extra note in the docstring [ci skip]

This reverts commit 944d1c0a4a.

.gitignore

@@ -14,4 +14,7 @@ env/
 .project
 .pydevproject
 tests/test_bugfix.py
-htmlcov/
+htmlcov/
+venv
+venv3
+scratchpad

.install_mongodb_on_travis.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
+
+if [ "$MONGODB" = "2.4" ]; then
+    echo "deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen" | sudo tee /etc/apt/sources.list.d/mongodb.list
+    sudo apt-get update
+    sudo apt-get install mongodb-10gen=2.4.14
+    sudo service mongodb start
+elif [ "$MONGODB" = "2.6" ]; then
+    echo "deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen" | sudo tee /etc/apt/sources.list.d/mongodb.list
+    sudo apt-get update
+    sudo apt-get install mongodb-org-server=2.6.12
+    # service should be started automatically
+elif [ "$MONGODB" = "3.0" ]; then
+    echo "deb http://repo.mongodb.org/apt/ubuntu precise/mongodb-org/3.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb.list
+    sudo apt-get update
+    sudo apt-get install mongodb-org-server=3.0.14
+    # service should be started automatically
+else
+    echo "Invalid MongoDB version, expected 2.4, 2.6, or 3.0."
+    exit 1
+fi;

.landscape.yml

@@ -0,0 +1,22 @@
+pylint:
+    disable:
+        # We use this a lot (e.g. via document._meta)
+        - protected-access
+
+    options:
+        additional-builtins:
+            # add xrange and long as valid built-ins. In Python 3, xrange is
+            # translated into range and long is translated into int via 2to3 (see
+            # "use_2to3" in setup.py). This should be removed when we drop Python
+            # 2 support (which probably won't happen any time soon).
+            - xrange
+            - long
+
+pyflakes:
+    disable:
+        # undefined variables are already covered by pylint (and exclude
+        # xrange & long)
+        - F821
+
+ignore-paths:
+    - benchmark.py

.travis.yml

@@ -1,29 +1,47 @@
+# For full coverage, we'd have to test all supported Python, MongoDB, and
+# PyMongo combinations. However, that would result in an overly long build
+# with a very large number of jobs, hence we only test a subset of all the
+# combinations:
+# * MongoDB v2.4 & v3.0 are only tested against Python v2.7 & v3.5.
+# * MongoDB v2.4 is tested against PyMongo v2.7 & v3.x.
+# * MongoDB v3.0 is tested against PyMongo v3.x.
+# * MongoDB v2.6 is currently the "main" version tested against Python v2.7,
+#   v3.5, PyPy & PyPy3, and PyMongo v2.7, v2.8 & v3.x.
+#
+# Reminder: Update README.rst if you change MongoDB versions we test.
+
 language: python
 
 python:
-- '2.6'
+- 2.7
-- '2.7'
+- 3.5
-- '3.3'
-- '3.4'
-- '3.5'
 - pypy
-- pypy3
 
 env:
-- PYMONGO=2.7
+- MONGODB=2.6 PYMONGO=2.7
-- PYMONGO=2.8
+- MONGODB=2.6 PYMONGO=2.8
-- PYMONGO=3.0
+- MONGODB=2.6 PYMONGO=3.0
-- PYMONGO=dev
 
 matrix:
+  # Finish the build as soon as one job fails
   fast_finish: true
 
+  include:
+  - python: 2.7
+    env: MONGODB=2.4 PYMONGO=2.7
+  - python: 2.7
+    env: MONGODB=2.4 PYMONGO=3.0
+  - python: 2.7
+    env: MONGODB=3.0 PYMONGO=3.0
+  - python: 3.5
+    env: MONGODB=2.4 PYMONGO=2.7
+  - python: 3.5
+    env: MONGODB=2.4 PYMONGO=3.0
+  - python: 3.5
+    env: MONGODB=3.0 PYMONGO=3.0
+
 before_install:
-- travis_retry sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
+- bash .install_mongodb_on_travis.sh
-- echo 'deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen' |
-  sudo tee /etc/apt/sources.list.d/mongodb.list
-- travis_retry sudo apt-get update
-- travis_retry sudo apt-get install mongodb-org-server
 
 install:
 - sudo apt-get install python-dev python3-dev libopenjpeg-dev zlib1g-dev libjpeg-turbo8-dev
@@ -31,33 +49,52 @@ install:
   python-tk
 - travis_retry pip install --upgrade pip
 - travis_retry pip install coveralls
-- travis_retry pip install flake8
+- travis_retry pip install flake8 flake8-import-order
 - travis_retry pip install tox>=1.9
 - travis_retry pip install "virtualenv<14.0.0"  # virtualenv>=14.0.0 has dropped Python 3.2 support (and pypy3 is based on py32)
 - travis_retry tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- -e test
 
+# Cache dependencies installed via pip
+cache: pip
+
 # Run flake8 for py27
 before_script:
-- if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then tox -e flake8; fi
+- if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then flake8 .; else echo "flake8 only runs on py27"; fi
 
 script:
 - tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- --with-coverage
 
-after_script: coveralls --verbose
+# For now only submit coveralls for Python v2.7. Python v3.x currently shows
+# 0% coverage. That's caused by 'use_2to3', which builds the py3-compatible
+# code in a separate dir and runs tests on that.
+after_success:
+- if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then coveralls --verbose; fi
 
 notifications:
   irc: irc.freenode.org#mongoengine
 
+# Only run builds on the master branch and GitHub releases (tagged as vX.Y.Z)
 branches:
   only:
   - master
   - /^v.*$/
 
+# Whenever a new release is created via GitHub, publish it on PyPI.
 deploy:
   provider: pypi
   user: the_drow
   password:
     secure: QMyatmWBnC6ZN3XLW2+fTBDU4LQcp1m/LjR2/0uamyeUzWKdlOoh/Wx5elOgLwt/8N9ppdPeG83ose1jOz69l5G0MUMjv8n/RIcMFSpCT59tGYqn3kh55b0cIZXFT9ar+5cxlif6a5rS72IHm5li7QQyxexJIII6Uxp0kpvUmek=
+
+  # create a source distribution and a pure python wheel for faster installs
+  distributions: "sdist bdist_wheel"
+
+  # only deploy on tagged commits (aka GitHub releases) and only for the
+  # parent repo's builds running Python 2.7 along with dev PyMongo (we run
+  # Travis against many different Python and PyMongo versions and we don't
+  # want the deploy to occur multiple times).
   on:
     tags: true
     repo: MongoEngine/mongoengine
+    condition: "$PYMONGO = 3.0"
+    python: 2.7

AUTHORS

@@ -242,3 +242,4 @@ that much better:
  * xiaost7 (https://github.com/xiaost7)
  * Victor Varvaryuk
  * Stanislav Kaledin (https://github.com/sallyruthstruik)
+ * Dmitry Yantsen (https://github.com/mrTable)

CONTRIBUTING.rst

@@ -14,13 +14,13 @@ 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
+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
+MongoEngine supports CPython 2.7 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.
@@ -29,19 +29,20 @@ Style Guide
 -----------
 
 MongoEngine aims to follow `PEP8 <http://www.python.org/dev/peps/pep-0008/>`_
-including 4 space indents. When possible we try to stick to 79 character line limits.
+including 4 space indents. When possible we try to stick to 79 character line
-However, screens got bigger and an ORM has a strong focus on readability and
+limits. However, screens got bigger and an ORM has a strong focus on
-if it can help, we accept 119 as maximum line length, in a similar way as
+readability and if it can help, we accept 119 as maximum line length, in a
-`django does <https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/coding-style/#python-style>`_
+similar way as `django does
+<https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/coding-style/#python-style>`_
 
 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
+and any pull requests are automatically tested. Any pull requests without
-without tests will take longer to be integrated and might be refused.
+tests will take longer to be integrated and might be refused.
 
