OperationFailure, err:
+            message = u'Could not delete document (%s)' % err.message
+            raise OperationError(message)
+        signals.post_delete.send(self.__class__, document=self)
+
+    def switch_db(self, db_alias):
+        """
+        Temporarily switch the database for a document instance.
+
+        Only really useful for archiving off data and calling `save()`::
+
+            user = User.objects.get(id=user_id)
+            user.switch_db('archive-db')
+            user.save()
+
+        If you need to read from another database see
+        :class:`~mongoengine.context_managers.switch_db`
+
+        :param db_alias: The database alias to use for saving the document
+        """
+        with switch_db(self.__class__, db_alias) as cls:
+            collection = cls._get_collection()
+            db = cls._get_db()
+        self._get_collection = lambda: collection
+        self._get_db = lambda: db
+        self._collection = collection
+        self._created = True
+        self.__objects = self._qs
+        self.__objects._collection_obj = collection
+        return self
+
+    def switch_collection(self, collection_name):
+        """
+        Temporarily switch the collection for a document instance.
+
+        Only really useful for archiving off data and calling `save()`::
+
+            user = User.objects.get(id=user_id)
+            user.switch_collection('old-users')
+            user.save()
+
+        If you need to read from another database see
+        :class:`~mongoengine.context_managers.switch_db`
+
+        :param collection_name: The database alias to use for saving the
+            document
+        """
+        with switch_collection(self.__class__, collection_name) as cls:
+            collection = cls._get_collection()
+        self._get_collection = lambda: collection
+        self._collection = collection
+        self._created = True
+        self.__objects = self._qs
+        self.__objects._collection_obj = collection
+        return self
+
+    def select_related(self, max_depth=1):
+        """Handles dereferencing of :class:`~bson.dbref.DBRef` objects to
+        a maximum depth in order to cut down the number queries to mongodb.
+
+        .. versionadded:: 0.5
+        """
+        DeReference = _import_class('DeReference')
+        DeReference()([self], max_depth + 1)
+        return self
+
+    def reload(self, max_depth=1):
         """Reloads all attributes from the database.
 
         .. versionadded:: 0.1.2
+        .. versionchanged:: 0.6  Now chainable
         """
-        id_field = self._meta['id_field']
+        obj = self._qs.read_preference(ReadPreference.PRIMARY).filter(
-        obj = self.__class__.objects(**{id_field: self[id_field]}).first()
+                **self._object_key).limit(1).select_related(max_depth=max_depth)
-        for field in self._fields:
+
-            setattr(self, field, obj[field])
+        if obj:
+            obj = obj[0]
+        else:
+            msg = "Reloaded document has been deleted"
+            raise OperationError(msg)
+        for field in self._fields_ordered:
+            setattr(self, field, self._reload(field, obj[field]))
+        self._changed_fields = obj._changed_fields
+        self._created = False
+        return obj
+
+    def _reload(self, key, value):
+        """Used by :meth:`~mongoengine.Document.reload` to ensure the
+        correct instance is linked to self.
+        """
+        if isinstance(value, BaseDict):
+            value = [(k, self._reload(k, v)) for k, v in value.items()]
+            value = BaseDict(value, self, key)
+        elif isinstance(value, BaseList):
+            value = [self._reload(key, v) for v in value]
+            value = BaseList(value, self, key)
+        elif isinstance(value, (EmbeddedDocument, DynamicEmbeddedDocument)):
+            value._instance = None
+            value._changed_fields = []
+        return value
+
+    def to_dbref(self):
+        """Returns an instance of :class:`~bson.dbref.DBRef` useful in
+        `__raw__` queries."""
+        if not self.pk:
+            msg = "Only saved documents can have a valid dbref"
+            raise OperationError(msg)
+        return DBRef(self.__class__._get_collection_name(), self.pk)
+
+    @classmethod
+    def register_delete_rule(cls, document_cls, field_name, rule):
+        """This method registers the delete rules to apply when removing this
+        object.
+        """
+        classes = [get_document(class_name)
+                    for class_name in cls._subclasses
+                    if class_name != cls.__name__] + [cls]
+        documents = [get_document(class_name)
+                     for class_name in document_cls._subclasses
+                     if class_name != document_cls.__name__] + [document_cls]
+
+        for cls in classes:
+            for document_cls in documents:
+                delete_rules = cls._meta.get('delete_rules') or {}
+                delete_rules[(document_cls, field_name)] = rule
+                cls._meta['delete_rules'] = delete_rules
 
     @classmethod
     def drop_collection(cls):
         """Drops the entire collection associated with this
         :class:`~mongoengine.Document` type from the database.
         """
-        db = _get_db()
+        cls._collection = None
-        db.drop_collection(cls._meta['collection'])
+        db = cls._get_db()
+        db.drop_collection(cls._get_collection_name())
+
+    @classmethod
+    def ensure_index(cls, key_or_list, drop_dups=False, background=False,
+        **kwargs):
+        """Ensure that the given indexes are in place.
+
+        :param key_or_list: a single index key or a list of index keys (to
+            construct a multi-field index); keys may be prefixed with a **+**
+            or a **-** to determine the index ordering
+        """
+        index_spec = cls._build_index_spec(key_or_list)
+        index_spec = index_spec.copy()
+        fields = index_spec.pop('fields')
+        index_spec['drop_dups'] = drop_dups
+        index_spec['background'] = background
+        index_spec.update(kwargs)
+
+        return cls._get_collection().ensure_index(fields, **index_spec)
+
+    @classmethod
+    def ensure_indexes(cls):
+        """Checks the document meta data and ensures all the indexes exist.
+
+        Global defaults can be set in the meta - see :doc:`guide/defining-documents`
+
+        .. note:: You can disable automatic index creation by setting
+                  `auto_create_index` to False in the documents meta data
+        """
+        background = cls._meta.get('index_background', False)
+        drop_dups = cls._meta.get('index_drop_dups', False)
+        index_opts = cls._meta.get('index_opts') or {}
+        index_cls = cls._meta.get('index_cls', True)
+
+        collection = cls._get_collection()
+
+        # determine if an index which we are creating includes
+        # _cls as its first field; if so, we can avoid creating
+        # an extra index on _cls, as mongodb will use the existing
+        # index to service queries against _cls
+        cls_indexed = False
+
+        # Ensure document-defined indexes are created
+        if cls._meta['index_specs']:
+            index_spec = cls._meta['index_specs']
+            for spec in index_spec:
+                spec = spec.copy()
+                fields = spec.pop('fields')
+                cls_indexed = cls_indexed or includes_cls(fields)
+                opts = index_opts.copy()
+                opts.update(spec)
+                collection.ensure_index(fields, background=background,
+                                        drop_dups=drop_dups, **opts)
+
+        # If _cls is being used (for polymorphism), it needs an index,
+        # only if another index doesn't begin with _cls
+        if (index_cls and not cls_indexed and
+           cls._meta.get('allow_inheritance', ALLOW_INHERITANCE) is True):
+            collection.ensure_index('_cls', background=background,
+                                    **index_opts)
+
+    @classmethod
+    def list_indexes(cls, go_up=True, go_down=True):
+        """ Lists all of the indexes that should be created for given
+        collection. It includes all the indexes from super- and sub-classes.
+        """
+
+        if cls._meta.get('abstract'):
+            return []
+
+        # get all the base classes, subclasses and sieblings
+        classes = []
+        def get_classes(cls):
+
+            if (cls not in classes and
+               isinstance(cls, TopLevelDocumentMetaclass)):
+                classes.append(cls)
+
+            for base_cls in cls.__bases__:
+                if (isinstance(base_cls, TopLevelDocumentMetaclass) and
+                   base_cls != Document and
+                   not base_cls._meta.get('abstract') and
+                   base_cls._get_collection().full_name == cls._get_collection().full_name and
+                   base_cls not in classes):
+                    classes.append(base_cls)
+                    get_classes(base_cls)
+            for subclass in cls.__subclasses__():
+                if (isinstance(base_cls, TopLevelDocumentMetaclass) and
+                   subclass._get_collection().full_name == cls._get_collection().full_name and
+                   subclass not in classes):
+                    classes.append(subclass)
+                    get_classes(subclass)
+
+        get_classes(cls)
+
+        # get the indexes spec for all of the gathered classes
+        def get_indexes_spec(cls):
+            indexes = []
+
+            if cls._meta['index_specs']:
+                index_spec = cls._meta['index_specs']
+                for spec in index_spec:
+                    spec = spec.copy()
+                    fields = spec.pop('fields')
+                    indexes.append(fields)
+            return indexes
+
+        indexes = []
+        for cls in classes:
+            for index in get_indexes_spec(cls):
+                if index not in indexes:
+                    indexes.append(index)
+
+        # finish up by appending { '_id': 1 } and { '_cls': 1 }, if needed
+        if [(u'_id', 1)] not in indexes:
+            indexes.append([(u'_id', 1)])
+        if (cls._meta.get('index_cls', True) and
+           cls._meta.get('allow_inheritance', ALLOW_INHERITANCE) is True):
+             indexes.append([(u'_cls', 1)])
+
+        return indexes
+
+    @classmethod
+    def compare_indexes(cls):
+        """ Compares the indexes defined in MongoEngine with the ones existing
+        in the database. Returns any missing/extra indexes.
+        """
+
+        required = cls.list_indexes()
+        existing = [info['key'] for info in cls._get_collection().index_information().values()]
+        missing = [index for index in required if index not in existing]
+        extra = [index for index in existing if index not in required]
+
+        # if { _cls: 1 } is missing, make sure it's *really* necessary
+        if [(u'_cls', 1)] in missing:
+            cls_obsolete = False
+            for index in existing:
+                if includes_cls(index) and index not in extra:
+                    cls_obsolete = True
+                    break
+            if cls_obsolete:
+                missing.remove([(u'_cls', 1)])
+
+        return {'missing': missing, 'extra': extra}
+
+
+class DynamicDocument(Document):
+    """A Dynamic Document class allowing flexible, expandable and uncontrolled
+    schemas.  As a :class:`~mongoengine.Document` subclass, acts in the same
+    way as an ordinary document but has expando style properties.  Any data
+    passed or set against the :class:`~mongoengine.DynamicDocument` that is
+    not a field is automatically converted into a
+    :class:`~mongoengine.fields.DynamicField` and data can be attributed to that
+    field.
+
+    .. note::
+
+        There is one caveat on Dynamic Documents: fields cannot start with `_`
+    """
+
+    # The __metaclass__ attribute is removed by 2to3 when running with Python3
+    # my_metaclass is defined so that metaclass can be queried in Python 2 & 3
+    my_metaclass  = TopLevelDocumentMetaclass
+    __metaclass__ = TopLevelDocumentMetaclass
+
+    _dynamic = True
+
+    def __delattr__(self, *args, **kwargs):
+        """Deletes the attribute by setting to None and allowing _delta to unset
+        it"""
+        field_name = args[0]
+        if field_name in self._dynamic_fields:
+            setattr(self, field_name, None)
+        else:
+            super(DynamicDocument, self).__delattr__(*args, **kwargs)
+
+
+class DynamicEmbeddedDocument(EmbeddedDocument):
+    """A Dynamic Embedded Document class allowing flexible, expandable and
+    uncontrolled schemas. See :class:`~mongoengine.DynamicDocument` for more
+    information about dynamic documents.
+    """
+
+    # The __metaclass__ attribute is removed by 2to3 when running with Python3
+    # my_metaclass is defined so that metaclass can be queried in Python 2 & 3
+    my_metaclass  = DocumentMetaclass
+    __metaclass__ = DocumentMetaclass
+
+    _dynamic = True
+
+    def __delattr__(self, *args, **kwargs):
+        """Deletes the attribute by setting to None and allowing _delta to unset
+        it"""
+        field_name = args[0]
+        if field_name in self._fields:
+            default = self._fields[field_name].default
+            if callable(default):
+                default = default()
+            setattr(self, field_name, default)
+        else:
+            setattr(self, field_name, None)
+
+
+class MapReduceDocument(object):
+    """A document returned from a map/reduce query.
+
+    :param collection: An instance of :class:`~pymongo.Collection`
+    :param key: Document/result key, often an instance of
+                :class:`~bson.objectid.ObjectId`. If supplied as
+                an ``ObjectId`` found in the given ``collection``,
+                the object can be accessed via the ``object`` property.
+    :param value: The result(s) for this key.
+
+    .. versionadded:: 0.3
+    """
+
+    def __init__(self, document, collection, key, value):
+        self._document = document
+        self._collection = collection
+        self.key = key
+        self.value = value
+
+    @property
+    def object(self):
+        """Lazy-load the object referenced by ``self.key``. ``self.key``
+        should be the ``primary_key``.
+        """
+        id_field = self._document()._meta['id_field']
+        id_field_type = type(id_field)
+
+        if not isinstance(self.key, id_field_type):
+            try:
+                self.key = id_field_type(self.key)
+            except:
+                raise Exception("Could not cast key as %s" % \
+                                id_field_type.__name__)
+
+        if not hasattr(self, "_key_object"):
+            self._key_object = self._document.objects.with_id(self.key)
+            return self._key_object
+        return self._key_object

mongoengine/errors.py

@@ -0,0 +1,126 @@
+from collections import defaultdict
+
+from mongoengine.python_support import txt_type
+
+
+__all__ = ('NotRegistered', 'InvalidDocumentError', 'LookUpError',
+           'DoesNotExist', 'MultipleObjectsReturned', 'InvalidQueryError',
+           'OperationError', 'NotUniqueError', 'ValidationError')
+
+
+class NotRegistered(Exception):
+    pass
+
+
+class InvalidDocumentError(Exception):
+    pass
+
+
+class LookUpError(AttributeError):
+    pass
+
+
+class DoesNotExist(Exception):
+    pass
+
+
+class MultipleObjectsReturned(Exception):
+    pass
+
+
+class InvalidQueryError(Exception):
+    pass
+
+
+class OperationError(Exception):
+    pass
+
+
+class NotUniqueError(OperationError):
+    pass
+
+
+class ValidationError(AssertionError):
+    """Validation exception.
+
+    May represent an error validating a field or a
+    document containing fields with validation errors.
+
+    :ivar errors: A dictionary of errors for fields within this
+        document or list, or None if the error is for an
+        individual field.
+    """
+
+    errors = {}
+    field_name = None
+    _message = None
+
+    def __init__(self, message="", **kwargs):
+        self.errors = kwargs.get('errors', {})
+        self.field_name = kwargs.get('field_name')
+        self.message = message
+
+    def __str__(self):
+        return txt_type(self.message)
+
+    def __repr__(self):
+        return '%s(%s,)' % (self.__class__.__name__, self.message)
+
+    def __getattribute__(self, name):
+        message = super(ValidationError, self).__getattribute__(name)
+        if name == 'message':
+            if self.field_name:
+                message = '%s' % message
+            if self.errors:
+                message = '%s(%s)' % (message, self._format_errors())
+        return message
+
+    def _get_message(self):
+        return self._message
+
+    def _set_message(self, message):
+        self._message = message
+
+    message = property(_get_message, _set_message)
+
+    def to_dict(self):
+        """Returns a dictionary of all errors within a document
+
+        Keys are field names or list indices and values are the
+        validation error messages, or a nested dictionary of
+        errors for an embedded document or list.
+        """
+
+        def build_dict(source):
+            errors_dict = {}
+            if not source:
+                return errors_dict
+            if isinstance(source, dict):
+                for field_name, error in source.iteritems():
+                    errors_dict[field_name] = build_dict(error)
+            elif isinstance(source, ValidationError) and source.errors:
+                return build_dict(source.errors)
+            else:
+                return unicode(source)
+            return errors_dict
+        if not self.errors:
+            return {}
+        return build_dict(self.errors)
+
+    def _format_errors(self):
+        """Returns a string listing all errors within a document"""
+
+        def generate_key(value, prefix=''):
+            if isinstance(value, list):
+                value = ' '.join([generate_key(k) for k in value])
+            if isinstance(value, dict):
+                value = ' '.join(
+                        [generate_key(v, k) for k, v in value.iteritems()])
+
+            results = "%s.%s" % (prefix, value) if prefix else value
+            return results
+
+        error_dict = defaultdict(list)
+        for k, v in self.to_dict().iteritems():
+            error_dict[generate_key(v)].append(k)
+        return ' '.join(["%s: %s" % (k, v) for k, v in error_dict.iteritems()])

mongoengine/python_support.py

@@ -0,0 +1,61 @@
+"""Helper functions and types to aid with Python 2.5 - 3 support."""
+
+import sys
+
+PY3 = sys.version_info[0] == 3
+PY25 = sys.version_info[:2] == (2, 5)
+UNICODE_KWARGS = int(''.join([str(x) for x in sys.version_info[:3]])) > 264
+
+if PY3:
+    import codecs
+    from io import BytesIO as StringIO
+    # return s converted to binary.  b('test') should be equivalent to b'test'
+    def b(s):
+        return codecs.latin_1_encode(s)[0]
+
+    bin_type = bytes
+    txt_type   = str
+else:
+    try:
+        from cStringIO import StringIO
+    except ImportError:
+        from StringIO import StringIO
+
+    # Conversion to binary only necessary in Python 3
+    def b(s):
+        return s
+
+    bin_type = str
+    txt_type = unicode
+
+str_types = (bin_type, txt_type)
+
+if PY25:
+    def product(*args, **kwds):
+        pools = map(tuple, args) * kwds.get('repeat', 1)
+        result = [[]]
+        for pool in pools:
+            result = [x + [y] for x in result for y in pool]
+        for prod in result:
+            yield tuple(prod)
+    reduce = reduce
+else:
+    from itertools import product
+    from functools import reduce
+
+
+# For use with Python 2.5
+# converts all keys from unicode to str for d and all nested dictionaries
+def to_str_keys_recursive(d):
+    if isinstance(d, list):
+        for val in d:
+            if isinstance(val, (dict, list)):
+                to_str_keys_recursive(val)
+    elif isinstance(d, dict):
+        for key, val in d.items():
+            if isinstance(val, (dict, list)):
+                to_str_keys_recursive(val)
+            if isinstance(key, unicode):
+                d[str(key)] = d.pop(key)
+    else:
+        raise ValueError("non list/dict parameter not allowed")

mongoengine/queryset.py

@@ -1,665 +0,0 @@
-from connection import _get_db
-
-import pymongo
-import copy
-
-
-__all__ = ['queryset_manager', 'Q', 'InvalidQueryError', 
-           'InvalidCollectionError']
-
-# The maximum number of items to display in a QuerySet.__repr__
-REPR_OUTPUT_SIZE = 20
-
-
-class InvalidQueryError(Exception):
-    pass
-
-
-class OperationError(Exception):
-    pass
-
-
-class Q(object):
-    
-    OR = '||'
-    AND = '&&'
-    OPERATORS = {
-        'eq': 'this.%(field)s == %(value)s',
-        'neq': 'this.%(field)s != %(value)s',
-        'gt': 'this.%(field)s > %(value)s',
-        'gte': 'this.%(field)s >= %(value)s',
-        'lt': 'this.%(field)s < %(value)s',
-        'lte': 'this.%(field)s <= %(value)s',
-        'lte': 'this.%(field)s <= %(value)s',
-        'in': 'this.%(field)s.indexOf(%(value)s) != -1',
-        'nin': 'this.%(field)s.indexOf(%(value)s) == -1',
-        'mod': '%(field)s %% %(value)s',
-        'all': ('%(value)s.every(function(a){'
-                'return this.%(field)s.indexOf(a) != -1 })'),
-        'size': 'this.%(field)s.length == %(value)s',
-        'exists': 'this.%(field)s != null',
-    }
-    
-    def __init__(self, **query):
-        self.query = [query]
-
-    def _combine(self, other, op):
-        obj = Q()
-        obj.query = ['('] + copy.deepcopy(self.query) + [op]
-        obj.query += copy.deepcopy(other.query) + [')']
-        return obj
-
-    def __or__(self, other):
-        return self._combine(other, self.OR)
-
-    def __and__(self, other):
-        return self._combine(other, self.AND)
-
-    def as_js(self, document):
-        js = []
-        js_scope = {}
-        for i, item in enumerate(self.query):
-            if isinstance(item, dict):
-                item_query = QuerySet._transform_query(document, **item)
-                # item_query will values will either be a value or a dict
-                js.append(self._item_query_as_js(item_query, js_scope, i))
-            else:
-                js.append(item)
-        return pymongo.code.Code(' '.join(js), js_scope)
-
-    def _item_query_as_js(self, item_query, js_scope, item_num):
-        # item_query will be in one of the following forms
-        #    {'age': 25, 'name': 'Test'}
-        #    {'age': {'$lt': 25}, 'name': {'$in': ['Test', 'Example']}
-        #    {'age': {'$lt': 25, '$gt': 18}}
-        js = []
-        for i, (key, value) in enumerate(item_query.items()):
-            op = 'eq'
-            # Construct a variable name for the value in the JS
-            value_name = 'i%sf%s' % (item_num, i)
-            if isinstance(value, dict):
-                # Multiple operators for this field
-                for j, (op, value) in enumerate(value.items()):
-                    # Create a custom variable name for this operator
-                    op_value_name = '%so%s' % (value_name, j)
-                    # Update the js scope with the value for this op
-                    js_scope[op_value_name] = value
-                    # Construct the JS that uses this op
-                    operation_js = Q.OPERATORS[op.strip('$')] % {
-                        'field': key, 
-                        'value': op_value_name
-                    }
-                    js.append(operation_js)
-            else:
-                js_scope[value_name] = value
-                # Construct the JS for this field
-                field_js = Q.OPERATORS[op.strip('$')] % {
-                    'field': key, 
-                    'value': value_name
-                }
-                js.append(field_js)
-        return ' && '.join(js)
-
-
-class QuerySet(object):
-    """A set of results returned from a query. Wraps a MongoDB cursor, 
-    providing :class:`~mongoengine.Document` objects as the results.
-    """
-    
-    def __init__(self, document, collection):
-        self._document = document
-        self._collection_obj = collection
-        self._accessed_collection = False
-        self._query = {}
-        self._where_clauses = []
-
-        # If inheritance is allowed, only return instances and instances of
-        # subclasses of the class being used
-        if document._meta.get('allow_inheritance'):
-            self._query = {'_types': self._document._class_name}
-        self._cursor_obj = None
-        
-    def ensure_index(self, key_or_list):
-        """Ensure that the given indexes are in place.
-
-        :param key_or_list: a single index key or a list of index keys (to
-            construct a multi-field index); keys may be prefixed with a **+**
-            or a **-** to determine the index ordering
-        """
-        index_list = QuerySet._build_index_spec(self._document, key_or_list)
-        self._collection.ensure_index(index_list)
-        return self
-
-    @classmethod
-    def _build_index_spec(cls, doc_cls, key_or_list):
-        """Build a PyMongo index spec from a MongoEngine index spec.
-        """
-        if isinstance(key_or_list, basestring):
-            key_or_list = [key_or_list]
-
-        index_list = []
-        use_types = doc_cls._meta.get('allow_inheritance', True)
-        for key in key_or_list:
-            # Get direction from + or -
-            direction = pymongo.ASCENDING
-            if key.startswith("-"):
-                direction = pymongo.DESCENDING
-            if key.startswith(("+", "-")):
-                    key = key[1:]
-
-            # Use real field name, do it manually because we need field
-            # objects for the next part (list field checking)
-            parts = key.split('.')
-            fields = QuerySet._lookup_field(doc_cls, parts)
-            parts = [field.name for field in fields]
-            key = '.'.join(parts)
-            index_list.append((key, direction))
-
-            # Check if a list field is being used, don't use _types if it is
-            if use_types and not all(f._index_with_types for f in fields):
-                use_types = False
-
-        # If _types is being used, prepend it to every specified index
-        if doc_cls._meta.get('allow_inheritance') and use_types:
-            index_list.insert(0, ('_types', 1))
-
-        return index_list
-
-    def __call__(self, *q_objs, **query):
-        """Filter the selected documents by calling the 
-        :class:`~mongoengine.queryset.QuerySet` with a query.
-
-        :param q_objs: :class:`~mongoengine.queryset.Q` objects to be used in
-            the query 
-        :param query: Django-style query keyword arguments
-        """
-        for q in q_objs:
-            self._where_clauses.append(q.as_js(self._document))
-        query = QuerySet._transform_query(_doc_cls=self._document, **query)
-        self._query.update(query)
-        return self
-        
-    def filter(self, *q_objs, **query):
-        """An alias of :meth:`~mongoengine.queryset.QuerySet.__call__`
-        """
-        return self.__call__(*q_objs, **query)
-
-    @property
-    def _collection(self):
-        """Property that returns the collection object. This allows us to
-        perform operations only if the collection is accessed.
-        """
-        if not self._accessed_collection:
-            self._accessed_collection = True
-
-            # Ensure document-defined indexes are created
-            if self._document._meta['indexes']:
-                for key_or_list in self._document._meta['indexes']:
-                    #self.ensure_index(key_or_list)
-                    self._collection.ensure_index(key_or_list)
-
-            # Ensure indexes created by uniqueness constraints
-            for index in self._document._meta['unique_indexes']:
-                self._collection.ensure_index(index, unique=True)
-
-            # If _types is being used (for polymorphism), it needs an index
-            if '_types' in self._query:
-                self._collection.ensure_index('_types')
-        return self._collection_obj
-
-    @property
-    def _cursor(self):
-        if not self._cursor_obj:
-            self._cursor_obj = self._collection.find(self._query)
-            # Apply where clauses to cursor
-            for js in self._where_clauses:
-                self._cursor_obj.where(js)
-            
-            # apply default ordering
-            if self._document._meta['ordering']:
-                self.order_by(*self._document._meta['ordering'])
-            
-        return self._cursor_obj
-
-    @classmethod
-    def _lookup_field(cls, document, parts):
-        """Lookup a field based on its attribute and return a list containing
-        the field's parents and the field.
-        """
-        if not isinstance(parts, (list, tuple)):
-            parts = [parts]
-        fields = []
-        field = None
-        for field_name in parts:
-            if field is None:
-                # Look up first field from the document
-                field = document._fields[field_name]
-            else:
-                # Look up subfield on the previous field
-                field = field.lookup_member(field_name)
-                if field is None:
-                    raise InvalidQueryError('Cannot resolve field "%s"'
-                                            % field_name)
-            fields.append(field)
-        return fields
-
-    @classmethod
-    def _translate_field_name(cls, doc_cls, field, sep='.'):
-        """Translate a field attribute name to a database field name.
-        """
-        parts = field.split(sep)
-        parts = [f.name for f in QuerySet._lookup_field(doc_cls, parts)]
-        return '.'.join(parts)
-
-    @classmethod
-    def _transform_query(cls, _doc_cls=None, **query):
-        """Transform a query from Django-style format to Mongo format.
-        """
-        operators = ['neq', 'gt', 'gte', 'lt', 'lte', 'in', 'nin', 'mod',
-                     'all', 'size', 'exists']
-
-        mongo_query = {}
-        for key, value in query.items():
-            parts = key.split('__')
-            # Check for an operator and transform to mongo-style if there is
-            op = None
-            if parts[-1] in operators:
-                op = parts.pop()
-
-            if _doc_cls:
-                # Switch field names to proper names [set in Field(name='foo')]
-                fields = QuerySet._lookup_field(_doc_cls, parts)
-                parts = [field.name for field in fields]
-
-                # Convert value to proper value
-                field = fields[-1]
-                if op in (None, 'neq', 'gt', 'gte', 'lt', 'lte'):
-                    value = field.prepare_query_value(value)
-                elif op in ('in', 'nin', 'all'):
-                    # 'in', 'nin' and 'all' require a list of values
-                    value = [field.prepare_query_value(v) for v in value]
-
-            if op:
-                value = {'$' + op: value}
-
-            key = '.'.join(parts)
-            if op is None or key not in mongo_query:
-                mongo_query[key] = value
-            elif key in mongo_query and isinstance(mongo_query[key], dict):
-                mongo_query[key].update(value)
-
-        return mongo_query
-
-    def first(self):
-        """Retrieve the first object matching the query.
-        """
-        try:
-            result = self[0]
-        except IndexError:
-            result = None
-        return result
-
-    def with_id(self, object_id):
-        """Retrieve the object matching the id provided.
-
-        :param object_id: the value for the id of the document to look up
-        """
-        id_field = self._document._meta['id_field']
-        object_id = self._document._fields[id_field].to_mongo(object_id)
-
-        result = self._collection.find_one({'_id': object_id})
-        if result is not None:
-            result = self._document._from_son(result)
-        return result
-
-    def next(self):
-        """Wrap the result in a :class:`~mongoengine.Document` object.
-        """
-        return self._document._from_son(self._cursor.next())
-
-    def count(self):
-        """Count the selected elements in the query.
-        """
-        return self._cursor.count()
-
-    def __len__(self):
-        return self.count()
-
-    def limit(self, n):
-        """Limit the number of returned documents to `n`. This may also be
-        achieved using array-slicing syntax (e.g. ``User.objects[:5]``).
-
-        :param n: the maximum number of objects to return
-        """
-        self._cursor.limit(n)
-        # Return self to allow chaining
-        return self
-
-    def skip(self, n):
-        """Skip `n` documents before returning the results. This may also be
-        achieved using array-slicing syntax (e.g. ``User.objects[5:]``).
-
-        :param n: the number of objects to skip before returning results
-        """
-        self._cursor.skip(n)
-        return self
-
-    def __getitem__(self, key):
-        """Support skip and limit using getitem and slicing syntax.
-        """
-        # Slice provided
-        if isinstance(key, slice):
-            try:
-                self._cursor_obj = self._cursor[key]
-            except IndexError, err:
-                # PyMongo raises an error if key.start == key.stop, catch it,
-                # bin it, kill it. 
-                if key.start >=0 and key.stop >= 0 and key.step is None:
-                    if key.start == key.stop:
-                        self.limit(0)
-                        return self
-                raise err
-            # Allow further QuerySet modifications to be performed
-            return self
-        # Integer index provided
-        elif isinstance(key, int):
-            return self._document._from_son(self._cursor[key])
-
-    def order_by(self, *keys):
-        """Order the :class:`~mongoengine.queryset.QuerySet` by the keys. The
-        order may be specified by prepending each of the keys by a + or a -.
-        Ascending order is assumed.
-
-        :param keys: fields to order the query results by; keys may be
-            prefixed with **+** or **-** to determine the ordering direction
-        """
-        key_list = []
-        for key in keys:
-            direction = pymongo.ASCENDING
-            if key[0] == '-':
-                direction = pymongo.DESCENDING
-            if key[0] in ('-', '+'):
-                key = key[1:]
-            key_list.append((key, direction)) 
-
-        self._cursor.sort(key_list)
-        return self
-        
-    def explain(self, format=False):
-        """Return an explain plan record for the 
-        :class:`~mongoengine.queryset.QuerySet`\ 's cursor.
-
-        :param format: format the plan before returning it
-        """
-
-        plan = self._cursor.explain()
-        if format:
-            import pprint
-            plan = pprint.pformat(plan)
-        return plan
-        
-    def delete(self, safe=False):
-        """Delete the documents matched by the query.
-
-        :param safe: check if the operation succeeded before returning
-        """
-        self._collection.remove(self._query, safe=safe)
-
-    @classmethod
-    def _transform_update(cls, _doc_cls=None, **update):
-        """Transform an update spec from Django-style format to Mongo format.
-        """
-        operators = ['set', 'unset', 'inc', 'dec', 'push', 'push_all', 'pull', 
-                     'pull_all']
-
-        mongo_update = {}
-        for key, value in update.items():
-            parts = key.split('__')
-            # Check for an operator and transform to mongo-style if there is
-            op = None
-            if parts[0] in operators:
-                op = parts.pop(0)
-                # Convert Pythonic names to Mongo equivalents
-                if op in ('push_all', 'pull_all'):
-                    op = op.replace('_all', 'All')
-                elif op == 'dec':
-                    # Support decrement by flipping a positive value's sign
-                    # and using 'inc'
-                    op = 'inc'
-                    if value > 0:
-                        value = -value
-
-            if _doc_cls:
-                # Switch field names to proper names [set in Field(name='foo')]
-                fields = QuerySet._lookup_field(_doc_cls, parts)
-                parts = [field.name for field in fields]
-
-                # Convert value to proper value
-                field = fields[-1]
-                if op in (None, 'set', 'unset', 'push', 'pull'):
-                    value = field.prepare_query_value(value)
-                elif op in ('pushAll', 'pullAll'):
-                    value = [field.prepare_query_value(v) for v in value]
-
-            key = '.'.join(parts)
-
-            if op:
-                value = {key: value}
-                key = '$' + op
-
-            if op is None or key not in mongo_update:
-                mongo_update[key] = value
-            elif key in mongo_update and isinstance(mongo_update[key], dict):
-                mongo_update[key].update(value)
-
-        return mongo_update
-
-    def update(self, safe_update=True, **update):
-        """Perform an atomic update on the fields matched by the query.
-
-        :param safe: check if the operation succeeded before returning
-        :param update: Django-style update keyword arguments
-
-        .. versionadded:: 0.2
-        """
-        if pymongo.version < '1.1.1':
-            raise OperationError('update() method requires PyMongo 1.1.1+')
-
-        update = QuerySet._transform_update(self._document, **update)
-        try:
-            self._collection.update(self._query, update, safe=safe_update, 
-                                    multi=True)
-        except pymongo.errors.OperationFailure, err:
-            if str(err) == 'multi not coded yet':
-                raise OperationError('update() method requires MongoDB 1.1.3+')
-            raise OperationError('Update failed (%s)' % str(err))
-
-    def update_one(self, safe_update=True, **update):
-        """Perform an atomic update on first field matched by the query.
-
-        :param safe: check if the operation succeeded before returning
-        :param update: Django-style update keyword arguments
-
-        .. versionadded:: 0.2
-        """
-        update = QuerySet._transform_update(self._document, **update)
-        try:
-            # Explicitly provide 'multi=False' to newer versions of PyMongo
-            # as the default may change to 'True'
-            if pymongo.version >= '1.1.1':
-                self._collection.update(self._query, update, safe=safe_update, 
-                                        multi=False)
-            else:
-                # Older versions of PyMongo don't support 'multi'
-                self._collection.update(self._query, update, safe=safe_update)
-        except pymongo.errors.OperationFailure, e:
-            raise OperationError('Update failed [%s]' % str(e))
-
-    def __iter__(self):
-        return self
-
-    def exec_js(self, code, *fields, **options):
-        """Execute a Javascript function on the server. A list of fields may be
-        provided, which will be translated to their correct names and supplied
-        as the arguments to the function. A few extra variables are added to
-        the function's scope: ``collection``, which is the name of the 
-        collection in use; ``query``, which is an object representing the 
-        current query; and ``options``, which is an object containing any
-        options specified as keyword arguments.
-
-        :param code: a string of Javascript code to execute
-        :param fields: fields that you will be using in your function, which
-            will be passed in to your function as arguments
-        :param options: options that you want available to the function 
-            (accessed in Javascript through the ``options`` object)
-        """
-        fields = [QuerySet._translate_field_name(self._document, f)
-                  for f in fields]
-        collection = self._document._meta['collection']
-        scope = {
-            'collection': collection,
-            'query': self._query,
-            'options': options or {},
-        }
-        code = pymongo.code.Code(code, scope=scope)
-
-        db = _get_db()
-        return db.eval(code, *fields)
-
-    def sum(self, field):
-        """Sum over the values of the specified field.
-
-        :param field: the field to sum over; use dot-notation to refer to
-            embedded document fields
-        """
-        sum_func = """
-            function(sumField) {
-                var total = 0.0;
-                db[collection].find(query).forEach(function(doc) {
-                    total += (doc[sumField] || 0.0);
-                });
-                return total;
-            }
-        """
-        return self.exec_js(sum_func, field)
-
-    def average(self, field):
-        """Average over the values of the specified field.
-
-        :param field: the field to average over; use dot-notation to refer to
-            embedded document fields
-        """
-        average_func = """
-            function(averageField) {
-                var total = 0.0;
-                var num = 0;
-                db[collection].find(query).forEach(function(doc) {
-                    if (doc[averageField]) {
-                        total += doc[averageField];
-                        num += 1;
-                    }
-                });
-                return total / num;
-            }
-        """
-        return self.exec_js(average_func, field)
-
-    def item_frequencies(self, list_field, normalize=False):
-        """Returns a dictionary of all items present in a list field across
-        the whole queried set of documents, and their corresponding frequency.
-        This is useful for generating tag clouds, or searching documents. 
-
-        :param list_field: the list field to use
-        :param normalize: normalize the results so they add to 1.0
-        """
-        freq_func = """
-            function(listField) {
-                if (options.normalize) {
-                    var total = 0.0;
-                    db[collection].find(query).forEach(function(doc) {
-                        total += doc[listField].length;
-                    });
-                }
-
-                var frequencies = {};
-                var inc = 1.0;
-                if (options.normalize) {
-                    inc /= total;
-                }
-                db[collection].find(query).forEach(function(doc) {
-                    doc[listField].forEach(function(item) {
-                        frequencies[item] = inc + (frequencies[item] || 0);
-                    });
-                });
-                return frequencies;
-            }
-        """
-        return self.exec_js(freq_func, list_field, normalize=normalize)
-
-    def __repr__(self):
-        data = list(self[:REPR_OUTPUT_SIZE + 1])
-        if len(data) > REPR_OUTPUT_SIZE:
-            data[-1] = "...(remaining elements truncated)..."
-        return repr(data)
-
-class InvalidCollectionError(Exception):
-    pass
-
-
-class QuerySetManager(object):
-
-    def __init__(self, manager_func=None):
-        self._manager_func = manager_func
-        self._collection = None
-
-    def __get__(self, instance, owner):
-        """Descriptor for instantiating a new QuerySet object when 
-        Document.objects is accessed.
-        """
-        if instance is not None:
-            # Document class being used rather than a document object
-            return self
-
-        if self._collection is None:
-            db = _get_db()
-            collection = owner._meta['collection']
-
-            # Create collection as a capped collection if specified
-            if owner._meta['max_size'] or owner._meta['max_documents']:
-                # Get max document limit and max byte size from meta
-                max_size = owner._meta['max_size'] or 10000000 # 10MB default
-                max_documents = owner._meta['max_documents']
-
-                if collection in db.collection_names():
-                    self._collection = db[collection]
-                    # The collection already exists, check if its capped 
-                    # options match the specified capped options
-                    options = self._collection.options()
-                    if options.get('max') != max_documents or \
-                       options.get('size') != max_size:
-                        msg = ('Cannot create collection "%s" as a capped '
-                               'collection as it already exists') % collection
-                        raise InvalidCollectionError(msg)
-                else:
-                    # Create the collection as a capped collection
-                    opts = {'capped': True, 'size': max_size}
-                    if max_documents:
-                        opts['max'] = max_documents
-                    self._collection = db.create_collection(collection, opts)
-            else:
-                self._collection = db[collection]
-        
-        # owner is the document that contains the QuerySetManager
-        queryset = QuerySet(owner, self._collection)
-        if self._manager_func:
-            queryset = self._manager_func(queryset)
-        return queryset
-
-def queryset_manager(func):
-    """Decorator that allows you to define custom QuerySet managers on 
-    :class:`~mongoengine.Document` classes. The manager must be a function that
-    accepts a :class:`~mongoengine.queryset.QuerySet` as its only argument, and
-    returns a :class:`~mongoengine.queryset.QuerySet`, probably the same one 
-    but modified in some way.
-    """
-    return QuerySetManager(func)