-You may also submit a simple failing test as a PullRequest if you don't know
+You may also submit a simple failing test as a pull request if you don't know
 how to fix it, it will be easier for other people to work on it and it may get
 fixed faster.
 
@@ -49,13 +50,18 @@ General Guidelines
 ------------------
 
 - Avoid backward breaking changes if at all possible.
+- If you *have* to introduce a breaking change, make it very clear in your
+  pull request's description. Also, describe how users of this package
+  should adapt to the breaking change in docs/upgrade.rst.
 - 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 nosetests``
   from the cmd line to run the test suite).
-- Ensure tests pass on every Python and PyMongo versions.
+- Ensure tests pass on all supported Python, PyMongo, and MongoDB versions.
-  You can test on these versions locally by executing ``tox``
+  You can test various Python and PyMongo versions locally by executing
-- Add enhancements or problematic bug fixes to docs/changelog.rst
+  ``tox``. For different MongoDB versions, you can rely on our automated
+  Travis tests.
+- Add enhancements or problematic bug fixes to docs/changelog.rst.
 - Add yourself to AUTHORS :)
 
 Documentation
@@ -69,3 +75,8 @@ just make your changes to the inline documentation of the appropriate
 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.
+
+If you want to test your documentation changes locally, you need to install
+the ``sphinx`` and ``sphinx_rtd_theme`` packages. Once these are installed,
+go to the ``docs`` directory, run ``make html`` and inspect the updated docs
+by running ``open _build/html/index.html``.

README.rst

@@ -4,7 +4,7 @@ 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)
+:Maintainer: Stefan Wójcik (http://github.com/wojcikstefan)
 
 .. image:: https://travis-ci.org/MongoEngine/mongoengine.svg?branch=master
   :target: https://travis-ci.org/MongoEngine/mongoengine
@@ -19,32 +19,42 @@ MongoEngine
 About
 =====
 MongoEngine is a Python Object-Document Mapper for working with MongoDB.
-Documentation available at https://mongoengine-odm.readthedocs.io - there is currently
+Documentation is available at https://mongoengine-odm.readthedocs.io - there
-a `tutorial <https://mongoengine-odm.readthedocs.io/tutorial.html>`_, a `user guide
+is currently a `tutorial <https://mongoengine-odm.readthedocs.io/tutorial.html>`_,
-<https://mongoengine-odm.readthedocs.io/guide/index.html>`_ and an `API reference
+a `user guide <https://mongoengine-odm.readthedocs.io/guide/index.html>`_, and
-<https://mongoengine-odm.readthedocs.io/apireference.html>`_.
+an `API reference <https://mongoengine-odm.readthedocs.io/apireference.html>`_.
+
+Supported MongoDB Versions
+==========================
+MongoEngine is currently tested against MongoDB v2.4, v2.6, and v3.0. Future
+versions should be supported as well, but aren't actively tested at the moment.
+Make sure to open an issue or submit a pull request if you experience any
+problems with MongoDB v3.2+.
 
 Installation
 ============
 We recommend the use of `virtualenv <https://virtualenv.pypa.io/>`_ and of
 `pip <https://pip.pypa.io/>`_. You can then use ``pip install -U mongoengine``.
-You may also have `setuptools <http://peak.telecommunity.com/DevCenter/setuptools>`_ and thus
+You may also have `setuptools <http://peak.telecommunity.com/DevCenter/setuptools>`_
-you can use ``easy_install -U mongoengine``. Otherwise, you can download the
+and thus you can use ``easy_install -U mongoengine``. Otherwise, you can download the
 source from `GitHub <http://github.com/MongoEngine/mongoengine>`_ and run ``python
 setup.py install``.
 
 Dependencies
 ============
-- pymongo>=2.7.1
+All of the dependencies can easily be installed via `pip <https://pip.pypa.io/>`_.
-- sphinx (optional - for documentation generation)
+At the very least, you'll need these two packages to use MongoEngine:
+
+- pymongo>=2.7.1
+- six>=1.10.0
+
+If you utilize a ``DateTimeField``, you might also use a more flexible date parser:
 
-Optional Dependencies
----------------------
-- **Image Fields**: Pillow>=2.0.0
 - dateutil>=2.1.0
 
-.. note
+If you need to use an ``ImageField`` or ``ImageGridFsProxy``:
-   MongoEngine always runs it's test suite against the latest patch version of each dependecy. e.g.: PyMongo 3.0.1
+
+- Pillow>=2.0.0
 
 Examples
 ========
@@ -57,7 +67,7 @@ Some simple examples of what MongoEngine code looks like:
 
     class BlogPost(Document):
         title = StringField(required=True, max_length=200)
-        posted = DateTimeField(default=datetime.datetime.now)
+        posted = DateTimeField(default=datetime.datetime.utcnow)
         tags = ListField(StringField(max_length=50))
         meta = {'allow_inheritance': True}
 
@@ -87,27 +97,28 @@ Some simple examples of what MongoEngine code looks like:
     ...     print
     ...
 
-    >>> len(BlogPost.objects)
+    # Count all blog posts and its subtypes
+    >>> BlogPost.objects.count()
     2
-    >>> len(TextPost.objects)
+    >>> TextPost.objects.count()
     1
-    >>> len(LinkPost.objects)
+    >>> LinkPost.objects.count()
     1
 
-    # Find tagged posts
+    # Count tagged posts
-    >>> len(BlogPost.objects(tags='mongoengine'))
+    >>> BlogPost.objects(tags='mongoengine').count()
     2
-    >>> len(BlogPost.objects(tags='mongodb'))
+    >>> BlogPost.objects(tags='mongodb').count()
     1
 
 Tests
 =====
 To run the test suite, ensure you are running a local instance of MongoDB on
-the standard port and have ``nose`` installed. Then, run: ``python setup.py nosetests``.
+the standard port and have ``nose`` installed. Then, run ``python setup.py nosetests``.
 
-To run the test suite on every supported Python version and every supported PyMongo version,
+To run the test suite on every supported Python and PyMongo version, you can
-you can use ``tox``.
+use ``tox``. You'll need to make sure you have each supported Python version
-tox and each supported Python version should be installed in your environment:
+installed in your environment and then:
 
 .. code-block:: shell
 
@@ -116,13 +127,16 @@ tox and each supported Python version should be installed in your environment:
     # Run the test suites
     $ tox
 
-If you wish to run one single or selected tests, use the nosetest convention. It will find the folder,
+If you wish to run a subset of tests, use the nosetests convention:
-eventually the file, go to the TestClass specified after the colon and eventually right to the single test.
-Also use the -s argument if you want to print out whatever or access pdb while testing.
 
 .. code-block:: shell
 
-    $ python setup.py nosetests --tests tests/fields/fields.py:FieldTest.test_cls_field -s
+    # Run all the tests in a particular test file
+    $ python setup.py nosetests --tests tests/fields/fields.py
+    # Run only particular test class in that file
+    $ python setup.py nosetests --tests tests/fields/fields.py:FieldTest
+    # Use the -s option if you want to print some debug statements or use pdb
+    $ python setup.py nosetests --tests tests/fields/fields.py:FieldTest -s
 
 Community
 =========
@@ -130,8 +144,7 @@ Community
   <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
 ============
-We welcome contributions! see  the `Contribution guidelines <https://github.com/MongoEngine/mongoengine/blob/master/CONTRIBUTING.rst>`_
+We welcome contributions! See the `Contribution guidelines <https://github.com/MongoEngine/mongoengine/blob/master/CONTRIBUTING.rst>`_

benchmark.py

@@ -1,118 +1,41 @@
 #!/usr/bin/env python
 
+"""
+Simple benchmark comparing PyMongo and MongoEngine.
+
+Sample run on a mid 2015 MacBook Pro (commit b282511):
+
+Benchmarking...
+----------------------------------------------------------------------------------------------------
+Creating 10000 dictionaries - Pymongo
+2.58979988098
+----------------------------------------------------------------------------------------------------
+Creating 10000 dictionaries - Pymongo write_concern={"w": 0}
+1.26657605171
+----------------------------------------------------------------------------------------------------
+Creating 10000 dictionaries - MongoEngine
+8.4351580143
+----------------------------------------------------------------------------------------------------
+Creating 10000 dictionaries without continual assign - MongoEngine
+7.20191693306
+----------------------------------------------------------------------------------------------------
+Creating 10000 dictionaries - MongoEngine - write_concern={"w": 0}, cascade = True
+6.31104588509
+----------------------------------------------------------------------------------------------------
+Creating 10000 dictionaries - MongoEngine, write_concern={"w": 0}, validate=False, cascade=True
+6.07083487511
+----------------------------------------------------------------------------------------------------
+Creating 10000 dictionaries - MongoEngine, write_concern={"w": 0}, validate=False
+5.97704291344
+----------------------------------------------------------------------------------------------------
+Creating 10000 dictionaries - MongoEngine, force_insert=True, write_concern={"w": 0}, validate=False
+5.9111430645
+"""
+
 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 range(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
-    ----------------------------------------------------------------------------------------------------
-    """
     print("Benchmarking...")
 
     setup = """
@@ -131,7 +54,7 @@ noddy = db.noddy
 for i in range(10000):
     example = {'fields': {}}
     for j in range(20):
-        example['fields']["key"+str(j)] = "value "+str(j)
+        example['fields']['key' + str(j)] = 'value ' + str(j)
 
     noddy.save(example)
 
@@ -146,9 +69,10 @@ myNoddys = noddy.find()
 
     stmt = """
 from pymongo import MongoClient
+from pymongo.write_concern import WriteConcern
 connection = MongoClient()
 
-db = connection.timeit_test
+db = connection.get_database('timeit_test', write_concern=WriteConcern(w=0))
 noddy = db.noddy
 
 for i in range(10000):
@@ -156,7 +80,7 @@ for i in range(10000):
     for j in range(20):
         example['fields']["key"+str(j)] = "value "+str(j)
 
-    noddy.save(example, write_concern={"w": 0})
+    noddy.save(example)
 
 myNoddys = noddy.find()
 [n for n in myNoddys] # iterate
@@ -171,10 +95,10 @@ myNoddys = noddy.find()
 from pymongo import MongoClient
 connection = MongoClient()
 connection.drop_database('timeit_test')
-connection.disconnect()
+connection.close()
 
 from mongoengine import Document, DictField, connect
-connect("timeit_test")
+connect('timeit_test')
 
 class Noddy(Document):
     fields = DictField()

docs/_themes/sphinx_rtd_theme/__init__.py

@@ -1,17 +0,0 @@
-"""Sphinx ReadTheDocs theme.
-
-From https://github.com/ryan-roemer/sphinx-bootstrap-theme.
-
-"""
-import os
-
-VERSION = (0, 1, 5)
-
-__version__ = ".".join(str(v) for v in VERSION)
-__version_full__ = __version__
-
-
-def get_html_theme_path():
-    """Return list of HTML theme paths."""
-    cur_dir = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
-    return cur_dir

docs/_themes/sphinx_rtd_theme/breadcrumbs.html

@@ -1,15 +0,0 @@
-<ul class="wy-breadcrumbs">
-  <li><a href="{{ pathto(master_doc) }}">Docs</a> &raquo;</li>
-  <li><a href="">{{ title }}</a></li>
-    <li class="wy-breadcrumbs-aside">
-      {% if display_github %}
-        <a href="https://github.com/{{ github_user }}/{{ github_repo }}/blob/{{ github_version }}{{ conf_py_path }}{{ pagename }}.rst" class="icon icon-github"> Edit on GitHub</a>
-      {% elif display_bitbucket %}
-        <a href="https://bitbucket.org/{{ bitbucket_user }}/{{ bitbucket_repo }}/src/{{ bitbucket_version}}{{ conf_py_path }}{{ pagename }}.rst'" class="icon icon-bitbucket"> Edit on Bitbucket</a>
-      {% elif show_source and has_source and sourcename %}
-        <a href="{{ pathto('_sources/' + sourcename, true)|e }}" rel="nofollow"> View page source</a>
-      {% endif %}
-    </li>
-</ul>
-<hr/>
-

docs/_themes/sphinx_rtd_theme/footer.html

@@ -1,30 +0,0 @@
-<footer>
-  {% if next or prev %}
-    <div class="rst-footer-buttons">
-      {% if next %}
-        <a href="{{ next.link|e }}" class="btn btn-neutral float-right" title="{{ next.title|striptags|e }}">Next <span class="icon icon-circle-arrow-right"></span></a>
-      {% endif %}
-      {% if prev %}
-        <a href="{{ prev.link|e }}" class="btn btn-neutral" title="{{ prev.title|striptags|e }}"><span class="icon icon-circle-arrow-left"></span> Previous</a>
-      {% endif %}
-    </div>
-  {% endif %}
-
-  <hr/>
-
-  <p>
-  {%- if show_copyright %}
-    {%- if hasdoc('copyright') %}
-      {% trans path=pathto('copyright'), copyright=copyright|e %}&copy; <a href="{{ path }}">Copyright</a> {{ copyright }}.{% endtrans %}
-    {%- else %}
-      {% trans copyright=copyright|e %}&copy; Copyright {{ copyright }}.{% endtrans %}
-    {%- endif %}
-  {%- endif %}
-
-  {%- if last_updated %}
-    {% trans last_updated=last_updated|e %}Last updated on {{ last_updated }}.{% endtrans %}
-  {%- endif %}
-  </p>
-
-  {% trans %}<a href="https://www.github.com/snide/sphinx_rtd_theme">Sphinx theme</a> provided by <a href="http://readthedocs.org">Read the Docs</a>{% endtrans %}
-</footer>