mongoengine/queryset/__init__.py

@@ -0,0 +1,11 @@
+from mongoengine.errors import (DoesNotExist, MultipleObjectsReturned,
+                                InvalidQueryError, OperationError,
+                                NotUniqueError)
+from mongoengine.queryset.field_list import *
+from mongoengine.queryset.manager import *
+from mongoengine.queryset.queryset import *
+from mongoengine.queryset.transform import *
+from mongoengine.queryset.visitor import *
+
+__all__ = (field_list.__all__ + manager.__all__ + queryset.__all__ +
+           transform.__all__ + visitor.__all__)

mongoengine/queryset/field_list.py

@@ -0,0 +1,86 @@
+
+__all__ = ('QueryFieldList',)
+
+
+class QueryFieldList(object):
+    """Object that handles combinations of .only() and .exclude() calls"""
+    ONLY = 1
+    EXCLUDE = 0
+
+    def __init__(self, fields=None, value=ONLY, always_include=None, _only_called=False):
+        """The QueryFieldList builder
+
+        :param fields: A list of fields used in `.only()` or `.exclude()`
+        :param value: How to handle the fields; either `ONLY` or `EXCLUDE`
+        :param always_include: Any fields to always_include eg `_cls`
+        :param _only_called: Has `.only()` been called?  If so its a set of fields
+           otherwise it performs a union.
+        """
+        self.value = value
+        self.fields = set(fields or [])
+        self.always_include = set(always_include or [])
+        self._id = None
+        self._only_called = _only_called
+        self.slice = {}
+
+    def __add__(self, f):
+        if isinstance(f.value, dict):
+            for field in f.fields:
+                self.slice[field] = f.value
+            if not self.fields:
+                self.fields = f.fields
+        elif not self.fields:
+            self.fields = f.fields
+            self.value = f.value
+            self.slice = {}
+        elif self.value is self.ONLY and f.value is self.ONLY:
+            self._clean_slice()
+            if self._only_called:
+                self.fields = self.fields.union(f.fields)
+            else:
+                self.fields = f.fields
+        elif self.value is self.EXCLUDE and f.value is self.EXCLUDE:
+            self.fields = self.fields.union(f.fields)
+            self._clean_slice()
+        elif self.value is self.ONLY and f.value is self.EXCLUDE:
+            self.fields -= f.fields
+            self._clean_slice()
+        elif self.value is self.EXCLUDE and f.value is self.ONLY:
+            self.value = self.ONLY
+            self.fields = f.fields - self.fields
+            self._clean_slice()
+
+        if '_id' in f.fields:
+            self._id = f.value
+
+        if self.always_include:
+            if self.value is self.ONLY and self.fields:
+                if sorted(self.slice.keys()) != sorted(self.fields):
+                    self.fields = self.fields.union(self.always_include)
+            else:
+                self.fields -= self.always_include
+
+        if getattr(f, '_only_called', False):
+            self._only_called = True
+        return self
+
+    def __nonzero__(self):
+        return bool(self.fields)
+
+    def as_dict(self):
+        field_list = dict((field, self.value) for field in self.fields)
+        if self.slice:
+            field_list.update(self.slice)
+        if self._id is not None:
+            field_list['_id'] = self._id
+        return field_list
+
+    def reset(self):
+        self.fields = set([])
+        self.slice = {}
+        self.value = self.ONLY
+
+    def _clean_slice(self):
+        if self.slice:
+            for field in set(self.slice.keys()) - self.fields:
+                del self.slice[field]

mongoengine/queryset/manager.py

@@ -0,0 +1,57 @@
+from functools import partial
+from mongoengine.queryset.queryset import QuerySet
+
+__all__ = ('queryset_manager', 'QuerySetManager')
+
+
+class QuerySetManager(object):
+    """
+    The default QuerySet Manager.
+
+    Custom QuerySet Manager functions can extend this class and users can
+    add extra queryset functionality.  Any custom manager methods must accept a
+    :class:`~mongoengine.Document` class as its first argument, and a
+    :class:`~mongoengine.queryset.QuerySet` as its second argument.
+
+    The method function should return a :class:`~mongoengine.queryset.QuerySet`
+    , probably the same one that was passed in, but modified in some way.
+    """
+
+    get_queryset = None
+    default = QuerySet
+
+    def __init__(self, queryset_func=None):
+        if queryset_func:
+            self.get_queryset = queryset_func
+
+    def __get__(self, instance, owner):
+        """Descriptor for instantiating a new QuerySet object when
+        Document.objects is accessed.
+        """
+        if instance is not None:
+            # Document class being used rather than a document object
+            return self
+
+        # owner is the document that contains the QuerySetManager
+        queryset_class = owner._meta.get('queryset_class', self.default)
+        queryset = queryset_class(owner, owner._get_collection())
+        if self.get_queryset:
+            arg_count = self.get_queryset.func_code.co_argcount
+            if arg_count == 1:
+                queryset = self.get_queryset(queryset)
+            elif arg_count == 2:
+                queryset = self.get_queryset(owner, queryset)
+            else:
+                queryset = partial(self.get_queryset, owner, queryset)
+        return queryset
+
+
+def queryset_manager(func):
+    """Decorator that allows you to define custom QuerySet managers on
+    :class:`~mongoengine.Document` classes. The manager must be a function that
+    accepts a :class:`~mongoengine.Document` class as its first argument, and a
+    :class:`~mongoengine.queryset.QuerySet` as its second argument. The method
+    function should return a :class:`~mongoengine.queryset.QuerySet`, probably
+    the same one that was passed in, but modified in some way.
+    """
+    return QuerySetManager(func)

mongoengine/queryset/queryset.py

@@ -0,0 +1,157 @@
+from mongoengine.errors import OperationError
+from mongoengine.queryset.base import (BaseQuerySet, DO_NOTHING, NULLIFY,
+                                       CASCADE, DENY, PULL)
+
+__all__ = ('QuerySet', 'QuerySetNoCache', 'DO_NOTHING', 'NULLIFY', 'CASCADE',
+           'DENY', 'PULL')
+
+# The maximum number of items to display in a QuerySet.__repr__
+REPR_OUTPUT_SIZE = 20
+ITER_CHUNK_SIZE = 100
+
+
+class QuerySet(BaseQuerySet):
+    """The default queryset, that builds queries and handles a set of results
+    returned from a query.
+
+    Wraps a MongoDB cursor, providing :class:`~mongoengine.Document` objects as
+    the results.
+    """
+
+    _has_more = True
+    _len = None
+    _result_cache = None
+
+    def __iter__(self):
+        """Iteration utilises a results cache which iterates the cursor
+        in batches of ``ITER_CHUNK_SIZE``.
+
+        If ``self._has_more`` the cursor hasn't been exhausted so cache then
+        batch.  Otherwise iterate the result_cache.
+        """
+        self._iter = True
+        if self._has_more:
+            return self._iter_results()
+
+        # iterating over the cache.
+        return iter(self._result_cache)
+
+    def __len__(self):
+        """Since __len__ is called quite frequently (for example, as part of
+        list(qs) we populate the result cache and cache the length.
+        """
+        if self._len is not None:
+            return self._len
+        if self._has_more:
+            # populate the cache
+            list(self._iter_results())
+
+        self._len = len(self._result_cache)
+        return self._len
+
+    def __repr__(self):
+        """Provides the string representation of the QuerySet
+        """
+        if self._iter:
+            return '.. queryset mid-iteration ..'
+
+        self._populate_cache()
+        data = self._result_cache[:REPR_OUTPUT_SIZE + 1]
+        if len(data) > REPR_OUTPUT_SIZE:
+            data[-1] = "...(remaining elements truncated)..."
+        return repr(data)
+
+
+    def _iter_results(self):
+        """A generator for iterating over the result cache.
+
+        Also populates the cache if there are more possible results to yield.
+        Raises StopIteration when there are no more results"""
+        if self._result_cache is None:
+            self._result_cache = []
+        pos = 0
+        while True:
+            upper = len(self._result_cache)
+            while pos < upper:
+                yield self._result_cache[pos]
+                pos = pos + 1
+            if not self._has_more:
+                raise StopIteration
+            if len(self._result_cache) <= pos:
+                self._populate_cache()
+
+    def _populate_cache(self):
+        """
+        Populates the result cache with ``ITER_CHUNK_SIZE`` more entries
+        (until the cursor is exhausted).
+        """
+        if self._result_cache is None:
+            self._result_cache = []
+        if self._has_more:
+            try:
+                for i in xrange(ITER_CHUNK_SIZE):
+                    self._result_cache.append(self.next())
+            except StopIteration:
+                self._has_more = False
+
+    def count(self, with_limit_and_skip=True):
+        """Count the selected elements in the query.
+
+        :param with_limit_and_skip (optional): take any :meth:`limit` or
+            :meth:`skip` that has been applied to this cursor into account when
+            getting the count
+        """
+        if with_limit_and_skip is False:
+            return super(QuerySet, self).count(with_limit_and_skip)
+
+        if self._len is None:
+            self._len = super(QuerySet, self).count(with_limit_and_skip)
+
+        return self._len
+
+    def no_cache(self):
+        """Convert to a non_caching queryset
+
+        .. versionadded:: 0.8.3 Convert to non caching queryset
+        """
+        if self._result_cache is not None:
+            raise OperationError("QuerySet already cached")
+        return self.clone_into(QuerySetNoCache(self._document, self._collection))
+
+
+class QuerySetNoCache(BaseQuerySet):
+    """A non caching QuerySet"""
+
+    def cache(self):
+        """Convert to a caching queryset
+
+        .. versionadded:: 0.8.3 Convert to caching queryset
+        """
+        return self.clone_into(QuerySet(self._document, self._collection))
+
+    def __repr__(self):
+        """Provides the string representation of the QuerySet
+
+        .. versionchanged:: 0.6.13 Now doesnt modify the cursor
+        """
+        if self._iter:
+            return '.. queryset mid-iteration ..'
+
+        data = []
+        for i in xrange(REPR_OUTPUT_SIZE + 1):
+            try:
+                data.append(self.next())
+            except StopIteration:
+                break
+        if len(data) > REPR_OUTPUT_SIZE:
+            data[-1] = "...(remaining elements truncated)..."
+
+        self.rewind()
+        return repr(data)
+
+    def __iter__(self):
+        queryset = self
+        if queryset._iter:
+            queryset = self.clone()
+        queryset.rewind()
+        return queryset

mongoengine/queryset/transform.py

@@ -0,0 +1,339 @@
+from collections import defaultdict
+
+import pymongo
+from bson import SON
+
+from mongoengine.common import _import_class
+from mongoengine.errors import InvalidQueryError, LookUpError
+
+__all__ = ('query', 'update')
+
+
+COMPARISON_OPERATORS = ('ne', 'gt', 'gte', 'lt', 'lte', 'in', 'nin', 'mod',
+                        'all', 'size', 'exists', 'not')
+GEO_OPERATORS        = ('within_distance', 'within_spherical_distance',
+                        'within_box', 'within_polygon', 'near', 'near_sphere',
+                        'max_distance', 'geo_within', 'geo_within_box',
+                        'geo_within_polygon', 'geo_within_center',
+                        'geo_within_sphere', 'geo_intersects')
+STRING_OPERATORS     = ('contains', 'icontains', 'startswith',
+                        'istartswith', 'endswith', 'iendswith',
+                        'exact', 'iexact')
+CUSTOM_OPERATORS     = ('match',)
+MATCH_OPERATORS      = (COMPARISON_OPERATORS + GEO_OPERATORS +
+                        STRING_OPERATORS + CUSTOM_OPERATORS)
+
+UPDATE_OPERATORS     = ('set', 'unset', 'inc', 'dec', 'pop', 'push',
+                        'push_all', 'pull', 'pull_all', 'add_to_set',
+                        'set_on_insert')
+
+
+def query(_doc_cls=None, _field_operation=False, **query):
+    """Transform a query from Django-style format to Mongo format.
+    """
+    mongo_query = {}
+    merge_query = defaultdict(list)
+    for key, value in sorted(query.items()):
+        if key == "__raw__":
+            mongo_query.update(value)
+            continue
+
+        parts = key.split('__')
+        indices = [(i, p) for i, p in enumerate(parts) if p.isdigit()]
+        parts = [part for part in parts if not part.isdigit()]
+        # Check for an operator and transform to mongo-style if there is
+        op = None
+        if len(parts) > 1 and parts[-1] in MATCH_OPERATORS:
+            op = parts.pop()
+
+        negate = False
+        if len(parts) > 1 and parts[-1] == 'not':
+            parts.pop()
+            negate = True
+
+        if _doc_cls:
+            # Switch field names to proper names [set in Field(name='foo')]
+            try:
+                fields = _doc_cls._lookup_field(parts)
+            except Exception, e:
+                raise InvalidQueryError(e)
+            parts = []
+
+            cleaned_fields = []
+            for field in fields:
+                append_field = True
+                if isinstance(field, basestring):
+                    parts.append(field)
+                    append_field = False
+                else:
+                    parts.append(field.db_field)
+                if append_field:
+                    cleaned_fields.append(field)
+
+            # Convert value to proper value
+            field = cleaned_fields[-1]
+
+            singular_ops = [None, 'ne', 'gt', 'gte', 'lt', 'lte', 'not']
+            singular_ops += STRING_OPERATORS
+            if op in singular_ops:
+                if isinstance(field, basestring):
+                    if (op in STRING_OPERATORS and
+                       isinstance(value, basestring)):
+                        StringField = _import_class('StringField')
+                        value = StringField.prepare_query_value(op, value)
+                    else:
+                        value = field
+                else:
+                    value = field.prepare_query_value(op, value)
+            elif op in ('in', 'nin', 'all', 'near') and not isinstance(value, dict):
+                # 'in', 'nin' and 'all' require a list of values
+                value = [field.prepare_query_value(op, v) for v in value]
+
+        # if op and op not in COMPARISON_OPERATORS:
+        if op:
+            if op in GEO_OPERATORS:
+                value = _geo_operator(field, op, value)
+            elif op in CUSTOM_OPERATORS:
+                if op == 'match':
+                    value = field.prepare_query_value(op, value)
+                    value = {"$elemMatch": value}
+                else:
+                    NotImplementedError("Custom method '%s' has not "
+                                        "been implemented" % op)
+            elif op not in STRING_OPERATORS:
+                value = {'$' + op: value}
+
+        if negate:
+            value = {'$not': value}
+
+        for i, part in indices:
+            parts.insert(i, part)
+        key = '.'.join(parts)
+        if op is None or key not in mongo_query:
+            mongo_query[key] = value
+        elif key in mongo_query:
+            if key in mongo_query and isinstance(mongo_query[key], dict):
+                mongo_query[key].update(value)
+                # $maxDistance needs to come last - convert to SON
+                if '$maxDistance' in mongo_query[key]:
+                    value_dict = mongo_query[key]
+                    value_son = SON()
+                    for k, v in value_dict.iteritems():
+                        if k == '$maxDistance':
+                            continue
+                        value_son[k] = v
+                    value_son['$maxDistance'] = value_dict['$maxDistance']
+                    mongo_query[key] = value_son
+            else:
+                # Store for manually merging later
+                merge_query[key].append(value)
+
+    # The queryset has been filter in such a way we must manually merge
+    for k, v in merge_query.items():
+        merge_query[k].append(mongo_query[k])
+        del mongo_query[k]
+        if isinstance(v, list):
+            value = [{k: val} for val in v]
+            if '$and' in mongo_query.keys():
+                mongo_query['$and'].append(value)
+            else:
+                mongo_query['$and'] = value
+
+    return mongo_query
+
+
+def update(_doc_cls=None, **update):
+    """Transform an update spec from Django-style format to Mongo format.
+    """
+    mongo_update = {}
+    for key, value in update.items():
+        if key == "__raw__":
+            mongo_update.update(value)
+            continue
+        parts = key.split('__')
+        # Check for an operator and transform to mongo-style if there is
+        op = None
+        if parts[0] in UPDATE_OPERATORS:
+            op = parts.pop(0)
+            # Convert Pythonic names to Mongo equivalents
+            if op in ('push_all', 'pull_all'):
+                op = op.replace('_all', 'All')
+            elif op == 'dec':
+                # Support decrement by flipping a positive value's sign
+                # and using 'inc'
+                op = 'inc'
+                if value > 0:
+                    value = -value
+            elif op == 'add_to_set':
+                op = 'addToSet'
+            elif op == 'set_on_insert':
+                op = "setOnInsert"
+
+        match = None
+        if parts[-1] in COMPARISON_OPERATORS:
+            match = parts.pop()
+
+        if _doc_cls:
+            # Switch field names to proper names [set in Field(name='foo')]
+            try:
+                fields = _doc_cls._lookup_field(parts)
+            except Exception, e:
+                raise InvalidQueryError(e)
+            parts = []
+
+            cleaned_fields = []
+            appended_sub_field = False
+            for field in fields:
+                append_field = True
+                if isinstance(field, basestring):
+                    # Convert the S operator to $
+                    if field == 'S':
+                        field = '$'
+                    parts.append(field)
+                    append_field = False
+                else:
+                    parts.append(field.db_field)
+                if append_field:
+                    appended_sub_field = False
+                    cleaned_fields.append(field)
+                    if hasattr(field, 'field'):
+                        cleaned_fields.append(field.field)
+                        appended_sub_field = True
+
+            # Convert value to proper value
+            if appended_sub_field:
+                field = cleaned_fields[-2]
+            else:
+                field = cleaned_fields[-1]
+
+            if op in (None, 'set', 'push', 'pull'):
+                if field.required or value is not None:
+                    value = field.prepare_query_value(op, value)
+            elif op in ('pushAll', 'pullAll'):
+                value = [field.prepare_query_value(op, v) for v in value]
+            elif op in ('addToSet', 'setOnInsert'):
+                if isinstance(value, (list, tuple, set)):
+                    value = [field.prepare_query_value(op, v) for v in value]
+                elif field.required or value is not None:
+                    value = field.prepare_query_value(op, value)
+            elif op == "unset":
+                value = 1
+
+        if match:
+            match = '$' + match
+            value = {match: value}
+
+        key = '.'.join(parts)
+
+        if not op:
+            raise InvalidQueryError("Updates must supply an operation "
+                                    "eg: set__FIELD=value")
+
+        if 'pull' in op and '.' in key:
+            # Dot operators don't work on pull operations
+            # unless they point to a list field
+            # Otherwise it uses nested dict syntax
+            if op == 'pullAll':
+                raise InvalidQueryError("pullAll operations only support "
+                                        "a single field depth")
+
+            # Look for the last list field and use dot notation until there
+            field_classes = [c.__class__ for c in cleaned_fields]
+            field_classes.reverse()
+            ListField = _import_class('ListField')
+            if ListField in field_classes:
+                # Join all fields via dot notation to the last ListField
+                # Then process as normal
+                last_listField = len(cleaned_fields) - field_classes.index(ListField)
+                key = ".".join(parts[:last_listField])
+                parts = parts[last_listField:]
+                parts.insert(0, key)
+
+            parts.reverse()
+            for key in parts:
+                value = {key: value}
+        elif op == 'addToSet' and isinstance(value, list):
+            value = {key: {"$each": value}}
+        else:
+            value = {key: value}
+        key = '$' + op
+
+        if key not in mongo_update:
+            mongo_update[key] = value
+        elif key in mongo_update and isinstance(mongo_update[key], dict):
+            mongo_update[key].update(value)
+
+    return mongo_update
+
+
+def _geo_operator(field, op, value):
+    """Helper to return the query for a given geo query"""
+    if field._geo_index == pymongo.GEO2D:
+        if op == "within_distance":
+            value = {'$within': {'$center': value}}
+        elif op == "within_spherical_distance":
+            value = {'$within': {'$centerSphere': value}}
+        elif op == "within_polygon":
+            value = {'$within': {'$polygon': value}}
+        elif op == "near":
+            value = {'$near': value}
+        elif op == "near_sphere":
+            value = {'$nearSphere': value}
+        elif op == 'within_box':
+            value = {'$within': {'$box': value}}
+        elif op == "max_distance":
+            value = {'$maxDistance': value}
+        else:
+            raise NotImplementedError("Geo method '%s' has not "
+                                      "been implemented for a GeoPointField" % op)
+    else:
+        if op == "geo_within":
+            value = {"$geoWithin": _infer_geometry(value)}
+        elif op == "geo_within_box":
+            value = {"$geoWithin": {"$box": value}}
+        elif op == "geo_within_polygon":
+            value = {"$geoWithin": {"$polygon": value}}
+        elif op == "geo_within_center":
+            value = {"$geoWithin": {"$center": value}}
+        elif op == "geo_within_sphere":
+            value = {"$geoWithin": {"$centerSphere": value}}
+        elif op == "geo_intersects":
+            value = {"$geoIntersects": _infer_geometry(value)}
+        elif op == "near":
+            value = {'$near': _infer_geometry(value)}
+        elif op == "max_distance":
+            value = {'$maxDistance': value}
+        else:
+            raise NotImplementedError("Geo method '%s' has not "
+                                      "been implemented for a %s " % (op, field._name))
+    return value
+
+
+def _infer_geometry(value):
+    """Helper method that tries to infer the $geometry shape for a given value"""
+    if isinstance(value, dict):
+        if "$geometry" in value:
+            return value
+        elif 'coordinates' in value and 'type' in value:
+            return {"$geometry": value}
+        raise InvalidQueryError("Invalid $geometry dictionary should have "
+                                "type and coordinates keys")
+    elif isinstance(value, (list, set)):
+        try:
+            value[0][0][0]
+            return {"$geometry": {"type": "Polygon", "coordinates": value}}
+        except:
+            pass
+        try:
+            value[0][0]
+            return {"$geometry": {"type": "LineString", "coordinates": value}}
+        except:
+            pass
+        try:
+            value[0]
+            return {"$geometry": {"type": "Point", "coordinates": value}}
+        except:
+            pass
+
+    raise InvalidQueryError("Invalid $geometry data. Can be either a dictionary "
+                            "or (nested) lists of coordinate(s)")

mongoengine/queryset/visitor.py

@@ -0,0 +1,161 @@
+import copy
+
+from mongoengine.errors import InvalidQueryError
+from mongoengine.python_support import product, reduce
+
+from mongoengine.queryset import transform
+
+__all__ = ('Q',)
+
+
+class QNodeVisitor(object):
+    """Base visitor class for visiting Q-object nodes in a query tree.
+    """
+
+    def visit_combination(self, combination):
+        """Called by QCombination objects.
+        """
+        return combination
+
+    def visit_query(self, query):
+        """Called by (New)Q objects.
+        """
+        return query
+
+
+class DuplicateQueryConditionsError(InvalidQueryError):
+    pass
+
+
+class SimplificationVisitor(QNodeVisitor):
+    """Simplifies query trees by combinging unnecessary 'and' connection nodes
+    into a single Q-object.
+    """
+
+    def visit_combination(self, combination):
+        if combination.operation == combination.AND:
+            # The simplification only applies to 'simple' queries
+            if all(isinstance(node, Q) for node in combination.children):
+                queries = [n.query for n in combination.children]
+                try:
+                    return Q(**self._query_conjunction(queries))
+                except DuplicateQueryConditionsError:
+                    # Cannot be simplified
+                    pass
+        return combination
+
+    def _query_conjunction(self, queries):
+        """Merges query dicts - effectively &ing them together.
+        """
+        query_ops = set()
+        combined_query = {}
+        for query in queries:
+            ops = set(query.keys())
+            # Make sure that the same operation isn't applied more than once
+            # to a single field
+            intersection = ops.intersection(query_ops)
+            if intersection:
+                raise DuplicateQueryConditionsError()
+
+            query_ops.update(ops)
+            combined_query.update(copy.deepcopy(query))
+        return combined_query
+
+
+class QueryCompilerVisitor(QNodeVisitor):
+    """Compiles the nodes in a query tree to a PyMongo-compatible query
+    dictionary.
+    """
+
+    def __init__(self, document):
+        self.document = document
+
+    def visit_combination(self, combination):
+        operator = "$and"
+        if combination.operation == combination.OR:
+            operator = "$or"
+        return {operator: combination.children}
+
+    def visit_query(self, query):
+        return transform.query(self.document, **query.query)
+
+
+class QNode(object):
+    """Base class for nodes in query trees.
+    """
+
+    AND = 0
+    OR = 1
+
+    def to_query(self, document):
+        query = self.accept(SimplificationVisitor())
+        query = query.accept(QueryCompilerVisitor(document))
+        return query
+
+    def accept(self, visitor):
+        raise NotImplementedError
+
+    def _combine(self, other, operation):
+        """Combine this node with another node into a QCombination object.
+        """
+        if getattr(other, 'empty', True):
+            return self
+
+        if self.empty:
+            return other
+
+        return QCombination(operation, [self, other])
+
+    @property
+    def empty(self):
+        return False
+
+    def __or__(self, other):
+        return self._combine(other, self.OR)
+
+    def __and__(self, other):
+        return self._combine(other, self.AND)
+
+
+class QCombination(QNode):
+    """Represents the combination of several conditions by a given logical
+    operator.
+    """
+
+    def __init__(self, operation, children):
+        self.operation = operation
+        self.children = []
+        for node in children:
+            # If the child is a combination of the same type, we can merge its
+            # children directly into this combinations children
+            if isinstance(node, QCombination) and node.operation == operation:
+                self.children += node.children
+            else:
+                self.children.append(node)
+
+    def accept(self, visitor):
+        for i in range(len(self.children)):
+            if isinstance(self.children[i], QNode):
+                self.children[i] = self.children[i].accept(visitor)
+
+        return visitor.visit_combination(self)
+
+    @property
+    def empty(self):
+        return not bool(self.children)
+
+
+class Q(QNode):
+    """A simple query object, used in a query tree to build up more complex
+    query structures.
+    """
+
+    def __init__(self, **query):
+        self.query = query
+
+    def accept(self, visitor):
+        return visitor.visit_query(self)
+
+    @property
+    def empty(self):
+        return not bool(self.query)

mongoengine/signals.py

@@ -0,0 +1,47 @@
+# -*- coding: utf-8 -*-
+
+__all__ = ['pre_init', 'post_init', 'pre_save', 'pre_save_post_validation',
+           'post_save', 'pre_delete', 'post_delete']
+
+signals_available = False
+try:
+    from blinker import Namespace
+    signals_available = True
+except ImportError:
+    class Namespace(object):
+        def signal(self, name, doc=None):
+            return _FakeSignal(name, doc)
+
+    class _FakeSignal(object):
+        """If blinker is unavailable, create a fake class with the same
+        interface that allows sending of signals but will fail with an
+        error on anything else.  Instead of doing anything on send, it
+        will just ignore the arguments and do nothing instead.
+        """
+
+        def __init__(self, name, doc=None):
+            self.name = name
+            self.__doc__ = doc
+
+        def _fail(self, *args, **kwargs):
+            raise RuntimeError('signalling support is unavailable '
+                               'because the blinker library is '
+                               'not installed.')
+        send = lambda *a, **kw: None
+        connect = disconnect = has_receivers_for = receivers_for = \
+            temporarily_connected_to = _fail
+        del _fail
+
+# the namespace for code signals.  If you are not mongoengine code, do
+# not put signals in here.  Create your own namespace instead.
+_signals = Namespace()
+
+pre_init = _signals.signal('pre_init')
+post_init = _signals.signal('post_init')
+pre_save = _signals.signal('pre_save')
+pre_save_post_validation = _signals.signal('pre_save_post_validation')
+post_save = _signals.signal('post_save')
+pre_delete = _signals.signal('pre_delete')
+post_delete = _signals.signal('post_delete')
+pre_bulk_insert = _signals.signal('pre_bulk_insert')
+post_bulk_insert = _signals.signal('post_bulk_insert')

python-mongoengine.spec

@@ -0,0 +1,54 @@
+# sitelib for noarch packages, sitearch for others (remove the unneeded one)
+%{!?python_sitelib: %global python_sitelib %(%{__python} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")}
+%{!?python_sitearch: %global python_sitearch %(%{__python} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib(1))")}
+
+%define srcname mongoengine
+
+Name:           python-%{srcname}
+Version:        0.8.4
+Release:        1%{?dist}
+Summary:        A Python Document-Object Mapper for working with MongoDB
+
+Group:          Development/Libraries
+License:        MIT
+URL:            https://github.com/MongoEngine/mongoengine
+Source0:        %{srcname}-%{version}.tar.bz2
+
+BuildRequires:  python-devel
+BuildRequires:  python-setuptools
+
+Requires:       mongodb
+Requires:       pymongo
+Requires:       python-blinker
+Requires:       python-imaging
+
+
+%description
+MongoEngine is an ORM-like layer on top of PyMongo.
+
+%prep
+%setup -q -n %{srcname}-%{version}
+
+
+%build
+# Remove CFLAGS=... for noarch packages (unneeded)
+CFLAGS="$RPM_OPT_FLAGS" %{__python} setup.py build
+
+
+%install
+rm -rf $RPM_BUILD_ROOT
+%{__python} setup.py install -O1 --skip-build --root $RPM_BUILD_ROOT
+
+%clean
+rm -rf $RPM_BUILD_ROOT
+
+%files
+%defattr(-,root,root,-)
+%doc docs AUTHORS LICENSE README.rst
+# For noarch packages: sitelib
+ %{python_sitelib}/*
+# For arch-specific packages: sitearch
+# %{python_sitearch}/*
+
+%changelog
+* See: http://docs.mongoengine.org/en/latest/changelog.html

requirements.txt

@@ -0,0 +1 @@
+pymongo

setup.cfg

@@ -0,0 +1,11 @@
+[nosetests]
+verbosity = 3
+detailed-errors = 1
+#with-coverage = 1
+#cover-erase = 1
+#cover-html = 1
+#cover-html-dir = ../htmlcov
+#cover-package = mongoengine
+py3where = build
+where = tests
+#tests =  document/__init__.py

setup.py

@@ -1,27 +1,35 @@
-from setuptools import setup, find_packages
 import os
+import sys
+from setuptools import setup, find_packages
 
-DESCRIPTION = "A Python Document-Object Mapper for working with MongoDB"
+# Hack to silence atexit traceback in newer python versions
+try:
+    import multiprocessing
+except ImportError:
+    pass
 
+DESCRIPTION = 'MongoEngine is a Python Object-Document ' + \
+'Mapper for working with MongoDB.'
 LONG_DESCRIPTION = None
 try:
     LONG_DESCRIPTION = open('README.rst').read()
 except:
     pass
 
+
 def get_version(version_tuple):
-    version = '%s.%s' % (version_tuple[0], version_tuple[1])
+    if not isinstance(version_tuple[-1], int):
-    if version_tuple[2]:
+        return '.'.join(map(str, version_tuple[:-1])) + version_tuple[-1]
-        version = '%s.%s' % (version, version_tuple[2])
+    return '.'.join(map(str, version_tuple))
-    return version
 
 # Dirty hack to get version number from monogengine/__init__.py - we can't
 # import it as it depends on PyMongo and PyMongo isn't installed until this
 # file is read
 init = os.path.join(os.path.dirname(__file__), 'mongoengine', '__init__.py')
-version_line = filter(lambda l: l.startswith('VERSION'), open(init))[0]
+version_line = list(filter(lambda l: l.startswith('VERSION'), open(init)))[0]
+
 VERSION = get_version(eval(version_line.split('=')[-1]))
-print VERSION
+print(VERSION)
 
 CLASSIFIERS = [
     'Development Status :: 4 - Beta',
@@ -29,22 +37,42 @@ CLASSIFIERS = [
     'License :: OSI Approved :: MIT License',
     'Operating System :: OS Independent',
     'Programming Language :: Python',
+    "Programming Language :: Python :: 2",
+    "Programming Language :: Python :: 2.6",
+    "Programming Language :: Python :: 2.7",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.1",
+    "Programming Language :: Python :: 3.2",
+    "Programming Language :: Python :: Implementation :: CPython",
     'Topic :: Database',
     'Topic :: Software Development :: Libraries :: Python Modules',
 ]
 
+extra_opts = {"packages": find_packages(exclude=["tests", "tests.*"])}
+if sys.version_info[0] == 3:
+    extra_opts['use_2to3'] = True
+    extra_opts['tests_require'] = ['nose', 'coverage', 'blinker', 'jinja2==2.6', 'django>=1.5.1']
+    if "test" in sys.argv or "nosetests" in sys.argv:
+        extra_opts['packages'] = find_packages()
+        extra_opts['package_data'] = {"tests": ["fields/mongoengine.png", "fields/mongodb_leaf.png"]}
+else:
+    extra_opts['tests_require'] = ['nose', 'coverage', 'blinker', 'django>=1.4.2', 'PIL', 'jinja2>=2.6', 'python-dateutil']
+
 setup(name='mongoengine',
       version=VERSION,
-      packages=find_packages(),
       author='Harry Marr',
       author_email='harry.marr@{nospam}gmail.com',
-      url='http://hmarr.com/mongoengine/',
+      maintainer="Ross Lawley",
+      maintainer_email="ross.lawley@{nospam}gmail.com",
+      url='http://mongoengine.org/',
+      download_url='https://github.com/MongoEngine/mongoengine/tarball/master',
       license='MIT',
       include_package_data=True,
       description=DESCRIPTION,
       long_description=LONG_DESCRIPTION,
       platforms=['any'],
       classifiers=CLASSIFIERS,
-      install_requires=['pymongo'],
+      install_requires=['pymongo>=2.5'],
-      test_suite='tests',
+      test_suite='nose.collector',
+      **extra_opts
 )

tests/__init__.py

@@ -0,0 +1,5 @@
+from all_warnings import AllWarnings
+from document import *
+from queryset import *
+from fields import *
+from migration import *

tests/all_warnings/__init__.py

@@ -0,0 +1,44 @@
+"""
+This test has been put into a module.  This is because it tests warnings that
+only get triggered on first hit.  This way we can ensure its imported into the
+top level and called first by the test suite.
+"""
+import sys
+sys.path[0:0] = [""]
+import unittest
+import warnings
+
+from mongoengine import *
+
+
+__all__ = ('AllWarnings', )
+
+
+class AllWarnings(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.warning_list = []
+        self.showwarning_default = warnings.showwarning
+        warnings.showwarning = self.append_to_warning_list
+
+    def append_to_warning_list(self, message, category, *args):
+        self.warning_list.append({"message": message,
+                                  "category": category})
+
+    def tearDown(self):
+        # restore default handling of warnings
+        warnings.showwarning = self.showwarning_default
+
+    def test_document_collection_syntax_warning(self):
+
+        class NonAbstractBase(Document):
+            meta = {'allow_inheritance': True}
+
+        class InheritedDocumentFailTest(NonAbstractBase):
+            meta = {'collection': 'fail'}
+
+        warning = self.warning_list[0]
+        self.assertEqual(SyntaxWarning, warning["category"])
+        self.assertEqual('non_abstract_base',
+                         InheritedDocumentFailTest._get_collection_name())

tests/document.py

@@ -1,541 +0,0 @@
-import unittest
-import datetime
-import pymongo
-
-from mongoengine import *
-from mongoengine.connection import _get_db
-
-
-class DocumentTest(unittest.TestCase):
-    
-    def setUp(self):
-        connect(db='mongoenginetest')
-        self.db = _get_db()
-
-        class Person(Document):
-            name = StringField()
-            age = IntField()
-        self.Person = Person
-
-    def test_drop_collection(self):
-        """Ensure that the collection may be dropped from the database.
-        """
-        self.Person(name='Test').save()
-
-        collection = self.Person._meta['collection']
-        self.assertTrue(collection in self.db.collection_names())
-
-        self.Person.drop_collection()
-        self.assertFalse(collection in self.db.collection_names())
-
-    def test_definition(self):
-        """Ensure that document may be defined using fields.
-        """
-        name_field = StringField()
-        age_field = IntField()
-
-        class Person(Document):
-            name = name_field
-            age = age_field
-            non_field = True
-        
-        self.assertEqual(Person._fields['name'], name_field)
-        self.assertEqual(Person._fields['age'], age_field)
-        self.assertFalse('non_field' in Person._fields)
-        self.assertTrue('id' in Person._fields)
-        # Test iteration over fields
-        fields = list(Person())
-        self.assertTrue('name' in fields and 'age' in fields)
-        # Ensure Document isn't treated like an actual document
-        self.assertFalse(hasattr(Document, '_fields'))
-
-    def test_get_superclasses(self):
-        """Ensure that the correct list of superclasses is assembled.
-        """
-        class Animal(Document): pass
-        class Fish(Animal): pass
-        class Mammal(Animal): pass
-        class Human(Mammal): pass
-        class Dog(Mammal): pass
-
-        mammal_superclasses = {'Animal': Animal}
-        self.assertEqual(Mammal._superclasses, mammal_superclasses)
-        
-        dog_superclasses = {
-            'Animal': Animal,
-            'Animal.Mammal': Mammal,
-        }
-        self.assertEqual(Dog._superclasses, dog_superclasses)
-
-    def test_get_subclasses(self):
-        """Ensure that the correct list of subclasses is retrieved by the 
-        _get_subclasses method.
-        """
-        class Animal(Document): pass
-        class Fish(Animal): pass
-        class Mammal(Animal): pass
-        class Human(Mammal): pass
-        class Dog(Mammal): pass
-
-        mammal_subclasses = {
-            'Animal.Mammal.Dog': Dog, 
-            'Animal.Mammal.Human': Human
-        }
-        self.assertEqual(Mammal._get_subclasses(), mammal_subclasses)
-        
-        animal_subclasses = {
-            'Animal.Fish': Fish,
-            'Animal.Mammal': Mammal,
-            'Animal.Mammal.Dog': Dog, 
-            'Animal.Mammal.Human': Human
-        }
-        self.assertEqual(Animal._get_subclasses(), animal_subclasses)
-
-    def test_polymorphic_queries(self):
-        """Ensure that the correct subclasses are returned from a query"""
-        class Animal(Document): pass
-        class Fish(Animal): pass
-        class Mammal(Animal): pass
-        class Human(Mammal): pass
-        class Dog(Mammal): pass
-
-        Animal().save()
-        Fish().save()
-        Mammal().save()
-        Human().save()
-        Dog().save()
-
-        classes = [obj.__class__ for obj in Animal.objects]
-        self.assertEqual(classes, [Animal, Fish, Mammal, Human, Dog])
-
-        classes = [obj.__class__ for obj in Mammal.objects]
-        self.assertEqual(classes, [Mammal, Human, Dog])
-
-        classes = [obj.__class__ for obj in Human.objects]
-        self.assertEqual(classes, [Human])
-
-        Animal.drop_collection()
-
-    def test_inheritance(self):
-        """Ensure that document may inherit fields from a superclass document.
-        """
-        class Employee(self.Person):
-            salary = IntField()
-
-        self.assertTrue('name' in Employee._fields)
-        self.assertTrue('salary' in Employee._fields)
-        self.assertEqual(Employee._meta['collection'], 
-                         self.Person._meta['collection'])
-
-    def test_allow_inheritance(self):
-        """Ensure that inheritance may be disabled on simple classes and that
-        _cls and _types will not be used.
-        """
-        class Animal(Document):
-            meta = {'allow_inheritance': False}
-            name = StringField()
-
-        Animal.drop_collection()
-
-        def create_dog_class():
-            class Dog(Animal):
-                pass
-        self.assertRaises(ValueError, create_dog_class)
-        
-        # Check that _cls etc aren't present on simple documents
-        dog = Animal(name='dog')
-        dog.save()
-        collection = self.db[Animal._meta['collection']]
-        obj = collection.find_one()
-        self.assertFalse('_cls' in obj)
-        self.assertFalse('_types' in obj)
-
-        Animal.drop_collection()
-
-        def create_employee_class():
-            class Employee(self.Person):
-                meta = {'allow_inheritance': False}
-        self.assertRaises(ValueError, create_employee_class)
-
-    def test_collection_name(self):
-        """Ensure that a collection with a specified name may be used.
-        """
-        collection = 'personCollTest'
-        if collection in self.db.collection_names():
-            self.db.drop_collection(collection)
-
-        class Person(Document):
-            name = StringField()
-            meta = {'collection': collection}
-        
-        user = Person(name="Test User")
-        user.save()
-        self.assertTrue(collection in self.db.collection_names())
-
-        user_obj = self.db[collection].find_one()
-        self.assertEqual(user_obj['name'], "Test User")
-
-        user_obj = Person.objects[0]
-        self.assertEqual(user_obj.name, "Test User")
-
-        Person.drop_collection()
-        self.assertFalse(collection in self.db.collection_names())
-
-    def test_capped_collection(self):
-        """Ensure that capped collections work properly.
-        """
-        class Log(Document):
-            date = DateTimeField(default=datetime.datetime.now)
-            meta = {
-                'max_documents': 10,
-                'max_size': 90000,
-            }
-
-        Log.drop_collection()
-
-        # Ensure that the collection handles up to its maximum
-        for i in range(10):
-            Log().save()
-
-        self.assertEqual(len(Log.objects), 10)
-
-        # Check that extra documents don't increase the size
-        Log().save()
-        self.assertEqual(len(Log.objects), 10)
-
-        options = Log.objects._collection.options()
-        self.assertEqual(options['capped'], True)
-        self.assertEqual(options['max'], 10)
-        self.assertEqual(options['size'], 90000)
-
-        # Check that the document cannot be redefined with different options
-        def recreate_log_document():
-            class Log(Document):
-                date = DateTimeField(default=datetime.datetime.now)
-                meta = {
-                    'max_documents': 11,
-                }
-            # Create the collection by accessing Document.objects
-            Log.objects
-        self.assertRaises(InvalidCollectionError, recreate_log_document)
-
-        Log.drop_collection()
-
-    def test_indexes(self):
-        """Ensure that indexes are used when meta[indexes] is specified.
-        """
-        class BlogPost(Document):
-            date = DateTimeField(name='addDate', default=datetime.datetime.now)
-            category = StringField()
-            tags = ListField(StringField())
-            meta = {
-                'indexes': [
-                    '-date', 
-                    'tags',
-                    ('category', '-date')
-                ],
-            }
-
-        BlogPost.drop_collection()
-
-        info = BlogPost.objects._collection.index_information()
-        # _id, types, '-date', 'tags', ('cat', 'date')
-        self.assertEqual(len(info), 5) 
-
-        # Indexes are lazy so use list() to perform query
-        list(BlogPost.objects)
-        info = BlogPost.objects._collection.index_information()
-        self.assertTrue([('_types', 1), ('category', 1), ('addDate', -1)] 
-                        in info.values())
-        self.assertTrue([('_types', 1), ('addDate', -1)] in info.values())
-        # tags is a list field so it shouldn't have _types in the index
-        self.assertTrue([('tags', 1)] in info.values())
-        
-        class ExtendedBlogPost(BlogPost):
-            title = StringField()
-            meta = {'indexes': ['title']}
-
-        BlogPost.drop_collection()
-
-        list(ExtendedBlogPost.objects)
-        info = ExtendedBlogPost.objects._collection.index_information()
-        self.assertTrue([('_types', 1), ('category', 1), ('addDate', -1)] 
-                        in info.values())
-        self.assertTrue([('_types', 1), ('addDate', -1)] in info.values())
-        self.assertTrue([('_types', 1), ('title', 1)] in info.values())
-
-        BlogPost.drop_collection()
-
-    def test_unique(self):
-        """Ensure that uniqueness constraints are applied to fields.
-        """
-        class BlogPost(Document):
-            title = StringField()
-            slug = StringField(unique=True)
-
-        BlogPost.drop_collection()
-
-        post1 = BlogPost(title='test1', slug='test')
-        post1.save()
-
-        # Two posts with the same slug is not allowed
-        post2 = BlogPost(title='test2', slug='test')
-        self.assertRaises(OperationError, post2.save)
-
-        class Date(EmbeddedDocument):
-            year = IntField(name='yr')
-
-        class BlogPost(Document):
-            title = StringField()
-            date = EmbeddedDocumentField(Date)
-            slug = StringField(unique_with='date.year')
-
-        BlogPost.drop_collection()
-
-        post1 = BlogPost(title='test1', date=Date(year=2009), slug='test')
-        post1.save()
-
-        # day is different so won't raise exception
-        post2 = BlogPost(title='test2', date=Date(year=2010), slug='test')
-        post2.save()
-
-        # Now there will be two docs with the same slug and the same day: fail
-        post3 = BlogPost(title='test3', date=Date(year=2010), slug='test')
-        self.assertRaises(OperationError, post3.save)
-
-        BlogPost.drop_collection()
-
-    def test_custom_id_field(self):
-        """Ensure that documents may be created with custom primary keys.
-        """
-        class User(Document):
-            username = StringField(primary_key=True)
-            name = StringField()
-
-        User.drop_collection()
-
-        self.assertEqual(User._fields['username'].name, '_id')
-        self.assertEqual(User._meta['id_field'], 'username')
-
-        def create_invalid_user():
-            User(name='test').save() # no primary key field
-        self.assertRaises(ValidationError, create_invalid_user)
-
-        def define_invalid_user():
-            class EmailUser(User):
-                email = StringField(primary_key=True)
-        self.assertRaises(ValueError, define_invalid_user)
-        
-        user = User(username='test', name='test user')
-        user.save()
-
-        user_obj = User.objects.first()
-        self.assertEqual(user_obj.id, 'test')
-
-        user_son = User.objects._collection.find_one()
-        self.assertEqual(user_son['_id'], 'test')
-        self.assertTrue('username' not in user_son['_id'])
-        
-        User.drop_collection()
-
-    def test_creation(self):
-        """Ensure that document may be created using keyword arguments.
-        """
-        person = self.Person(name="Test User", age=30)
-        self.assertEqual(person.name, "Test User")
-        self.assertEqual(person.age, 30)
-
-    def test_reload(self):
-        """Ensure that attributes may be reloaded.
-        """
-        person = self.Person(name="Test User", age=20)
-        person.save()
-
-        person_obj = self.Person.objects.first()
-        person_obj.name = "Mr Test User"
-        person_obj.age = 21
-        person_obj.save()
-
-        self.assertEqual(person.name, "Test User")
-        self.assertEqual(person.age, 20)
-
-        person.reload()
-        self.assertEqual(person.name, "Mr Test User")
-        self.assertEqual(person.age, 21)
-
-    def test_dictionary_access(self):
-        """Ensure that dictionary-style field access works properly.
-        """
-        person = self.Person(name='Test User', age=30)
-        self.assertEquals(person['name'], 'Test User')
-
-        self.assertRaises(KeyError, person.__getitem__, 'salary')
-        self.assertRaises(KeyError, person.__setitem__, 'salary', 50)
-
-        person['name'] = 'Another User'
-        self.assertEquals(person['name'], 'Another User')
-
-        # Length = length(assigned fields + id)
-        self.assertEquals(len(person), 3)
-
-        self.assertTrue('age' in person)
-        person.age = None
-        self.assertFalse('age' in person)
-        self.assertFalse('nationality' in person)
-
-    def test_embedded_document(self):
-        """Ensure that embedded documents are set up correctly.
-        """
-        class Comment(EmbeddedDocument):
-            content = StringField()
-        
-        self.assertTrue('content' in Comment._fields)
-        self.assertFalse('id' in Comment._fields)
-        self.assertFalse(hasattr(Comment, '_meta'))
-    
-    def test_embedded_document_validation(self):
-        """Ensure that embedded documents may be validated.
-        """
-        class Comment(EmbeddedDocument):
-            date = DateTimeField()
-            content = StringField(required=True)
-        
-        comment = Comment()
-        self.assertRaises(ValidationError, comment.validate)
-
-        comment.content = 'test'
-        comment.validate()
-
-        comment.date = 4
-        self.assertRaises(ValidationError, comment.validate)
-
-        comment.date = datetime.datetime.now()
-        comment.validate()
-
-    def test_save(self):
-        """Ensure that a document may be saved in the database.
-        """
-        # Create person object and save it to the database
-        person = self.Person(name='Test User', age=30)
-        person.save()
-        # Ensure that the object is in the database
-        collection = self.db[self.Person._meta['collection']]
-        person_obj = collection.find_one({'name': 'Test User'})
-        self.assertEqual(person_obj['name'], 'Test User')
-        self.assertEqual(person_obj['age'], 30)
-        self.assertEqual(str(person_obj['_id']), person.id)
-
-    def test_delete(self):
-        """Ensure that document may be deleted using the delete method.
-        """
-        person = self.Person(name="Test User", age=30)
-        person.save()
-        self.assertEqual(len(self.Person.objects), 1)
-        person.delete()
-        self.assertEqual(len(self.Person.objects), 0)
-
-    def test_save_custom_id(self):
-        """Ensure that a document may be saved with a custom _id.
-        """
-        # Create person object and save it to the database
-        person = self.Person(name='Test User', age=30, 
-                             id='497ce96f395f2f052a494fd4')
-        person.save()
-        # Ensure that the object is in the database with the correct _id
-        collection = self.db[self.Person._meta['collection']]
-        person_obj = collection.find_one({'name': 'Test User'})
-        self.assertEqual(str(person_obj['_id']), '497ce96f395f2f052a494fd4')
-
-    def test_save_list(self):
-        """Ensure that a list field may be properly saved.
-        """
-        class Comment(EmbeddedDocument):
-            content = StringField()
-
-        class BlogPost(Document):
-            content = StringField()
-            comments = ListField(EmbeddedDocumentField(Comment))
-            tags = ListField(StringField())
-
-        BlogPost.drop_collection()
-
-        post = BlogPost(content='Went for a walk today...')
-        post.tags = tags = ['fun', 'leisure']
-        comments = [Comment(content='Good for you'), Comment(content='Yay.')]
-        post.comments = comments
-        post.save()
-
-        collection = self.db[BlogPost._meta['collection']]
-        post_obj = collection.find_one()
-        self.assertEqual(post_obj['tags'], tags)
-        for comment_obj, comment in zip(post_obj['comments'], comments):
-            self.assertEqual(comment_obj['content'], comment['content'])
-
-        BlogPost.drop_collection()
-
-    def test_save_embedded_document(self):
-        """Ensure that a document with an embedded document field may be 
-        saved in the database.
-        """
-        class EmployeeDetails(EmbeddedDocument):
-            position = StringField()
-
-        class Employee(self.Person):
-            salary = IntField()
-            details = EmbeddedDocumentField(EmployeeDetails)
-
-        # Create employee object and save it to the database
-        employee = Employee(name='Test Employee', age=50, salary=20000)
-        employee.details = EmployeeDetails(position='Developer')
-        employee.save()
-
-        # Ensure that the object is in the database
-        collection = self.db[self.Person._meta['collection']]
-        employee_obj = collection.find_one({'name': 'Test Employee'})
-        self.assertEqual(employee_obj['name'], 'Test Employee')
-        self.assertEqual(employee_obj['age'], 50)
-        # Ensure that the 'details' embedded object saved correctly
-        self.assertEqual(employee_obj['details']['position'], 'Developer')
-
-    def test_save_reference(self):
-        """Ensure that a document reference field may be saved in the database.
-        """
-        
-        class BlogPost(Document):
-            meta = {'collection': 'blogpost_1'}
-            content = StringField()
-            author = ReferenceField(self.Person)
-
-        BlogPost.drop_collection()
-
-        author = self.Person(name='Test User')
-        author.save()
-
-        post = BlogPost(content='Watched some TV today... how exciting.')
-        # Should only reference author when saving
-        post.author = author
-        post.save()
-
-        post_obj = BlogPost.objects.first()
-
-        # Test laziness
-        self.assertTrue(isinstance(post_obj._data['author'], 
-                                   pymongo.dbref.DBRef))
-        self.assertTrue(isinstance(post_obj.author, self.Person))
-        self.assertEqual(post_obj.author.name, 'Test User')
-
-        # Ensure that the dereferenced object may be changed and saved
-        post_obj.author.age = 25
-        post_obj.author.save()
-
-        author = list(self.Person.objects(name='Test User'))[-1]
-        self.assertEqual(author.age, 25)
-
-        BlogPost.drop_collection()
-
-    def tearDown(self):
-        self.Person.drop_collection()
-
-
-if __name__ == '__main__':
-    unittest.main()

tests/document/__init__.py

@@ -0,0 +1,15 @@
+import sys
+sys.path[0:0] = [""]
+import unittest
+
+from class_methods import *
+from delta import *
+from dynamic import *
+from indexes import *
+from inheritance import *
+from instance import *
+from json_serialisation import *
+from validation import *
+
+if __name__ == '__main__':
+    unittest.main()

tests/document/class_methods.py

@@ -0,0 +1,352 @@
+# -*- coding: utf-8 -*-
+import sys
+sys.path[0:0] = [""]
+import unittest
+
+from mongoengine import *
+
+from mongoengine.queryset import NULLIFY, PULL
+from mongoengine.connection import get_db
+
+__all__ = ("ClassMethodsTest", )
+
+
+class ClassMethodsTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+            non_field = True
+
+            meta = {"allow_inheritance": True}
+
+        self.Person = Person
+
+    def tearDown(self):
+        for collection in self.db.collection_names():
+            if 'system.' in collection:
+                continue
+            self.db.drop_collection(collection)
+
+    def test_definition(self):
+        """Ensure that document may be defined using fields.
+        """
+        self.assertEqual(['age', 'id', 'name'],
+                         sorted(self.Person._fields.keys()))
+        self.assertEqual(["IntField", "ObjectIdField", "StringField"],
+                        sorted([x.__class__.__name__ for x in
+                                self.Person._fields.values()]))
+
+    def test_get_db(self):
+        """Ensure that get_db returns the expected db.
+        """
+        db = self.Person._get_db()
+        self.assertEqual(self.db, db)
+
+    def test_get_collection_name(self):
+        """Ensure that get_collection_name returns the expected collection
+        name.
+        """
+        collection_name = 'person'
+        self.assertEqual(collection_name, self.Person._get_collection_name())
+
+    def test_get_collection(self):
+        """Ensure that get_collection returns the expected collection.
+        """
+        collection_name = 'person'
+        collection = self.Person._get_collection()
+        self.assertEqual(self.db[collection_name], collection)
+
+    def test_drop_collection(self):
+        """Ensure that the collection may be dropped from the database.
+        """
+        collection_name = 'person'
+        self.Person(name='Test').save()
+        self.assertTrue(collection_name in self.db.collection_names())
+
+        self.Person.drop_collection()
+        self.assertFalse(collection_name in self.db.collection_names())
+
+    def test_register_delete_rule(self):
+        """Ensure that register delete rule adds a delete rule to the document
+        meta.
+        """
+        class Job(Document):
+            employee = ReferenceField(self.Person)
+
+        self.assertEqual(self.Person._meta.get('delete_rules'), None)
+
+        self.Person.register_delete_rule(Job, 'employee', NULLIFY)
+        self.assertEqual(self.Person._meta['delete_rules'],
+                         {(Job, 'employee'): NULLIFY})
+
+    def test_compare_indexes(self):
+        """ Ensure that the indexes are properly created and that
+        compare_indexes identifies the missing/extra indexes
+        """
+
+        class BlogPost(Document):
+            author = StringField()
+            title = StringField()
+            description = StringField()
+            tags = StringField()
+
+            meta = {
+                'indexes': [('author', 'title')]
+            }
+
+        BlogPost.drop_collection()
+
+        BlogPost.ensure_indexes()
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+
+        BlogPost.ensure_index(['author', 'description'])
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [[('author', 1), ('description', 1)]] })
+
+        BlogPost._get_collection().drop_index('author_1_description_1')
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+
+        BlogPost._get_collection().drop_index('author_1_title_1')
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [[('author', 1), ('title', 1)]], 'extra': [] })
+
+    def test_compare_indexes_inheritance(self):
+        """ Ensure that the indexes are properly created and that
+        compare_indexes identifies the missing/extra indexes for subclassed
+        documents (_cls included)
+        """
+
+        class BlogPost(Document):
+            author = StringField()
+            title = StringField()
+            description = StringField()
+
+            meta = {
+                'allow_inheritance': True
+            }
+
+        class BlogPostWithTags(BlogPost):
+            tags = StringField()
+            tag_list = ListField(StringField())
+
+            meta = {
+                'indexes': [('author', 'tags')]
+            }
+
+        BlogPost.drop_collection()
+
+        BlogPost.ensure_indexes()
+        BlogPostWithTags.ensure_indexes()
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+
+        BlogPostWithTags.ensure_index(['author', 'tag_list'])
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [[('_cls', 1), ('author', 1), ('tag_list', 1)]] })
+
+        BlogPostWithTags._get_collection().drop_index('_cls_1_author_1_tag_list_1')
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+
+        BlogPostWithTags._get_collection().drop_index('_cls_1_author_1_tags_1')
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [[('_cls', 1), ('author', 1), ('tags', 1)]], 'extra': [] })
+
+    def test_compare_indexes_multiple_subclasses(self):
+        """ Ensure that compare_indexes behaves correctly if called from a
+        class, which base class has multiple subclasses
+        """
+
+        class BlogPost(Document):
+            author = StringField()
+            title = StringField()
+            description = StringField()
+
+            meta = {
+                'allow_inheritance': True
+            }
+
+        class BlogPostWithTags(BlogPost):
+            tags = StringField()
+            tag_list = ListField(StringField())
+
+            meta = {
+                'indexes': [('author', 'tags')]
+            }
+
+        class BlogPostWithCustomField(BlogPost):
+            custom = DictField()
+
+            meta = {
+                'indexes': [('author', 'custom')]
+            }
+
+        BlogPost.ensure_indexes()
+        BlogPostWithTags.ensure_indexes()
+        BlogPostWithCustomField.ensure_indexes()
+
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+        self.assertEqual(BlogPostWithTags.compare_indexes(), { 'missing': [], 'extra': [] })
+        self.assertEqual(BlogPostWithCustomField.compare_indexes(), { 'missing': [], 'extra': [] })
+
+    def test_list_indexes_inheritance(self):
+        """ ensure that all of the indexes are listed regardless of the super-
+        or sub-class that we call it from
+        """
+
+        class BlogPost(Document):
+            author = StringField()
+            title = StringField()
+            description = StringField()
+
+            meta = {
+                'allow_inheritance': True
+            }
+
+        class BlogPostWithTags(BlogPost):
+            tags = StringField()
+
+            meta = {
+                'indexes': [('author', 'tags')]
+            }
+
+        class BlogPostWithTagsAndExtraText(BlogPostWithTags):
+            extra_text = StringField()
+
+            meta = {
+                'indexes': [('author', 'tags', 'extra_text')]
+            }
+
+        BlogPost.drop_collection()
+
+        BlogPost.ensure_indexes()
+        BlogPostWithTags.ensure_indexes()
+        BlogPostWithTagsAndExtraText.ensure_indexes()
+
+        self.assertEqual(BlogPost.list_indexes(),
+                         BlogPostWithTags.list_indexes())
+        self.assertEqual(BlogPost.list_indexes(),
+                         BlogPostWithTagsAndExtraText.list_indexes())
+        self.assertEqual(BlogPost.list_indexes(),
+                         [[('_cls', 1), ('author', 1), ('tags', 1)],
+                         [('_cls', 1), ('author', 1), ('tags', 1), ('extra_text', 1)],
+                         [(u'_id', 1)], [('_cls', 1)]])
+
+    def test_register_delete_rule_inherited(self):
+
+        class Vaccine(Document):
+            name = StringField(required=True)
+
+            meta = {"indexes": ["name"]}
+
+        class Animal(Document):
+            family = StringField(required=True)
+            vaccine_made = ListField(ReferenceField("Vaccine", reverse_delete_rule=PULL))
+
+            meta = {"allow_inheritance": True, "indexes": ["family"]}
+
+        class Cat(Animal):
+            name = StringField(required=True)
+
+        self.assertEqual(Vaccine._meta['delete_rules'][(Animal, 'vaccine_made')], PULL)
+        self.assertEqual(Vaccine._meta['delete_rules'][(Cat, 'vaccine_made')], PULL)
+
+    def test_collection_naming(self):
+        """Ensure that a collection with a specified name may be used.
+        """
+
+        class DefaultNamingTest(Document):
+            pass
+        self.assertEqual('default_naming_test',
+                         DefaultNamingTest._get_collection_name())
+
+        class CustomNamingTest(Document):
+            meta = {'collection': 'pimp_my_collection'}
+
+        self.assertEqual('pimp_my_collection',
+                         CustomNamingTest._get_collection_name())
+
+        class DynamicNamingTest(Document):
+            meta = {'collection': lambda c: "DYNAMO"}
+        self.assertEqual('DYNAMO', DynamicNamingTest._get_collection_name())
+
+        # Use Abstract class to handle backwards compatibility
+        class BaseDocument(Document):
+            meta = {
+                'abstract': True,
+                'collection': lambda c: c.__name__.lower()
+            }
+
+        class OldNamingConvention(BaseDocument):
+            pass
+        self.assertEqual('oldnamingconvention',
+                         OldNamingConvention._get_collection_name())
+
+        class InheritedAbstractNamingTest(BaseDocument):
+            meta = {'collection': 'wibble'}
+        self.assertEqual('wibble',
+                         InheritedAbstractNamingTest._get_collection_name())
+
+        # Mixin tests
+        class BaseMixin(object):
+            meta = {
+                'collection': lambda c: c.__name__.lower()
+            }
+
+        class OldMixinNamingConvention(Document, BaseMixin):
+            pass
+        self.assertEqual('oldmixinnamingconvention',
+                          OldMixinNamingConvention._get_collection_name())
+
+        class BaseMixin(object):
+            meta = {
+                'collection': lambda c: c.__name__.lower()
+            }
+
+        class BaseDocument(Document, BaseMixin):
+            meta = {'allow_inheritance': True}
+
+        class MyDocument(BaseDocument):
+            pass
+
+        self.assertEqual('basedocument', MyDocument._get_collection_name())
+
+    def test_custom_collection_name_operations(self):
+        """Ensure that a collection with a specified name is used as expected.
+        """
+        collection_name = 'personCollTest'
+
+        class Person(Document):
+            name = StringField()
+            meta = {'collection': collection_name}
+
+        Person(name="Test User").save()
+        self.assertTrue(collection_name in self.db.collection_names())
+
+        user_obj = self.db[collection_name].find_one()
+        self.assertEqual(user_obj['name'], "Test User")
+
+        user_obj = Person.objects[0]
+        self.assertEqual(user_obj.name, "Test User")
+
+        Person.drop_collection()
+        self.assertFalse(collection_name in self.db.collection_names())
+
+    def test_collection_name_and_primary(self):
+        """Ensure that a collection with a specified name may be used.
+        """
+
+        class Person(Document):
+            name = StringField(primary_key=True)
+            meta = {'collection': 'app'}
+
+        Person(name="Test User").save()
+
+        user_obj = Person.objects.first()
+        self.assertEqual(user_obj.name, "Test User")
+
+        Person.drop_collection()
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/document/delta.py

@@ -0,0 +1,718 @@
+# -*- coding: utf-8 -*-
+import sys
+sys.path[0:0] = [""]
+import unittest
+
+from bson import SON
+from mongoengine import *
+from mongoengine.connection import get_db
+
+__all__ = ("DeltaTest",)
+
+
+class DeltaTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+            non_field = True
+
+            meta = {"allow_inheritance": True}
+
+        self.Person = Person
+
+    def tearDown(self):
+        for collection in self.db.collection_names():
+            if 'system.' in collection:
+                continue
+            self.db.drop_collection(collection)
+
+    def test_delta(self):
+        self.delta(Document)
+        self.delta(DynamicDocument)
+
+    def delta(self, DocClass):
+
+        class Doc(DocClass):
+            string_field = StringField()
+            int_field = IntField()
+            dict_field = DictField()
+            list_field = ListField()
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        doc.string_field = 'hello'
+        self.assertEqual(doc._get_changed_fields(), ['string_field'])
+        self.assertEqual(doc._delta(), ({'string_field': 'hello'}, {}))
+
+        doc._changed_fields = []
+        doc.int_field = 1
+        self.assertEqual(doc._get_changed_fields(), ['int_field'])
+        self.assertEqual(doc._delta(), ({'int_field': 1}, {}))
+
+        doc._changed_fields = []
+        dict_value = {'hello': 'world', 'ping': 'pong'}
+        doc.dict_field = dict_value
+        self.assertEqual(doc._get_changed_fields(), ['dict_field'])
+        self.assertEqual(doc._delta(), ({'dict_field': dict_value}, {}))
+
+        doc._changed_fields = []
+        list_value = ['1', 2, {'hello': 'world'}]
+        doc.list_field = list_value
+        self.assertEqual(doc._get_changed_fields(), ['list_field'])
+        self.assertEqual(doc._delta(), ({'list_field': list_value}, {}))
+
+        # Test unsetting
+        doc._changed_fields = []
+        doc.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(), ['dict_field'])
+        self.assertEqual(doc._delta(), ({}, {'dict_field': 1}))
+
+        doc._changed_fields = []
+        doc.list_field = []
+        self.assertEqual(doc._get_changed_fields(), ['list_field'])
+        self.assertEqual(doc._delta(), ({}, {'list_field': 1}))
+
+    def test_delta_recursive(self):
+        self.delta_recursive(Document, EmbeddedDocument)
+        self.delta_recursive(DynamicDocument, EmbeddedDocument)
+        self.delta_recursive(Document, DynamicEmbeddedDocument)
+        self.delta_recursive(DynamicDocument, DynamicEmbeddedDocument)
+
+    def delta_recursive(self, DocClass, EmbeddedClass):
+
+        class Embedded(EmbeddedClass):
+            string_field = StringField()
+            int_field = IntField()
+            dict_field = DictField()
+            list_field = ListField()
+
+        class Doc(DocClass):
+            string_field = StringField()
+            int_field = IntField()
+            dict_field = DictField()
+            list_field = ListField()
+            embedded_field = EmbeddedDocumentField(Embedded)
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        embedded_1 = Embedded()
+        embedded_1.string_field = 'hello'
+        embedded_1.int_field = 1
+        embedded_1.dict_field = {'hello': 'world'}
+        embedded_1.list_field = ['1', 2, {'hello': 'world'}]
+        doc.embedded_field = embedded_1
+
+        self.assertEqual(doc._get_changed_fields(), ['embedded_field'])
+
+        embedded_delta = {
+            'string_field': 'hello',
+            'int_field': 1,
+            'dict_field': {'hello': 'world'},
+            'list_field': ['1', 2, {'hello': 'world'}]
+        }
+        self.assertEqual(doc.embedded_field._delta(), (embedded_delta, {}))
+        self.assertEqual(doc._delta(),
+                         ({'embedded_field': embedded_delta}, {}))
+
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.embedded_field.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.dict_field'])
+        self.assertEqual(doc.embedded_field._delta(), ({}, {'dict_field': 1}))
+        self.assertEqual(doc._delta(), ({}, {'embedded_field.dict_field': 1}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.dict_field, {})
+
+        doc.embedded_field.list_field = []
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.list_field'])
+        self.assertEqual(doc.embedded_field._delta(), ({}, {'list_field': 1}))
+        self.assertEqual(doc._delta(), ({}, {'embedded_field.list_field': 1}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field, [])
+
+        embedded_2 = Embedded()
+        embedded_2.string_field = 'hello'
+        embedded_2.int_field = 1
+        embedded_2.dict_field = {'hello': 'world'}
+        embedded_2.list_field = ['1', 2, {'hello': 'world'}]
+
+        doc.embedded_field.list_field = ['1', 2, embedded_2]
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.list_field'])
+
+        self.assertEqual(doc.embedded_field._delta(), ({
+            'list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'string_field': 'hello',
+                'dict_field': {'hello': 'world'},
+                'int_field': 1,
+                'list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+
+        self.assertEqual(doc._delta(), ({
+            'embedded_field.list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'string_field': 'hello',
+                'dict_field': {'hello': 'world'},
+                'int_field': 1,
+                'list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        self.assertEqual(doc.embedded_field.list_field[0], '1')
+        self.assertEqual(doc.embedded_field.list_field[1], 2)
+        for k in doc.embedded_field.list_field[2]._fields:
+            self.assertEqual(doc.embedded_field.list_field[2][k],
+                             embedded_2[k])
+
+        doc.embedded_field.list_field[2].string_field = 'world'
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.list_field.2.string_field'])
+        self.assertEqual(doc.embedded_field._delta(),
+                         ({'list_field.2.string_field': 'world'}, {}))
+        self.assertEqual(doc._delta(),
+                         ({'embedded_field.list_field.2.string_field': 'world'}, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].string_field,
+                         'world')
+
+        # Test multiple assignments
+        doc.embedded_field.list_field[2].string_field = 'hello world'
+        doc.embedded_field.list_field[2] = doc.embedded_field.list_field[2]
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.list_field'])
+        self.assertEqual(doc.embedded_field._delta(), ({
+            'list_field': ['1', 2, {
+            '_cls': 'Embedded',
+            'string_field': 'hello world',
+            'int_field': 1,
+            'list_field': ['1', 2, {'hello': 'world'}],
+            'dict_field': {'hello': 'world'}}]}, {}))
+        self.assertEqual(doc._delta(), ({
+            'embedded_field.list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'string_field': 'hello world',
+                'int_field': 1,
+                'list_field': ['1', 2, {'hello': 'world'}],
+                'dict_field': {'hello': 'world'}}
+            ]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].string_field,
+                         'hello world')
+
+        # Test list native methods
+        doc.embedded_field.list_field[2].list_field.pop(0)
+        self.assertEqual(doc._delta(),
+                         ({'embedded_field.list_field.2.list_field':
+                          [2, {'hello': 'world'}]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.embedded_field.list_field[2].list_field.append(1)
+        self.assertEqual(doc._delta(),
+                         ({'embedded_field.list_field.2.list_field':
+                          [2, {'hello': 'world'}, 1]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].list_field,
+                         [2, {'hello': 'world'}, 1])
+
+        doc.embedded_field.list_field[2].list_field.sort(key=str)
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].list_field,
+                         [1, 2, {'hello': 'world'}])
+
+        del(doc.embedded_field.list_field[2].list_field[2]['hello'])
+        self.assertEqual(doc._delta(),
+                         ({'embedded_field.list_field.2.list_field': [1, 2, {}]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        del(doc.embedded_field.list_field[2].list_field)
+        self.assertEqual(doc._delta(),
+                         ({}, {'embedded_field.list_field.2.list_field': 1}))
+
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.dict_field['Embedded'] = embedded_1
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.dict_field['Embedded'].string_field = 'Hello World'
+        self.assertEqual(doc._get_changed_fields(),
+                         ['dict_field.Embedded.string_field'])
+        self.assertEqual(doc._delta(),
+                         ({'dict_field.Embedded.string_field': 'Hello World'}, {}))
+
+    def test_circular_reference_deltas(self):
+        self.circular_reference_deltas(Document, Document)
+        self.circular_reference_deltas(Document, DynamicDocument)
+        self.circular_reference_deltas(DynamicDocument, Document)
+        self.circular_reference_deltas(DynamicDocument, DynamicDocument)
+
+    def circular_reference_deltas(self, DocClass1, DocClass2):
+
+        class Person(DocClass1):
+            name = StringField()
+            owns = ListField(ReferenceField('Organization'))
+
+        class Organization(DocClass2):
+            name = StringField()
+            owner = ReferenceField('Person')
+
+        Person.drop_collection()
+        Organization.drop_collection()
+
+        person = Person(name="owner").save()
+        organization = Organization(name="company").save()
+
+        person.owns.append(organization)
+        organization.owner = person
+
+        person.save()
+        organization.save()
+
+        p = Person.objects[0].select_related()
+        o = Organization.objects.first()
+        self.assertEqual(p.owns[0], o)
+        self.assertEqual(o.owner, p)
+
+    def test_circular_reference_deltas_2(self):
+        self.circular_reference_deltas_2(Document, Document)
+        self.circular_reference_deltas_2(Document, DynamicDocument)
+        self.circular_reference_deltas_2(DynamicDocument, Document)
+        self.circular_reference_deltas_2(DynamicDocument, DynamicDocument)
+
+    def circular_reference_deltas_2(self, DocClass1, DocClass2, dbref=True):
+
+        class Person(DocClass1):
+            name = StringField()
+            owns = ListField(ReferenceField('Organization', dbref=dbref))
+            employer = ReferenceField('Organization', dbref=dbref)
+
+        class Organization(DocClass2):
+            name = StringField()
+            owner = ReferenceField('Person', dbref=dbref)
+            employees = ListField(ReferenceField('Person', dbref=dbref))
+
+        Person.drop_collection()
+        Organization.drop_collection()
+
+        person = Person(name="owner").save()
+        employee = Person(name="employee").save()
+        organization = Organization(name="company").save()
+
+        person.owns.append(organization)
+        organization.owner = person
+
+        organization.employees.append(employee)
+        employee.employer = organization
+
+        person.save()
+        organization.save()
+        employee.save()
+
+        p = Person.objects.get(name="owner")
+        e = Person.objects.get(name="employee")
+        o = Organization.objects.first()
+
+        self.assertEqual(p.owns[0], o)
+        self.assertEqual(o.owner, p)
+        self.assertEqual(e.employer, o)
+
+        return person, organization, employee
+
+    def test_delta_db_field(self):
+        self.delta_db_field(Document)
+        self.delta_db_field(DynamicDocument)
+
+    def delta_db_field(self, DocClass):
+
+        class Doc(DocClass):
+            string_field = StringField(db_field='db_string_field')
+            int_field = IntField(db_field='db_int_field')
+            dict_field = DictField(db_field='db_dict_field')
+            list_field = ListField(db_field='db_list_field')
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        doc.string_field = 'hello'
+        self.assertEqual(doc._get_changed_fields(), ['db_string_field'])
+        self.assertEqual(doc._delta(), ({'db_string_field': 'hello'}, {}))
+
+        doc._changed_fields = []
+        doc.int_field = 1
+        self.assertEqual(doc._get_changed_fields(), ['db_int_field'])
+        self.assertEqual(doc._delta(), ({'db_int_field': 1}, {}))
+
+        doc._changed_fields = []
+        dict_value = {'hello': 'world', 'ping': 'pong'}
+        doc.dict_field = dict_value
+        self.assertEqual(doc._get_changed_fields(), ['db_dict_field'])
+        self.assertEqual(doc._delta(), ({'db_dict_field': dict_value}, {}))
+
+        doc._changed_fields = []
+        list_value = ['1', 2, {'hello': 'world'}]
+        doc.list_field = list_value
+        self.assertEqual(doc._get_changed_fields(), ['db_list_field'])
+        self.assertEqual(doc._delta(), ({'db_list_field': list_value}, {}))
+
+        # Test unsetting
+        doc._changed_fields = []
+        doc.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(), ['db_dict_field'])
+        self.assertEqual(doc._delta(), ({}, {'db_dict_field': 1}))
+
+        doc._changed_fields = []
+        doc.list_field = []
+        self.assertEqual(doc._get_changed_fields(), ['db_list_field'])
+        self.assertEqual(doc._delta(), ({}, {'db_list_field': 1}))
+
+        # Test it saves that data
+        doc = Doc()
+        doc.save()
+
+        doc.string_field = 'hello'
+        doc.int_field = 1
+        doc.dict_field = {'hello': 'world'}
+        doc.list_field = ['1', 2, {'hello': 'world'}]
+        doc.save()
+        doc = doc.reload(10)
+
+        self.assertEqual(doc.string_field, 'hello')
+        self.assertEqual(doc.int_field, 1)
+        self.assertEqual(doc.dict_field, {'hello': 'world'})
+        self.assertEqual(doc.list_field, ['1', 2, {'hello': 'world'}])
+
+    def test_delta_recursive_db_field(self):
+        self.delta_recursive_db_field(Document, EmbeddedDocument)
+        self.delta_recursive_db_field(Document, DynamicEmbeddedDocument)
+        self.delta_recursive_db_field(DynamicDocument, EmbeddedDocument)
+        self.delta_recursive_db_field(DynamicDocument, DynamicEmbeddedDocument)
+
+    def delta_recursive_db_field(self, DocClass, EmbeddedClass):
+
+        class Embedded(EmbeddedClass):
+            string_field = StringField(db_field='db_string_field')
+            int_field = IntField(db_field='db_int_field')
+            dict_field = DictField(db_field='db_dict_field')
+            list_field = ListField(db_field='db_list_field')
+
+        class Doc(DocClass):
+            string_field = StringField(db_field='db_string_field')
+            int_field = IntField(db_field='db_int_field')
+            dict_field = DictField(db_field='db_dict_field')
+            list_field = ListField(db_field='db_list_field')
+            embedded_field = EmbeddedDocumentField(Embedded,
+                                    db_field='db_embedded_field')
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        embedded_1 = Embedded()
+        embedded_1.string_field = 'hello'
+        embedded_1.int_field = 1
+        embedded_1.dict_field = {'hello': 'world'}
+        embedded_1.list_field = ['1', 2, {'hello': 'world'}]
+        doc.embedded_field = embedded_1
+
+        self.assertEqual(doc._get_changed_fields(), ['db_embedded_field'])
+
+        embedded_delta = {
+            'db_string_field': 'hello',
+            'db_int_field': 1,
+            'db_dict_field': {'hello': 'world'},
+            'db_list_field': ['1', 2, {'hello': 'world'}]
+        }
+        self.assertEqual(doc.embedded_field._delta(), (embedded_delta, {}))
+        self.assertEqual(doc._delta(),
+            ({'db_embedded_field': embedded_delta}, {}))
+
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.embedded_field.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_dict_field'])
+        self.assertEqual(doc.embedded_field._delta(),
+            ({}, {'db_dict_field': 1}))
+        self.assertEqual(doc._delta(),
+            ({}, {'db_embedded_field.db_dict_field': 1}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.dict_field, {})
+
+        doc.embedded_field.list_field = []
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_list_field'])
+        self.assertEqual(doc.embedded_field._delta(),
+            ({}, {'db_list_field': 1}))
+        self.assertEqual(doc._delta(),
+            ({}, {'db_embedded_field.db_list_field': 1}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field, [])
+
+        embedded_2 = Embedded()
+        embedded_2.string_field = 'hello'
+        embedded_2.int_field = 1
+        embedded_2.dict_field = {'hello': 'world'}
+        embedded_2.list_field = ['1', 2, {'hello': 'world'}]
+
+        doc.embedded_field.list_field = ['1', 2, embedded_2]
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_list_field'])
+        self.assertEqual(doc.embedded_field._delta(), ({
+            'db_list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'db_string_field': 'hello',
+                'db_dict_field': {'hello': 'world'},
+                'db_int_field': 1,
+                'db_list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+
+        self.assertEqual(doc._delta(), ({
+            'db_embedded_field.db_list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'db_string_field': 'hello',
+                'db_dict_field': {'hello': 'world'},
+                'db_int_field': 1,
+                'db_list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        self.assertEqual(doc.embedded_field.list_field[0], '1')
+        self.assertEqual(doc.embedded_field.list_field[1], 2)
+        for k in doc.embedded_field.list_field[2]._fields:
+            self.assertEqual(doc.embedded_field.list_field[2][k],
+                             embedded_2[k])
+
+        doc.embedded_field.list_field[2].string_field = 'world'
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_list_field.2.db_string_field'])
+        self.assertEqual(doc.embedded_field._delta(),
+            ({'db_list_field.2.db_string_field': 'world'}, {}))
+        self.assertEqual(doc._delta(),
+            ({'db_embedded_field.db_list_field.2.db_string_field': 'world'},
+             {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].string_field,
+                        'world')
+
+        # Test multiple assignments
+        doc.embedded_field.list_field[2].string_field = 'hello world'
+        doc.embedded_field.list_field[2] = doc.embedded_field.list_field[2]
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_list_field'])
+        self.assertEqual(doc.embedded_field._delta(), ({
+            'db_list_field': ['1', 2, {
+            '_cls': 'Embedded',
+            'db_string_field': 'hello world',
+            'db_int_field': 1,
+            'db_list_field': ['1', 2, {'hello': 'world'}],
+            'db_dict_field': {'hello': 'world'}}]}, {}))
+        self.assertEqual(doc._delta(), ({
+            'db_embedded_field.db_list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'db_string_field': 'hello world',
+                'db_int_field': 1,
+                'db_list_field': ['1', 2, {'hello': 'world'}],
+                'db_dict_field': {'hello': 'world'}}
+            ]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].string_field,
+                        'hello world')
+
+        # Test list native methods
+        doc.embedded_field.list_field[2].list_field.pop(0)
+        self.assertEqual(doc._delta(),
+            ({'db_embedded_field.db_list_field.2.db_list_field':
+                [2, {'hello': 'world'}]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.embedded_field.list_field[2].list_field.append(1)
+        self.assertEqual(doc._delta(),
+            ({'db_embedded_field.db_list_field.2.db_list_field':
+                [2, {'hello': 'world'}, 1]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].list_field,
+            [2, {'hello': 'world'}, 1])
+
+        doc.embedded_field.list_field[2].list_field.sort(key=str)
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].list_field,
+            [1, 2, {'hello': 'world'}])
+
+        del(doc.embedded_field.list_field[2].list_field[2]['hello'])
+        self.assertEqual(doc._delta(),
+            ({'db_embedded_field.db_list_field.2.db_list_field':
+                [1, 2, {}]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        del(doc.embedded_field.list_field[2].list_field)
+        self.assertEqual(doc._delta(), ({},
+            {'db_embedded_field.db_list_field.2.db_list_field': 1}))
+
+    def test_delta_for_dynamic_documents(self):
+        class Person(DynamicDocument):
+            name = StringField()
+            meta = {'allow_inheritance': True}
+
+        Person.drop_collection()
+
+        p = Person(name="James", age=34)
+        self.assertEqual(p._delta(), (
+            SON([('_cls', 'Person'), ('name', 'James'), ('age', 34)]), {}))
+
+        p.doc = 123
+        del(p.doc)
+        self.assertEqual(p._delta(), (
+            SON([('_cls', 'Person'), ('name', 'James'), ('age', 34)]), {}))
+
+        p = Person()
+        p.name = "Dean"
+        p.age = 22
+        p.save()
+
+        p.age = 24
+        self.assertEqual(p.age, 24)
+        self.assertEqual(p._get_changed_fields(), ['age'])
+        self.assertEqual(p._delta(), ({'age': 24}, {}))
+
+        p = Person.objects(age=22).get()
+        p.age = 24
+        self.assertEqual(p.age, 24)
+        self.assertEqual(p._get_changed_fields(), ['age'])
+        self.assertEqual(p._delta(), ({'age': 24}, {}))
+
+        p.save()
+        self.assertEqual(1, Person.objects(age=24).count())
+
+    def test_dynamic_delta(self):
+
+        class Doc(DynamicDocument):
+            pass
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        doc.string_field = 'hello'
+        self.assertEqual(doc._get_changed_fields(), ['string_field'])
+        self.assertEqual(doc._delta(), ({'string_field': 'hello'}, {}))
+
+        doc._changed_fields = []
+        doc.int_field = 1
+        self.assertEqual(doc._get_changed_fields(), ['int_field'])
+        self.assertEqual(doc._delta(), ({'int_field': 1}, {}))
+
+        doc._changed_fields = []
+        dict_value = {'hello': 'world', 'ping': 'pong'}
+        doc.dict_field = dict_value
+        self.assertEqual(doc._get_changed_fields(), ['dict_field'])
+        self.assertEqual(doc._delta(), ({'dict_field': dict_value}, {}))
+
+        doc._changed_fields = []
+        list_value = ['1', 2, {'hello': 'world'}]
+        doc.list_field = list_value
+        self.assertEqual(doc._get_changed_fields(), ['list_field'])
+        self.assertEqual(doc._delta(), ({'list_field': list_value}, {}))
+
+        # Test unsetting
+        doc._changed_fields = []
+        doc.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(), ['dict_field'])
+        self.assertEqual(doc._delta(), ({}, {'dict_field': 1}))
+
+        doc._changed_fields = []
+        doc.list_field = []
+        self.assertEqual(doc._get_changed_fields(), ['list_field'])
+        self.assertEqual(doc._delta(), ({}, {'list_field': 1}))
+
+    def test_delta_with_dbref_true(self):
+        person, organization, employee = self.circular_reference_deltas_2(Document, Document, True)
+        employee.name = 'test'
+
+        self.assertEqual(organization._get_changed_fields(), [])
+
+        updates, removals = organization._delta()
+        self.assertEqual({}, removals)
+        self.assertEqual({}, updates)
+
+        organization.employees.append(person)
+        updates, removals = organization._delta()
+        self.assertEqual({}, removals)
+        self.assertTrue('employees' in updates)
+
+    def test_delta_with_dbref_false(self):
+        person, organization, employee = self.circular_reference_deltas_2(Document, Document, False)
+        employee.name = 'test'
+
+        self.assertEqual(organization._get_changed_fields(), [])
+
+        updates, removals = organization._delta()
+        self.assertEqual({}, removals)
+        self.assertEqual({}, updates)
+
+        organization.employees.append(person)
+        updates, removals = organization._delta()
+        self.assertEqual({}, removals)
+        self.assertTrue('employees' in updates)
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/document/dynamic.py