docs/_themes/sphinx_rtd_theme/layout.html

@@ -1,142 +0,0 @@
-{# TEMPLATE VAR SETTINGS #}
-{%- set url_root = pathto('', 1) %}
-{%- if url_root == '#' %}{% set url_root = '' %}{% endif %}
-{%- if not embedded and docstitle %}
-  {%- set titlesuffix = " — "|safe + docstitle|e %}
-{%- else %}
-  {%- set titlesuffix = "" %}
-{%- endif %}
-
-<!DOCTYPE html>
-<!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
-<!--[if gt IE 8]><!--> <html class="no-js" lang="en" > <!--<![endif]-->
-<head>
-  <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  {% block htmltitle %}
-  <title>{{ title|striptags|e }}{{ titlesuffix }}</title>
-  {% endblock %}
-
-  {# FAVICON #}
-  {% if favicon %}
-    <link rel="shortcut icon" href="{{ pathto('_static/' + favicon, 1) }}"/>
-  {% endif %}
-  {# CANONICAL #}
-  {%- if theme_canonical_url %}
-    <link rel="canonical" href="{{ theme_canonical_url }}{{ pagename }}.html"/>
-  {%- endif %}
-
-  {# CSS #}
-  <link href='https://fonts.googleapis.com/css?family=Lato:400,700|Roboto+Slab:400,700|Inconsolata:400,700' rel='stylesheet' type='text/css'>
-
-  {# JS #}
-  {% if not embedded %}
-
-    <script type="text/javascript">
-      var DOCUMENTATION_OPTIONS = {
-        URL_ROOT:'{{ url_root }}',
-        VERSION:'{{ release|e }}',
-        COLLAPSE_INDEX:false,
-        FILE_SUFFIX:'{{ '' if no_search_suffix else file_suffix }}',
-        HAS_SOURCE:  {{ has_source|lower }}
-      };
-    </script>
-    {%- for scriptfile in script_files %}
-      <script type="text/javascript" src="{{ pathto(scriptfile, 1) }}"></script>
-    {%- endfor %}
-
-    {% if use_opensearch %}
-      <link rel="search" type="application/opensearchdescription+xml" title="{% trans docstitle=docstitle|e %}Search within {{ docstitle }}{% endtrans %}" href="{{ pathto('_static/opensearch.xml', 1) }}"/>
-    {% endif %}
-
-  {% endif %}
-
-  {# RTD hosts these file themselves, so just load on non RTD builds #}
-  {% if not READTHEDOCS %}
-    <link rel="stylesheet" href="{{ pathto('_static/' + style, 1) }}" type="text/css" />
-    <script type="text/javascript" src="_static/js/theme.js"></script>
-  {% endif %}
-
-  {% for cssfile in css_files %}
-    <link rel="stylesheet" href="{{ pathto(cssfile, 1) }}" type="text/css" />
-  {% endfor %}
-
-  {%- block linktags %}
-    {%- if hasdoc('about') %}
-        <link rel="author" title="{{ _('About these documents') }}"
-              href="{{ pathto('about') }}"/>
-    {%- endif %}
-    {%- if hasdoc('genindex') %}
-        <link rel="index" title="{{ _('Index') }}"
-              href="{{ pathto('genindex') }}"/>
-    {%- endif %}
-    {%- if hasdoc('search') %}
-        <link rel="search" title="{{ _('Search') }}" href="{{ pathto('search') }}"/>
-    {%- endif %}
-    {%- if hasdoc('copyright') %}
-        <link rel="copyright" title="{{ _('Copyright') }}" href="{{ pathto('copyright') }}"/>
-    {%- endif %}
-    <link rel="top" title="{{ docstitle|e }}" href="{{ pathto('index') }}"/>
-    {%- if parents %}
-        <link rel="up" title="{{ parents[-1].title|striptags|e }}" href="{{ parents[-1].link|e }}"/>
-    {%- endif %}
-    {%- if next %}
-        <link rel="next" title="{{ next.title|striptags|e }}" href="{{ next.link|e }}"/>
-    {%- endif %}
-    {%- if prev %}
-        <link rel="prev" title="{{ prev.title|striptags|e }}" href="{{ prev.link|e }}"/>
-    {%- endif %}
-  {%- endblock %}
-  {%- block extrahead %} {% endblock %}
-
-  <script src="//cdnjs.cloudflare.com/ajax/libs/modernizr/2.6.2/modernizr.min.js"></script>
-
-</head>
-
-<body class="wy-body-for-nav">
-
-  <div class="wy-grid-for-nav">
-
-    {# SIDE NAV, TOGGLES ON MOBILE #}
-    <nav data-toggle="wy-nav-shift" class="wy-nav-side">
-      <div class="wy-side-nav-search">
-        <a href="{{ pathto(master_doc) }}" class="icon icon-home"> {{ project }}</a>
-        {% include "searchbox.html" %}
-      </div>
-
-      <div class="wy-menu wy-menu-vertical" data-spy="affix">
-        {% set toctree = toctree(maxdepth=2, collapse=False, includehidden=True) %}
-        {% if toctree %}
-            {{ toctree }}
-        {% else %}
-            <!-- Local TOC -->
-            <div class="local-toc">{{ toc }}</div>
-        {% endif %}
-      </div>
-      &nbsp;
-    </nav>
-
-    <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
-
-      {# MOBILE NAV, TRIGGLES SIDE NAV ON TOGGLE #}
-      <nav class="wy-nav-top">
-        <i data-toggle="wy-nav-top" class="icon icon-reorder"></i>
-        <a href="{{ pathto(master_doc) }}">{{ project }}</a>
-      </nav>
-
-
-      {# PAGE CONTENT #}
-      <div class="wy-nav-content">
-        <div class="rst-content">
-          {% include "breadcrumbs.html" %}
-          {% block body %}{% endblock %}
-          {% include "footer.html" %}
-        </div>
-      </div>
-
-    </section>
-
-  </div>
-  {% include "versions.html" %}
-</body>
-</html>