@@ -0,0 +1,297 @@
+import unittest
+import sys
+sys.path[0:0] = [""]
+
+from mongoengine import *
+from mongoengine.connection import get_db
+
+__all__ = ("DynamicTest", )
+
+
+class DynamicTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+        class Person(DynamicDocument):
+            name = StringField()
+            meta = {'allow_inheritance': True}
+
+        Person.drop_collection()
+
+        self.Person = Person
+
+    def test_simple_dynamic_document(self):
+        """Ensures simple dynamic documents are saved correctly"""
+
+        p = self.Person()
+        p.name = "James"
+        p.age = 34
+
+        self.assertEqual(p.to_mongo(), {"_cls": "Person", "name": "James",
+                                        "age": 34})
+        self.assertEqual(p.to_mongo().keys(), ["_cls", "name", "age"])
+        p.save()
+        self.assertEqual(p.to_mongo().keys(), ["_id", "_cls", "name", "age"])
+
+        self.assertEqual(self.Person.objects.first().age, 34)
+
+        # Confirm no changes to self.Person
+        self.assertFalse(hasattr(self.Person, 'age'))
+
+    def test_change_scope_of_variable(self):
+        """Test changing the scope of a dynamic field has no adverse effects"""
+        p = self.Person()
+        p.name = "Dean"
+        p.misc = 22
+        p.save()
+
+        p = self.Person.objects.get()
+        p.misc = {'hello': 'world'}
+        p.save()
+
+        p = self.Person.objects.get()
+        self.assertEqual(p.misc, {'hello': 'world'})
+
+    def test_delete_dynamic_field(self):
+        """Test deleting a dynamic field works"""
+        self.Person.drop_collection()
+        p = self.Person()
+        p.name = "Dean"
+        p.misc = 22
+        p.save()
+
+        p = self.Person.objects.get()
+        p.misc = {'hello': 'world'}
+        p.save()
+
+        p = self.Person.objects.get()
+        self.assertEqual(p.misc, {'hello': 'world'})
+        collection = self.db[self.Person._get_collection_name()]
+        obj = collection.find_one()
+        self.assertEqual(sorted(obj.keys()), ['_cls', '_id', 'misc', 'name'])
+
+        del(p.misc)
+        p.save()
+
+        p = self.Person.objects.get()
+        self.assertFalse(hasattr(p, 'misc'))
+
+        obj = collection.find_one()
+        self.assertEqual(sorted(obj.keys()), ['_cls', '_id', 'name'])
+
+    def test_dynamic_document_queries(self):
+        """Ensure we can query dynamic fields"""
+        p = self.Person()
+        p.name = "Dean"
+        p.age = 22
+        p.save()
+
+        self.assertEqual(1, self.Person.objects(age=22).count())
+        p = self.Person.objects(age=22)
+        p = p.get()
+        self.assertEqual(22, p.age)
+
+    def test_complex_dynamic_document_queries(self):
+        class Person(DynamicDocument):
+            name = StringField()
+
+        Person.drop_collection()
+
+        p = Person(name="test")
+        p.age = "ten"
+        p.save()
+
+        p1 = Person(name="test1")
+        p1.age = "less then ten and a half"
+        p1.save()
+
+        p2 = Person(name="test2")
+        p2.age = 10
+        p2.save()
+
+        self.assertEqual(Person.objects(age__icontains='ten').count(), 2)
+        self.assertEqual(Person.objects(age__gte=10).count(), 1)
+
+    def test_complex_data_lookups(self):
+        """Ensure you can query dynamic document dynamic fields"""
+        p = self.Person()
+        p.misc = {'hello': 'world'}
+        p.save()
+
+        self.assertEqual(1, self.Person.objects(misc__hello='world').count())
+
+    def test_complex_embedded_document_validation(self):
+        """Ensure embedded dynamic documents may be validated"""
+        class Embedded(DynamicEmbeddedDocument):
+            content = URLField()
+
+        class Doc(DynamicDocument):
+            pass
+
+        Doc.drop_collection()
+        doc = Doc()
+
+        embedded_doc_1 = Embedded(content='http://mongoengine.org')
+        embedded_doc_1.validate()
+
+        embedded_doc_2 = Embedded(content='this is not a url')
+        self.assertRaises(ValidationError, embedded_doc_2.validate)
+
+        doc.embedded_field_1 = embedded_doc_1
+        doc.embedded_field_2 = embedded_doc_2
+        self.assertRaises(ValidationError, doc.validate)
+
+    def test_inheritance(self):
+        """Ensure that dynamic document plays nice with inheritance"""
+        class Employee(self.Person):
+            salary = IntField()
+
+        Employee.drop_collection()
+
+        self.assertTrue('name' in Employee._fields)
+        self.assertTrue('salary' in Employee._fields)
+        self.assertEqual(Employee._get_collection_name(),
+                         self.Person._get_collection_name())
+
+        joe_bloggs = Employee()
+        joe_bloggs.name = "Joe Bloggs"
+        joe_bloggs.salary = 10
+        joe_bloggs.age = 20
+        joe_bloggs.save()
+
+        self.assertEqual(1, self.Person.objects(age=20).count())
+        self.assertEqual(1, Employee.objects(age=20).count())
+
+        joe_bloggs = self.Person.objects.first()
+        self.assertTrue(isinstance(joe_bloggs, Employee))
+
+    def test_embedded_dynamic_document(self):
+        """Test dynamic embedded documents"""
+        class Embedded(DynamicEmbeddedDocument):
+            pass
+
+        class Doc(DynamicDocument):
+            pass
+
+        Doc.drop_collection()
+        doc = Doc()
+
+        embedded_1 = Embedded()
+        embedded_1.string_field = 'hello'
+        embedded_1.int_field = 1
+        embedded_1.dict_field = {'hello': 'world'}
+        embedded_1.list_field = ['1', 2, {'hello': 'world'}]
+        doc.embedded_field = embedded_1
+
+        self.assertEqual(doc.to_mongo(), {
+            "embedded_field": {
+                "_cls": "Embedded",
+                "string_field": "hello",
+                "int_field": 1,
+                "dict_field": {"hello": "world"},
+                "list_field": ['1', 2, {'hello': 'world'}]
+            }
+        })
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc.embedded_field.__class__, Embedded)
+        self.assertEqual(doc.embedded_field.string_field, "hello")
+        self.assertEqual(doc.embedded_field.int_field, 1)
+        self.assertEqual(doc.embedded_field.dict_field, {'hello': 'world'})
+        self.assertEqual(doc.embedded_field.list_field,
+                            ['1', 2, {'hello': 'world'}])
+
+    def test_complex_embedded_documents(self):
+        """Test complex dynamic embedded documents setups"""
+        class Embedded(DynamicEmbeddedDocument):
+            pass
+
+        class Doc(DynamicDocument):
+            pass
+
+        Doc.drop_collection()
+        doc = Doc()
+
+        embedded_1 = Embedded()
+        embedded_1.string_field = 'hello'
+        embedded_1.int_field = 1
+        embedded_1.dict_field = {'hello': 'world'}
+
+        embedded_2 = Embedded()
+        embedded_2.string_field = 'hello'
+        embedded_2.int_field = 1
+        embedded_2.dict_field = {'hello': 'world'}
+        embedded_2.list_field = ['1', 2, {'hello': 'world'}]
+
+        embedded_1.list_field = ['1', 2, embedded_2]
+        doc.embedded_field = embedded_1
+
+        self.assertEqual(doc.to_mongo(), {
+            "embedded_field": {
+                "_cls": "Embedded",
+                "string_field": "hello",
+                "int_field": 1,
+                "dict_field": {"hello": "world"},
+                "list_field": ['1', 2,
+                    {"_cls": "Embedded",
+                    "string_field": "hello",
+                    "int_field": 1,
+                    "dict_field": {"hello": "world"},
+                    "list_field": ['1', 2, {'hello': 'world'}]}
+                ]
+            }
+        })
+        doc.save()
+        doc = Doc.objects.first()
+        self.assertEqual(doc.embedded_field.__class__, Embedded)
+        self.assertEqual(doc.embedded_field.string_field, "hello")
+        self.assertEqual(doc.embedded_field.int_field, 1)
+        self.assertEqual(doc.embedded_field.dict_field, {'hello': 'world'})
+        self.assertEqual(doc.embedded_field.list_field[0], '1')
+        self.assertEqual(doc.embedded_field.list_field[1], 2)
+
+        embedded_field = doc.embedded_field.list_field[2]
+
+        self.assertEqual(embedded_field.__class__, Embedded)
+        self.assertEqual(embedded_field.string_field, "hello")
+        self.assertEqual(embedded_field.int_field, 1)
+        self.assertEqual(embedded_field.dict_field, {'hello': 'world'})
+        self.assertEqual(embedded_field.list_field, ['1', 2,
+                                                        {'hello': 'world'}])
+
+    def test_dynamic_and_embedded(self):
+        """Ensure embedded documents play nicely"""
+
+        class Address(EmbeddedDocument):
+            city = StringField()
+
+        class Person(DynamicDocument):
+            name = StringField()
+
+        Person.drop_collection()
+
+        Person(name="Ross", address=Address(city="London")).save()
+
+        person = Person.objects.first()
+        person.address.city = "Lundenne"
+        person.save()
+
+        self.assertEqual(Person.objects.first().address.city, "Lundenne")
+
+        person = Person.objects.first()
+        person.address = Address(city="Londinium")
+        person.save()
+
+        self.assertEqual(Person.objects.first().address.city, "Londinium")
+
+        person = Person.objects.first()
+        person.age = 35
+        person.save()
+        self.assertEqual(Person.objects.first().age, 35)
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/document/indexes.py

@@ -0,0 +1,731 @@
+# -*- coding: utf-8 -*-
+import unittest
+import sys
+sys.path[0:0] = [""]
+
+import os
+import pymongo
+
+from nose.plugins.skip import SkipTest
+from datetime import datetime
+
+from mongoengine import *
+from mongoengine.connection import get_db, get_connection
+
+__all__ = ("IndexesTest", )
+
+
+class IndexesTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+            non_field = True
+
+            meta = {"allow_inheritance": True}
+
+        self.Person = Person
+
+    def tearDown(self):
+        for collection in self.db.collection_names():
+            if 'system.' in collection:
+                continue
+            self.db.drop_collection(collection)
+
+    def test_indexes_document(self):
+        """Ensure that indexes are used when meta[indexes] is specified for
+        Documents
+        """
+        self._index_test(Document)
+
+    def test_indexes_dynamic_document(self):
+        """Ensure that indexes are used when meta[indexes] is specified for
+        Dynamic Documents
+        """
+        self._index_test(DynamicDocument)
+
+    def _index_test(self, InheritFrom):
+
+        class BlogPost(InheritFrom):
+            date = DateTimeField(db_field='addDate', default=datetime.now)
+            category = StringField()
+            tags = ListField(StringField())
+            meta = {
+                'indexes': [
+                    '-date',
+                    'tags',
+                    ('category', '-date')
+                ]
+            }
+
+        expected_specs = [{'fields': [('addDate', -1)]},
+                          {'fields': [('tags', 1)]},
+                          {'fields': [('category', 1), ('addDate', -1)]}]
+        self.assertEqual(expected_specs, BlogPost._meta['index_specs'])
+
+        BlogPost.ensure_indexes()
+        info = BlogPost.objects._collection.index_information()
+        # _id, '-date', 'tags', ('cat', 'date')
+        self.assertEqual(len(info), 4)
+        info = [value['key'] for key, value in info.iteritems()]
+        for expected in expected_specs:
+            self.assertTrue(expected['fields'] in info)
+
+    def _index_test_inheritance(self, InheritFrom):
+
+        class BlogPost(InheritFrom):
+            date = DateTimeField(db_field='addDate', default=datetime.now)
+            category = StringField()
+            tags = ListField(StringField())
+            meta = {
+                'indexes': [
+                    '-date',
+                    'tags',
+                    ('category', '-date')
+                ],
+                'allow_inheritance': True
+            }
+
+        expected_specs = [{'fields': [('_cls', 1), ('addDate', -1)]},
+                          {'fields': [('_cls', 1), ('tags', 1)]},
+                          {'fields': [('_cls', 1), ('category', 1),
+                                      ('addDate', -1)]}]
+        self.assertEqual(expected_specs, BlogPost._meta['index_specs'])
+
+        BlogPost.ensure_indexes()
+        info = BlogPost.objects._collection.index_information()
+        # _id, '-date', 'tags', ('cat', 'date')
+        # NB: there is no index on _cls by itself, since
+        # the indices on -date and tags will both contain
+        # _cls as first element in the key
+        self.assertEqual(len(info), 4)
+        info = [value['key'] for key, value in info.iteritems()]
+        for expected in expected_specs:
+            self.assertTrue(expected['fields'] in info)
+
+        class ExtendedBlogPost(BlogPost):
+            title = StringField()
+            meta = {'indexes': ['title']}
+
+        expected_specs.append({'fields': [('_cls', 1), ('title', 1)]})
+        self.assertEqual(expected_specs, ExtendedBlogPost._meta['index_specs'])
+
+        BlogPost.drop_collection()
+
+        ExtendedBlogPost.ensure_indexes()
+        info = ExtendedBlogPost.objects._collection.index_information()
+        info = [value['key'] for key, value in info.iteritems()]
+        for expected in expected_specs:
+            self.assertTrue(expected['fields'] in info)
+
+    def test_indexes_document_inheritance(self):
+        """Ensure that indexes are used when meta[indexes] is specified for
+        Documents
+        """
+        self._index_test_inheritance(Document)
+
+    def test_indexes_dynamic_document_inheritance(self):
+        """Ensure that indexes are used when meta[indexes] is specified for
+        Dynamic Documents
+        """
+        self._index_test_inheritance(DynamicDocument)
+
+    def test_inherited_index(self):
+        """Ensure index specs are inhertited correctly"""
+
+        class A(Document):
+            title = StringField()
+            meta = {
+                'indexes': [
+                        {
+                        'fields': ('title',),
+                        },
+                ],
+                'allow_inheritance': True,
+                }
+
+        class B(A):
+            description = StringField()
+
+        self.assertEqual(A._meta['index_specs'], B._meta['index_specs'])
+        self.assertEqual([{'fields': [('_cls', 1), ('title', 1)]}],
+                         A._meta['index_specs'])
+
+    def test_index_no_cls(self):
+        """Ensure index specs are inhertited correctly"""
+
+        class A(Document):
+            title = StringField()
+            meta = {
+                'indexes': [
+                        {'fields': ('title',), 'cls': False},
+                ],
+                'allow_inheritance': True,
+                'index_cls': False
+                }
+
+        self.assertEqual([('title', 1)], A._meta['index_specs'][0]['fields'])
+        A._get_collection().drop_indexes()
+        A.ensure_indexes()
+        info = A._get_collection().index_information()
+        self.assertEqual(len(info.keys()), 2)
+
+    def test_build_index_spec_is_not_destructive(self):
+
+        class MyDoc(Document):
+            keywords = StringField()
+
+            meta = {
+                'indexes': ['keywords'],
+                'allow_inheritance': False
+            }
+
+        self.assertEqual(MyDoc._meta['index_specs'],
+                         [{'fields': [('keywords', 1)]}])
+
+        # Force index creation
+        MyDoc.ensure_indexes()
+
+        self.assertEqual(MyDoc._meta['index_specs'],
+                        [{'fields': [('keywords', 1)]}])
+
+    def test_embedded_document_index_meta(self):
+        """Ensure that embedded document indexes are created explicitly
+        """
+        class Rank(EmbeddedDocument):
+            title = StringField(required=True)
+
+        class Person(Document):
+            name = StringField(required=True)
+            rank = EmbeddedDocumentField(Rank, required=False)
+
+            meta = {
+                'indexes': [
+                    'rank.title',
+                ],
+                'allow_inheritance': False
+            }
+
+        self.assertEqual([{'fields': [('rank.title', 1)]}],
+                        Person._meta['index_specs'])
+
+        Person.drop_collection()
+
+        # Indexes are lazy so use list() to perform query
+        list(Person.objects)
+        info = Person.objects._collection.index_information()
+        info = [value['key'] for key, value in info.iteritems()]
+        self.assertTrue([('rank.title', 1)] in info)
+
+    def test_explicit_geo2d_index(self):
+        """Ensure that geo2d indexes work when created via meta[indexes]
+        """
+        class Place(Document):
+            location = DictField()
+            meta = {
+                'allow_inheritance': True,
+                'indexes': [
+                    '*location.point',
+                ]
+            }
+
+        self.assertEqual([{'fields': [('location.point', '2d')]}],
+                         Place._meta['index_specs'])
+
+        Place.ensure_indexes()
+        info = Place._get_collection().index_information()
+        info = [value['key'] for key, value in info.iteritems()]
+        self.assertTrue([('location.point', '2d')] in info)
+
+    def test_explicit_geo2d_index_embedded(self):
+        """Ensure that geo2d indexes work when created via meta[indexes]
+        """
+        class EmbeddedLocation(EmbeddedDocument):
+            location = DictField()
+
+        class Place(Document):
+            current = DictField(field=EmbeddedDocumentField('EmbeddedLocation'))
+            meta = {
+                'allow_inheritance': True,
+                'indexes': [
+                    '*current.location.point',
+                ]
+            }
+
+        self.assertEqual([{'fields': [('current.location.point', '2d')]}],
+                         Place._meta['index_specs'])
+
+        Place.ensure_indexes()
+        info = Place._get_collection().index_information()
+        info = [value['key'] for key, value in info.iteritems()]
+        self.assertTrue([('current.location.point', '2d')] in info)
+
+    def test_dictionary_indexes(self):
+        """Ensure that indexes are used when meta[indexes] contains
+        dictionaries instead of lists.
+        """
+        class BlogPost(Document):
+            date = DateTimeField(db_field='addDate', default=datetime.now)
+            category = StringField()
+            tags = ListField(StringField())
+            meta = {
+                'indexes': [
+                    {'fields': ['-date'], 'unique': True, 'sparse': True},
+                ],
+            }
+
+        self.assertEqual([{'fields': [('addDate', -1)], 'unique': True,
+                          'sparse': True}],
+                         BlogPost._meta['index_specs'])
+
+        BlogPost.drop_collection()
+
+        info = BlogPost.objects._collection.index_information()
+        # _id, '-date'
+        self.assertEqual(len(info), 2)
+
+        # Indexes are lazy so use list() to perform query
+        list(BlogPost.objects)
+        info = BlogPost.objects._collection.index_information()
+        info = [(value['key'],
+                 value.get('unique', False),
+                 value.get('sparse', False))
+                for key, value in info.iteritems()]
+        self.assertTrue(([('addDate', -1)], True, True) in info)
+
+        BlogPost.drop_collection()
+
+    def test_abstract_index_inheritance(self):
+
+        class UserBase(Document):
+            user_guid = StringField(required=True)
+            meta = {
+                'abstract': True,
+                'indexes': ['user_guid'],
+                'allow_inheritance': True
+            }
+
+        class Person(UserBase):
+            name = StringField()
+
+            meta = {
+                'indexes': ['name'],
+            }
+        Person.drop_collection()
+
+        Person(name="test", user_guid='123').save()
+
+        self.assertEqual(1, Person.objects.count())
+        info = Person.objects._collection.index_information()
+        self.assertEqual(sorted(info.keys()),
+                         ['_cls_1_name_1', '_cls_1_user_guid_1', '_id_'])
+
+    def test_disable_index_creation(self):
+        """Tests setting auto_create_index to False on the connection will
+        disable any index generation.
+        """
+        class User(Document):
+            meta = {
+                'allow_inheritance': True,
+                'indexes': ['user_guid'],
+                'auto_create_index': False
+            }
+            user_guid = StringField(required=True)
+
+        class MongoUser(User):
+            pass
+
+        User.drop_collection()
+
+        User(user_guid='123').save()
+        MongoUser(user_guid='123').save()
+
+        self.assertEqual(2, User.objects.count())
+        info = User.objects._collection.index_information()
+        self.assertEqual(info.keys(), ['_id_'])
+
+        User.ensure_indexes()
+        info = User.objects._collection.index_information()
+        self.assertEqual(sorted(info.keys()), ['_cls_1_user_guid_1', '_id_'])
+        User.drop_collection()
+
+    def test_embedded_document_index(self):
+        """Tests settings an index on an embedded document
+        """
+        class Date(EmbeddedDocument):
+            year = IntField(db_field='yr')
+
+        class BlogPost(Document):
+            title = StringField()
+            date = EmbeddedDocumentField(Date)
+
+            meta = {
+                'indexes': [
+                    '-date.year'
+                ],
+            }
+
+        BlogPost.drop_collection()
+
+        info = BlogPost.objects._collection.index_information()
+        self.assertEqual(sorted(info.keys()), ['_id_', 'date.yr_-1'])
+        BlogPost.drop_collection()
+
+    def test_list_embedded_document_index(self):
+        """Ensure list embedded documents can be indexed
+        """
+        class Tag(EmbeddedDocument):
+            name = StringField(db_field='tag')
+
+        class BlogPost(Document):
+            title = StringField()
+            tags = ListField(EmbeddedDocumentField(Tag))
+
+            meta = {
+                'indexes': [
+                    'tags.name'
+                ]
+            }
+
+        BlogPost.drop_collection()
+
+        info = BlogPost.objects._collection.index_information()
+        # we don't use _cls in with list fields by default
+        self.assertEqual(sorted(info.keys()), ['_id_', 'tags.tag_1'])
+
+        post1 = BlogPost(title="Embedded Indexes tests in place",
+                         tags=[Tag(name="about"), Tag(name="time")])
+        post1.save()
+        BlogPost.drop_collection()
+
+    def test_recursive_embedded_objects_dont_break_indexes(self):
+
+        class RecursiveObject(EmbeddedDocument):
+            obj = EmbeddedDocumentField('self')
+
+        class RecursiveDocument(Document):
+            recursive_obj = EmbeddedDocumentField(RecursiveObject)
+            meta = {'allow_inheritance': True}
+
+        RecursiveDocument.ensure_indexes()
+        info = RecursiveDocument._get_collection().index_information()
+        self.assertEqual(sorted(info.keys()), ['_cls_1', '_id_'])
+
+    def test_covered_index(self):
+        """Ensure that covered indexes can be used
+        """
+
+        class Test(Document):
+            a = IntField()
+
+            meta = {
+                'indexes': ['a'],
+                'allow_inheritance': False
+            }
+
+        Test.drop_collection()
+
+        obj = Test(a=1)
+        obj.save()
+
+        # Need to be explicit about covered indexes as mongoDB doesn't know if
+        # the documents returned might have more keys in that here.
+        query_plan = Test.objects(id=obj.id).exclude('a').explain()
+        self.assertFalse(query_plan['indexOnly'])
+
+        query_plan = Test.objects(id=obj.id).only('id').explain()
+        self.assertTrue(query_plan['indexOnly'])
+
+        query_plan = Test.objects(a=1).only('a').exclude('id').explain()
+        self.assertTrue(query_plan['indexOnly'])
+
+    def test_index_on_id(self):
+
+        class BlogPost(Document):
+            meta = {
+                'indexes': [
+                    ['categories', 'id']
+                ]
+            }
+
+            title = StringField(required=True)
+            description = StringField(required=True)
+            categories = ListField()
+
+        BlogPost.drop_collection()
+
+        indexes = BlogPost.objects._collection.index_information()
+        self.assertEqual(indexes['categories_1__id_1']['key'],
+                                 [('categories', 1), ('_id', 1)])
+
+    def test_hint(self):
+
+        class BlogPost(Document):
+            tags = ListField(StringField())
+            meta = {
+                'indexes': [
+                    'tags',
+                ],
+            }
+
+        BlogPost.drop_collection()
+
+        for i in xrange(0, 10):
+            tags = [("tag %i" % n) for n in xrange(0, i % 2)]
+            BlogPost(tags=tags).save()
+
+        self.assertEqual(BlogPost.objects.count(), 10)
+        self.assertEqual(BlogPost.objects.hint().count(), 10)
+        self.assertEqual(BlogPost.objects.hint([('tags', 1)]).count(), 10)
+
+        self.assertEqual(BlogPost.objects.hint([('ZZ', 1)]).count(), 10)
+
+        def invalid_index():
+            BlogPost.objects.hint('tags')
+        self.assertRaises(TypeError, invalid_index)
+
+        def invalid_index_2():
+            return BlogPost.objects.hint(('tags', 1))
+        self.assertRaises(TypeError, invalid_index_2)
+
+    def test_unique(self):
+        """Ensure that uniqueness constraints are applied to fields.
+        """
+        class BlogPost(Document):
+            title = StringField()
+            slug = StringField(unique=True)
+
+        BlogPost.drop_collection()
+
+        post1 = BlogPost(title='test1', slug='test')
+        post1.save()
+
+        # Two posts with the same slug is not allowed
+        post2 = BlogPost(title='test2', slug='test')
+        self.assertRaises(NotUniqueError, post2.save)
+
+        # Ensure backwards compatibilty for errors
+        self.assertRaises(OperationError, post2.save)
+
+    def test_unique_with(self):
+        """Ensure that unique_with constraints are applied to fields.
+        """
+        class Date(EmbeddedDocument):
+            year = IntField(db_field='yr')
+
+        class BlogPost(Document):
+            title = StringField()
+            date = EmbeddedDocumentField(Date)
+            slug = StringField(unique_with='date.year')
+
+        BlogPost.drop_collection()
+
+        post1 = BlogPost(title='test1', date=Date(year=2009), slug='test')
+        post1.save()
+
+        # day is different so won't raise exception
+        post2 = BlogPost(title='test2', date=Date(year=2010), slug='test')
+        post2.save()
+
+        # Now there will be two docs with the same slug and the same day: fail
+        post3 = BlogPost(title='test3', date=Date(year=2010), slug='test')
+        self.assertRaises(OperationError, post3.save)
+
+        BlogPost.drop_collection()
+
+    def test_unique_embedded_document(self):
+        """Ensure that uniqueness constraints are applied to fields on embedded documents.
+        """
+        class SubDocument(EmbeddedDocument):
+            year = IntField(db_field='yr')
+            slug = StringField(unique=True)
+
+        class BlogPost(Document):
+            title = StringField()
+            sub = EmbeddedDocumentField(SubDocument)
+
+        BlogPost.drop_collection()
+
+        post1 = BlogPost(title='test1',
+                         sub=SubDocument(year=2009, slug="test"))
+        post1.save()
+
+        # sub.slug is different so won't raise exception
+        post2 = BlogPost(title='test2',
+                         sub=SubDocument(year=2010, slug='another-slug'))
+        post2.save()
+
+        # Now there will be two docs with the same sub.slug
+        post3 = BlogPost(title='test3',
+                         sub=SubDocument(year=2010, slug='test'))
+        self.assertRaises(NotUniqueError, post3.save)
+
+        BlogPost.drop_collection()
+
+    def test_unique_with_embedded_document_and_embedded_unique(self):
+        """Ensure that uniqueness constraints are applied to fields on
+        embedded documents.  And work with unique_with as well.
+        """
+        class SubDocument(EmbeddedDocument):
+            year = IntField(db_field='yr')
+            slug = StringField(unique=True)
+
+        class BlogPost(Document):
+            title = StringField(unique_with='sub.year')
+            sub = EmbeddedDocumentField(SubDocument)
+
+        BlogPost.drop_collection()
+
+        post1 = BlogPost(title='test1',
+                         sub=SubDocument(year=2009, slug="test"))
+        post1.save()
+
+        # sub.slug is different so won't raise exception
+        post2 = BlogPost(title='test2',
+                         sub=SubDocument(year=2010, slug='another-slug'))
+        post2.save()
+
+        # Now there will be two docs with the same sub.slug
+        post3 = BlogPost(title='test3',
+                         sub=SubDocument(year=2010, slug='test'))
+        self.assertRaises(NotUniqueError, post3.save)
+
+        # Now there will be two docs with the same title and year
+        post3 = BlogPost(title='test1',
+                         sub=SubDocument(year=2009, slug='test-1'))
+        self.assertRaises(NotUniqueError, post3.save)
+
+        BlogPost.drop_collection()
+
+    def test_ttl_indexes(self):
+
+        class Log(Document):
+            created = DateTimeField(default=datetime.now)
+            meta = {
+                'indexes': [
+                    {'fields': ['created'], 'expireAfterSeconds': 3600}
+                ]
+            }
+
+        Log.drop_collection()
+
+        if pymongo.version_tuple[0] < 2 and pymongo.version_tuple[1] < 3:
+            raise SkipTest('pymongo needs to be 2.3 or higher for this test')
+
+        connection = get_connection()
+        version_array = connection.server_info()['versionArray']
+        if version_array[0] < 2 and version_array[1] < 2:
+            raise SkipTest('MongoDB needs to be 2.2 or higher for this test')
+
+        # Indexes are lazy so use list() to perform query
+        list(Log.objects)
+        info = Log.objects._collection.index_information()
+        self.assertEqual(3600,
+                         info['created_1']['expireAfterSeconds'])
+
+    def test_unique_and_indexes(self):
+        """Ensure that 'unique' constraints aren't overridden by
+        meta.indexes.
+        """
+        class Customer(Document):
+            cust_id = IntField(unique=True, required=True)
+            meta = {
+                'indexes': ['cust_id'],
+                'allow_inheritance': False,
+            }
+
+        Customer.drop_collection()
+        cust = Customer(cust_id=1)
+        cust.save()
+
+        cust_dupe = Customer(cust_id=1)
+        try:
+            cust_dupe.save()
+            raise AssertionError("We saved a dupe!")
+        except NotUniqueError:
+            pass
+        Customer.drop_collection()
+
+    def test_unique_and_primary(self):
+        """If you set a field as primary, then unexpected behaviour can occur.
+        You won't create a duplicate but you will update an existing document.
+        """
+
+        class User(Document):
+            name = StringField(primary_key=True, unique=True)
+            password = StringField()
+
+        User.drop_collection()
+
+        user = User(name='huangz', password='secret')
+        user.save()
+
+        user = User(name='huangz', password='secret2')
+        user.save()
+
+        self.assertEqual(User.objects.count(), 1)
+        self.assertEqual(User.objects.get().password, 'secret2')
+
+        User.drop_collection()
+
+    def test_index_with_pk(self):
+        """Ensure you can use `pk` as part of a query"""
+
+        class Comment(EmbeddedDocument):
+            comment_id = IntField(required=True)
+
+        try:
+            class BlogPost(Document):
+                comments = EmbeddedDocumentField(Comment)
+                meta = {'indexes': [
+                            {'fields': ['pk', 'comments.comment_id'],
+                             'unique': True}]}
+        except UnboundLocalError:
+            self.fail('Unbound local error at index + pk definition')
+
+        info = BlogPost.objects._collection.index_information()
+        info = [value['key'] for key, value in info.iteritems()]
+        index_item = [('_id', 1), ('comments.comment_id', 1)]
+        self.assertTrue(index_item in info)
+
+    def test_compound_key_embedded(self):
+
+        class CompoundKey(EmbeddedDocument):
+            name = StringField(required=True)
+            term = StringField(required=True)
+
+        class Report(Document):
+            key = EmbeddedDocumentField(CompoundKey, primary_key=True)
+            text = StringField()
+
+        Report.drop_collection()
+
+        my_key = CompoundKey(name="n", term="ok")
+        report = Report(text="OK", key=my_key).save()
+
+        self.assertEqual({'text': 'OK', '_id': {'term': 'ok', 'name': 'n'}},
+                         report.to_mongo())
+        self.assertEqual(report, Report.objects.get(pk=my_key))
+
+    def test_compound_key_dictfield(self):
+
+        class Report(Document):
+            key = DictField(primary_key=True)
+            text = StringField()
+
+        Report.drop_collection()
+
+        my_key = {"name": "n", "term": "ok"}
+        report = Report(text="OK", key=my_key).save()
+
+        self.assertEqual({'text': 'OK', '_id': {'term': 'ok', 'name': 'n'}},
+                         report.to_mongo())
+        self.assertEqual(report, Report.objects.get(pk=my_key))
+
+if __name__ == '__main__':
+    unittest.main()