docs/_themes/sphinx_rtd_theme/layout_old.html

@@ -1,205 +0,0 @@
-{#
-    basic/layout.html
-    ~~~~~~~~~~~~~~~~~
-
-    Master layout template for Sphinx themes.
-
-    :copyright: Copyright 2007-2013 by the Sphinx team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-#}
-{%- block doctype -%}
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
-  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-{%- endblock %}
-{%- set reldelim1 = reldelim1 is not defined and ' &raquo;' or reldelim1 %}
-{%- set reldelim2 = reldelim2 is not defined and ' |' or reldelim2 %}
-{%- set render_sidebar = (not embedded) and (not theme_nosidebar|tobool) and
-                         (sidebars != []) %}
-{%- set url_root = pathto('', 1) %}
-{# XXX necessary? #}
-{%- if url_root == '#' %}{% set url_root = '' %}{% endif %}
-{%- if not embedded and docstitle %}
-  {%- set titlesuffix = " &mdash; "|safe + docstitle|e %}
-{%- else %}
-  {%- set titlesuffix = "" %}
-{%- endif %}
-
-{%- macro relbar() %}
-    <div class="related">
-      <h3>{{ _('Navigation') }}</h3>
-      <ul>
-        {%- for rellink in rellinks %}
-        <li class="right" {% if loop.first %}style="margin-right: 10px"{% endif %}>
-          <a href="{{ pathto(rellink[0]) }}" title="{{ rellink[1]|striptags|e }}"
-             {{ accesskey(rellink[2]) }}>{{ rellink[3] }}</a>
-          {%- if not loop.first %}{{ reldelim2 }}{% endif %}</li>
-        {%- endfor %}
-        {%- block rootrellink %}
-        <li><a href="{{ pathto(master_doc) }}">{{ shorttitle|e }}</a>{{ reldelim1 }}</li>
-        {%- endblock %}
-        {%- for parent in parents %}
-          <li><a href="{{ parent.link|e }}" {% if loop.last %}{{ accesskey("U") }}{% endif %}>{{ parent.title }}</a>{{ reldelim1 }}</li>
-        {%- endfor %}
-        {%- block relbaritems %} {% endblock %}
-      </ul>
-    </div>
-{%- endmacro %}
-
-{%- macro sidebar() %}
-      {%- if render_sidebar %}
-      <div class="sphinxsidebar">
-        <div class="sphinxsidebarwrapper">
-          {%- block sidebarlogo %}
-          {%- if logo %}
-            <p class="logo"><a href="{{ pathto(master_doc) }}">
-              <img class="logo" src="{{ pathto('_static/' + logo, 1) }}" alt="Logo"/>
-            </a></p>
-          {%- endif %}
-          {%- endblock %}
-          {%- if sidebars != None %}
-            {#- new style sidebar: explicitly include/exclude templates #}
-            {%- for sidebartemplate in sidebars %}
-            {%- include sidebartemplate %}
-            {%- endfor %}
-          {%- else %}
-            {#- old style sidebars: using blocks -- should be deprecated #}
-            {%- block sidebartoc %}
-            {%- include "localtoc.html" %}
-            {%- endblock %}
-            {%- block sidebarrel %}
-            {%- include "relations.html" %}
-            {%- endblock %}
-            {%- block sidebarsourcelink %}
-            {%- include "sourcelink.html" %}
-            {%- endblock %}
-            {%- if customsidebar %}
-            {%- include customsidebar %}
-            {%- endif %}
-            {%- block sidebarsearch %}
-            {%- include "searchbox.html" %}
-            {%- endblock %}
-          {%- endif %}
-        </div>
-      </div>
-      {%- endif %}
-{%- endmacro %}
-
-{%- macro script() %}
-    <script type="text/javascript">
-      var DOCUMENTATION_OPTIONS = {
-        URL_ROOT:    '{{ url_root }}',
-        VERSION:     '{{ release|e }}',
-        COLLAPSE_INDEX: false,
-        FILE_SUFFIX: '{{ '' if no_search_suffix else file_suffix }}',
-        HAS_SOURCE:  {{ has_source|lower }}
-      };
-    </script>
-    {%- for scriptfile in script_files %}
-    <script type="text/javascript" src="{{ pathto(scriptfile, 1) }}"></script>
-    {%- endfor %}
-{%- endmacro %}
-
-{%- macro css() %}
-    <link rel="stylesheet" href="{{ pathto('_static/' + style, 1) }}" type="text/css" />
-    <link rel="stylesheet" href="{{ pathto('_static/pygments.css', 1) }}" type="text/css" />
-    {%- for cssfile in css_files %}
-    <link rel="stylesheet" href="{{ pathto(cssfile, 1) }}" type="text/css" />
-    {%- endfor %}
-{%- endmacro %}
-
-<html xmlns="http://www.w3.org/1999/xhtml">
-  <head>
-    <meta http-equiv="Content-Type" content="text/html; charset={{ encoding }}" />
-    {{ metatags }}
-    {%- block htmltitle %}
-    <title>{{ title|striptags|e }}{{ titlesuffix }}</title>
-    {%- endblock %}
-    {{ css() }}
-    {%- if not embedded %}
-    {{ script() }}
-    {%- if use_opensearch %}
-    <link rel="search" type="application/opensearchdescription+xml"
-          title="{% trans docstitle=docstitle|e %}Search within {{ docstitle }}{% endtrans %}"
-          href="{{ pathto('_static/opensearch.xml', 1) }}"/>
-    {%- endif %}
-    {%- if favicon %}
-    <link rel="shortcut icon" href="{{ pathto('_static/' + favicon, 1) }}"/>
-    {%- endif %}
-    {%- endif %}
-{%- block linktags %}
-    {%- if hasdoc('about') %}
-    <link rel="author" title="{{ _('About these documents') }}" href="{{ pathto('about') }}" />
-    {%- endif %}
-    {%- if hasdoc('genindex') %}
-    <link rel="index" title="{{ _('Index') }}" href="{{ pathto('genindex') }}" />
-    {%- endif %}
-    {%- if hasdoc('search') %}
-    <link rel="search" title="{{ _('Search') }}" href="{{ pathto('search') }}" />
-    {%- endif %}
-    {%- if hasdoc('copyright') %}
-    <link rel="copyright" title="{{ _('Copyright') }}" href="{{ pathto('copyright') }}" />
-    {%- endif %}
-    <link rel="top" title="{{ docstitle|e }}" href="{{ pathto('index') }}" />
-    {%- if parents %}
-    <link rel="up" title="{{ parents[-1].title|striptags|e }}" href="{{ parents[-1].link|e }}" />
-    {%- endif %}
-    {%- if next %}
-    <link rel="next" title="{{ next.title|striptags|e }}" href="{{ next.link|e }}" />
-    {%- endif %}
-    {%- if prev %}
-    <link rel="prev" title="{{ prev.title|striptags|e }}" href="{{ prev.link|e }}" />
-    {%- endif %}
-{%- endblock %}
-{%- block extrahead %} {% endblock %}
-  </head>
-  <body>
-{%- block header %}{% endblock %}
-
-{%- block relbar1 %}{{ relbar() }}{% endblock %}
-
-{%- block content %}
-  {%- block sidebar1 %} {# possible location for sidebar #} {% endblock %}
-
-    <div class="document">
-  {%- block document %}
-      <div class="documentwrapper">
-      {%- if render_sidebar %}
-        <div class="bodywrapper">
-      {%- endif %}
-          <div class="body">
-            {% block body %} {% endblock %}
-          </div>
-      {%- if render_sidebar %}
-        </div>
-      {%- endif %}
-      </div>
-  {%- endblock %}
-
-  {%- block sidebar2 %}{{ sidebar() }}{% endblock %}
-      <div class="clearer"></div>
-    </div>
-{%- endblock %}
-
-{%- block relbar2 %}{{ relbar() }}{% endblock %}
-
-{%- block footer %}
-    <div class="footer">
-    {%- if show_copyright %}
-      {%- if hasdoc('copyright') %}
-        {% trans path=pathto('copyright'), copyright=copyright|e %}&copy; <a href="{{ path }}">Copyright</a> {{ copyright }}.{% endtrans %}
-      {%- else %}
-        {% trans copyright=copyright|e %}&copy; Copyright {{ copyright }}.{% endtrans %}
-      {%- endif %}
-    {%- endif %}
-    {%- if last_updated %}
-      {% trans last_updated=last_updated|e %}Last updated on {{ last_updated }}.{% endtrans %}
-    {%- endif %}
-    {%- if show_sphinx %}
-      {% trans sphinx_version=sphinx_version|e %}Created using <a href="http://sphinx-doc.org/">Sphinx</a> {{ sphinx_version }}.{% endtrans %}
-    {%- endif %}
-    </div>
-    <p>asdf asdf asdf asdf 22</p>
-{%- endblock %}
-  </body>
-</html>
-

docs/_themes/sphinx_rtd_theme/search.html

@@ -1,50 +0,0 @@
-{#
-    basic/search.html
-    ~~~~~~~~~~~~~~~~~
-
-    Template for the search page.
-
-    :copyright: Copyright 2007-2013 by the Sphinx team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-#}
-{%- extends "layout.html" %}
-{% set title = _('Search') %}
-{% set script_files = script_files + ['_static/searchtools.js'] %}
-{% block extrahead %}
-  <script type="text/javascript">
-    jQuery(function() { Search.loadIndex("{{ pathto('searchindex.js', 1) }}"); });
-  </script>
-  {# this is used when loading the search index using $.ajax fails,
-     such as on Chrome for documents on localhost #}
-  <script type="text/javascript" id="searchindexloader"></script>
-  {{ super() }}
-{% endblock %}
-{% block body %}
-  <noscript>
-  <div id="fallback" class="admonition warning">
-    <p class="last">
-      {% trans %}Please activate JavaScript to enable the search
-      functionality.{% endtrans %}
-    </p>
-  </div>
-  </noscript>
-
-  {% if search_performed %}
-    <h2>{{ _('Search Results') }}</h2>
-    {% if not search_results %}
-      <p>{{ _('Your search did not match any documents. Please make sure that all words are spelled correctly and that you\'ve selected enough categories.') }}</p>
-    {% endif %}
-  {% endif %}
-  <div id="search-results">
-  {% if search_results %}
-    <ul>
-    {% for href, caption, context in search_results %}
-      <li>
-        <a href="{{ pathto(item.href) }}">{{ caption }}</a>
-        <p class="context">{{ context|e }}</p>
-      </li>
-    {% endfor %}
-    </ul>
-  {% endif %}
-  </div>
-{% endblock %}

docs/_themes/sphinx_rtd_theme/searchbox.html

@@ -1,5 +0,0 @@
-<form id ="rtd-search-form" class="wy-form" action="{{ pathto('search') }}" method="get">
-  <input type="text" name="q" placeholder="Search docs" />
-  <input type="hidden" name="check_keywords" value="yes" />
-  <input type="hidden" name="area" value="default" />
-</form>