tests/document/inheritance.py

@@ -0,0 +1,449 @@
+# -*- coding: utf-8 -*-
+import sys
+sys.path[0:0] = [""]
+import unittest
+import warnings
+
+from datetime import datetime
+
+from tests.fixtures import Base
+
+from mongoengine import Document, EmbeddedDocument, connect
+from mongoengine.connection import get_db
+from mongoengine.fields import (BooleanField, GenericReferenceField,
+                                IntField, StringField)
+
+__all__ = ('InheritanceTest', )
+
+
+class InheritanceTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+    def tearDown(self):
+        for collection in self.db.collection_names():
+            if 'system.' in collection:
+                continue
+            self.db.drop_collection(collection)
+
+    def test_superclasses(self):
+        """Ensure that the correct list of superclasses is assembled.
+        """
+        class Animal(Document):
+            meta = {'allow_inheritance': True}
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        self.assertEqual(Animal._superclasses, ())
+        self.assertEqual(Fish._superclasses, ('Animal',))
+        self.assertEqual(Guppy._superclasses, ('Animal', 'Animal.Fish'))
+        self.assertEqual(Mammal._superclasses, ('Animal',))
+        self.assertEqual(Dog._superclasses, ('Animal', 'Animal.Mammal'))
+        self.assertEqual(Human._superclasses, ('Animal', 'Animal.Mammal'))
+
+    def test_external_superclasses(self):
+        """Ensure that the correct list of super classes is assembled when
+        importing part of the model.
+        """
+        class Animal(Base): pass
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        self.assertEqual(Animal._superclasses, ('Base', ))
+        self.assertEqual(Fish._superclasses, ('Base', 'Base.Animal',))
+        self.assertEqual(Guppy._superclasses, ('Base', 'Base.Animal',
+                                               'Base.Animal.Fish'))
+        self.assertEqual(Mammal._superclasses, ('Base', 'Base.Animal',))
+        self.assertEqual(Dog._superclasses, ('Base', 'Base.Animal',
+                                             'Base.Animal.Mammal'))
+        self.assertEqual(Human._superclasses, ('Base', 'Base.Animal',
+                                               'Base.Animal.Mammal'))
+
+    def test_subclasses(self):
+        """Ensure that the correct list of _subclasses (subclasses) is
+        assembled.
+        """
+        class Animal(Document):
+            meta = {'allow_inheritance': True}
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        self.assertEqual(Animal._subclasses, ('Animal',
+                                         'Animal.Fish',
+                                         'Animal.Fish.Guppy',
+                                         'Animal.Mammal',
+                                         'Animal.Mammal.Dog',
+                                         'Animal.Mammal.Human'))
+        self.assertEqual(Fish._subclasses, ('Animal.Fish',
+                                       'Animal.Fish.Guppy',))
+        self.assertEqual(Guppy._subclasses, ('Animal.Fish.Guppy',))
+        self.assertEqual(Mammal._subclasses, ('Animal.Mammal',
+                                         'Animal.Mammal.Dog',
+                                         'Animal.Mammal.Human'))
+        self.assertEqual(Human._subclasses, ('Animal.Mammal.Human',))
+
+    def test_external_subclasses(self):
+        """Ensure that the correct list of _subclasses (subclasses) is
+        assembled when importing part of the model.
+        """
+        class Animal(Base): pass
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        self.assertEqual(Animal._subclasses, ('Base.Animal',
+                                              'Base.Animal.Fish',
+                                              'Base.Animal.Fish.Guppy',
+                                              'Base.Animal.Mammal',
+                                              'Base.Animal.Mammal.Dog',
+                                              'Base.Animal.Mammal.Human'))
+        self.assertEqual(Fish._subclasses, ('Base.Animal.Fish',
+                                            'Base.Animal.Fish.Guppy',))
+        self.assertEqual(Guppy._subclasses, ('Base.Animal.Fish.Guppy',))
+        self.assertEqual(Mammal._subclasses, ('Base.Animal.Mammal',
+                                              'Base.Animal.Mammal.Dog',
+                                              'Base.Animal.Mammal.Human'))
+        self.assertEqual(Human._subclasses, ('Base.Animal.Mammal.Human',))
+
+    def test_dynamic_declarations(self):
+        """Test that declaring an extra class updates meta data"""
+
+        class Animal(Document):
+            meta = {'allow_inheritance': True}
+
+        self.assertEqual(Animal._superclasses, ())
+        self.assertEqual(Animal._subclasses, ('Animal',))
+
+        # Test dynamically adding a class changes the meta data
+        class Fish(Animal):
+            pass
+
+        self.assertEqual(Animal._superclasses, ())
+        self.assertEqual(Animal._subclasses, ('Animal', 'Animal.Fish'))
+
+        self.assertEqual(Fish._superclasses, ('Animal', ))
+        self.assertEqual(Fish._subclasses, ('Animal.Fish',))
+
+        # Test dynamically adding an inherited class changes the meta data
+        class Pike(Fish):
+            pass
+
+        self.assertEqual(Animal._superclasses, ())
+        self.assertEqual(Animal._subclasses, ('Animal', 'Animal.Fish',
+                                              'Animal.Fish.Pike'))
+
+        self.assertEqual(Fish._superclasses, ('Animal', ))
+        self.assertEqual(Fish._subclasses, ('Animal.Fish', 'Animal.Fish.Pike'))
+
+        self.assertEqual(Pike._superclasses, ('Animal', 'Animal.Fish'))
+        self.assertEqual(Pike._subclasses, ('Animal.Fish.Pike',))
+
+    def test_inheritance_meta_data(self):
+        """Ensure that document may inherit fields from a superclass document.
+        """
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+            meta = {'allow_inheritance': True}
+
+        class Employee(Person):
+            salary = IntField()
+
+        self.assertEqual(['age', 'id', 'name', 'salary'],
+                         sorted(Employee._fields.keys()))
+        self.assertEqual(Employee._get_collection_name(),
+                         Person._get_collection_name())
+
+    def test_inheritance_to_mongo_keys(self):
+        """Ensure that document may inherit fields from a superclass document.
+        """
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+            meta = {'allow_inheritance': True}
+
+        class Employee(Person):
+            salary = IntField()
+
+        self.assertEqual(['age', 'id', 'name', 'salary'],
+                         sorted(Employee._fields.keys()))
+        self.assertEqual(Person(name="Bob", age=35).to_mongo().keys(),
+                         ['_cls', 'name', 'age'])
+        self.assertEqual(Employee(name="Bob", age=35, salary=0).to_mongo().keys(),
+                         ['_cls', 'name', 'age', 'salary'])
+        self.assertEqual(Employee._get_collection_name(),
+                         Person._get_collection_name())
+
+    def test_indexes_and_multiple_inheritance(self):
+        """ Ensure that all of the indexes are created for a document with
+        multiple inheritance.
+        """
+
+        class A(Document):
+            a = StringField()
+
+            meta = {
+                'allow_inheritance': True,
+                'indexes': ['a']
+            }
+
+        class B(Document):
+            b = StringField()
+
+            meta = {
+                'allow_inheritance': True,
+                'indexes': ['b']
+            }
+
+        class C(A, B):
+            pass
+
+        A.drop_collection()
+        B.drop_collection()
+        C.drop_collection()
+
+        C.ensure_indexes()
+
+        self.assertEqual(
+            sorted([idx['key'] for idx in C._get_collection().index_information().values()]),
+            sorted([[(u'_cls', 1), (u'b', 1)], [(u'_id', 1)], [(u'_cls', 1), (u'a', 1)]])
+        )
+
+    def test_polymorphic_queries(self):
+        """Ensure that the correct subclasses are returned from a query
+        """
+
+        class Animal(Document):
+            meta = {'allow_inheritance': True}
+        class Fish(Animal): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        Animal.drop_collection()
+
+        Animal().save()
+        Fish().save()
+        Mammal().save()
+        Dog().save()
+        Human().save()
+
+        classes = [obj.__class__ for obj in Animal.objects]
+        self.assertEqual(classes, [Animal, Fish, Mammal, Dog, Human])
+
+        classes = [obj.__class__ for obj in Mammal.objects]
+        self.assertEqual(classes, [Mammal, Dog, Human])
+
+        classes = [obj.__class__ for obj in Human.objects]
+        self.assertEqual(classes, [Human])
+
+    def test_allow_inheritance(self):
+        """Ensure that inheritance may be disabled on simple classes and that
+        _cls and _subclasses will not be used.
+        """
+
+        class Animal(Document):
+            name = StringField()
+
+        def create_dog_class():
+            class Dog(Animal):
+                pass
+
+        self.assertRaises(ValueError, create_dog_class)
+
+        # Check that _cls etc aren't present on simple documents
+        dog = Animal(name='dog').save()
+        self.assertEqual(dog.to_mongo().keys(), ['_id', 'name'])
+
+        collection = self.db[Animal._get_collection_name()]
+        obj = collection.find_one()
+        self.assertFalse('_cls' in obj)
+
+    def test_cant_turn_off_inheritance_on_subclass(self):
+        """Ensure if inheritance is on in a subclass you cant turn it off
+        """
+
+        class Animal(Document):
+            name = StringField()
+            meta = {'allow_inheritance': True}
+
+        def create_mammal_class():
+            class Mammal(Animal):
+                meta = {'allow_inheritance': False}
+        self.assertRaises(ValueError, create_mammal_class)
+
+    def test_allow_inheritance_abstract_document(self):
+        """Ensure that abstract documents can set inheritance rules and that
+        _cls will not be used.
+        """
+        class FinalDocument(Document):
+            meta = {'abstract': True,
+                    'allow_inheritance': False}
+
+        class Animal(FinalDocument):
+            name = StringField()
+
+        def create_mammal_class():
+            class Mammal(Animal):
+                pass
+        self.assertRaises(ValueError, create_mammal_class)
+
+        # Check that _cls isn't present in simple documents
+        doc = Animal(name='dog')
+        self.assertFalse('_cls' in doc.to_mongo())
+
+    def test_allow_inheritance_embedded_document(self):
+        """Ensure embedded documents respect inheritance
+        """
+
+        class Comment(EmbeddedDocument):
+            content = StringField()
+
+        def create_special_comment():
+            class SpecialComment(Comment):
+                pass
+
+        self.assertRaises(ValueError, create_special_comment)
+
+        doc = Comment(content='test')
+        self.assertFalse('_cls' in doc.to_mongo())
+
+        class Comment(EmbeddedDocument):
+            content = StringField()
+            meta = {'allow_inheritance': True}
+
+        doc = Comment(content='test')
+        self.assertTrue('_cls' in doc.to_mongo())
+
+    def test_document_inheritance(self):
+        """Ensure mutliple inheritance of abstract documents
+        """
+        class DateCreatedDocument(Document):
+            meta = {
+                'allow_inheritance': True,
+                'abstract': True,
+            }
+
+        class DateUpdatedDocument(Document):
+            meta = {
+                'allow_inheritance': True,
+                'abstract': True,
+            }
+
+        try:
+            class MyDocument(DateCreatedDocument, DateUpdatedDocument):
+                pass
+        except:
+            self.assertTrue(False, "Couldn't create MyDocument class")
+
+    def test_abstract_documents(self):
+        """Ensure that a document superclass can be marked as abstract
+        thereby not using it as the name for the collection."""
+
+        defaults = {'index_background': True,
+                    'index_drop_dups': True,
+                    'index_opts': {'hello': 'world'},
+                    'allow_inheritance': True,
+                    'queryset_class': 'QuerySet',
+                    'db_alias': 'myDB',
+                    'shard_key': ('hello', 'world')}
+
+        meta_settings = {'abstract': True}
+        meta_settings.update(defaults)
+
+        class Animal(Document):
+            name = StringField()
+            meta = meta_settings
+
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+
+        class Mammal(Animal):
+            meta = {'abstract': True}
+        class Human(Mammal): pass
+
+        for k, v in defaults.iteritems():
+            for cls in [Animal, Fish, Guppy]:
+                self.assertEqual(cls._meta[k], v)
+
+        self.assertFalse('collection' in Animal._meta)
+        self.assertFalse('collection' in Mammal._meta)
+
+        self.assertEqual(Animal._get_collection_name(), None)
+        self.assertEqual(Mammal._get_collection_name(), None)
+
+        self.assertEqual(Fish._get_collection_name(), 'fish')
+        self.assertEqual(Guppy._get_collection_name(), 'fish')
+        self.assertEqual(Human._get_collection_name(), 'human')
+
+        def create_bad_abstract():
+            class EvilHuman(Human):
+                evil = BooleanField(default=True)
+                meta = {'abstract': True}
+        self.assertRaises(ValueError, create_bad_abstract)
+
+    def test_inherited_collections(self):
+        """Ensure that subclassed documents don't override parents'
+        collections
+        """
+
+        class Drink(Document):
+            name = StringField()
+            meta = {'allow_inheritance': True}
+
+        class Drinker(Document):
+            drink = GenericReferenceField()
+
+        try:
+            warnings.simplefilter("error")
+
+            class AcloholicDrink(Drink):
+                meta = {'collection': 'booze'}
+
+        except SyntaxWarning:
+            warnings.simplefilter("ignore")
+
+            class AlcoholicDrink(Drink):
+                meta = {'collection': 'booze'}
+
+        else:
+            raise AssertionError("SyntaxWarning should be triggered")
+
+        warnings.resetwarnings()
+
+        Drink.drop_collection()
+        AlcoholicDrink.drop_collection()
+        Drinker.drop_collection()
+
+        red_bull = Drink(name='Red Bull')
+        red_bull.save()
+
+        programmer = Drinker(drink=red_bull)
+        programmer.save()
+
+        beer = AlcoholicDrink(name='Beer')
+        beer.save()
+        real_person = Drinker(drink=beer)
+        real_person.save()
+
+        self.assertEqual(Drinker.objects[0].drink.name, red_bull.name)
+        self.assertEqual(Drinker.objects[1].drink.name, beer.name)
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/document/json_serialisation.py

@@ -0,0 +1,85 @@
+import sys
+sys.path[0:0] = [""]
+
+import unittest
+import uuid
+
+from nose.plugins.skip import SkipTest
+from datetime import datetime
+from bson import ObjectId
+
+import pymongo
+
+from mongoengine import *
+
+__all__ = ("TestJson",)
+
+
+class TestJson(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+
+    def test_json_simple(self):
+
+        class Embedded(EmbeddedDocument):
+            string = StringField()
+
+        class Doc(Document):
+            string = StringField()
+            embedded_field = EmbeddedDocumentField(Embedded)
+
+        doc = Doc(string="Hi", embedded_field=Embedded(string="Hi"))
+
+        doc_json = doc.to_json(sort_keys=True, separators=(',', ':'))
+        expected_json = """{"embedded_field":{"string":"Hi"},"string":"Hi"}"""
+        self.assertEqual(doc_json, expected_json)
+
+        self.assertEqual(doc, Doc.from_json(doc.to_json()))
+
+    def test_json_complex(self):
+
+        if pymongo.version_tuple[0] <= 2 and pymongo.version_tuple[1] <= 3:
+            raise SkipTest("Need pymongo 2.4 as has a fix for DBRefs")
+
+        class EmbeddedDoc(EmbeddedDocument):
+            pass
+
+        class Simple(Document):
+            pass
+
+        class Doc(Document):
+            string_field = StringField(default='1')
+            int_field = IntField(default=1)
+            float_field = FloatField(default=1.1)
+            boolean_field = BooleanField(default=True)
+            datetime_field = DateTimeField(default=datetime.now)
+            embedded_document_field = EmbeddedDocumentField(EmbeddedDoc,
+                                        default=lambda: EmbeddedDoc())
+            list_field = ListField(default=lambda: [1, 2, 3])
+            dict_field = DictField(default=lambda: {"hello": "world"})
+            objectid_field = ObjectIdField(default=ObjectId)
+            reference_field = ReferenceField(Simple, default=lambda:
+                                                        Simple().save())
+            map_field = MapField(IntField(), default=lambda: {"simple": 1})
+            decimal_field = DecimalField(default=1.0)
+            complex_datetime_field = ComplexDateTimeField(default=datetime.now)
+            url_field = URLField(default="http://mongoengine.org")
+            dynamic_field = DynamicField(default=1)
+            generic_reference_field = GenericReferenceField(
+                                            default=lambda: Simple().save())
+            sorted_list_field = SortedListField(IntField(),
+                                                default=lambda: [1, 2, 3])
+            email_field = EmailField(default="ross@example.com")
+            geo_point_field = GeoPointField(default=lambda: [1, 2])
+            sequence_field = SequenceField()
+            uuid_field = UUIDField(default=uuid.uuid4)
+            generic_embedded_document_field = GenericEmbeddedDocumentField(
+                                        default=lambda: EmbeddedDoc())
+
+        doc = Doc()
+        self.assertEqual(doc, Doc.from_json(doc.to_json()))
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/document/validation.py

@@ -0,0 +1,146 @@
+# -*- coding: utf-8 -*-
+import sys
+sys.path[0:0] = [""]
+
+import unittest
+from datetime import datetime
+
+from mongoengine import *
+
+__all__ = ("ValidatorErrorTest",)
+
+
+class ValidatorErrorTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+
+    def test_to_dict(self):
+        """Ensure a ValidationError handles error to_dict correctly.
+        """
+        error = ValidationError('root')
+        self.assertEqual(error.to_dict(), {})
+
+        # 1st level error schema
+        error.errors = {'1st': ValidationError('bad 1st'), }
+        self.assertTrue('1st' in error.to_dict())
+        self.assertEqual(error.to_dict()['1st'], 'bad 1st')
+
+        # 2nd level error schema
+        error.errors = {'1st': ValidationError('bad 1st', errors={
+            '2nd': ValidationError('bad 2nd'),
+        })}
+        self.assertTrue('1st' in error.to_dict())
+        self.assertTrue(isinstance(error.to_dict()['1st'], dict))
+        self.assertTrue('2nd' in error.to_dict()['1st'])
+        self.assertEqual(error.to_dict()['1st']['2nd'], 'bad 2nd')
+
+        # moar levels
+        error.errors = {'1st': ValidationError('bad 1st', errors={
+            '2nd': ValidationError('bad 2nd', errors={
+                '3rd': ValidationError('bad 3rd', errors={
+                    '4th': ValidationError('Inception'),
+                }),
+            }),
+        })}
+        self.assertTrue('1st' in error.to_dict())
+        self.assertTrue('2nd' in error.to_dict()['1st'])
+        self.assertTrue('3rd' in error.to_dict()['1st']['2nd'])
+        self.assertTrue('4th' in error.to_dict()['1st']['2nd']['3rd'])
+        self.assertEqual(error.to_dict()['1st']['2nd']['3rd']['4th'],
+                         'Inception')
+
+        self.assertEqual(error.message, "root(2nd.3rd.4th.Inception: ['1st'])")
+
+    def test_model_validation(self):
+
+        class User(Document):
+            username = StringField(primary_key=True)
+            name = StringField(required=True)
+
+        try:
+            User().validate()
+        except ValidationError, e:
+            self.assertTrue("User:None" in e.message)
+            self.assertEqual(e.to_dict(), {
+                'username': 'Field is required',
+                'name': 'Field is required'})
+
+        user = User(username="RossC0", name="Ross").save()
+        user.name = None
+        try:
+            user.save()
+        except ValidationError, e:
+            self.assertTrue("User:RossC0" in e.message)
+            self.assertEqual(e.to_dict(), {
+                'name': 'Field is required'})
+
+    def test_fields_rewrite(self):
+        class BasePerson(Document):
+            name = StringField()
+            age = IntField()
+            meta = {'abstract': True}
+
+        class Person(BasePerson):
+            name = StringField(required=True)
+
+        p = Person(age=15)
+        self.assertRaises(ValidationError, p.validate)
+
+    def test_embedded_document_validation(self):
+        """Ensure that embedded documents may be validated.
+        """
+        class Comment(EmbeddedDocument):
+            date = DateTimeField()
+            content = StringField(required=True)
+
+        comment = Comment()
+        self.assertRaises(ValidationError, comment.validate)
+
+        comment.content = 'test'
+        comment.validate()
+
+        comment.date = 4
+        self.assertRaises(ValidationError, comment.validate)
+
+        comment.date = datetime.now()
+        comment.validate()
+        self.assertEqual(comment._instance, None)
+
+    def test_embedded_db_field_validate(self):
+
+        class SubDoc(EmbeddedDocument):
+            val = IntField(required=True)
+
+        class Doc(Document):
+            id = StringField(primary_key=True)
+            e = EmbeddedDocumentField(SubDoc, db_field='eb')
+
+        try:
+            Doc(id="bad").validate()
+        except ValidationError, e:
+            self.assertTrue("SubDoc:None" in e.message)
+            self.assertEqual(e.to_dict(), {
+                "e": {'val': 'OK could not be converted to int'}})
+
+        Doc.drop_collection()
+
+        Doc(id="test", e=SubDoc(val=15)).save()
+
+        doc = Doc.objects.first()
+        keys = doc._data.keys()
+        self.assertEqual(2, len(keys))
+        self.assertTrue('e' in keys)
+        self.assertTrue('id' in keys)
+
+        doc.e.val = "OK"
+        try:
+            doc.save()
+        except ValidationError, e:
+            self.assertTrue("Doc:test" in e.message)
+            self.assertEqual(e.to_dict(), {
+                "e": {'val': 'OK could not be converted to int'}})
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/fields.py

@@ -1,264 +0,0 @@
-import unittest
-import datetime
-
-from mongoengine import *
-from mongoengine.connection import _get_db
-
-
-class FieldTest(unittest.TestCase):
-
-    def setUp(self):
-        connect(db='mongoenginetest')
-        self.db = _get_db()
-
-    def test_default_values(self):
-        """Ensure that default field values are used when creating a document.
-        """
-        class Person(Document):
-            name = StringField()
-            age = IntField(default=30)
-            userid = StringField(default=lambda: 'test')
-
-        person = Person(name='Test Person')
-        self.assertEqual(person._data['age'], 30)
-        self.assertEqual(person._data['userid'], 'test')
-
-    def test_required_values(self):
-        """Ensure that required field constraints are enforced.
-        """
-        class Person(Document):
-            name = StringField(required=True)
-            age = IntField(required=True)
-            userid = StringField()
-
-        person = Person(name="Test User")
-        self.assertRaises(ValidationError, person.validate)
-        person = Person(age=30)
-        self.assertRaises(ValidationError, person.validate)
-
-    def test_object_id_validation(self):
-        """Ensure that invalid values cannot be assigned to string fields.
-        """
-        class Person(Document):
-            name = StringField()
-        
-        person = Person(name='Test User')
-        self.assertEqual(person.id, None)
-
-        person.id = 47
-        self.assertRaises(ValidationError, person.validate)
-
-        person.id = 'abc'
-        self.assertRaises(ValidationError, person.validate)
-
-        person.id = '497ce96f395f2f052a494fd4'
-        person.validate()
-
-    def test_string_validation(self):
-        """Ensure that invalid values cannot be assigned to string fields.
-        """
-        class Person(Document):
-            name = StringField(max_length=20)
-            userid = StringField(r'[0-9a-z_]+$')
-
-        person = Person(name=34)
-        self.assertRaises(ValidationError, person.validate)
-
-        # Test regex validation on userid
-        person = Person(userid='test.User')
-        self.assertRaises(ValidationError, person.validate)
-
-        person.userid = 'test_user'
-        self.assertEqual(person.userid, 'test_user')
-        person.validate()
-
-        # Test max length validation on name
-        person = Person(name='Name that is more than twenty characters')
-        self.assertRaises(ValidationError, person.validate)
-
-        person.name = 'Shorter name'
-        person.validate()
-
-    def test_int_validation(self):
-        """Ensure that invalid values cannot be assigned to int fields.
-        """
-        class Person(Document):
-            age = IntField(min_value=0, max_value=110)
-
-        person = Person()
-        person.age = 50
-        person.validate()
-
-        person.age = -1
-        self.assertRaises(ValidationError, person.validate)
-        person.age = 120
-        self.assertRaises(ValidationError, person.validate)
-        person.age = 'ten'
-        self.assertRaises(ValidationError, person.validate)
-
-    def test_float_validation(self):
-        """Ensure that invalid values cannot be assigned to float fields.
-        """
-        class Person(Document):
-            height = FloatField(min_value=0.1, max_value=3.5)
-
-        person = Person()
-        person.height = 1.89
-        person.validate()
-
-        person.height = 2
-        self.assertRaises(ValidationError, person.validate)
-        person.height = 0.01
-        self.assertRaises(ValidationError, person.validate)
-        person.height = 4.0
-        self.assertRaises(ValidationError, person.validate)
-
-    def test_boolean_validation(self):
-        """Ensure that invalid values cannot be assigned to boolean fields.
-        """
-        class Person(Document):
-            admin = BooleanField()
-
-        person = Person()
-        person.admin = True
-        person.validate()
-
-        person.admin = 2
-        self.assertRaises(ValidationError, person.validate)
-        person.admin = 'Yes'
-        self.assertRaises(ValidationError, person.validate)
-
-    def test_datetime_validation(self):
-        """Ensure that invalid values cannot be assigned to datetime fields.
-        """
-        class LogEntry(Document):
-            time = DateTimeField()
-
-        log = LogEntry()
-        log.time = datetime.datetime.now()
-        log.validate()
-
-        log.time = -1
-        self.assertRaises(ValidationError, log.validate)
-        log.time = '1pm'
-        self.assertRaises(ValidationError, log.validate)
-
-    def test_list_validation(self):
-        """Ensure that a list field only accepts lists with valid elements.
-        """
-        class Comment(EmbeddedDocument):
-            content = StringField()
-
-        class BlogPost(Document):
-            content = StringField()
-            comments = ListField(EmbeddedDocumentField(Comment))
-            tags = ListField(StringField())
-
-        post = BlogPost(content='Went for a walk today...')
-        post.validate()
-
-        post.tags = 'fun'
-        self.assertRaises(ValidationError, post.validate)
-        post.tags = [1, 2]
-        self.assertRaises(ValidationError, post.validate)
-
-        post.tags = ['fun', 'leisure']
-        post.validate()
-        post.tags = ('fun', 'leisure')
-        post.validate()
-
-        comments = [Comment(content='Good for you'), Comment(content='Yay.')]
-        post.comments = comments
-        post.validate()
-
-        post.comments = ['a']
-        self.assertRaises(ValidationError, post.validate)
-        post.comments = 'yay'
-        self.assertRaises(ValidationError, post.validate)
-
-    def test_embedded_document_validation(self):
-        """Ensure that invalid embedded documents cannot be assigned to
-        embedded document fields.
-        """
-        class Comment(EmbeddedDocument):
-            content = StringField()
-
-        class PersonPreferences(EmbeddedDocument):
-            food = StringField()
-            number = IntField()
-
-        class Person(Document):
-            name = StringField()
-            preferences = EmbeddedDocumentField(PersonPreferences)
-
-        person = Person(name='Test User')
-        person.preferences = 'My Preferences'
-        self.assertRaises(ValidationError, person.validate)
-
-        person.preferences = Comment(content='Nice blog post...')
-        self.assertRaises(ValidationError, person.validate)
-
-        person.preferences = PersonPreferences(food='Cheese', number=47)
-        self.assertEqual(person.preferences.food, 'Cheese')
-        person.validate()
-
-    def test_embedded_document_inheritance(self):
-        """Ensure that subclasses of embedded documents may be provided to 
-        EmbeddedDocumentFields of the superclass' type.
-        """
-        class User(EmbeddedDocument):
-            name = StringField()
-
-        class PowerUser(User):
-            power = IntField()
-
-        class BlogPost(Document):
-            content = StringField()
-            author = EmbeddedDocumentField(User)
-        
-        post = BlogPost(content='What I did today...')
-        post.author = User(name='Test User')
-        post.author = PowerUser(name='Test User', power=47)
-
-    def test_reference_validation(self):
-        """Ensure that invalid docment objects cannot be assigned to reference
-        fields.
-        """
-        class User(Document):
-            name = StringField()
-
-        class BlogPost(Document):
-            content = StringField()
-            author = ReferenceField(User)
-
-        User.drop_collection()
-        BlogPost.drop_collection()
-
-        self.assertRaises(ValidationError, ReferenceField, EmbeddedDocument)
-
-        user = User(name='Test User')
-
-        # Ensure that the referenced object must have been saved
-        post1 = BlogPost(content='Chips and gravy taste good.')
-        post1.author = user
-        self.assertRaises(ValidationError, post1.save)
-
-        # Check that an invalid object type cannot be used
-        post2 = BlogPost(content='Chips and chilli taste good.')
-        post1.author = post2
-        self.assertRaises(ValidationError, post1.validate)
-
-        user.save()
-        post1.author = user
-        post1.save()
-
-        post2.save()
-        post1.author = post2
-        self.assertRaises(ValidationError, post1.validate)
-
-        User.drop_collection()
-        BlogPost.drop_collection()
-
-
-if __name__ == '__main__':
-    unittest.main()

tests/fields/__init__.py

@@ -0,0 +1,3 @@
+from fields import *
+from file_tests import *
+from geo import *

tests/fields/file_tests.py

@@ -0,0 +1,486 @@
+# -*- coding: utf-8 -*-
+import sys
+sys.path[0:0] = [""]
+
+import copy
+import os
+import unittest
+import tempfile
+
+import gridfs
+
+from nose.plugins.skip import SkipTest
+from mongoengine import *
+from mongoengine.connection import get_db
+from mongoengine.python_support import PY3, b, StringIO
+
+try:
+    from PIL import Image
+    HAS_PIL = True
+except ImportError:
+    HAS_PIL = False
+
+TEST_IMAGE_PATH = os.path.join(os.path.dirname(__file__), 'mongoengine.png')
+TEST_IMAGE2_PATH = os.path.join(os.path.dirname(__file__), 'mongodb_leaf.png')
+
+
+class FileTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+    def tearDown(self):
+        self.db.drop_collection('fs.files')
+        self.db.drop_collection('fs.chunks')
+
+    def test_file_field_optional(self):
+        # Make sure FileField is optional and not required
+        class DemoFile(Document):
+            the_file = FileField()
+        DemoFile.objects.create()
+
+    def test_file_fields(self):
+        """Ensure that file fields can be written to and their data retrieved
+        """
+
+        class PutFile(Document):
+            the_file = FileField()
+
+        PutFile.drop_collection()
+
+        text = b('Hello, World!')
+        content_type = 'text/plain'
+
+        putfile = PutFile()
+        putfile.the_file.put(text, content_type=content_type, filename="hello")
+        putfile.save()
+
+        result = PutFile.objects.first()
+        self.assertTrue(putfile == result)
+        self.assertEqual("%s" % result.the_file, "<GridFSProxy: hello>")
+        self.assertEqual(result.the_file.read(), text)
+        self.assertEqual(result.the_file.content_type, content_type)
+        result.the_file.delete()  # Remove file from GridFS
+        PutFile.objects.delete()
+
+        # Ensure file-like objects are stored
+        PutFile.drop_collection()
+
+        putfile = PutFile()
+        putstring = StringIO()
+        putstring.write(text)
+        putstring.seek(0)
+        putfile.the_file.put(putstring, content_type=content_type)
+        putfile.save()
+
+        result = PutFile.objects.first()
+        self.assertTrue(putfile == result)
+        self.assertEqual(result.the_file.read(), text)
+        self.assertEqual(result.the_file.content_type, content_type)
+        result.the_file.delete()
+
+    def test_file_fields_stream(self):
+        """Ensure that file fields can be written to and their data retrieved
+        """
+        class StreamFile(Document):
+            the_file = FileField()
+
+        StreamFile.drop_collection()
+
+        text = b('Hello, World!')
+        more_text = b('Foo Bar')
+        content_type = 'text/plain'
+
+        streamfile = StreamFile()
+        streamfile.the_file.new_file(content_type=content_type)
+        streamfile.the_file.write(text)
+        streamfile.the_file.write(more_text)
+        streamfile.the_file.close()
+        streamfile.save()
+
+        result = StreamFile.objects.first()
+        self.assertTrue(streamfile == result)
+        self.assertEqual(result.the_file.read(), text + more_text)
+        self.assertEqual(result.the_file.content_type, content_type)
+        result.the_file.seek(0)
+        self.assertEqual(result.the_file.tell(), 0)
+        self.assertEqual(result.the_file.read(len(text)), text)
+        self.assertEqual(result.the_file.tell(), len(text))
+        self.assertEqual(result.the_file.read(len(more_text)), more_text)
+        self.assertEqual(result.the_file.tell(), len(text + more_text))
+        result.the_file.delete()
+
+        # Ensure deleted file returns None
+        self.assertTrue(result.the_file.read() == None)
+
+    def test_file_fields_set(self):
+
+        class SetFile(Document):
+            the_file = FileField()
+
+        text = b('Hello, World!')
+        more_text = b('Foo Bar')
+
+        SetFile.drop_collection()
+
+        setfile = SetFile()
+        setfile.the_file = text
+        setfile.save()
+
+        result = SetFile.objects.first()
+        self.assertTrue(setfile == result)
+        self.assertEqual(result.the_file.read(), text)
+
+        # Try replacing file with new one
+        result.the_file.replace(more_text)
+        result.save()
+
+        result = SetFile.objects.first()
+        self.assertTrue(setfile == result)
+        self.assertEqual(result.the_file.read(), more_text)
+        result.the_file.delete()
+
+    def test_file_field_no_default(self):
+
+        class GridDocument(Document):
+            the_file = FileField()
+
+        GridDocument.drop_collection()
+
+        with tempfile.TemporaryFile() as f:
+            f.write(b("Hello World!"))
+            f.flush()
+
+            # Test without default
+            doc_a = GridDocument()
+            doc_a.save()
+
+            doc_b = GridDocument.objects.with_id(doc_a.id)
+            doc_b.the_file.replace(f, filename='doc_b')
+            doc_b.save()
+            self.assertNotEqual(doc_b.the_file.grid_id, None)
+
+            # Test it matches
+            doc_c = GridDocument.objects.with_id(doc_b.id)
+            self.assertEqual(doc_b.the_file.grid_id, doc_c.the_file.grid_id)
+
+            # Test with default
+            doc_d = GridDocument(the_file=b(''))
+            doc_d.save()
+
+            doc_e = GridDocument.objects.with_id(doc_d.id)
+            self.assertEqual(doc_d.the_file.grid_id, doc_e.the_file.grid_id)
+
+            doc_e.the_file.replace(f, filename='doc_e')
+            doc_e.save()
+
+            doc_f = GridDocument.objects.with_id(doc_e.id)
+            self.assertEqual(doc_e.the_file.grid_id, doc_f.the_file.grid_id)
+
+        db = GridDocument._get_db()
+        grid_fs = gridfs.GridFS(db)
+        self.assertEqual(['doc_b', 'doc_e'], grid_fs.list())
+
+    def test_file_uniqueness(self):
+        """Ensure that each instance of a FileField is unique
+        """
+        class TestFile(Document):
+            name = StringField()
+            the_file = FileField()
+
+        # First instance
+        test_file = TestFile()
+        test_file.name = "Hello, World!"
+        test_file.the_file.put(b('Hello, World!'))
+        test_file.save()
+
+        # Second instance
+        test_file_dupe = TestFile()
+        data = test_file_dupe.the_file.read()  # Should be None
+
+        self.assertTrue(test_file.name != test_file_dupe.name)
+        self.assertTrue(test_file.the_file.read() != data)
+
+        TestFile.drop_collection()
+
+    def test_file_saving(self):
+        """Ensure you can add meta data to file"""
+
+        class Animal(Document):
+            genus = StringField()
+            family = StringField()
+            photo = FileField()
+
+        Animal.drop_collection()
+        marmot = Animal(genus='Marmota', family='Sciuridae')
+
+        marmot_photo = open(TEST_IMAGE_PATH, 'rb')  # Retrieve a photo from disk
+        marmot.photo.put(marmot_photo, content_type='image/jpeg', foo='bar')
+        marmot.photo.close()
+        marmot.save()
+
+        marmot = Animal.objects.get()
+        self.assertEqual(marmot.photo.content_type, 'image/jpeg')
+        self.assertEqual(marmot.photo.foo, 'bar')
+
+    def test_file_reassigning(self):
+        class TestFile(Document):
+            the_file = FileField()
+        TestFile.drop_collection()
+
+        test_file = TestFile(the_file=open(TEST_IMAGE_PATH, 'rb')).save()
+        self.assertEqual(test_file.the_file.get().length, 8313)
+
+        test_file = TestFile.objects.first()
+        test_file.the_file = open(TEST_IMAGE2_PATH, 'rb')
+        test_file.save()
+        self.assertEqual(test_file.the_file.get().length, 4971)
+
+    def test_file_boolean(self):
+        """Ensure that a boolean test of a FileField indicates its presence
+        """
+        class TestFile(Document):
+            the_file = FileField()
+        TestFile.drop_collection()
+
+        test_file = TestFile()
+        self.assertFalse(bool(test_file.the_file))
+        test_file.the_file.put(b('Hello, World!'), content_type='text/plain')
+        test_file.save()
+        self.assertTrue(bool(test_file.the_file))
+
+        test_file = TestFile.objects.first()
+        self.assertEqual(test_file.the_file.content_type, "text/plain")
+
+    def test_file_cmp(self):
+        """Test comparing against other types"""
+        class TestFile(Document):
+            the_file = FileField()
+
+        test_file = TestFile()
+        self.assertFalse(test_file.the_file in [{"test": 1}])
+
+    def test_image_field(self):
+        if not HAS_PIL:
+            raise SkipTest('PIL not installed')
+
+        class TestImage(Document):
+            image = ImageField()
+
+        TestImage.drop_collection()
+
+        with tempfile.TemporaryFile() as f:
+            f.write(b("Hello World!"))
+            f.flush()
+
+            t = TestImage()
+            try:
+                t.image.put(f)
+                self.fail("Should have raised an invalidation error")
+            except ValidationError, e:
+                self.assertEquals("%s" % e, "Invalid image: cannot identify image file")
+
+        t = TestImage()
+        t.image.put(open(TEST_IMAGE_PATH, 'rb'))
+        t.save()
+
+        t = TestImage.objects.first()
+
+        self.assertEqual(t.image.format, 'PNG')
+
+        w, h = t.image.size
+        self.assertEqual(w, 371)
+        self.assertEqual(h, 76)
+
+        t.image.delete()
+
+    def test_image_field_reassigning(self):
+        if not HAS_PIL:
+            raise SkipTest('PIL not installed')
+
+        class TestFile(Document):
+            the_file = ImageField()
+        TestFile.drop_collection()
+
+        test_file = TestFile(the_file=open(TEST_IMAGE_PATH, 'rb')).save()
+        self.assertEqual(test_file.the_file.size, (371, 76))
+
+        test_file = TestFile.objects.first()
+        test_file.the_file = open(TEST_IMAGE2_PATH, 'rb')
+        test_file.save()
+        self.assertEqual(test_file.the_file.size, (45, 101))
+
+    def test_image_field_resize(self):
+        if not HAS_PIL:
+            raise SkipTest('PIL not installed')
+
+        class TestImage(Document):
+            image = ImageField(size=(185, 37))
+
+        TestImage.drop_collection()
+
+        t = TestImage()
+        t.image.put(open(TEST_IMAGE_PATH, 'rb'))
+        t.save()
+
+        t = TestImage.objects.first()
+
+        self.assertEqual(t.image.format, 'PNG')
+        w, h = t.image.size
+
+        self.assertEqual(w, 185)
+        self.assertEqual(h, 37)
+
+        t.image.delete()
+
+    def test_image_field_resize_force(self):
+        if not HAS_PIL:
+            raise SkipTest('PIL not installed')
+
+        class TestImage(Document):
+            image = ImageField(size=(185, 37, True))
+
+        TestImage.drop_collection()
+
+        t = TestImage()
+        t.image.put(open(TEST_IMAGE_PATH, 'rb'))
+        t.save()
+
+        t = TestImage.objects.first()
+
+        self.assertEqual(t.image.format, 'PNG')
+        w, h = t.image.size
+
+        self.assertEqual(w, 185)
+        self.assertEqual(h, 37)
+
+        t.image.delete()
+
+    def test_image_field_thumbnail(self):
+        if not HAS_PIL:
+            raise SkipTest('PIL not installed')
+
+        class TestImage(Document):
+            image = ImageField(thumbnail_size=(92, 18))
+
+        TestImage.drop_collection()
+
+        t = TestImage()
+        t.image.put(open(TEST_IMAGE_PATH, 'rb'))
+        t.save()
+
+        t = TestImage.objects.first()
+
+        self.assertEqual(t.image.thumbnail.format, 'PNG')
+        self.assertEqual(t.image.thumbnail.width, 92)
+        self.assertEqual(t.image.thumbnail.height, 18)
+
+        t.image.delete()
+
+    def test_file_multidb(self):
+        register_connection('test_files', 'test_files')
+
+        class TestFile(Document):
+            name = StringField()
+            the_file = FileField(db_alias="test_files",
+                                 collection_name="macumba")
+
+        TestFile.drop_collection()
+
+        # delete old filesystem
+        get_db("test_files").macumba.files.drop()
+        get_db("test_files").macumba.chunks.drop()
+
+        # First instance
+        test_file = TestFile()
+        test_file.name = "Hello, World!"
+        test_file.the_file.put(b('Hello, World!'),
+                          name="hello.txt")
+        test_file.save()
+
+        data = get_db("test_files").macumba.files.find_one()
+        self.assertEqual(data.get('name'), 'hello.txt')
+
+        test_file = TestFile.objects.first()
+        self.assertEqual(test_file.the_file.read(),
+                          b('Hello, World!'))
+
+        test_file = TestFile.objects.first()
+        test_file.the_file = b('HELLO, WORLD!')
+        test_file.save()
+
+        test_file = TestFile.objects.first()
+        self.assertEqual(test_file.the_file.read(),
+                          b('HELLO, WORLD!'))
+
+    def test_copyable(self):
+        class PutFile(Document):
+            the_file = FileField()
+
+        PutFile.drop_collection()
+
+        text = b('Hello, World!')
+        content_type = 'text/plain'
+
+        putfile = PutFile()
+        putfile.the_file.put(text, content_type=content_type)
+        putfile.save()
+
+        class TestFile(Document):
+            name = StringField()
+
+        self.assertEqual(putfile, copy.copy(putfile))
+        self.assertEqual(putfile, copy.deepcopy(putfile))
+
+    def test_get_image_by_grid_id(self):
+
+        if not HAS_PIL:
+            raise SkipTest('PIL not installed')
+
+        class TestImage(Document):
+
+            image1 = ImageField()
+            image2 = ImageField()
+
+        TestImage.drop_collection()
+
+        t = TestImage()
+        t.image1.put(open(TEST_IMAGE_PATH, 'rb'))
+        t.image2.put(open(TEST_IMAGE2_PATH, 'rb'))
+        t.save()
+
+        test = TestImage.objects.first()
+        grid_id = test.image1.grid_id
+
+        self.assertEqual(1, TestImage.objects(Q(image1=grid_id)
+                                              or Q(image2=grid_id)).count())
+
+    def test_complex_field_filefield(self):
+        """Ensure you can add meta data to file"""
+
+        class Animal(Document):
+            genus = StringField()
+            family = StringField()
+            photos = ListField(FileField())
+
+        Animal.drop_collection()
+        marmot = Animal(genus='Marmota', family='Sciuridae')
+
+        marmot_photo = open(TEST_IMAGE_PATH, 'rb')  # Retrieve a photo from disk
+
+        photos_field = marmot._fields['photos'].field
+        new_proxy = photos_field.get_proxy_obj('photos', marmot)
+        new_proxy.put(marmot_photo, content_type='image/jpeg', foo='bar')
+        marmot_photo.close()
+
+        marmot.photos.append(new_proxy)
+        marmot.save()
+
+        marmot = Animal.objects.get()
+        self.assertEqual(marmot.photos[0].content_type, 'image/jpeg')
+        self.assertEqual(marmot.photos[0].foo, 'bar')
+        self.assertEqual(marmot.photos[0].get().length, 8313)
+
+if __name__ == '__main__':
+    unittest.main()