docs/_themes/sphinx_rtd_theme/static/css/badge_only.css

@@ -1 +0,0 @@
-.font-smooth,.icon:before{-webkit-font-smoothing:antialiased}.clearfix{*zoom:1}.clearfix:before,.clearfix:after{display:table;content:""}.clearfix:after{clear:both}@font-face{font-family:fontawesome-webfont;font-weight:normal;font-style:normal;src:url("../font/fontawesome_webfont.eot");src:url("../font/fontawesome_webfont.eot?#iefix") format("embedded-opentype"),url("../font/fontawesome_webfont.woff") format("woff"),url("../font/fontawesome_webfont.ttf") format("truetype"),url("../font/fontawesome_webfont.svg#fontawesome-webfont") format("svg")}.icon:before{display:inline-block;font-family:fontawesome-webfont;font-style:normal;font-weight:normal;line-height:1;text-decoration:inherit}a .icon{display:inline-block;text-decoration:inherit}li .icon{display:inline-block}li .icon-large:before,li .icon-large:before{width:1.875em}ul.icons{list-style-type:none;margin-left:2em;text-indent:-0.8em}ul.icons li .icon{width:0.8em}ul.icons li .icon-large:before,ul.icons li .icon-large:before{vertical-align:baseline}.icon-book:before{content:"\f02d"}.icon-caret-down:before{content:"\f0d7"}.icon-caret-up:before{content:"\f0d8"}.icon-caret-left:before{content:"\f0d9"}.icon-caret-right:before{content:"\f0da"}.rst-versions{position:fixed;bottom:0;left:0;width:300px;color:#fcfcfc;background:#1f1d1d;border-top:solid 10px #343131;font-family:"Lato","proxima-nova","Helvetica Neue",Arial,sans-serif;z-index:400}.rst-versions a{color:#2980b9;text-decoration:none}.rst-versions .rst-badge-small{display:none}.rst-versions .rst-current-version{padding:12px;background-color:#272525;display:block;text-align:right;font-size:90%;cursor:pointer;color:#27ae60;*zoom:1}.rst-versions .rst-current-version:before,.rst-versions .rst-current-version:after{display:table;content:""}.rst-versions .rst-current-version:after{clear:both}.rst-versions .rst-current-version .icon{color:#fcfcfc}.rst-versions .rst-current-version .icon-book{float:left}.rst-versions .rst-current-version.rst-out-of-date{background-color:#e74c3c;color:#fff}.rst-versions.shift-up .rst-other-versions{display:block}.rst-versions .rst-other-versions{font-size:90%;padding:12px;color:gray;display:none}.rst-versions .rst-other-versions hr{display:block;height:1px;border:0;margin:20px 0;padding:0;border-top:solid 1px #413d3d}.rst-versions .rst-other-versions dd{display:inline-block;margin:0}.rst-versions .rst-other-versions dd a{display:inline-block;padding:6px;color:#fcfcfc}.rst-versions.rst-badge{width:auto;bottom:20px;right:20px;left:auto;border:none;max-width:300px}.rst-versions.rst-badge .icon-book{float:none}.rst-versions.rst-badge.shift-up .rst-current-version{text-align:right}.rst-versions.rst-badge.shift-up .rst-current-version .icon-book{float:left}.rst-versions.rst-badge .rst-current-version{width:auto;height:30px;line-height:30px;padding:0 6px;display:block;text-align:center}@media screen and (max-width: 768px){.rst-versions{width:85%;display:none}.rst-versions.shift{display:block}img{width:100%;height:auto}}

docs/_themes/sphinx_rtd_theme/static/font/fontawesome_webfont.svg

@@ -1,399 +0,0 @@
-<?xml version="1.0" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
-<svg xmlns="http://www.w3.org/2000/svg">
-<metadata></metadata>
-<defs>
-<font id="fontawesomeregular" horiz-adv-x="1536" >
-<font-face units-per-em="1792" ascent="1536" descent="-256" />
-<missing-glyph horiz-adv-x="448" />
-<glyph unicode=" "  horiz-adv-x="448" />
-<glyph unicode="&#x09;" horiz-adv-x="448" />
-<glyph unicode="&#xa0;" horiz-adv-x="448" />
-<glyph unicode="&#xa8;" horiz-adv-x="1792" />
-<glyph unicode="&#xa9;" horiz-adv-x="1792" />
-<glyph unicode="&#xae;" horiz-adv-x="1792" />
-<glyph unicode="&#xb4;" horiz-adv-x="1792" />
-<glyph unicode="&#xc6;" horiz-adv-x="1792" />
-<glyph unicode="&#x2000;" horiz-adv-x="768" />
-<glyph unicode="&#x2001;" />
-<glyph unicode="&#x2002;" horiz-adv-x="768" />
-<glyph unicode="&#x2003;" />
-<glyph unicode="&#x2004;" horiz-adv-x="512" />
-<glyph unicode="&#x2005;" horiz-adv-x="384" />
-<glyph unicode="&#x2006;" horiz-adv-x="256" />
-<glyph unicode="&#x2007;" horiz-adv-x="256" />
-<glyph unicode="&#x2008;" horiz-adv-x="192" />
-<glyph unicode="&#x2009;" horiz-adv-x="307" />
-<glyph unicode="&#x200a;" horiz-adv-x="85" />
-<glyph unicode="&#x202f;" horiz-adv-x="307" />
-<glyph unicode="&#x205f;" horiz-adv-x="384" />
-<glyph unicode="&#x2122;" horiz-adv-x="1792" />
-<glyph unicode="&#x221e;" horiz-adv-x="1792" />
-<glyph unicode="&#x2260;" horiz-adv-x="1792" />
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docs/_themes/sphinx_rtd_theme/static/js/theme.js

@@ -1,16 +0,0 @@
-$( document ).ready(function() {
-  // Shift nav in mobile when clicking the menu.
-  $("[data-toggle='wy-nav-top']").click(function() {
-    $("[data-toggle='wy-nav-shift']").toggleClass("shift");
-    $("[data-toggle='rst-versions']").toggleClass("shift");
-  });
-  // Close menu when you click a link.
-  $(".wy-menu-vertical .current ul li a").click(function() {
-    $("[data-toggle='wy-nav-shift']").removeClass("shift");
-    $("[data-toggle='rst-versions']").toggleClass("shift");
-  });
-  $("[data-toggle='rst-current-version']").click(function() {
-    $("[data-toggle='rst-versions']").toggleClass("shift-up");
-  });
-  $("table.docutils:not(.field-list").wrap("<div class='wy-table-responsive'></div>");
-});

docs/_themes/sphinx_rtd_theme/theme.conf

@@ -1,8 +0,0 @@
-[theme]
-inherit = basic
-stylesheet = css/theme.css
-
-[options]
-typekit_id = hiw1hhg
-analytics_id =
-canonical_url =

docs/_themes/sphinx_rtd_theme/versions.html

@@ -1,37 +0,0 @@
-{% if READTHEDOCS %}
-{# Add rst-badge after rst-versions for small badge style. #}
-  <div class="rst-versions" data-toggle="rst-versions">
-    <span class="rst-current-version" data-toggle="rst-current-version">
-      <span class="icon icon-book"> Read the Docs</span>
-      v: {{ current_version }} 
-      <span class="icon icon-caret-down"></span>
-    </span>
-    <div class="rst-other-versions">
-      <dl>
-        <dt>Versions</dt>
-        {% for slug, url in versions %}
-          <dd><a href="{{ url }}">{{ slug }}</a></dd>
-        {% endfor %}
-      </dl>
-      <dl>
-        <dt>Downloads</dt>
-        {% for type, url in downloads %}
-          <dd><a href="{{ url }}">{{ type }}</a></dd>
-        {% endfor %}
-      </dl>
-      <dl>
-        <dt>On Read the Docs</dt>
-          <dd>
-            <a href="//{{ PRODUCTION_DOMAIN }}/projects/{{ slug }}/?fromdocs={{ slug }}">Project Home</a>
-          </dd>
-          <dd>
-            <a href="//{{ PRODUCTION_DOMAIN }}/builds/{{ slug }}/?fromdocs={{ slug }}">Builds</a>
-          </dd>
-      </dl>
-      <hr/>
-      Free document hosting provided by <a href="http://www.readthedocs.org">Read the Docs</a>.
-
-    </div>
-  </div>
-{% endif %}
-