tests/fields/geo.py

@@ -0,0 +1,274 @@
+# -*- coding: utf-8 -*-
+import sys
+sys.path[0:0] = [""]
+
+import unittest
+
+from mongoengine import *
+from mongoengine.connection import get_db
+
+__all__ = ("GeoFieldTest", )
+
+
+class GeoFieldTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+    def _test_for_expected_error(self, Cls, loc, expected):
+        try:
+            Cls(loc=loc).validate()
+            self.fail()
+        except ValidationError, e:
+            self.assertEqual(expected, e.to_dict()['loc'])
+
+    def test_geopoint_validation(self):
+        class Location(Document):
+            loc = GeoPointField()
+
+        invalid_coords = [{"x": 1, "y": 2}, 5, "a"]
+        expected = 'GeoPointField can only accept tuples or lists of (x, y)'
+
+        for coord in invalid_coords:
+            self._test_for_expected_error(Location, coord, expected)
+
+        invalid_coords = [[], [1], [1, 2, 3]]
+        for coord in invalid_coords:
+            expected = "Value (%s) must be a two-dimensional point" % repr(coord)
+            self._test_for_expected_error(Location, coord, expected)
+
+        invalid_coords = [[{}, {}], ("a", "b")]
+        for coord in invalid_coords:
+            expected = "Both values (%s) in point must be float or int" % repr(coord)
+            self._test_for_expected_error(Location, coord, expected)
+
+    def test_point_validation(self):
+        class Location(Document):
+            loc = PointField()
+
+        invalid_coords = {"x": 1, "y": 2}
+        expected = 'PointField can only accept a valid GeoJson dictionary or lists of (x, y)'
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = {"type": "MadeUp", "coordinates": []}
+        expected = 'PointField type must be "Point"'
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = {"type": "Point", "coordinates": [1, 2, 3]}
+        expected = "Value ([1, 2, 3]) must be a two-dimensional point"
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [5, "a"]
+        expected = "PointField can only accept lists of [x, y]"
+        for coord in invalid_coords:
+            self._test_for_expected_error(Location, coord, expected)
+
+        invalid_coords = [[], [1], [1, 2, 3]]
+        for coord in invalid_coords:
+            expected = "Value (%s) must be a two-dimensional point" % repr(coord)
+            self._test_for_expected_error(Location, coord, expected)
+
+        invalid_coords = [[{}, {}], ("a", "b")]
+        for coord in invalid_coords:
+            expected = "Both values (%s) in point must be float or int" % repr(coord)
+            self._test_for_expected_error(Location, coord, expected)
+
+        Location(loc=[1, 2]).validate()
+
+    def test_linestring_validation(self):
+        class Location(Document):
+            loc = LineStringField()
+
+        invalid_coords = {"x": 1, "y": 2}
+        expected = 'LineStringField can only accept a valid GeoJson dictionary or lists of (x, y)'
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = {"type": "MadeUp", "coordinates": [[]]}
+        expected = 'LineStringField type must be "LineString"'
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = {"type": "LineString", "coordinates": [[1, 2, 3]]}
+        expected = "Invalid LineString:\nValue ([1, 2, 3]) must be a two-dimensional point"
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [5, "a"]
+        expected = "Invalid LineString must contain at least one valid point"
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [[1]]
+        expected = "Invalid LineString:\nValue (%s) must be a two-dimensional point" % repr(invalid_coords[0])
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [[1, 2, 3]]
+        expected = "Invalid LineString:\nValue (%s) must be a two-dimensional point" % repr(invalid_coords[0])
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [[[{}, {}]], [("a", "b")]]
+        for coord in invalid_coords:
+            expected = "Invalid LineString:\nBoth values (%s) in point must be float or int" % repr(coord[0])
+            self._test_for_expected_error(Location, coord, expected)
+
+        Location(loc=[[1, 2], [3, 4], [5, 6], [1,2]]).validate()
+
+    def test_polygon_validation(self):
+        class Location(Document):
+            loc = PolygonField()
+
+        invalid_coords = {"x": 1, "y": 2}
+        expected = 'PolygonField can only accept a valid GeoJson dictionary or lists of (x, y)'
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = {"type": "MadeUp", "coordinates": [[]]}
+        expected = 'PolygonField type must be "Polygon"'
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = {"type": "Polygon", "coordinates": [[[1, 2, 3]]]}
+        expected = "Invalid Polygon:\nValue ([1, 2, 3]) must be a two-dimensional point"
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [[[5, "a"]]]
+        expected = "Invalid Polygon:\nBoth values ([5, 'a']) in point must be float or int"
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [[[]]]
+        expected = "Invalid Polygon must contain at least one valid linestring"
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [[[1, 2, 3]]]
+        expected = "Invalid Polygon:\nValue ([1, 2, 3]) must be a two-dimensional point"
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [[[{}, {}]], [("a", "b")]]
+        expected = "Invalid Polygon:\nBoth values ([{}, {}]) in point must be float or int, Both values (('a', 'b')) in point must be float or int"
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        invalid_coords = [[[1, 2], [3, 4]]]
+        expected = "Invalid Polygon:\nLineStrings must start and end at the same point"
+        self._test_for_expected_error(Location, invalid_coords, expected)
+
+        Location(loc=[[[1, 2], [3, 4], [5, 6], [1, 2]]]).validate()
+
+    def test_indexes_geopoint(self):
+        """Ensure that indexes are created automatically for GeoPointFields.
+        """
+        class Event(Document):
+            title = StringField()
+            location = GeoPointField()
+
+        geo_indicies = Event._geo_indices()
+        self.assertEqual(geo_indicies, [{'fields': [('location', '2d')]}])
+
+    def test_geopoint_embedded_indexes(self):
+        """Ensure that indexes are created automatically for GeoPointFields on
+        embedded documents.
+        """
+        class Venue(EmbeddedDocument):
+            location = GeoPointField()
+            name = StringField()
+
+        class Event(Document):
+            title = StringField()
+            venue = EmbeddedDocumentField(Venue)
+
+        geo_indicies = Event._geo_indices()
+        self.assertEqual(geo_indicies, [{'fields': [('venue.location', '2d')]}])
+
+    def test_indexes_2dsphere(self):
+        """Ensure that indexes are created automatically for GeoPointFields.
+        """
+        class Event(Document):
+            title = StringField()
+            point = PointField()
+            line = LineStringField()
+            polygon = PolygonField()
+
+        geo_indicies = Event._geo_indices()
+        self.assertTrue({'fields': [('line', '2dsphere')]} in geo_indicies)
+        self.assertTrue({'fields': [('polygon', '2dsphere')]} in geo_indicies)
+        self.assertTrue({'fields': [('point', '2dsphere')]} in geo_indicies)
+
+    def test_indexes_2dsphere_embedded(self):
+        """Ensure that indexes are created automatically for GeoPointFields.
+        """
+        class Venue(EmbeddedDocument):
+            name = StringField()
+            point = PointField()
+            line = LineStringField()
+            polygon = PolygonField()
+
+        class Event(Document):
+            title = StringField()
+            venue = EmbeddedDocumentField(Venue)
+
+        geo_indicies = Event._geo_indices()
+        self.assertTrue({'fields': [('venue.line', '2dsphere')]} in geo_indicies)
+        self.assertTrue({'fields': [('venue.polygon', '2dsphere')]} in geo_indicies)
+        self.assertTrue({'fields': [('venue.point', '2dsphere')]} in geo_indicies)
+
+    def test_geo_indexes_recursion(self):
+
+        class Location(Document):
+            name = StringField()
+            location = GeoPointField()
+
+        class Parent(Document):
+            name = StringField()
+            location = ReferenceField(Location)
+
+        Location.drop_collection()
+        Parent.drop_collection()
+
+        list(Parent.objects)
+
+        collection = Parent._get_collection()
+        info = collection.index_information()
+
+        self.assertFalse('location_2d' in info)
+
+        self.assertEqual(len(Parent._geo_indices()), 0)
+        self.assertEqual(len(Location._geo_indices()), 1)
+
+    def test_geo_indexes_auto_index(self):
+
+        # Test just listing the fields
+        class Log(Document):
+            location = PointField(auto_index=False)
+            datetime = DateTimeField()
+
+            meta = {
+                'indexes': [[("location", "2dsphere"), ("datetime", 1)]]
+            }
+
+        self.assertEqual([], Log._geo_indices())
+
+        Log.drop_collection()
+        Log.ensure_indexes()
+
+        info = Log._get_collection().index_information()
+        self.assertEqual(info["location_2dsphere_datetime_1"]["key"],
+                         [('location', '2dsphere'), ('datetime', 1)])
+
+        # Test listing explicitly
+        class Log(Document):
+            location = PointField(auto_index=False)
+            datetime = DateTimeField()
+
+            meta = {
+                'indexes': [
+                    {'fields': [("location", "2dsphere"), ("datetime", 1)]}
+                ]
+            }
+
+        self.assertEqual([], Log._geo_indices())
+
+        Log.drop_collection()
+        Log.ensure_indexes()
+
+        info = Log._get_collection().index_information()
+        self.assertEqual(info["location_2dsphere_datetime_1"]["key"],
+                         [('location', '2dsphere'), ('datetime', 1)])
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/fixtures.py

@@ -0,0 +1,51 @@
+import pickle
+from datetime import datetime
+
+from mongoengine import *
+from mongoengine import signals
+
+
+class PickleEmbedded(EmbeddedDocument):
+    date = DateTimeField(default=datetime.now)
+
+
+class PickleTest(Document):
+    number = IntField()
+    string = StringField(choices=(('One', '1'), ('Two', '2')))
+    embedded = EmbeddedDocumentField(PickleEmbedded)
+    lists = ListField(StringField())
+    photo = FileField()
+
+
+class PickleDyanmicEmbedded(DynamicEmbeddedDocument):
+    date = DateTimeField(default=datetime.now)
+
+
+class PickleDynamicTest(DynamicDocument):
+    number = IntField()
+
+
+class PickleSignalsTest(Document):
+    number = IntField()
+    string = StringField(choices=(('One', '1'), ('Two', '2')))
+    embedded = EmbeddedDocumentField(PickleEmbedded)
+    lists = ListField(StringField())
+
+    @classmethod
+    def post_save(self, sender, document, created, **kwargs):
+        pickled = pickle.dumps(document)
+
+    @classmethod
+    def post_delete(self, sender, document, **kwargs):
+        pickled = pickle.dumps(document)
+
+signals.post_save.connect(PickleSignalsTest.post_save, sender=PickleSignalsTest)
+signals.post_delete.connect(PickleSignalsTest.post_delete, sender=PickleSignalsTest)
+
+
+class Mixin(object):
+    name = StringField()
+
+
+class Base(Document):
+    meta = {'allow_inheritance': True}

tests/migration/__init__.py

@@ -0,0 +1,8 @@
+from convert_to_new_inheritance_model import *
+from decimalfield_as_float import *
+from refrencefield_dbref_to_object_id import *
+from turn_off_inheritance import *
+from uuidfield_to_binary import *
+
+if __name__ == '__main__':
+    unittest.main()

tests/migration/convert_to_new_inheritance_model.py

@@ -0,0 +1,51 @@
+# -*- coding: utf-8 -*-
+import unittest
+
+from mongoengine import Document, connect
+from mongoengine.connection import get_db
+from mongoengine.fields import StringField
+
+__all__ = ('ConvertToNewInheritanceModel', )
+
+
+class ConvertToNewInheritanceModel(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+    def tearDown(self):
+        for collection in self.db.collection_names():
+            if 'system.' in collection:
+                continue
+            self.db.drop_collection(collection)
+
+    def test_how_to_convert_to_the_new_inheritance_model(self):
+        """Demonstrates migrating from 0.7 to 0.8
+        """
+
+        # 1. Declaration of the class
+        class Animal(Document):
+            name = StringField()
+            meta = {
+                'allow_inheritance': True,
+                'indexes': ['name']
+            }
+
+        # 2. Remove _types
+        collection = Animal._get_collection()
+        collection.update({}, {"$unset": {"_types": 1}}, multi=True)
+
+        # 3. Confirm extra data is removed
+        count = collection.find({'_types': {"$exists": True}}).count()
+        self.assertEqual(0, count)
+
+        # 4. Remove indexes
+        info = collection.index_information()
+        indexes_to_drop = [key for key, value in info.iteritems()
+                           if '_types' in dict(value['key'])]
+        for index in indexes_to_drop:
+            collection.drop_index(index)
+
+        # 5. Recreate indexes
+        Animal.ensure_indexes()

tests/migration/decimalfield_as_float.py

@@ -0,0 +1,50 @@
+ # -*- coding: utf-8 -*-
+import unittest
+import decimal
+from decimal import Decimal
+
+from mongoengine import Document, connect
+from mongoengine.connection import get_db
+from mongoengine.fields import StringField, DecimalField, ListField
+
+__all__ = ('ConvertDecimalField', )
+
+
+class ConvertDecimalField(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+    def test_how_to_convert_decimal_fields(self):
+        """Demonstrates migrating from 0.7 to 0.8
+        """
+
+        # 1. Old definition - using dbrefs
+        class Person(Document):
+            name = StringField()
+            money = DecimalField(force_string=True)
+            monies = ListField(DecimalField(force_string=True))
+
+        Person.drop_collection()
+        Person(name="Wilson Jr", money=Decimal("2.50"),
+               monies=[Decimal("2.10"), Decimal("5.00")]).save()
+
+        # 2. Start the migration by changing the schema
+        # Change DecimalField - add precision and rounding settings
+        class Person(Document):
+            name = StringField()
+            money = DecimalField(precision=2, rounding=decimal.ROUND_HALF_UP)
+            monies = ListField(DecimalField(precision=2,
+                                            rounding=decimal.ROUND_HALF_UP))
+
+        # 3. Loop all the objects and mark parent as changed
+        for p in Person.objects:
+            p._mark_as_changed('money')
+            p._mark_as_changed('monies')
+            p.save()
+
+        # 4. Confirmation of the fix!
+        wilson = Person.objects(name="Wilson Jr").as_pymongo()[0]
+        self.assertTrue(isinstance(wilson['money'], float))
+        self.assertTrue(all([isinstance(m, float) for m in wilson['monies']]))

tests/migration/refrencefield_dbref_to_object_id.py

@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+import unittest
+
+from mongoengine import Document, connect
+from mongoengine.connection import get_db
+from mongoengine.fields import StringField, ReferenceField, ListField
+
+__all__ = ('ConvertToObjectIdsModel', )
+
+
+class ConvertToObjectIdsModel(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+    def test_how_to_convert_to_object_id_reference_fields(self):
+        """Demonstrates migrating from 0.7 to 0.8
+        """
+
+        # 1. Old definition - using dbrefs
+        class Person(Document):
+            name = StringField()
+            parent = ReferenceField('self', dbref=True)
+            friends = ListField(ReferenceField('self', dbref=True))
+
+        Person.drop_collection()
+
+        p1 = Person(name="Wilson", parent=None).save()
+        f1 = Person(name="John", parent=None).save()
+        f2 = Person(name="Paul", parent=None).save()
+        f3 = Person(name="George", parent=None).save()
+        f4 = Person(name="Ringo", parent=None).save()
+        Person(name="Wilson Jr", parent=p1, friends=[f1, f2, f3, f4]).save()
+
+        # 2. Start the migration by changing the schema
+        # Change ReferenceField as now dbref defaults to False
+        class Person(Document):
+            name = StringField()
+            parent = ReferenceField('self')
+            friends = ListField(ReferenceField('self'))
+
+        # 3. Loop all the objects and mark parent as changed
+        for p in Person.objects:
+            p._mark_as_changed('parent')
+            p._mark_as_changed('friends')
+            p.save()
+
+        # 4. Confirmation of the fix!
+        wilson = Person.objects(name="Wilson Jr").as_pymongo()[0]
+        self.assertEqual(p1.id, wilson['parent'])
+        self.assertEqual([f1.id, f2.id, f3.id, f4.id], wilson['friends'])

tests/migration/turn_off_inheritance.py

@@ -0,0 +1,62 @@
+# -*- coding: utf-8 -*-
+import unittest
+
+from mongoengine import Document, connect
+from mongoengine.connection import get_db
+from mongoengine.fields import StringField
+
+__all__ = ('TurnOffInheritanceTest', )
+
+
+class TurnOffInheritanceTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+    def tearDown(self):
+        for collection in self.db.collection_names():
+            if 'system.' in collection:
+                continue
+            self.db.drop_collection(collection)
+
+    def test_how_to_turn_off_inheritance(self):
+        """Demonstrates migrating from allow_inheritance = True to False.
+        """
+
+        # 1. Old declaration of the class
+
+        class Animal(Document):
+            name = StringField()
+            meta = {
+                'allow_inheritance': True,
+                'indexes': ['name']
+            }
+
+        # 2. Turn off inheritance
+        class Animal(Document):
+            name = StringField()
+            meta = {
+                'allow_inheritance': False,
+                'indexes': ['name']
+            }
+
+        # 3. Remove _types and _cls
+        collection = Animal._get_collection()
+        collection.update({}, {"$unset": {"_types": 1, "_cls": 1}}, multi=True)
+
+        # 3. Confirm extra data is removed
+        count = collection.find({"$or": [{'_types': {"$exists": True}},
+                                         {'_cls': {"$exists": True}}]}).count()
+        assert count == 0
+
+        # 4. Remove indexes
+        info = collection.index_information()
+        indexes_to_drop = [key for key, value in info.iteritems()
+                           if '_types' in dict(value['key'])
+                              or '_cls' in dict(value['key'])]
+        for index in indexes_to_drop:
+            collection.drop_index(index)
+
+        # 5. Recreate indexes
+        Animal.ensure_indexes()

tests/migration/uuidfield_to_binary.py

@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+import unittest
+import uuid
+
+from mongoengine import Document, connect
+from mongoengine.connection import get_db
+from mongoengine.fields import StringField, UUIDField, ListField
+
+__all__ = ('ConvertToBinaryUUID', )
+
+
+class ConvertToBinaryUUID(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+    def test_how_to_convert_to_binary_uuid_fields(self):
+        """Demonstrates migrating from 0.7 to 0.8
+        """
+
+        # 1. Old definition - using dbrefs
+        class Person(Document):
+            name = StringField()
+            uuid = UUIDField(binary=False)
+            uuids = ListField(UUIDField(binary=False))
+
+        Person.drop_collection()
+        Person(name="Wilson Jr", uuid=uuid.uuid4(),
+               uuids=[uuid.uuid4(), uuid.uuid4()]).save()
+
+        # 2. Start the migration by changing the schema
+        # Change UUIDFIeld as now binary defaults to True
+        class Person(Document):
+            name = StringField()
+            uuid = UUIDField()
+            uuids = ListField(UUIDField())
+
+        # 3. Loop all the objects and mark parent as changed
+        for p in Person.objects:
+            p._mark_as_changed('uuid')
+            p._mark_as_changed('uuids')
+            p.save()
+
+        # 4. Confirmation of the fix!
+        wilson = Person.objects(name="Wilson Jr").as_pymongo()[0]
+        self.assertTrue(isinstance(wilson['uuid'], uuid.UUID))
+        self.assertTrue(all([isinstance(u, uuid.UUID) for u in wilson['uuids']]))

tests/queryset.py

@@ -1,542 +0,0 @@
-import unittest
-import pymongo
-from datetime import datetime
-
-from mongoengine.queryset import QuerySet
-from mongoengine import *
-
-
-class QuerySetTest(unittest.TestCase):
-    
-    def setUp(self):
-        connect(db='mongoenginetest')
-
-        class Person(Document):
-            name = StringField()
-            age = IntField()
-        self.Person = Person
-
-    def test_initialisation(self):
-        """Ensure that a QuerySet is correctly initialised by QuerySetManager.
-        """
-        self.assertTrue(isinstance(self.Person.objects, QuerySet))
-        self.assertEqual(self.Person.objects._collection.name(), 
-                         self.Person._meta['collection'])
-        self.assertTrue(isinstance(self.Person.objects._collection,
-                                   pymongo.collection.Collection))
-
-    def test_transform_query(self):
-        """Ensure that the _transform_query function operates correctly.
-        """
-        self.assertEqual(QuerySet._transform_query(name='test', age=30),
-                         {'name': 'test', 'age': 30})
-        self.assertEqual(QuerySet._transform_query(age__lt=30), 
-                         {'age': {'$lt': 30}})
-        self.assertEqual(QuerySet._transform_query(age__gt=20, age__lt=50),
-                         {'age': {'$gt': 20, '$lt': 50}})
-        self.assertEqual(QuerySet._transform_query(age=20, age__gt=50),
-                         {'age': 20})
-        self.assertEqual(QuerySet._transform_query(friend__age__gte=30), 
-                         {'friend.age': {'$gte': 30}})
-        self.assertEqual(QuerySet._transform_query(name__exists=True), 
-                         {'name': {'$exists': True}})
-
-    def test_find(self):
-        """Ensure that a query returns a valid set of results.
-        """
-        person1 = self.Person(name="User A", age=20)
-        person1.save()
-        person2 = self.Person(name="User B", age=30)
-        person2.save()
-
-        q1 = Q(name='test')
-        q2 = Q(age__gte=18)
-
-        # Find all people in the collection
-        people = self.Person.objects
-        self.assertEqual(len(people), 2)
-        results = list(people)
-        self.assertTrue(isinstance(results[0], self.Person))
-        self.assertTrue(isinstance(results[0].id, (pymongo.objectid.ObjectId,
-                                                    str, unicode)))
-        self.assertEqual(results[0].name, "User A")
-        self.assertEqual(results[0].age, 20)
-        self.assertEqual(results[1].name, "User B")
-        self.assertEqual(results[1].age, 30)
-
-        # Use a query to filter the people found to just person1
-        people = self.Person.objects(age=20)
-        self.assertEqual(len(people), 1)
-        person = people.next()
-        self.assertEqual(person.name, "User A")
-        self.assertEqual(person.age, 20)
-
-        # Test limit
-        people = list(self.Person.objects.limit(1))
-        self.assertEqual(len(people), 1)
-        self.assertEqual(people[0].name, 'User A')
-
-        # Test skip
-        people = list(self.Person.objects.skip(1))
-        self.assertEqual(len(people), 1)
-        self.assertEqual(people[0].name, 'User B')
-
-        person3 = self.Person(name="User C", age=40)
-        person3.save()
-
-        # Test slice limit
-        people = list(self.Person.objects[:2])
-        self.assertEqual(len(people), 2)
-        self.assertEqual(people[0].name, 'User A')
-        self.assertEqual(people[1].name, 'User B')
-
-        # Test slice skip
-        people = list(self.Person.objects[1:])
-        self.assertEqual(len(people), 2)
-        self.assertEqual(people[0].name, 'User B')
-        self.assertEqual(people[1].name, 'User C')
-
-        # Test slice limit and skip
-        people = list(self.Person.objects[1:2])
-        self.assertEqual(len(people), 1)
-        self.assertEqual(people[0].name, 'User B')
-
-    def test_find_one(self):
-        """Ensure that a query using find_one returns a valid result.
-        """
-        person1 = self.Person(name="User A", age=20)
-        person1.save()
-        person2 = self.Person(name="User B", age=30)
-        person2.save()
-
-        # Retrieve the first person from the database
-        person = self.Person.objects.first()
-        self.assertTrue(isinstance(person, self.Person))
-        self.assertEqual(person.name, "User A")
-        self.assertEqual(person.age, 20)
-
-        # Use a query to filter the people found to just person2
-        person = self.Person.objects(age=30).first()
-        self.assertEqual(person.name, "User B")
-
-        person = self.Person.objects(age__lt=30).first()
-        self.assertEqual(person.name, "User A")
-
-        # Use array syntax
-        person = self.Person.objects[0]
-        self.assertEqual(person.name, "User A")
-
-        person = self.Person.objects[1]
-        self.assertEqual(person.name, "User B")
-
-        self.assertRaises(IndexError, self.Person.objects.__getitem__, 2)
-        
-        # Find a document using just the object id
-        person = self.Person.objects.with_id(person1.id)
-        self.assertEqual(person.name, "User A")
-
-    def test_filter_chaining(self):
-        """Ensure filters can be chained together.
-        """
-        from datetime import datetime
-        
-        class BlogPost(Document):
-            title = StringField()
-            is_published = BooleanField()
-            published_date = DateTimeField()
-            
-            @queryset_manager
-            def published(queryset):
-                return queryset(is_published=True)
-                
-        blog_post_1 = BlogPost(title="Blog Post #1", 
-                               is_published = True,
-                               published_date=datetime(2010, 1, 5, 0, 0 ,0))
-        blog_post_2 = BlogPost(title="Blog Post #2", 
-                               is_published = True,
-                               published_date=datetime(2010, 1, 6, 0, 0 ,0))
-        blog_post_3 = BlogPost(title="Blog Post #3", 
-                               is_published = True,
-                               published_date=datetime(2010, 1, 7, 0, 0 ,0))
-
-        blog_post_1.save()
-        blog_post_2.save()
-        blog_post_3.save()
-        
-        # find all published blog posts before 2010-01-07
-        published_posts = BlogPost.published()
-        published_posts = published_posts.filter(
-            published_date__lt=datetime(2010, 1, 7, 0, 0 ,0))
-        self.assertEqual(published_posts.count(), 2)
-        
-        BlogPost.drop_collection()
-
-    def test_ordering(self):
-        """Ensure default ordering is applied and can be overridden.
-        """
-        class BlogPost(Document):
-            title = StringField()
-            published_date = DateTimeField()
-
-            meta = {
-                'ordering': ['-published_date']
-            }
-
-        BlogPost.drop_collection()
-
-        blog_post_1 = BlogPost(title="Blog Post #1", 
-                               published_date=datetime(2010, 1, 5, 0, 0 ,0))
-        blog_post_2 = BlogPost(title="Blog Post #2", 
-                               published_date=datetime(2010, 1, 6, 0, 0 ,0))
-        blog_post_3 = BlogPost(title="Blog Post #3", 
-                               published_date=datetime(2010, 1, 7, 0, 0 ,0))
-
-        blog_post_1.save()
-        blog_post_2.save()
-        blog_post_3.save()
-        
-        # get the "first" BlogPost using default ordering
-        # from BlogPost.meta.ordering
-        latest_post = BlogPost.objects.first() 
-        self.assertEqual(latest_post.title, "Blog Post #3")
-        
-        # override default ordering, order BlogPosts by "published_date"
-        first_post = BlogPost.objects.order_by("+published_date").first()
-        self.assertEqual(first_post.title, "Blog Post #1")
-
-        BlogPost.drop_collection()
-
-    def test_find_embedded(self):
-        """Ensure that an embedded document is properly returned from a query.
-        """
-        class User(EmbeddedDocument):
-            name = StringField()
-
-        class BlogPost(Document):
-            content = StringField()
-            author = EmbeddedDocumentField(User)
-
-        BlogPost.drop_collection()
-
-        post = BlogPost(content='Had a good coffee today...')
-        post.author = User(name='Test User')
-        post.save()
-
-        result = BlogPost.objects.first()
-        self.assertTrue(isinstance(result.author, User))
-        self.assertEqual(result.author.name, 'Test User')
-        
-        BlogPost.drop_collection()
-
-    def test_q(self):
-        class BlogPost(Document):
-            publish_date = DateTimeField()
-            published = BooleanField()
-
-        BlogPost.drop_collection()
-
-        post1 = BlogPost(publish_date=datetime(2010, 1, 8), published=False)
-        post1.save()
-
-        post2 = BlogPost(publish_date=datetime(2010, 1, 15), published=True)
-        post2.save()
-
-        post3 = BlogPost(published=True)
-        post3.save()
-
-        post4 = BlogPost(publish_date=datetime(2010, 1, 8))
-        post4.save()
-
-        post5 = BlogPost(publish_date=datetime(2010, 1, 15))
-        post5.save()
-
-        post6 = BlogPost(published=False)
-        post6.save()
-
-        date = datetime(2010, 1, 10)
-        q = BlogPost.objects(Q(publish_date__lte=date) | Q(published=True))
-        posts = [post.id for post in q]
-
-        published_posts = (post1, post2, post3, post4)
-        self.assertTrue(all(obj.id in posts for obj in published_posts))
-
-        self.assertFalse(any(obj.id in posts for obj in [post5, post6]))
-
-        BlogPost.drop_collection()
-
-    def test_delete(self):
-        """Ensure that documents are properly deleted from the database.
-        """
-        self.Person(name="User A", age=20).save()
-        self.Person(name="User B", age=30).save()
-        self.Person(name="User C", age=40).save()
-
-        self.assertEqual(len(self.Person.objects), 3)
-
-        self.Person.objects(age__lt=30).delete()
-        self.assertEqual(len(self.Person.objects), 2)
-
-        self.Person.objects.delete()
-        self.assertEqual(len(self.Person.objects), 0)
-
-    def test_update(self):
-        """Ensure that atomic updates work properly.
-        """
-        class BlogPost(Document):
-            title = StringField()
-            hits = IntField()
-            tags = ListField(StringField())
-
-        BlogPost.drop_collection()
-
-        post = BlogPost(name="Test Post", hits=5, tags=['test'])
-        post.save()
-
-        BlogPost.objects.update(set__hits=10)
-        post.reload()
-        self.assertEqual(post.hits, 10)
-
-        BlogPost.objects.update_one(inc__hits=1)
-        post.reload()
-        self.assertEqual(post.hits, 11)
-
-        BlogPost.objects.update_one(dec__hits=1)
-        post.reload()
-        self.assertEqual(post.hits, 10)
-
-        BlogPost.objects.update(push__tags='mongo')
-        post.reload()
-        self.assertTrue('mongo' in post.tags)
-
-        BlogPost.objects.update_one(push_all__tags=['db', 'nosql'])
-        post.reload()
-        self.assertTrue('db' in post.tags and 'nosql' in post.tags)
-
-        BlogPost.drop_collection()
-
-    def test_order_by(self):
-        """Ensure that QuerySets may be ordered.
-        """
-        self.Person(name="User A", age=20).save()
-        self.Person(name="User B", age=40).save()
-        self.Person(name="User C", age=30).save()
-
-        names = [p.name for p in self.Person.objects.order_by('-age')]
-        self.assertEqual(names, ['User B', 'User C', 'User A'])
-
-        names = [p.name for p in self.Person.objects.order_by('+age')]
-        self.assertEqual(names, ['User A', 'User C', 'User B'])
-
-        names = [p.name for p in self.Person.objects.order_by('age')]
-        self.assertEqual(names, ['User A', 'User C', 'User B'])
-        
-        ages = [p.age for p in self.Person.objects.order_by('-name')]
-        self.assertEqual(ages, [30, 40, 20])
-
-    def test_item_frequencies(self):
-        """Ensure that item frequencies are properly generated from lists.
-        """
-        class BlogPost(Document):
-            hits = IntField()
-            tags = ListField(StringField(), name='blogTags')
-
-        BlogPost.drop_collection()
-
-        BlogPost(hits=1, tags=['music', 'film', 'actors']).save()
-        BlogPost(hits=2, tags=['music']).save()
-        BlogPost(hits=3, tags=['music', 'actors']).save()
-
-        f = BlogPost.objects.item_frequencies('tags')
-        f = dict((key, int(val)) for key, val in f.items())
-        self.assertEqual(set(['music', 'film', 'actors']), set(f.keys()))
-        self.assertEqual(f['music'], 3)
-        self.assertEqual(f['actors'], 2)
-        self.assertEqual(f['film'], 1)
-
-        # Ensure query is taken into account
-        f = BlogPost.objects(hits__gt=1).item_frequencies('tags')
-        f = dict((key, int(val)) for key, val in f.items())
-        self.assertEqual(set(['music', 'actors']), set(f.keys()))
-        self.assertEqual(f['music'], 2)
-        self.assertEqual(f['actors'], 1)
-
-        # Check that normalization works
-        f = BlogPost.objects.item_frequencies('tags', normalize=True)
-        self.assertAlmostEqual(f['music'], 3.0/6.0)
-        self.assertAlmostEqual(f['actors'], 2.0/6.0)
-        self.assertAlmostEqual(f['film'], 1.0/6.0)
-
-        BlogPost.drop_collection()
-
-    def test_average(self):
-        """Ensure that field can be averaged correctly.
-        """
-        ages = [23, 54, 12, 94, 27]
-        for i, age in enumerate(ages):
-            self.Person(name='test%s' % i, age=age).save()
-
-        avg = float(sum(ages)) / len(ages)
-        self.assertAlmostEqual(int(self.Person.objects.average('age')), avg)
-
-        self.Person(name='ageless person').save()
-        self.assertEqual(int(self.Person.objects.average('age')), avg)
-
-    def test_sum(self):
-        """Ensure that field can be summed over correctly.
-        """
-        ages = [23, 54, 12, 94, 27]
-        for i, age in enumerate(ages):
-            self.Person(name='test%s' % i, age=age).save()
-
-        self.assertEqual(int(self.Person.objects.sum('age')), sum(ages))
-
-        self.Person(name='ageless person').save()
-        self.assertEqual(int(self.Person.objects.sum('age')), sum(ages))
-
-    def test_custom_manager(self):
-        """Ensure that custom QuerySetManager instances work as expected.
-        """
-        class BlogPost(Document):
-            tags = ListField(StringField())
-
-            @queryset_manager
-            def music_posts(queryset):
-                return queryset(tags='music')
-
-        BlogPost.drop_collection()
-
-        post1 = BlogPost(tags=['music', 'film'])
-        post1.save()
-        post2 = BlogPost(tags=['music'])
-        post2.save()
-        post3 = BlogPost(tags=['film', 'actors'])
-        post3.save()
-
-        self.assertEqual([p.id for p in BlogPost.objects],
-                         [post1.id, post2.id, post3.id])
-        self.assertEqual([p.id for p in BlogPost.music_posts],
-                         [post1.id, post2.id])
-
-        BlogPost.drop_collection()
-
-    def test_query_field_name(self):
-        """Ensure that the correct field name is used when querying.
-        """
-        class Comment(EmbeddedDocument):
-            content = StringField(name='commentContent')
-
-        class BlogPost(Document):
-            title = StringField(name='postTitle')
-            comments = ListField(EmbeddedDocumentField(Comment),
-                                 name='postComments')
-                                 
-
-        BlogPost.drop_collection()
-
-        data = {'title': 'Post 1', 'comments': [Comment(content='test')]}
-        BlogPost(**data).save()
-
-        self.assertTrue('postTitle' in 
-                        BlogPost.objects(title=data['title'])._query)
-        self.assertFalse('title' in 
-                         BlogPost.objects(title=data['title'])._query)
-        self.assertEqual(len(BlogPost.objects(title=data['title'])), 1)
-
-        self.assertTrue('postComments.commentContent' in 
-                        BlogPost.objects(comments__content='test')._query)
-        self.assertEqual(len(BlogPost.objects(comments__content='test')), 1)
-
-        BlogPost.drop_collection()
-
-    def test_query_value_conversion(self):
-        """Ensure that query values are properly converted when necessary.
-        """
-        class BlogPost(Document):
-            author = ReferenceField(self.Person)
-
-        BlogPost.drop_collection()
-
-        person = self.Person(name='test', age=30)
-        person.save()
-
-        post = BlogPost(author=person)
-        post.save()
-
-        # Test that query may be performed by providing a document as a value
-        # while using a ReferenceField's name - the document should be 
-        # converted to an DBRef, which is legal, unlike a Document object
-        post_obj = BlogPost.objects(author=person).first()
-        self.assertEqual(post.id, post_obj.id)
-
-        # Test that lists of values work when using the 'in', 'nin' and 'all'
-        post_obj = BlogPost.objects(author__in=[person]).first()
-        self.assertEqual(post.id, post_obj.id)
-
-        BlogPost.drop_collection()
-
-
-    def test_types_index(self):
-        """Ensure that and index is used when '_types' is being used in a
-        query.
-        """
-        class BlogPost(Document):
-            date = DateTimeField()
-            meta = {'indexes': ['-date']}
-
-        # Indexes are lazy so use list() to perform query
-        list(BlogPost.objects)
-        info = BlogPost.objects._collection.index_information()
-        self.assertTrue([('_types', 1)] in info.values())
-        self.assertTrue([('_types', 1), ('date', -1)] in info.values())
-
-        BlogPost.drop_collection()
-
-        class BlogPost(Document):
-            title = StringField()
-            meta = {'allow_inheritance': False}
-
-        # _types is not used on objects where allow_inheritance is False
-        list(BlogPost.objects)
-        info = BlogPost.objects._collection.index_information()
-        self.assertFalse([('_types', 1)] in info.values())
-
-        BlogPost.drop_collection()
-
-    def tearDown(self):
-        self.Person.drop_collection()
-
-
-class QTest(unittest.TestCase):
-    
-    def test_or_and(self):
-        q1 = Q(name='test')
-        q2 = Q(age__gte=18)
-
-        query = ['(', {'name': 'test'}, '||', {'age__gte': 18}, ')']
-        self.assertEqual((q1 | q2).query, query)
-
-        query = ['(', {'name': 'test'}, '&&', {'age__gte': 18}, ')']
-        self.assertEqual((q1 & q2).query, query)
-
-        query = ['(', '(', {'name': 'test'}, '&&', {'age__gte': 18}, ')', '||',
-                 {'name': 'example'}, ')']
-        self.assertEqual((q1 & q2 | Q(name='example')).query, query)
-
-    def test_item_query_as_js(self):
-        """Ensure that the _item_query_as_js utilitiy method works properly.
-        """
-        q = Q()
-        examples = [
-            ({'name': 'test'}, 'this.name == i0f0', {'i0f0': 'test'}),
-            ({'age': {'$gt': 18}}, 'this.age > i0f0o0', {'i0f0o0': 18}),
-            ({'name': 'test', 'age': {'$gt': 18, '$lte': 65}}, 
-             'this.age <= i0f0o0 && this.age > i0f0o1 && this.name == i0f1', 
-             {'i0f0o0': 65, 'i0f0o1': 18, 'i0f1': 'test'}),
-        ]
-        for item, js, scope in examples:
-            test_scope = {}
-            self.assertEqual(q._item_query_as_js(item, test_scope, 0), js)
-            self.assertEqual(scope, test_scope)
-
-if __name__ == '__main__':
-    unittest.main()