docs/changelog.rst

@@ -2,11 +2,54 @@
 Changelog
 =========
 
+Development
+===========
+- (Fill this out as you fix issues and develop your features).
+
+Changes in 0.13.0
+=================
+- POTENTIAL BREAKING CHANGE: Added Unicode support to the `EmailField`, see
+  docs/upgrade.rst for details.
+
+Changes in 0.12.0
+=================
+- POTENTIAL BREAKING CHANGE: Fixed limit/skip/hint/batch_size chaining #1476
+- POTENTIAL BREAKING CHANGE: Changed a public `QuerySet.clone_into` method to a private `QuerySet._clone_into` #1476
+- Fixed the way `Document.objects.create` works with duplicate IDs #1485
+- Fixed connecting to a replica set with PyMongo 2.x #1436
+- Fixed using sets in field choices #1481
+- Fixed deleting items from a `ListField` #1318
+- Fixed an obscure error message when filtering by `field__in=non_iterable`. #1237
+- Fixed behavior of a `dec` update operator #1450
+- Added a `rename` update operator #1454
+- Added validation for the `db_field` parameter #1448
+- Fixed the error message displayed when querying an `EmbeddedDocumentField` by an invalid value #1440
+- Fixed the error message displayed when validating unicode URLs #1486
+- Raise an error when trying to save an abstract document #1449
+
+Changes in 0.11.0
+=================
+- BREAKING CHANGE: Renamed `ConnectionError` to `MongoEngineConnectionError` since the former is a built-in exception name in Python v3.x. #1428
+- BREAKING CHANGE: Dropped Python 2.6 support. #1428
+- BREAKING CHANGE: `from mongoengine.base import ErrorClass` won't work anymore for any error from `mongoengine.errors` (e.g. `ValidationError`). Use `from mongoengine.errors import ErrorClass instead`. #1428
+- BREAKING CHANGE: Accessing a broken reference will raise a `DoesNotExist` error. In the past it used to return `None`. #1334
+- Fixed absent rounding for DecimalField when `force_string` is set. #1103
+
 Changes in 0.10.8
 =================
+- Added support for QuerySet.batch_size (#1426)
+- Fixed query set iteration within iteration #1427
+- Fixed an issue where specifying a MongoDB URI host would override more information than it should #1421
+- Added ability to filter the generic reference field by ObjectId and DBRef #1425
+- Fixed delete cascade for models with a custom primary key field #1247
 - Added ability to specify an authentication mechanism (e.g. X.509) #1333
 - Added support for falsey primary keys (e.g. doc.pk = 0) #1354
-- Fixed BaseQuerySet#sum/average for fields w/ explicit db_field #1417
+- Fixed QuerySet#sum/average for fields w/ explicit db_field #1417
+- Fixed filtering by embedded_doc=None #1422
+- Added support for cursor.comment #1420
+- Fixed doc.get_<field>_display #1419
+- Fixed __repr__ method of the StrictDict #1424
+- Added a deprecation warning for Python 2.6
 
 Changes in 0.10.7
 =================

docs/conf.py

@@ -13,6 +13,10 @@
 
 import sys, os
 
+import sphinx_rtd_theme
+
+import mongoengine
+
 # 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.
@@ -44,7 +48,6 @@ copyright = u'2009, MongoEngine Authors'
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
-import mongoengine
 # The short X.Y version.
 version = mongoengine.get_version()
 # The full version, including alpha/beta/rc tags.
@@ -97,10 +100,12 @@ html_theme = 'sphinx_rtd_theme'
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
 # documentation.
-#html_theme_options = {}
+html_theme_options = {
+    'canonical_url': 'http://docs.mongoengine.org/en/latest/'
+}
 
 # Add any paths that contain custom themes here, relative to this directory.
-html_theme_path = ['_themes']
+html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".
@@ -199,7 +204,3 @@ latex_documents = [
 #latex_use_modindex = True
 
 autoclass_content = 'both'
-
-html_theme_options = dict(
-    canonical_url='http://docs.mongoengine.org/en/latest/'
-)

docs/guide/connecting.rst

@@ -33,7 +33,7 @@ the :attr:`host` to
     corresponding parameters in :func:`~mongoengine.connect`: ::
 
         connect(
-            name='test',
+            db='test',
             username='user',
             password='12345',
             host='mongodb://admin:qwerty@localhost/production'
@@ -42,13 +42,18 @@ the :attr:`host` to
     will establish connection to ``production`` database using
     ``admin`` username and ``qwerty`` password.
 
-ReplicaSets
+Replica Sets
-===========
+============
 
-MongoEngine supports
+MongoEngine supports connecting to replica sets::
-:class:`~pymongo.mongo_replica_set_client.MongoReplicaSetClient`. To use them,
+
-please use an URI style connection and provide the ``replicaSet`` name
+    from mongoengine import connect
-in the connection kwargs.
+
+    # Regular connect
+    connect('dbname', replicaset='rs-name')
+
+    # MongoDB URI-style connect
+    connect(host='mongodb://localhost/dbname?replicaSet=rs-name')
 
 Read preferences are supported through the connection or via individual
 queries by passing the read_preference ::
@@ -59,76 +64,74 @@ queries by passing the read_preference ::
 Multiple Databases
 ==================
 
-Multiple database support was added in MongoEngine 0.6. To use multiple
+To use multiple databases you can use :func:`~mongoengine.connect` and provide
-databases you can use :func:`~mongoengine.connect` and provide an `alias` name
+an `alias` name for the connection - if no `alias` is provided then "default"
-for the connection - if no `alias` is provided then "default" is used.
+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
+`db_alias` in their meta data. This allows :class:`~pymongo.dbref.DBRef`
-to point across databases and collections.  Below is an example schema, using
+objects to point across databases and collections. Below is an example schema,
-3 different databases to store data::
+using 3 different databases to store data::
 
         class User(Document):
             name = StringField()
 
-            meta = {"db_alias": "user-db"}
+            meta = {'db_alias': 'user-db'}
 
         class Book(Document):
             name = StringField()
 
-            meta = {"db_alias": "book-db"}
+            meta = {'db_alias': 'book-db'}
 
         class AuthorBooks(Document):
             author = ReferenceField(User)
             book = ReferenceField(Book)
 
-            meta = {"db_alias": "users-books-db"}
+            meta = {'db_alias': 'users-books-db'}
 
 
 Context Managers
 ================
-Sometimes you may want to switch the database or collection to query against
+Sometimes you may want to switch the database or collection to query against.
-for a class.
 For example, archiving older data into a separate database for performance
 reasons or writing functions that dynamically choose collections to write
-document to.
+a document to.
 
 Switch Database
 ---------------
 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 the same User document across databases::
+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"}
+        meta = {'db_alias': 'user-db'}
 
     with switch_db(User, 'archive-user-db') as User:
-        User(name="Ross").save()  # Saves the 'archive-user-db'
+        User(name='Ross').save()  # Saves the 'archive-user-db'
 
 
 Switch Collection
 -----------------
 The :class:`~mongoengine.context_managers.switch_collection` context manager
 allows you to change the collection for a given class allowing quick and easy
-access the same Group document across collection::
+access to the same Group document across collection::
 
         from mongoengine.context_managers import switch_collection
 
         class Group(Document):
             name = StringField()
 
-        Group(name="test").save()  # Saves in the default db
+        Group(name='test').save()  # Saves in the default db
 
         with switch_collection(Group, 'group2000') as Group:
-            Group(name="hello Group 2000 collection!").save()  # Saves in group2000 collection
+            Group(name='hello Group 2000 collection!').save()  # Saves in group2000 collection
-
 
 
 .. note:: Make sure any aliases have been registered with

docs/guide/defining-documents.rst

@@ -150,7 +150,7 @@ arguments can be set on all fields:
     .. note:: If set, this field is also accessible through the `pk` field.
 