tests/queryset/__init__.py

@@ -0,0 +1,5 @@
+from transform import *
+from field_list import *
+from queryset import *
+from visitor import *
+from geo import *

tests/queryset/field_list.py

@@ -0,0 +1,426 @@
+import sys
+sys.path[0:0] = [""]
+
+import unittest
+
+from mongoengine import *
+from mongoengine.queryset import QueryFieldList
+
+__all__ = ("QueryFieldListTest", "OnlyExcludeAllTest")
+
+
+class QueryFieldListTest(unittest.TestCase):
+
+    def test_empty(self):
+        q = QueryFieldList()
+        self.assertFalse(q)
+
+        q = QueryFieldList(always_include=['_cls'])
+        self.assertFalse(q)
+
+    def test_include_include(self):
+        q = QueryFieldList()
+        q += QueryFieldList(fields=['a', 'b'], value=QueryFieldList.ONLY, _only_called=True)
+        self.assertEqual(q.as_dict(), {'a': 1, 'b': 1})
+        q += QueryFieldList(fields=['b', 'c'], value=QueryFieldList.ONLY)
+        self.assertEqual(q.as_dict(), {'a': 1, 'b': 1, 'c': 1})
+
+    def test_include_exclude(self):
+        q = QueryFieldList()
+        q += QueryFieldList(fields=['a', 'b'], value=QueryFieldList.ONLY)
+        self.assertEqual(q.as_dict(), {'a': 1, 'b': 1})
+        q += QueryFieldList(fields=['b', 'c'], value=QueryFieldList.EXCLUDE)
+        self.assertEqual(q.as_dict(), {'a': 1})
+
+    def test_exclude_exclude(self):
+        q = QueryFieldList()
+        q += QueryFieldList(fields=['a', 'b'], value=QueryFieldList.EXCLUDE)
+        self.assertEqual(q.as_dict(), {'a': 0, 'b': 0})
+        q += QueryFieldList(fields=['b', 'c'], value=QueryFieldList.EXCLUDE)
+        self.assertEqual(q.as_dict(), {'a': 0, 'b': 0, 'c': 0})
+
+    def test_exclude_include(self):
+        q = QueryFieldList()
+        q += QueryFieldList(fields=['a', 'b'], value=QueryFieldList.EXCLUDE)
+        self.assertEqual(q.as_dict(), {'a': 0, 'b': 0})
+        q += QueryFieldList(fields=['b', 'c'], value=QueryFieldList.ONLY)
+        self.assertEqual(q.as_dict(), {'c': 1})
+
+    def test_always_include(self):
+        q = QueryFieldList(always_include=['x', 'y'])
+        q += QueryFieldList(fields=['a', 'b', 'x'], value=QueryFieldList.EXCLUDE)
+        q += QueryFieldList(fields=['b', 'c'], value=QueryFieldList.ONLY)
+        self.assertEqual(q.as_dict(), {'x': 1, 'y': 1, 'c': 1})
+
+    def test_reset(self):
+        q = QueryFieldList(always_include=['x', 'y'])
+        q += QueryFieldList(fields=['a', 'b', 'x'], value=QueryFieldList.EXCLUDE)
+        q += QueryFieldList(fields=['b', 'c'], value=QueryFieldList.ONLY)
+        self.assertEqual(q.as_dict(), {'x': 1, 'y': 1, 'c': 1})
+        q.reset()
+        self.assertFalse(q)
+        q += QueryFieldList(fields=['b', 'c'], value=QueryFieldList.ONLY)
+        self.assertEqual(q.as_dict(), {'x': 1, 'y': 1, 'b': 1, 'c': 1})
+
+    def test_using_a_slice(self):
+        q = QueryFieldList()
+        q += QueryFieldList(fields=['a'], value={"$slice": 5})
+        self.assertEqual(q.as_dict(), {'a': {"$slice": 5}})
+
+
+class OnlyExcludeAllTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+            meta = {'allow_inheritance': True}
+
+        Person.drop_collection()
+        self.Person = Person
+
+    def test_mixing_only_exclude(self):
+
+        class MyDoc(Document):
+            a = StringField()
+            b = StringField()
+            c = StringField()
+            d = StringField()
+            e = StringField()
+            f = StringField()
+
+        include = ['a', 'b', 'c', 'd', 'e']
+        exclude = ['d', 'e']
+        only = ['b', 'c']
+
+        qs = MyDoc.objects.fields(**dict(((i, 1) for i in include)))
+        self.assertEqual(qs._loaded_fields.as_dict(),
+                         {'a': 1, 'b': 1, 'c': 1, 'd': 1, 'e': 1})
+        qs = qs.only(*only)
+        self.assertEqual(qs._loaded_fields.as_dict(), {'b': 1, 'c': 1})
+        qs = qs.exclude(*exclude)
+        self.assertEqual(qs._loaded_fields.as_dict(), {'b': 1, 'c': 1})
+
+        qs = MyDoc.objects.fields(**dict(((i, 1) for i in include)))
+        qs = qs.exclude(*exclude)
+        self.assertEqual(qs._loaded_fields.as_dict(), {'a': 1, 'b': 1, 'c': 1})
+        qs = qs.only(*only)
+        self.assertEqual(qs._loaded_fields.as_dict(), {'b': 1, 'c': 1})
+
+        qs = MyDoc.objects.exclude(*exclude)
+        qs = qs.fields(**dict(((i, 1) for i in include)))
+        self.assertEqual(qs._loaded_fields.as_dict(), {'a': 1, 'b': 1, 'c': 1})
+        qs = qs.only(*only)
+        self.assertEqual(qs._loaded_fields.as_dict(), {'b': 1, 'c': 1})
+
+    def test_slicing(self):
+
+        class MyDoc(Document):
+            a = ListField()
+            b = ListField()
+            c = ListField()
+            d = ListField()
+            e = ListField()
+            f = ListField()
+
+        include = ['a', 'b', 'c', 'd', 'e']
+        exclude = ['d', 'e']
+        only = ['b', 'c']
+
+        qs = MyDoc.objects.fields(**dict(((i, 1) for i in include)))
+        qs = qs.exclude(*exclude)
+        qs = qs.only(*only)
+        qs = qs.fields(slice__b=5)
+        self.assertEqual(qs._loaded_fields.as_dict(),
+                         {'b': {'$slice': 5}, 'c': 1})
+
+        qs = qs.fields(slice__c=[5, 1])
+        self.assertEqual(qs._loaded_fields.as_dict(),
+                         {'b': {'$slice': 5}, 'c': {'$slice': [5, 1]}})
+
+        qs = qs.exclude('c')
+        self.assertEqual(qs._loaded_fields.as_dict(),
+                         {'b': {'$slice': 5}})
+
+    def test_only(self):
+        """Ensure that QuerySet.only only returns the requested fields.
+        """
+        person = self.Person(name='test', age=25)
+        person.save()
+
+        obj = self.Person.objects.only('name').get()
+        self.assertEqual(obj.name, person.name)
+        self.assertEqual(obj.age, None)
+
+        obj = self.Person.objects.only('age').get()
+        self.assertEqual(obj.name, None)
+        self.assertEqual(obj.age, person.age)
+
+        obj = self.Person.objects.only('name', 'age').get()
+        self.assertEqual(obj.name, person.name)
+        self.assertEqual(obj.age, person.age)
+
+        obj = self.Person.objects.only(*('id', 'name',)).get()
+        self.assertEqual(obj.name, person.name)
+        self.assertEqual(obj.age, None)
+
+        # Check polymorphism still works
+        class Employee(self.Person):
+            salary = IntField(db_field='wage')
+
+        employee = Employee(name='test employee', age=40, salary=30000)
+        employee.save()
+
+        obj = self.Person.objects(id=employee.id).only('age').get()
+        self.assertTrue(isinstance(obj, Employee))
+
+        # Check field names are looked up properly
+        obj = Employee.objects(id=employee.id).only('salary').get()
+        self.assertEqual(obj.salary, employee.salary)
+        self.assertEqual(obj.name, None)
+
+    def test_only_with_subfields(self):
+        class User(EmbeddedDocument):
+            name = StringField()
+            email = StringField()
+
+        class Comment(EmbeddedDocument):
+            title = StringField()
+            text = StringField()
+
+        class BlogPost(Document):
+            content = StringField()
+            author = EmbeddedDocumentField(User)
+            comments = ListField(EmbeddedDocumentField(Comment))
+
+        BlogPost.drop_collection()
+
+        post = BlogPost(content='Had a good coffee today...')
+        post.author = User(name='Test User')
+        post.comments = [Comment(title='I aggree', text='Great post!'), Comment(title='Coffee', text='I hate coffee')]
+        post.save()
+
+        obj = BlogPost.objects.only('author.name',).get()
+        self.assertEqual(obj.content, None)
+        self.assertEqual(obj.author.email, None)
+        self.assertEqual(obj.author.name, 'Test User')
+        self.assertEqual(obj.comments, [])
+
+        obj = BlogPost.objects.only('content', 'comments.title',).get()
+        self.assertEqual(obj.content, 'Had a good coffee today...')
+        self.assertEqual(obj.author, None)
+        self.assertEqual(obj.comments[0].title, 'I aggree')
+        self.assertEqual(obj.comments[1].title, 'Coffee')
+        self.assertEqual(obj.comments[0].text, None)
+        self.assertEqual(obj.comments[1].text, None)
+
+        obj = BlogPost.objects.only('comments',).get()
+        self.assertEqual(obj.content, None)
+        self.assertEqual(obj.author, None)
+        self.assertEqual(obj.comments[0].title, 'I aggree')
+        self.assertEqual(obj.comments[1].title, 'Coffee')
+        self.assertEqual(obj.comments[0].text, 'Great post!')
+        self.assertEqual(obj.comments[1].text, 'I hate coffee')
+
+        BlogPost.drop_collection()
+
+    def test_exclude(self):
+        class User(EmbeddedDocument):
+            name = StringField()
+            email = StringField()
+
+        class Comment(EmbeddedDocument):
+            title = StringField()
+            text = StringField()
+
+        class BlogPost(Document):
+            content = StringField()
+            author = EmbeddedDocumentField(User)
+            comments = ListField(EmbeddedDocumentField(Comment))
+
+        BlogPost.drop_collection()
+
+        post = BlogPost(content='Had a good coffee today...')
+        post.author = User(name='Test User')
+        post.comments = [Comment(title='I aggree', text='Great post!'), Comment(title='Coffee', text='I hate coffee')]
+        post.save()
+
+        obj = BlogPost.objects.exclude('author', 'comments.text').get()
+        self.assertEqual(obj.author, None)
+        self.assertEqual(obj.content, 'Had a good coffee today...')
+        self.assertEqual(obj.comments[0].title, 'I aggree')
+        self.assertEqual(obj.comments[0].text, None)
+
+        BlogPost.drop_collection()
+
+    def test_exclude_only_combining(self):
+        class Attachment(EmbeddedDocument):
+            name = StringField()
+            content = StringField()
+
+        class Email(Document):
+            sender = StringField()
+            to = StringField()
+            subject = StringField()
+            body = StringField()
+            content_type = StringField()
+            attachments = ListField(EmbeddedDocumentField(Attachment))
+
+        Email.drop_collection()
+        email = Email(sender='me', to='you', subject='From Russia with Love', body='Hello!', content_type='text/plain')
+        email.attachments = [
+            Attachment(name='file1.doc', content='ABC'),
+            Attachment(name='file2.doc', content='XYZ'),
+        ]
+        email.save()
+
+        obj = Email.objects.exclude('content_type').exclude('body').get()
+        self.assertEqual(obj.sender, 'me')
+        self.assertEqual(obj.to, 'you')
+        self.assertEqual(obj.subject, 'From Russia with Love')
+        self.assertEqual(obj.body, None)
+        self.assertEqual(obj.content_type, None)
+
+        obj = Email.objects.only('sender', 'to').exclude('body', 'sender').get()
+        self.assertEqual(obj.sender, None)
+        self.assertEqual(obj.to, 'you')
+        self.assertEqual(obj.subject, None)
+        self.assertEqual(obj.body, None)
+        self.assertEqual(obj.content_type, None)
+
+        obj = Email.objects.exclude('attachments.content').exclude('body').only('to', 'attachments.name').get()
+        self.assertEqual(obj.attachments[0].name, 'file1.doc')
+        self.assertEqual(obj.attachments[0].content, None)
+        self.assertEqual(obj.sender, None)
+        self.assertEqual(obj.to, 'you')
+        self.assertEqual(obj.subject, None)
+        self.assertEqual(obj.body, None)
+        self.assertEqual(obj.content_type, None)
+
+        Email.drop_collection()
+
+    def test_all_fields(self):
+
+        class Email(Document):
+            sender = StringField()
+            to = StringField()
+            subject = StringField()
+            body = StringField()
+            content_type = StringField()
+
+        Email.drop_collection()
+
+        email = Email(sender='me', to='you', subject='From Russia with Love', body='Hello!', content_type='text/plain')
+        email.save()
+
+        obj = Email.objects.exclude('content_type', 'body').only('to', 'body').all_fields().get()
+        self.assertEqual(obj.sender, 'me')
+        self.assertEqual(obj.to, 'you')
+        self.assertEqual(obj.subject, 'From Russia with Love')
+        self.assertEqual(obj.body, 'Hello!')
+        self.assertEqual(obj.content_type, 'text/plain')
+
+        Email.drop_collection()
+
+    def test_slicing_fields(self):
+        """Ensure that query slicing an array works.
+        """
+        class Numbers(Document):
+            n = ListField(IntField())
+
+        Numbers.drop_collection()
+
+        numbers = Numbers(n=[0, 1, 2, 3, 4, 5, -5, -4, -3, -2, -1])
+        numbers.save()
+
+        # first three
+        numbers = Numbers.objects.fields(slice__n=3).get()
+        self.assertEqual(numbers.n, [0, 1, 2])
+
+        # last three
+        numbers = Numbers.objects.fields(slice__n=-3).get()
+        self.assertEqual(numbers.n, [-3, -2, -1])
+
+        # skip 2, limit 3
+        numbers = Numbers.objects.fields(slice__n=[2, 3]).get()
+        self.assertEqual(numbers.n, [2, 3, 4])
+
+        # skip to fifth from last, limit 4
+        numbers = Numbers.objects.fields(slice__n=[-5, 4]).get()
+        self.assertEqual(numbers.n, [-5, -4, -3, -2])
+
+        # skip to fifth from last, limit 10
+        numbers = Numbers.objects.fields(slice__n=[-5, 10]).get()
+        self.assertEqual(numbers.n, [-5, -4, -3, -2, -1])
+
+        # skip to fifth from last, limit 10 dict method
+        numbers = Numbers.objects.fields(n={"$slice": [-5, 10]}).get()
+        self.assertEqual(numbers.n, [-5, -4, -3, -2, -1])
+
+    def test_slicing_nested_fields(self):
+        """Ensure that query slicing an embedded array works.
+        """
+
+        class EmbeddedNumber(EmbeddedDocument):
+            n = ListField(IntField())
+
+        class Numbers(Document):
+            embedded = EmbeddedDocumentField(EmbeddedNumber)
+
+        Numbers.drop_collection()
+
+        numbers = Numbers()
+        numbers.embedded = EmbeddedNumber(n=[0, 1, 2, 3, 4, 5, -5, -4, -3, -2, -1])
+        numbers.save()
+
+        # first three
+        numbers = Numbers.objects.fields(slice__embedded__n=3).get()
+        self.assertEqual(numbers.embedded.n, [0, 1, 2])
+
+        # last three
+        numbers = Numbers.objects.fields(slice__embedded__n=-3).get()
+        self.assertEqual(numbers.embedded.n, [-3, -2, -1])
+
+        # skip 2, limit 3
+        numbers = Numbers.objects.fields(slice__embedded__n=[2, 3]).get()
+        self.assertEqual(numbers.embedded.n, [2, 3, 4])
+
+        # skip to fifth from last, limit 4
+        numbers = Numbers.objects.fields(slice__embedded__n=[-5, 4]).get()
+        self.assertEqual(numbers.embedded.n, [-5, -4, -3, -2])
+
+        # skip to fifth from last, limit 10
+        numbers = Numbers.objects.fields(slice__embedded__n=[-5, 10]).get()
+        self.assertEqual(numbers.embedded.n, [-5, -4, -3, -2, -1])
+
+        # skip to fifth from last, limit 10 dict method
+        numbers = Numbers.objects.fields(embedded__n={"$slice": [-5, 10]}).get()
+        self.assertEqual(numbers.embedded.n, [-5, -4, -3, -2, -1])
+
+
+    def test_exclude_from_subclasses_docs(self):
+
+        class Base(Document):
+            username = StringField()
+
+            meta = {'allow_inheritance': True}
+
+        class Anon(Base):
+            anon = BooleanField()
+
+        class User(Base):
+            password = StringField()
+            wibble = StringField()
+
+        Base.drop_collection()
+        User(username="mongodb", password="secret").save()
+
+        user = Base.objects().exclude("password", "wibble").first()
+        self.assertEqual(user.password, None)
+
+        self.assertRaises(LookUpError, Base.objects.exclude, "made_up")
+
+if __name__ == '__main__':
+    unittest.main()

tests/queryset/geo.py

@@ -0,0 +1,418 @@
+import sys
+sys.path[0:0] = [""]
+
+import unittest
+from datetime import datetime, timedelta
+from mongoengine import *
+
+__all__ = ("GeoQueriesTest",)
+
+
+class GeoQueriesTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+
+    def test_geospatial_operators(self):
+        """Ensure that geospatial queries are working.
+        """
+        class Event(Document):
+            title = StringField()
+            date = DateTimeField()
+            location = GeoPointField()
+
+            def __unicode__(self):
+                return self.title
+
+        Event.drop_collection()
+
+        event1 = Event(title="Coltrane Motion @ Double Door",
+                       date=datetime.now() - timedelta(days=1),
+                       location=[-87.677137, 41.909889]).save()
+        event2 = Event(title="Coltrane Motion @ Bottom of the Hill",
+                       date=datetime.now() - timedelta(days=10),
+                       location=[-122.4194155, 37.7749295]).save()
+        event3 = Event(title="Coltrane Motion @ Empty Bottle",
+                       date=datetime.now(),
+                       location=[-87.686638, 41.900474]).save()
+
+        # find all events "near" pitchfork office, chicago.
+        # note that "near" will show the san francisco event, too,
+        # although it sorts to last.
+        events = Event.objects(location__near=[-87.67892, 41.9120459])
+        self.assertEqual(events.count(), 3)
+        self.assertEqual(list(events), [event1, event3, event2])
+
+        # find events within 5 degrees of pitchfork office, chicago
+        point_and_distance = [[-87.67892, 41.9120459], 5]
+        events = Event.objects(location__within_distance=point_and_distance)
+        self.assertEqual(events.count(), 2)
+        events = list(events)
+        self.assertTrue(event2 not in events)
+        self.assertTrue(event1 in events)
+        self.assertTrue(event3 in events)
+
+        # ensure ordering is respected by "near"
+        events = Event.objects(location__near=[-87.67892, 41.9120459])
+        events = events.order_by("-date")
+        self.assertEqual(events.count(), 3)
+        self.assertEqual(list(events), [event3, event1, event2])
+
+        # find events within 10 degrees of san francisco
+        point = [-122.415579, 37.7566023]
+        events = Event.objects(location__near=point, location__max_distance=10)
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0], event2)
+
+        # find events within 10 degrees of san francisco
+        point_and_distance = [[-122.415579, 37.7566023], 10]
+        events = Event.objects(location__within_distance=point_and_distance)
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0], event2)
+
+        # find events within 1 degree of greenpoint, broolyn, nyc, ny
+        point_and_distance = [[-73.9509714, 40.7237134], 1]
+        events = Event.objects(location__within_distance=point_and_distance)
+        self.assertEqual(events.count(), 0)
+
+        # ensure ordering is respected by "within_distance"
+        point_and_distance = [[-87.67892, 41.9120459], 10]
+        events = Event.objects(location__within_distance=point_and_distance)
+        events = events.order_by("-date")
+        self.assertEqual(events.count(), 2)
+        self.assertEqual(events[0], event3)
+
+        # check that within_box works
+        box = [(-125.0, 35.0), (-100.0, 40.0)]
+        events = Event.objects(location__within_box=box)
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0].id, event2.id)
+
+        polygon = [
+            (-87.694445, 41.912114),
+            (-87.69084, 41.919395),
+            (-87.681742, 41.927186),
+            (-87.654276, 41.911731),
+            (-87.656164, 41.898061),
+        ]
+        events = Event.objects(location__within_polygon=polygon)
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0].id, event1.id)
+
+        polygon2 = [
+            (-1.742249, 54.033586),
+            (-1.225891, 52.792797),
+            (-4.40094, 53.389881)
+        ]
+        events = Event.objects(location__within_polygon=polygon2)
+        self.assertEqual(events.count(), 0)
+
+    def test_geo_spatial_embedded(self):
+
+        class Venue(EmbeddedDocument):
+            location = GeoPointField()
+            name = StringField()
+
+        class Event(Document):
+            title = StringField()
+            venue = EmbeddedDocumentField(Venue)
+
+        Event.drop_collection()
+
+        venue1 = Venue(name="The Rock", location=[-87.677137, 41.909889])
+        venue2 = Venue(name="The Bridge", location=[-122.4194155, 37.7749295])
+
+        event1 = Event(title="Coltrane Motion @ Double Door",
+                       venue=venue1).save()
+        event2 = Event(title="Coltrane Motion @ Bottom of the Hill",
+                       venue=venue2).save()
+        event3 = Event(title="Coltrane Motion @ Empty Bottle",
+                       venue=venue1).save()
+
+        # find all events "near" pitchfork office, chicago.
+        # note that "near" will show the san francisco event, too,
+        # although it sorts to last.
+        events = Event.objects(venue__location__near=[-87.67892, 41.9120459])
+        self.assertEqual(events.count(), 3)
+        self.assertEqual(list(events), [event1, event3, event2])
+
+    def test_spherical_geospatial_operators(self):
+        """Ensure that spherical geospatial queries are working
+        """
+        class Point(Document):
+            location = GeoPointField()
+
+        Point.drop_collection()
+
+        # These points are one degree apart, which (according to Google Maps)
+        # is about 110 km apart at this place on the Earth.
+        north_point = Point(location=[-122, 38]).save()  # Near Concord, CA
+        south_point = Point(location=[-122, 37]).save()  # Near Santa Cruz, CA
+
+        earth_radius = 6378.009  # in km (needs to be a float for dividing by)
+
+        # Finds both points because they are within 60 km of the reference
+        # point equidistant between them.
+        points = Point.objects(location__near_sphere=[-122, 37.5])
+        self.assertEqual(points.count(), 2)
+
+        # Same behavior for _within_spherical_distance
+        points = Point.objects(
+            location__within_spherical_distance=[[-122, 37.5], 60/earth_radius]
+        )
+        self.assertEqual(points.count(), 2)
+
+        points = Point.objects(location__near_sphere=[-122, 37.5],
+                               location__max_distance=60 / earth_radius)
+        self.assertEqual(points.count(), 2)
+
+        # Finds both points, but orders the north point first because it's
+        # closer to the reference point to the north.
+        points = Point.objects(location__near_sphere=[-122, 38.5])
+        self.assertEqual(points.count(), 2)
+        self.assertEqual(points[0].id, north_point.id)
+        self.assertEqual(points[1].id, south_point.id)
+
+        # Finds both points, but orders the south point first because it's
+        # closer to the reference point to the south.
+        points = Point.objects(location__near_sphere=[-122, 36.5])
+        self.assertEqual(points.count(), 2)
+        self.assertEqual(points[0].id, south_point.id)
+        self.assertEqual(points[1].id, north_point.id)
+
+        # Finds only one point because only the first point is within 60km of
+        # the reference point to the south.
+        points = Point.objects(
+            location__within_spherical_distance=[[-122, 36.5], 60/earth_radius])
+        self.assertEqual(points.count(), 1)
+        self.assertEqual(points[0].id, south_point.id)
+
+    def test_2dsphere_point(self):
+
+        class Event(Document):
+            title = StringField()
+            date = DateTimeField()
+            location = PointField()
+
+            def __unicode__(self):
+                return self.title
+
+        Event.drop_collection()
+
+        event1 = Event(title="Coltrane Motion @ Double Door",
+                       date=datetime.now() - timedelta(days=1),
+                       location=[-87.677137, 41.909889])
+        event1.save()
+        event2 = Event(title="Coltrane Motion @ Bottom of the Hill",
+                       date=datetime.now() - timedelta(days=10),
+                       location=[-122.4194155, 37.7749295]).save()
+        event3 = Event(title="Coltrane Motion @ Empty Bottle",
+                       date=datetime.now(),
+                       location=[-87.686638, 41.900474]).save()
+
+        # find all events "near" pitchfork office, chicago.
+        # note that "near" will show the san francisco event, too,
+        # although it sorts to last.
+        events = Event.objects(location__near=[-87.67892, 41.9120459])
+        self.assertEqual(events.count(), 3)
+        self.assertEqual(list(events), [event1, event3, event2])
+
+        # find events within 5 degrees of pitchfork office, chicago
+        point_and_distance = [[-87.67892, 41.9120459], 2]
+        events = Event.objects(location__geo_within_center=point_and_distance)
+        self.assertEqual(events.count(), 2)
+        events = list(events)
+        self.assertTrue(event2 not in events)
+        self.assertTrue(event1 in events)
+        self.assertTrue(event3 in events)
+
+        # ensure ordering is respected by "near"
+        events = Event.objects(location__near=[-87.67892, 41.9120459])
+        events = events.order_by("-date")
+        self.assertEqual(events.count(), 3)
+        self.assertEqual(list(events), [event3, event1, event2])
+
+        # find events within 10km of san francisco
+        point = [-122.415579, 37.7566023]
+        events = Event.objects(location__near=point, location__max_distance=10000)
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0], event2)
+
+        # find events within 1km of greenpoint, broolyn, nyc, ny
+        events = Event.objects(location__near=[-73.9509714, 40.7237134], location__max_distance=1000)
+        self.assertEqual(events.count(), 0)
+
+        # ensure ordering is respected by "near"
+        events = Event.objects(location__near=[-87.67892, 41.9120459],
+                               location__max_distance=10000).order_by("-date")
+        self.assertEqual(events.count(), 2)
+        self.assertEqual(events[0], event3)
+
+        # check that within_box works
+        box = [(-125.0, 35.0), (-100.0, 40.0)]
+        events = Event.objects(location__geo_within_box=box)
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0].id, event2.id)
+
+        polygon = [
+            (-87.694445, 41.912114),
+            (-87.69084, 41.919395),
+            (-87.681742, 41.927186),
+            (-87.654276, 41.911731),
+            (-87.656164, 41.898061),
+        ]
+        events = Event.objects(location__geo_within_polygon=polygon)
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0].id, event1.id)
+
+        polygon2 = [
+            (-1.742249, 54.033586),
+            (-1.225891, 52.792797),
+            (-4.40094, 53.389881)
+        ]
+        events = Event.objects(location__geo_within_polygon=polygon2)
+        self.assertEqual(events.count(), 0)
+
+    def test_2dsphere_point_embedded(self):
+
+        class Venue(EmbeddedDocument):
+            location = GeoPointField()
+            name = StringField()
+
+        class Event(Document):
+            title = StringField()
+            venue = EmbeddedDocumentField(Venue)
+
+        Event.drop_collection()
+
+        venue1 = Venue(name="The Rock", location=[-87.677137, 41.909889])
+        venue2 = Venue(name="The Bridge", location=[-122.4194155, 37.7749295])
+
+        event1 = Event(title="Coltrane Motion @ Double Door",
+                       venue=venue1).save()
+        event2 = Event(title="Coltrane Motion @ Bottom of the Hill",
+                       venue=venue2).save()
+        event3 = Event(title="Coltrane Motion @ Empty Bottle",
+                       venue=venue1).save()
+
+        # find all events "near" pitchfork office, chicago.
+        # note that "near" will show the san francisco event, too,
+        # although it sorts to last.
+        events = Event.objects(venue__location__near=[-87.67892, 41.9120459])
+        self.assertEqual(events.count(), 3)
+        self.assertEqual(list(events), [event1, event3, event2])
+
+    def test_linestring(self):
+
+        class Road(Document):
+            name = StringField()
+            line = LineStringField()
+
+        Road.drop_collection()
+
+        Road(name="66", line=[[40, 5], [41, 6]]).save()
+
+        # near
+        point = {"type": "Point", "coordinates": [40, 5]}
+        roads = Road.objects.filter(line__near=point["coordinates"]).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(line__near=point).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(line__near={"$geometry": point}).count()
+        self.assertEqual(1, roads)
+
+        # Within
+        polygon = {"type": "Polygon",
+                   "coordinates": [[[40, 5], [40, 6], [41, 6], [41, 5], [40, 5]]]}
+        roads = Road.objects.filter(line__geo_within=polygon["coordinates"]).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(line__geo_within=polygon).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(line__geo_within={"$geometry": polygon}).count()
+        self.assertEqual(1, roads)
+
+        # Intersects
+        line = {"type": "LineString",
+                "coordinates": [[40, 5], [40, 6]]}
+        roads = Road.objects.filter(line__geo_intersects=line["coordinates"]).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(line__geo_intersects=line).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(line__geo_intersects={"$geometry": line}).count()
+        self.assertEqual(1, roads)
+
+        polygon = {"type": "Polygon",
+                   "coordinates": [[[40, 5], [40, 6], [41, 6], [41, 5], [40, 5]]]}
+        roads = Road.objects.filter(line__geo_intersects=polygon["coordinates"]).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(line__geo_intersects=polygon).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(line__geo_intersects={"$geometry": polygon}).count()
+        self.assertEqual(1, roads)
+
+    def test_polygon(self):
+
+        class Road(Document):
+            name = StringField()
+            poly = PolygonField()
+
+        Road.drop_collection()
+
+        Road(name="66", poly=[[[40, 5], [40, 6], [41, 6], [40, 5]]]).save()
+
+        # near
+        point = {"type": "Point", "coordinates": [40, 5]}
+        roads = Road.objects.filter(poly__near=point["coordinates"]).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(poly__near=point).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(poly__near={"$geometry": point}).count()
+        self.assertEqual(1, roads)
+
+        # Within
+        polygon = {"type": "Polygon",
+                   "coordinates": [[[40, 5], [40, 6], [41, 6], [41, 5], [40, 5]]]}
+        roads = Road.objects.filter(poly__geo_within=polygon["coordinates"]).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(poly__geo_within=polygon).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(poly__geo_within={"$geometry": polygon}).count()
+        self.assertEqual(1, roads)
+
+        # Intersects
+        line = {"type": "LineString",
+                "coordinates": [[40, 5], [41, 6]]}
+        roads = Road.objects.filter(poly__geo_intersects=line["coordinates"]).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(poly__geo_intersects=line).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(poly__geo_intersects={"$geometry": line}).count()
+        self.assertEqual(1, roads)
+
+        polygon = {"type": "Polygon",
+                   "coordinates": [[[40, 5], [40, 6], [41, 6], [41, 5], [40, 5]]]}
+        roads = Road.objects.filter(poly__geo_intersects=polygon["coordinates"]).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(poly__geo_intersects=polygon).count()
+        self.assertEqual(1, roads)
+
+        roads = Road.objects.filter(poly__geo_intersects={"$geometry": polygon}).count()
+        self.assertEqual(1, roads)
+
+if __name__ == '__main__':
+    unittest.main()

tests/queryset/transform.py

@@ -0,0 +1,172 @@
+import sys
+sys.path[0:0] = [""]
+
+import unittest
+
+from mongoengine import *
+from mongoengine.queryset import Q
+from mongoengine.queryset import transform
+
+__all__ = ("TransformTest",)
+
+
+class TransformTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+
+    def test_transform_query(self):
+        """Ensure that the _transform_query function operates correctly.
+        """
+        self.assertEqual(transform.query(name='test', age=30),
+                         {'name': 'test', 'age': 30})
+        self.assertEqual(transform.query(age__lt=30),
+                         {'age': {'$lt': 30}})
+        self.assertEqual(transform.query(age__gt=20, age__lt=50),
+                         {'age': {'$gt': 20, '$lt': 50}})
+        self.assertEqual(transform.query(age=20, age__gt=50),
+                         {'$and': [{'age': {'$gt': 50}}, {'age': 20}]})
+        self.assertEqual(transform.query(friend__age__gte=30),
+                         {'friend.age': {'$gte': 30}})
+        self.assertEqual(transform.query(name__exists=True),
+                         {'name': {'$exists': True}})
+
+    def test_transform_update(self):
+        class DicDoc(Document):
+            dictField = DictField()
+
+        class Doc(Document):
+            pass
+
+        DicDoc.drop_collection()
+        Doc.drop_collection()
+
+        doc = Doc().save()
+        dic_doc = DicDoc().save()
+
+        for k, v in (("set", "$set"), ("set_on_insert", "$setOnInsert"), ("push", "$push")):
+            update = transform.update(DicDoc, **{"%s__dictField__test" % k: doc})
+            self.assertTrue(isinstance(update[v]["dictField.test"], dict))
+
+        # Update special cases
+        update = transform.update(DicDoc, unset__dictField__test=doc)
+        self.assertEqual(update["$unset"]["dictField.test"], 1)
+
+        update = transform.update(DicDoc, pull__dictField__test=doc)
+        self.assertTrue(isinstance(update["$pull"]["dictField"]["test"], dict))
+
+
+    def test_query_field_name(self):
+        """Ensure that the correct field name is used when querying.
+        """
+        class Comment(EmbeddedDocument):
+            content = StringField(db_field='commentContent')
+
+        class BlogPost(Document):
+            title = StringField(db_field='postTitle')
+            comments = ListField(EmbeddedDocumentField(Comment),
+                                 db_field='postComments')
+
+        BlogPost.drop_collection()
+
+        data = {'title': 'Post 1', 'comments': [Comment(content='test')]}
+        post = BlogPost(**data)
+        post.save()
+
+        self.assertTrue('postTitle' in
+                        BlogPost.objects(title=data['title'])._query)
+        self.assertFalse('title' in
+                         BlogPost.objects(title=data['title'])._query)
+        self.assertEqual(BlogPost.objects(title=data['title']).count(), 1)
+
+        self.assertTrue('_id' in BlogPost.objects(pk=post.id)._query)
+        self.assertEqual(BlogPost.objects(pk=post.id).count(), 1)
+
+        self.assertTrue('postComments.commentContent' in
+                        BlogPost.objects(comments__content='test')._query)
+        self.assertEqual(BlogPost.objects(comments__content='test').count(), 1)
+
+        BlogPost.drop_collection()
+
+    def test_query_pk_field_name(self):
+        """Ensure that the correct "primary key" field name is used when
+        querying
+        """
+        class BlogPost(Document):
+            title = StringField(primary_key=True, db_field='postTitle')
+
+        BlogPost.drop_collection()
+
+        data = {'title': 'Post 1'}
+        post = BlogPost(**data)
+        post.save()
+
+        self.assertTrue('_id' in BlogPost.objects(pk=data['title'])._query)
+        self.assertTrue('_id' in BlogPost.objects(title=data['title'])._query)
+        self.assertEqual(BlogPost.objects(pk=data['title']).count(), 1)
+
+        BlogPost.drop_collection()
+
+    def test_chaining(self):
+        class A(Document):
+            pass
+
+        class B(Document):
+            a = ReferenceField(A)
+
+        A.drop_collection()
+        B.drop_collection()
+
+        a1 = A().save()
+        a2 = A().save()
+
+        B(a=a1).save()
+
+        # Works
+        q1 = B.objects.filter(a__in=[a1, a2], a=a1)._query
+
+        # Doesn't work
+        q2 = B.objects.filter(a__in=[a1, a2])
+        q2 = q2.filter(a=a1)._query
+
+        self.assertEqual(q1, q2)
+
+    def test_raw_query_and_Q_objects(self):
+        """
+        Test raw plays nicely
+        """
+        class Foo(Document):
+            name = StringField()
+            a = StringField()
+            b = StringField()
+            c = StringField()
+
+            meta = {
+                'allow_inheritance': False
+            }
+
+        query = Foo.objects(__raw__={'$nor': [{'name': 'bar'}]})._query
+        self.assertEqual(query, {'$nor': [{'name': 'bar'}]})
+
+        q1 = {'$or': [{'a': 1}, {'b': 1}]}
+        query = Foo.objects(Q(__raw__=q1) & Q(c=1))._query
+        self.assertEqual(query, {'$or': [{'a': 1}, {'b': 1}], 'c': 1})
+
+    def test_raw_and_merging(self):
+        class Doc(Document):
+            meta = {'allow_inheritance': False}
+
+        raw_query = Doc.objects(__raw__={'deleted': False,
+                                'scraped': 'yes',
+                                '$nor': [{'views.extracted': 'no'},
+                                         {'attachments.views.extracted':'no'}]
+                                })._query
+
+        expected = {'deleted': False, 'scraped': 'yes',
+                    '$nor': [{'views.extracted': 'no'},
+                             {'attachments.views.extracted': 'no'}]}
+        self.assertEqual(expected, raw_query)
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/queryset/visitor.py

@@ -0,0 +1,350 @@
+import sys
+sys.path[0:0] = [""]
+
+import unittest
+
+from bson import ObjectId
+from datetime import datetime
+
+from mongoengine import *
+from mongoengine.queryset import Q
+from mongoengine.errors import InvalidQueryError
+
+__all__ = ("QTest",)
+
+
+class QTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+            meta = {'allow_inheritance': True}
+
+        Person.drop_collection()
+        self.Person = Person
+
+    def test_empty_q(self):
+        """Ensure that empty Q objects won't hurt.
+        """
+        q1 = Q()
+        q2 = Q(age__gte=18)
+        q3 = Q()
+        q4 = Q(name='test')
+        q5 = Q()
+
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+        query = {'$or': [{'age': {'$gte': 18}}, {'name': 'test'}]}
+        self.assertEqual((q1 | q2 | q3 | q4 | q5).to_query(Person), query)
+
+        query = {'age': {'$gte': 18}, 'name': 'test'}
+        self.assertEqual((q1 & q2 & q3 & q4 & q5).to_query(Person), query)
+
+    def test_q_with_dbref(self):
+        """Ensure Q objects handle DBRefs correctly"""
+        connect(db='mongoenginetest')
+
+        class User(Document):
+            pass
+
+        class Post(Document):
+            created_user = ReferenceField(User)
+
+        user = User.objects.create()
+        Post.objects.create(created_user=user)
+
+        self.assertEqual(Post.objects.filter(created_user=user).count(), 1)
+        self.assertEqual(Post.objects.filter(Q(created_user=user)).count(), 1)
+
+    def test_and_combination(self):
+        """Ensure that Q-objects correctly AND together.
+        """
+        class TestDoc(Document):
+            x = IntField()
+            y = StringField()
+
+        query = (Q(x__lt=7) & Q(x__lt=3)).to_query(TestDoc)
+        self.assertEqual(query, {'$and': [{'x': {'$lt': 7}}, {'x': {'$lt': 3}}]})
+
+        query = (Q(y="a") & Q(x__lt=7) & Q(x__lt=3)).to_query(TestDoc)
+        self.assertEqual(query, {'$and': [{'y': "a"}, {'x': {'$lt': 7}}, {'x': {'$lt': 3}}]})
+
+        # Check normal cases work without an error
+        query = Q(x__lt=7) & Q(x__gt=3)
+
+        q1 = Q(x__lt=7)
+        q2 = Q(x__gt=3)
+        query = (q1 & q2).to_query(TestDoc)
+        self.assertEqual(query, {'x': {'$lt': 7, '$gt': 3}})
+
+        # More complex nested example
+        query = Q(x__lt=100) & Q(y__ne='NotMyString')
+        query &= Q(y__in=['a', 'b', 'c']) & Q(x__gt=-100)
+        mongo_query = {
+            'x': {'$lt': 100, '$gt': -100},
+            'y': {'$ne': 'NotMyString', '$in': ['a', 'b', 'c']},
+        }
+        self.assertEqual(query.to_query(TestDoc), mongo_query)
+
+    def test_or_combination(self):
+        """Ensure that Q-objects correctly OR together.
+        """
+        class TestDoc(Document):
+            x = IntField()
+
+        q1 = Q(x__lt=3)
+        q2 = Q(x__gt=7)
+        query = (q1 | q2).to_query(TestDoc)
+        self.assertEqual(query, {
+            '$or': [
+                {'x': {'$lt': 3}},
+                {'x': {'$gt': 7}},
+            ]
+        })
+
+    def test_and_or_combination(self):
+        """Ensure that Q-objects handle ANDing ORed components.
+        """
+        class TestDoc(Document):
+            x = IntField()
+            y = BooleanField()
+
+        TestDoc.drop_collection()
+
+        query = (Q(x__gt=0) | Q(x__exists=False))
+        query &= Q(x__lt=100)
+        self.assertEqual(query.to_query(TestDoc), {'$and': [
+            {'$or': [{'x': {'$gt': 0}},
+                     {'x': {'$exists': False}}]},
+            {'x': {'$lt': 100}}]
+        })
+
+        q1 = (Q(x__gt=0) | Q(x__exists=False))
+        q2 = (Q(x__lt=100) | Q(y=True))
+        query = (q1 & q2).to_query(TestDoc)
+
+        TestDoc(x=101).save()
+        TestDoc(x=10).save()
+        TestDoc(y=True).save()
+
+        self.assertEqual(query,
+        {'$and': [
+            {'$or': [{'x': {'$gt': 0}}, {'x': {'$exists': False}}]},
+            {'$or': [{'x': {'$lt': 100}}, {'y': True}]}
+        ]})
+
+        self.assertEqual(2, TestDoc.objects(q1 & q2).count())
+
+    def test_or_and_or_combination(self):
+        """Ensure that Q-objects handle ORing ANDed ORed components. :)
+        """
+        class TestDoc(Document):
+            x = IntField()
+            y = BooleanField()
+
+        TestDoc.drop_collection()
+        TestDoc(x=-1, y=True).save()
+        TestDoc(x=101, y=True).save()
+        TestDoc(x=99, y=False).save()
+        TestDoc(x=101, y=False).save()
+
+        q1 = (Q(x__gt=0) & (Q(y=True) | Q(y__exists=False)))
+        q2 = (Q(x__lt=100) & (Q(y=False) | Q(y__exists=False)))
+        query = (q1 | q2).to_query(TestDoc)
+
+        self.assertEqual(query,
+            {'$or': [
+                {'$and': [{'x': {'$gt': 0}},
+                          {'$or': [{'y': True}, {'y': {'$exists': False}}]}]},
+                {'$and': [{'x': {'$lt': 100}},
+                          {'$or': [{'y': False}, {'y': {'$exists': False}}]}]}
+            ]}
+        )
+
+        self.assertEqual(2, TestDoc.objects(q1 | q2).count())
+
+    def test_multiple_occurence_in_field(self):
+        class Test(Document):
+            name = StringField(max_length=40)
+            title = StringField(max_length=40)
+
+        q1 = Q(name__contains='te') | Q(title__contains='te')
+        q2 = Q(name__contains='12') | Q(title__contains='12')
+
+        q3 = q1 & q2
+
+        query = q3.to_query(Test)
+        self.assertEqual(query["$and"][0], q1.to_query(Test))
+        self.assertEqual(query["$and"][1], q2.to_query(Test))
+
+    def test_q_clone(self):
+
+        class TestDoc(Document):
+            x = IntField()
+
+        TestDoc.drop_collection()
+        for i in xrange(1, 101):
+            t = TestDoc(x=i)
+            t.save()
+
+        # Check normal cases work without an error
+        test = TestDoc.objects(Q(x__lt=7) & Q(x__gt=3))
+
+        self.assertEqual(test.count(), 3)
+
+        test2 = test.clone()
+        self.assertEqual(test2.count(), 3)
+        self.assertFalse(test2 == test)
+
+        test3 = test2.filter(x=6)
+        self.assertEqual(test3.count(), 1)
+        self.assertEqual(test.count(), 3)
+
+    def test_q(self):
+        """Ensure that Q objects may be used to query for documents.
+        """
+        class BlogPost(Document):
+            title = StringField()
+            publish_date = DateTimeField()
+            published = BooleanField()
+
+        BlogPost.drop_collection()
+
+        post1 = BlogPost(title='Test 1', publish_date=datetime(2010, 1, 8), published=False)
+        post1.save()
+
+        post2 = BlogPost(title='Test 2', publish_date=datetime(2010, 1, 15), published=True)
+        post2.save()
+
+        post3 = BlogPost(title='Test 3', published=True)
+        post3.save()
+
+        post4 = BlogPost(title='Test 4', publish_date=datetime(2010, 1, 8))
+        post4.save()
+
+        post5 = BlogPost(title='Test 1', publish_date=datetime(2010, 1, 15))
+        post5.save()
+
+        post6 = BlogPost(title='Test 1', published=False)
+        post6.save()
+
+        # Check ObjectId lookup works
+        obj = BlogPost.objects(id=post1.id).first()
+        self.assertEqual(obj, post1)
+
+        # Check Q object combination with one does not exist
+        q = BlogPost.objects(Q(title='Test 5') | Q(published=True))
+        posts = [post.id for post in q]
+
+        published_posts = (post2, post3)
+        self.assertTrue(all(obj.id in posts for obj in published_posts))
+
+        q = BlogPost.objects(Q(title='Test 1') | Q(published=True))
+        posts = [post.id for post in q]
+        published_posts = (post1, post2, post3, post5, post6)
+        self.assertTrue(all(obj.id in posts for obj in published_posts))
+
+        # Check Q object combination
+        date = datetime(2010, 1, 10)
+        q = BlogPost.objects(Q(publish_date__lte=date) | Q(published=True))
+        posts = [post.id for post in q]
+
+        published_posts = (post1, post2, post3, post4)
+        self.assertTrue(all(obj.id in posts for obj in published_posts))
+
+        self.assertFalse(any(obj.id in posts for obj in [post5, post6]))
+
+        BlogPost.drop_collection()
+
+        # Check the 'in' operator
+        self.Person(name='user1', age=20).save()
+        self.Person(name='user2', age=20).save()
+        self.Person(name='user3', age=30).save()
+        self.Person(name='user4', age=40).save()
+
+        self.assertEqual(self.Person.objects(Q(age__in=[20])).count(), 2)
+        self.assertEqual(self.Person.objects(Q(age__in=[20, 30])).count(), 3)
+
+        # Test invalid query objs
+        def wrong_query_objs():
+            self.Person.objects('user1')
+        def wrong_query_objs_filter():
+            self.Person.objects('user1')
+        self.assertRaises(InvalidQueryError, wrong_query_objs)
+        self.assertRaises(InvalidQueryError, wrong_query_objs_filter)
+
+    def test_q_regex(self):
+        """Ensure that Q objects can be queried using regexes.
+        """
+        person = self.Person(name='Guido van Rossum')
+        person.save()
+
+        import re
+        obj = self.Person.objects(Q(name=re.compile('^Gui'))).first()
+        self.assertEqual(obj, person)
+        obj = self.Person.objects(Q(name=re.compile('^gui'))).first()
+        self.assertEqual(obj, None)
+
+        obj = self.Person.objects(Q(name=re.compile('^gui', re.I))).first()
+        self.assertEqual(obj, person)
+
+        obj = self.Person.objects(Q(name__not=re.compile('^bob'))).first()
+        self.assertEqual(obj, person)
+
+        obj = self.Person.objects(Q(name__not=re.compile('^Gui'))).first()
+        self.assertEqual(obj, None)
+
+    def test_q_lists(self):
+        """Ensure that Q objects query ListFields correctly.
+        """
+        class BlogPost(Document):
+            tags = ListField(StringField())
+
+        BlogPost.drop_collection()
+
+        BlogPost(tags=['python', 'mongo']).save()
+        BlogPost(tags=['python']).save()
+
+        self.assertEqual(BlogPost.objects(Q(tags='mongo')).count(), 1)
+        self.assertEqual(BlogPost.objects(Q(tags='python')).count(), 2)
+
+        BlogPost.drop_collection()
+
+    def test_q_merge_queries_edge_case(self):
+
+        class User(Document):
+            email = EmailField(required=False)
+            name = StringField()
+
+        User.drop_collection()
+        pk = ObjectId()
+        User(email='example@example.com', pk=pk).save()
+
+        self.assertEqual(1, User.objects.filter(Q(email='example@example.com') |
+                                                Q(name='John Doe')).limit(2).filter(pk=pk).count())
+
+    def test_chained_q_or_filtering(self):
+
+        class Post(EmbeddedDocument):
+            name = StringField(required=True)
+
+        class Item(Document):
+            postables = ListField(EmbeddedDocumentField(Post))
+
+        Item.drop_collection()
+
+        Item(postables=[Post(name="a"), Post(name="b")]).save()
+        Item(postables=[Post(name="a"), Post(name="c")]).save()
+        Item(postables=[Post(name="a"), Post(name="b"), Post(name="c")]).save()
+
+        self.assertEqual(Item.objects(Q(postables__name="a") & Q(postables__name="b")).count(), 2)
+        self.assertEqual(Item.objects.filter(postables__name="a").filter(postables__name="b").count(), 2)
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/test_connection.py

@@ -0,0 +1,128 @@
+import sys
+sys.path[0:0] = [""]
+import unittest
+import datetime
+
+import pymongo
+from bson.tz_util import utc
+
+from mongoengine import *
+import mongoengine.connection
+from mongoengine.connection import get_db, get_connection, ConnectionError
+
+
+class ConnectionTest(unittest.TestCase):
+
+    def tearDown(self):
+        mongoengine.connection._connection_settings = {}
+        mongoengine.connection._connections = {}
+        mongoengine.connection._dbs = {}
+
+    def test_connect(self):
+        """Ensure that the connect() method works properly.
+        """
+        connect('mongoenginetest')
+
+        conn = get_connection()
+        self.assertTrue(isinstance(conn, pymongo.mongo_client.MongoClient))
+
+        db = get_db()
+        self.assertTrue(isinstance(db, pymongo.database.Database))
+        self.assertEqual(db.name, 'mongoenginetest')
+
+        connect('mongoenginetest2', alias='testdb')
+        conn = get_connection('testdb')
+        self.assertTrue(isinstance(conn, pymongo.mongo_client.MongoClient))
+
+    def test_connect_uri(self):
+        """Ensure that the connect() method works properly with uri's
+        """
+        c = connect(db='mongoenginetest', alias='admin')
+        c.admin.system.users.remove({})
+        c.mongoenginetest.system.users.remove({})
+
+        c.admin.add_user("admin", "password")
+        c.admin.authenticate("admin", "password")
+        c.mongoenginetest.add_user("username", "password")
+
+        self.assertRaises(ConnectionError, connect, "testdb_uri_bad", host='mongodb://test:password@localhost')
+
+        connect("testdb_uri", host='mongodb://username:password@localhost/mongoenginetest')
+
+        conn = get_connection()
+        self.assertTrue(isinstance(conn, pymongo.mongo_client.MongoClient))
+
+        db = get_db()
+        self.assertTrue(isinstance(db, pymongo.database.Database))
+        self.assertEqual(db.name, 'mongoenginetest')
+
+        c.admin.system.users.remove({})
+        c.mongoenginetest.system.users.remove({})
+
+    def test_connect_uri_without_db(self):
+        """Ensure that the connect() method works properly with uri's
+        without database_name
+        """
+        c = connect(db='mongoenginetest', alias='admin')
+        c.admin.system.users.remove({})
+        c.mongoenginetest.system.users.remove({})
+
+        c.admin.add_user("admin", "password")
+        c.admin.authenticate("admin", "password")
+        c.mongoenginetest.add_user("username", "password")
+
+        self.assertRaises(ConnectionError, connect, "testdb_uri_bad", host='mongodb://test:password@localhost')
+
+        connect("mongoenginetest", host='mongodb://localhost/')
+
+        conn = get_connection()
+        self.assertTrue(isinstance(conn, pymongo.mongo_client.MongoClient))
+
+        db = get_db()
+        self.assertTrue(isinstance(db, pymongo.database.Database))
+        self.assertEqual(db.name, 'mongoenginetest')
+
+        c.admin.system.users.remove({})
+        c.mongoenginetest.system.users.remove({})
+
+    def test_register_connection(self):
+        """Ensure that connections with different aliases may be registered.
+        """
+        register_connection('testdb', 'mongoenginetest2')
+
+        self.assertRaises(ConnectionError, get_connection)
+        conn = get_connection('testdb')
+        self.assertTrue(isinstance(conn, pymongo.mongo_client.MongoClient))
+
+        db = get_db('testdb')
+        self.assertTrue(isinstance(db, pymongo.database.Database))
+        self.assertEqual(db.name, 'mongoenginetest2')
+
+    def test_connection_kwargs(self):
+        """Ensure that connection kwargs get passed to pymongo.
+        """
+        connect('mongoenginetest', alias='t1', tz_aware=True)
+        conn = get_connection('t1')
+
+        self.assertTrue(conn.tz_aware)
+
+        connect('mongoenginetest2', alias='t2')
+        conn = get_connection('t2')
+        self.assertFalse(conn.tz_aware)
+
+    def test_datetime(self):
+        connect('mongoenginetest', tz_aware=True)
+        d = datetime.datetime(2010, 5, 5, tzinfo=utc)
+
+        class DateDoc(Document):
+            the_date = DateTimeField(required=True)
+
+        DateDoc.drop_collection()
+        DateDoc(the_date=d).save()
+
+        date_doc = DateDoc.objects.first()
+        self.assertEqual(d, date_doc.the_date)
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/test_context_managers.py

@@ -0,0 +1,204 @@
+import sys
+sys.path[0:0] = [""]
+import unittest
+
+from mongoengine import *
+from mongoengine.connection import get_db
+from mongoengine.context_managers import (switch_db, switch_collection,
+                                          no_sub_classes, no_dereference,
+                                          query_counter)
+
+
+class ContextManagersTest(unittest.TestCase):
+
+    def test_switch_db_context_manager(self):
+        connect('mongoenginetest')
+        register_connection('testdb-1', 'mongoenginetest2')
+
+        class Group(Document):
+            name = StringField()
+
+        Group.drop_collection()
+
+        Group(name="hello - default").save()
+        self.assertEqual(1, Group.objects.count())
+
+        with switch_db(Group, 'testdb-1') as Group:
+
+            self.assertEqual(0, Group.objects.count())
+
+            Group(name="hello").save()
+
+            self.assertEqual(1, Group.objects.count())
+
+            Group.drop_collection()
+            self.assertEqual(0, Group.objects.count())
+
+        self.assertEqual(1, Group.objects.count())
+
+    def test_switch_collection_context_manager(self):
+        connect('mongoenginetest')
+        register_connection('testdb-1', 'mongoenginetest2')
+
+        class Group(Document):
+            name = StringField()
+
+        Group.drop_collection()
+        with switch_collection(Group, 'group1') as Group:
+            Group.drop_collection()
+
+        Group(name="hello - group").save()
+        self.assertEqual(1, Group.objects.count())
+
+        with switch_collection(Group, 'group1') as Group:
+
+            self.assertEqual(0, Group.objects.count())
+
+            Group(name="hello - group1").save()
+
+            self.assertEqual(1, Group.objects.count())
+
+            Group.drop_collection()
+            self.assertEqual(0, Group.objects.count())
+
+        self.assertEqual(1, Group.objects.count())
+
+    def test_no_dereference_context_manager_object_id(self):
+        """Ensure that DBRef items in ListFields aren't dereferenced.
+        """
+        connect('mongoenginetest')
+
+        class User(Document):
+            name = StringField()
+
+        class Group(Document):
+            ref = ReferenceField(User, dbref=False)
+            generic = GenericReferenceField()
+            members = ListField(ReferenceField(User, dbref=False))
+
+        User.drop_collection()
+        Group.drop_collection()
+
+        for i in xrange(1, 51):
+            User(name='user %s' % i).save()
+
+        user = User.objects.first()
+        Group(ref=user, members=User.objects, generic=user).save()
+
+        with no_dereference(Group) as NoDeRefGroup:
+            self.assertTrue(Group._fields['members']._auto_dereference)
+            self.assertFalse(NoDeRefGroup._fields['members']._auto_dereference)
+
+        with no_dereference(Group) as Group:
+            group = Group.objects.first()
+            self.assertTrue(all([not isinstance(m, User)
+                                for m in group.members]))
+            self.assertFalse(isinstance(group.ref, User))
+            self.assertFalse(isinstance(group.generic, User))
+
+        self.assertTrue(all([isinstance(m, User)
+                             for m in group.members]))
+        self.assertTrue(isinstance(group.ref, User))
+        self.assertTrue(isinstance(group.generic, User))
+
+    def test_no_dereference_context_manager_dbref(self):
+        """Ensure that DBRef items in ListFields aren't dereferenced.
+        """
+        connect('mongoenginetest')
+
+        class User(Document):
+            name = StringField()
+
+        class Group(Document):
+            ref = ReferenceField(User, dbref=True)
+            generic = GenericReferenceField()
+            members = ListField(ReferenceField(User, dbref=True))
+
+        User.drop_collection()
+        Group.drop_collection()
+
+        for i in xrange(1, 51):
+            User(name='user %s' % i).save()
+
+        user = User.objects.first()
+        Group(ref=user, members=User.objects, generic=user).save()
+
+        with no_dereference(Group) as NoDeRefGroup:
+            self.assertTrue(Group._fields['members']._auto_dereference)
+            self.assertFalse(NoDeRefGroup._fields['members']._auto_dereference)
+
+        with no_dereference(Group) as Group:
+            group = Group.objects.first()
+            self.assertTrue(all([not isinstance(m, User)
+                                for m in group.members]))
+            self.assertFalse(isinstance(group.ref, User))
+            self.assertFalse(isinstance(group.generic, User))
+
+        self.assertTrue(all([isinstance(m, User)
+                             for m in group.members]))
+        self.assertTrue(isinstance(group.ref, User))
+        self.assertTrue(isinstance(group.generic, User))
+
+    def test_no_sub_classes(self):
+        class A(Document):
+            x = IntField()
+            y = IntField()
+
+            meta = {'allow_inheritance': True}
+
+        class B(A):
+            z = IntField()
+
+        class C(B):
+            zz = IntField()
+
+        A.drop_collection()
+
+        A(x=10, y=20).save()
+        A(x=15, y=30).save()
+        B(x=20, y=40).save()
+        B(x=30, y=50).save()
+        C(x=40, y=60).save()
+
+        self.assertEqual(A.objects.count(), 5)
+        self.assertEqual(B.objects.count(), 3)
+        self.assertEqual(C.objects.count(), 1)
+
+        with no_sub_classes(A) as A:
+            self.assertEqual(A.objects.count(), 2)
+
+            for obj in A.objects:
+                self.assertEqual(obj.__class__, A)
+
+        with no_sub_classes(B) as B:
+            self.assertEqual(B.objects.count(), 2)
+
+            for obj in B.objects:
+                self.assertEqual(obj.__class__, B)
+
+        with no_sub_classes(C) as C:
+            self.assertEqual(C.objects.count(), 1)
+
+            for obj in C.objects:
+                self.assertEqual(obj.__class__, C)
+
+        # Confirm context manager exit correctly
+        self.assertEqual(A.objects.count(), 5)
+        self.assertEqual(B.objects.count(), 3)
+        self.assertEqual(C.objects.count(), 1)
+
+    def test_query_counter(self):
+        connect('mongoenginetest')
+        db = get_db()
+        db.test.find({})
+
+        with query_counter() as q:
+            self.assertEqual(0, q)
+
+            for i in xrange(1, 51):
+                db.test.find({}).count()
+
+            self.assertEqual(50, q)
+
+if __name__ == '__main__':
+    unittest.main()

tests/test_django.py

@@ -0,0 +1,296 @@
+import sys
+sys.path[0:0] = [""]
+import unittest
+from nose.plugins.skip import SkipTest
+from mongoengine import *
+
+
+from mongoengine.django.shortcuts import get_document_or_404
+
+from django.http import Http404
+from django.template import Context, Template
+from django.conf import settings
+from django.core.paginator import Paginator
+
+settings.configure(
+    USE_TZ=True,
+    INSTALLED_APPS=('django.contrib.auth', 'mongoengine.django.mongo_auth'),
+    AUTH_USER_MODEL=('mongo_auth.MongoUser'),
+)
+
+try:
+    from django.contrib.auth import authenticate, get_user_model
+    from mongoengine.django.auth import User
+    from mongoengine.django.mongo_auth.models import (
+        MongoUser,
+        MongoUserManager,
+        get_user_document,
+    )
+    DJ15 = True
+except Exception:
+    DJ15 = False
+from django.contrib.sessions.tests import SessionTestsMixin
+from mongoengine.django.sessions import SessionStore, MongoSession
+from datetime import tzinfo, timedelta
+ZERO = timedelta(0)
+
+
+class FixedOffset(tzinfo):
+    """Fixed offset in minutes east from UTC."""
+
+    def __init__(self, offset, name):
+        self.__offset = timedelta(minutes=offset)
+        self.__name = name
+
+    def utcoffset(self, dt):
+        return self.__offset
+
+    def tzname(self, dt):
+        return self.__name
+
+    def dst(self, dt):
+        return ZERO
+
+
+def activate_timezone(tz):
+    """Activate Django timezone support if it is available.
+    """
+    try:
+        from django.utils import timezone
+        timezone.deactivate()
+        timezone.activate(tz)
+    except ImportError:
+        pass
+
+
+class QuerySetTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+        self.Person = Person
+
+    def test_order_by_in_django_template(self):
+        """Ensure that QuerySets are properly ordered in Django template.
+        """
+        self.Person.drop_collection()
+
+        self.Person(name="A", age=20).save()
+        self.Person(name="D", age=10).save()
+        self.Person(name="B", age=40).save()
+        self.Person(name="C", age=30).save()
+
+        t = Template("{% for o in ol %}{{ o.name }}-{{ o.age }}:{% endfor %}")
+
+        d = {"ol": self.Person.objects.order_by('-name')}
+        self.assertEqual(t.render(Context(d)), u'D-10:C-30:B-40:A-20:')
+        d = {"ol": self.Person.objects.order_by('+name')}
+        self.assertEqual(t.render(Context(d)), u'A-20:B-40:C-30:D-10:')
+        d = {"ol": self.Person.objects.order_by('-age')}
+        self.assertEqual(t.render(Context(d)), u'B-40:C-30:A-20:D-10:')
+        d = {"ol": self.Person.objects.order_by('+age')}
+        self.assertEqual(t.render(Context(d)), u'D-10:A-20:C-30:B-40:')
+
+        self.Person.drop_collection()
+
+    def test_q_object_filter_in_template(self):
+
+        self.Person.drop_collection()
+
+        self.Person(name="A", age=20).save()
+        self.Person(name="D", age=10).save()
+        self.Person(name="B", age=40).save()
+        self.Person(name="C", age=30).save()
+
+        t = Template("{% for o in ol %}{{ o.name }}-{{ o.age }}:{% endfor %}")
+
+        d = {"ol": self.Person.objects.filter(Q(age=10) | Q(name="C"))}
+        self.assertEqual(t.render(Context(d)), 'D-10:C-30:')
+
+        # Check double rendering doesn't throw an error
+        self.assertEqual(t.render(Context(d)), 'D-10:C-30:')
+
+    def test_get_document_or_404(self):
+        p = self.Person(name="G404")
+        p.save()
+
+        self.assertRaises(Http404, get_document_or_404, self.Person, pk='1234')
+        self.assertEqual(p, get_document_or_404(self.Person, pk=p.pk))
+
+    def test_pagination(self):
+        """Ensure that Pagination works as expected
+        """
+        class Page(Document):
+            name = StringField()
+
+        Page.drop_collection()
+
+        for i in xrange(1, 11):
+            Page(name=str(i)).save()
+
+        paginator = Paginator(Page.objects.all(), 2)
+
+        t = Template("{% for i in page.object_list  %}{{ i.name }}:{% endfor %}")
+        for p in paginator.page_range:
+            d = {"page": paginator.page(p)}
+            end = p * 2
+            start = end - 1
+            self.assertEqual(t.render(Context(d)), u'%d:%d:' % (start, end))
+
+    def test_nested_queryset_template_iterator(self):
+        # Try iterating the same queryset twice, nested, in a Django template.
+        names = ['A', 'B', 'C', 'D']
+
+        class CustomUser(Document):
+            name = StringField()
+
+            def __unicode__(self):
+                return self.name
+
+        CustomUser.drop_collection()
+
+        for name in names:
+            CustomUser(name=name).save()
+
+        users = CustomUser.objects.all().order_by('name')
+        template = Template("{% for user in users %}{{ user.name }}{% ifequal forloop.counter 2 %} {% for inner_user in users %}{{ inner_user.name }}{% endfor %} {% endifequal %}{% endfor %}")
+        rendered = template.render(Context({'users': users}))
+        self.assertEqual(rendered, 'AB ABCD CD')
+
+    def test_filter(self):
+        """Ensure that a queryset and filters work as expected
+        """
+
+        class Note(Document):
+            text = StringField()
+
+        Note.drop_collection()
+
+        for i in xrange(1, 101):
+            Note(name="Note: %s" % i).save()
+
+        # Check the count
+        self.assertEqual(Note.objects.count(), 100)
+
+        # Get the first 10 and confirm
+        notes = Note.objects[:10]
+        self.assertEqual(notes.count(), 10)
+
+        # Test djangos template filters
+        # self.assertEqual(length(notes), 10)
+        t = Template("{{ notes.count }}")
+        c = Context({"notes": notes})
+        self.assertEqual(t.render(c), "10")
+
+        # Test with skip
+        notes = Note.objects.skip(90)
+        self.assertEqual(notes.count(), 10)
+
+        # Test djangos template filters
+        self.assertEqual(notes.count(), 10)
+        t = Template("{{ notes.count }}")
+        c = Context({"notes": notes})
+        self.assertEqual(t.render(c), "10")
+
+        # Test with limit
+        notes = Note.objects.skip(90)
+        self.assertEqual(notes.count(), 10)
+
+        # Test djangos template filters
+        self.assertEqual(notes.count(), 10)
+        t = Template("{{ notes.count }}")
+        c = Context({"notes": notes})
+        self.assertEqual(t.render(c), "10")
+
+        # Test with skip and limit
+        notes = Note.objects.skip(10).limit(10)
+
+        # Test djangos template filters
+        self.assertEqual(notes.count(), 10)
+        t = Template("{{ notes.count }}")
+        c = Context({"notes": notes})
+        self.assertEqual(t.render(c), "10")
+
+
+class MongoDBSessionTest(SessionTestsMixin, unittest.TestCase):
+    backend = SessionStore
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        MongoSession.drop_collection()
+        super(MongoDBSessionTest, self).setUp()
+
+    def assertIn(self, first, second, msg=None):
+        self.assertTrue(first in second, msg)
+
+    def assertNotIn(self, first, second, msg=None):
+        self.assertFalse(first in second, msg)
+
+    def test_first_save(self):
+        session = SessionStore()
+        session['test'] = True
+        session.save()
+        self.assertTrue('test' in session)
+
+    def test_session_expiration_tz(self):
+        activate_timezone(FixedOffset(60, 'UTC+1'))
+        # create and save new session
+        session = SessionStore()
+        session.set_expiry(600)  # expire in 600 seconds
+        session['test_expire'] = True
+        session.save()
+        # reload session with key
+        key = session.session_key
+        session = SessionStore(key)
+        self.assertTrue('test_expire' in session, 'Session has expired before it is expected')
+
+
+class MongoAuthTest(unittest.TestCase):
+    user_data = {
+        'username': 'user',
+        'email': 'user@example.com',
+        'password': 'test',
+    }
+
+    def setUp(self):
+        if not DJ15:
+            raise SkipTest('mongo_auth requires Django 1.5')
+        connect(db='mongoenginetest')
+        User.drop_collection()
+        super(MongoAuthTest, self).setUp()
+
+    def test_get_user_model(self):
+        self.assertEqual(get_user_model(), MongoUser)
+
+    def test_get_user_document(self):
+        self.assertEqual(get_user_document(), User)
+
+    def test_user_manager(self):
+        manager = get_user_model()._default_manager
+        self.assertTrue(isinstance(manager, MongoUserManager))
+
+    def test_user_manager_exception(self):
+        manager = get_user_model()._default_manager
+        self.assertRaises(MongoUser.DoesNotExist, manager.get,
+                          username='not found')
+
+    def test_create_user(self):
+        manager = get_user_model()._default_manager
+        user = manager.create_user(**self.user_data)
+        self.assertTrue(isinstance(user, User))
+        db_user = User.objects.get(username='user')
+        self.assertEqual(user.id, db_user.id)
+
+    def test_authenticate(self):
+        get_user_model()._default_manager.create_user(**self.user_data)
+        user = authenticate(username='user', password='fail')
+        self.assertEqual(None, user)
+        user = authenticate(username='user', password='test')
+        db_user = User.objects.get(username='user')
+        self.assertEqual(user.id, db_user.id)
+
+if __name__ == '__main__':
+    unittest.main()

tests/test_jinja.py

@@ -0,0 +1,47 @@
+import sys
+sys.path[0:0] = [""]
+
+import unittest
+
+from mongoengine import *
+
+import jinja2
+
+
+class TemplateFilterTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+
+    def test_jinja2(self):
+        env = jinja2.Environment()
+
+        class TestData(Document):
+            title = StringField()
+            description = StringField()
+
+        TestData.drop_collection()
+
+        examples = [('A', '1'),
+                    ('B', '2'),
+                    ('C', '3')]
+
+        for title, description in examples:
+            TestData(title=title, description=description).save()
+
+        tmpl = """
+{%- for record in content -%}
+    {%- if loop.first -%}{ {%- endif -%}
+    "{{ record.title }}": "{{ record.description }}"
+    {%- if loop.last -%} }{%- else -%},{% endif -%}
+{%- endfor -%}
+"""
+        ctx = {'content': TestData.objects}
+        template = env.from_string(tmpl)
+        rendered = template.render(**ctx)
+
+        self.assertEqual('{"A": "1","B": "2","C": "3"}', rendered)
+
+
+if __name__ == '__main__':
+    unittest.main()