 :attr:`choices` (Default: None)
-    An iterable (e.g. a list or tuple) of choices to which the value of this
+    An iterable (e.g. list, tuple or set) 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
@@ -214,8 +214,8 @@ document class as the first argument::
 
 Dictionary Fields
 -----------------
-Often, an embedded document may be used instead of a dictionary – generally 
+Often, an embedded document may be used instead of a dictionary – generally
-embedded documents are recommended as dictionaries don’t support validation 
+embedded documents are 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::
 
@@ -361,11 +361,6 @@ Its value can take any of the following constants:
    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,

docs/guide/installing.rst

@@ -2,13 +2,13 @@
 Installing MongoEngine
 ======================
 
-To use MongoEngine, you will need to download `MongoDB <http://mongodb.org/>`_
+To use MongoEngine, you will need to download `MongoDB <http://mongodb.com/>`_
 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 :program:`pip`:
+MongoEngine is available on PyPI, so you can use :program:`pip`:
 
 .. code-block:: console
 

docs/guide/querying.rst

@@ -340,14 +340,19 @@ Javascript code that is executed on the database server.
 
 Counting results
 ----------------
-Just as with limiting and skipping results, there is a method on
+Just as with limiting and skipping results, there is a method on a
-:class:`~mongoengine.queryset.QuerySet` objects --
+:class:`~mongoengine.queryset.QuerySet` object --
-:meth:`~mongoengine.queryset.QuerySet.count`, but there is also a more Pythonic
+:meth:`~mongoengine.queryset.QuerySet.count`::
-way of achieving this::
 
-    num_users = len(User.objects)
+    num_users = User.objects.count()
 
-Even if len() is the Pythonic way of counting results, keep in mind that if you concerned about performance, :meth:`~mongoengine.queryset.QuerySet.count` is the way to go since it only execute a server side count query, while len() retrieves the results, places them in cache, and finally counts them. If we compare the performance of the two operations, len() is much slower than :meth:`~mongoengine.queryset.QuerySet.count`.
+You could technically use ``len(User.objects)`` to get the same result, but it
+would be significantly slower than :meth:`~mongoengine.queryset.QuerySet.count`.
+When you execute a server-side count query, you let MongoDB do the heavy
+lifting and you receive a single integer over the wire. Meanwhile, len()
+retrieves all the results, places them in a local cache, and finally counts
+them. If we compare the performance of the two operations, len() is much slower
+than :meth:`~mongoengine.queryset.QuerySet.count`.
 
 Further aggregation
 -------------------
@@ -479,6 +484,8 @@ operators. To use a :class:`~mongoengine.queryset.Q` object, pass it in as the
 first positional argument to :attr:`Document.objects` when you filter it by
 calling it with keyword arguments::
 
+    from mongoengine.queryset.visitor import Q
+
     # Get published posts
     Post.objects(Q(published=True) | Q(publish_date__lte=datetime.now()))
 

docs/guide/signals.rst

@@ -142,11 +142,4 @@ cleaner looking while still allowing manual execution of the callback::
         modified = DateTimeField()
 
 
-ReferenceFields and Signals
----------------------------
-
-Currently `reverse_delete_rule` does 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/tutorial.rst

@@ -3,11 +3,10 @@ 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
+through how to create a simple **Tumblelog** application. A tumblelog is a
-of blog where posts are not constrained to being conventional text-based posts.
+blog that supports mixed media content, including text, images, links, video,
-As well as text-based entries, users may post images, links, videos, etc. For
+audio, etc. For simplicity's sake, we'll stick to text, image, and link
-simplicity's sake, we'll stick to text, image and link entries in our
+entries. As the purpose of this tutorial is to introduce MongoEngine, we'll
-application. As the purpose of this tutorial is to introduce MongoEngine, we'll
 focus on the data-modelling side of the application, leaving out a user
 interface.
 
@@ -16,14 +15,14 @@ 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. If you haven't installed mongoengine,
+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. If running locally the only argument we need to provide is the name
+function. If running locally, the only argument we need to provide is the name
 of the MongoDB database to use::
 
     from mongoengine import *
@@ -39,18 +38,18 @@ 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
-to the data model. However, defining schemata for our documents can help to
+to the data model. However, defining schemas for our documents can help to iron
-iron out bugs involving incorrect types or missing fields, and also allow us to
+out bugs involving incorrect types or missing fields, and also allow us to
 define utility methods on our documents in the same way that traditional
 :abbr:`ORMs (Object-Relational Mappers)` do.
 
 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
+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 of
 **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
-specific 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 other document models are slightly
 more involved.
 
@@ -78,7 +77,7 @@ 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
 individual posts, we would put a column in the comments table that contained a
-foreign key to the posts table.  We'd also need a link table to provide the
+foreign key to the posts table. We'd also need a link table to provide the
 many-to-many relationship between posts and tags. Then we'd need to address the
 problem of storing the specialised post-types (text, image and link). There are
 several ways we can achieve this, but each of them have their problems --- none
@@ -96,7 +95,7 @@ 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 --- all you need do is turn on inheritance
+this kind of modeling 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):
@@ -128,8 +127,8 @@ link table, we can just store a list of tags in each post. So, for both
 efficiency and simplicity's sake, we'll store the tags as strings directly
 within the post, rather than storing references to tags in a separate
 collection. Especially as tags are generally very short (often even shorter
-than a document's id), this denormalisation won't impact very strongly on the
+than a document's id), this denormalization won't impact the size of the
-size of our database. So let's take a look that the code our modified
+database very strongly. Let's take a look at the code of our modified
 :class:`Post` class::
 
     class Post(Document):
@@ -141,7 +140,7 @@ The :class:`~mongoengine.fields.ListField` object that is used to define a Post'
 takes a field object as its first argument --- this means that you can have
 lists of any type of field (including lists).
 
-.. note:: We don't need to modify the specialised post types as they all
+.. note:: We don't need to modify the specialized post types as they all
     inherit from :class:`Post`.
 
 Comments
@@ -149,7 +148,7 @@ 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
+database and then query the database again for the comments associated with the
 post. This works, but there is no real reason to be storing the comments
 separately from their associated posts, other than to work around the
 relational model. Using MongoDB we can store the comments as a list of
@@ -207,7 +206,10 @@ object::
         ross.last_name = 'Lawley'
         ross.save()
 
-Now that we've got our user in the database, let's add a couple of posts::
+Assign another user to a variable called ``john``, just like we did above with
+``ross``.
+
+Now that we've got our users in the database, let's add a couple of posts::
 
     post1 = TextPost(title='Fun with MongoEngine', author=john)
     post1.content = 'Took a look at MongoEngine today, looks pretty cool.'
@@ -219,8 +221,8 @@ Now that we've got our user in the database, let's add a couple of posts::
     post2.tags = ['mongoengine']
     post2.save()
 
-.. note:: If you change a field on a object that has already been saved, then
+.. note:: If you change a field on an object that has already been saved and
-    call :meth:`save` again, the document will be updated.
+    then call :meth:`save` again, the document will be updated.
 
 Accessing our data
 ==================
@@ -232,17 +234,17 @@ used to access the documents in the database collection associated with that
 class. So let's see how we can get our posts' titles::
 
     for post in Post.objects:
-        print post.title
+        print(post.title)
 
 Retrieving type-specific information
 ------------------------------------
 
-This will print the titles of our posts, one on each line. But What if we want
+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`::
 
     for post in TextPost.objects:
-        print post.content
+        print(post.content)
 
 Using TextPost's :attr:`objects` attribute only returns documents that were
 created using :class:`TextPost`. Actually, there is a more general rule here:
@@ -259,16 +261,14 @@ instances of :class:`Post` --- they were instances of the subclass of
 practice::
 
     for post in Post.objects:
-        print post.title
+        print(post.title)
-        print '=' * len(post.title)
+        print('=' * len(post.title))
 
         if isinstance(post, TextPost):
-            print post.content
+            print(post.content)
 
         if isinstance(post, LinkPost):
-            print 'Link:', post.link_url
+            print('Link: {}'.format(post.link_url))
-
-        print
 
 This would print the title of each post, followed by the content if it was a
 text post, and "Link: <url>" if it was a link post.
@@ -283,7 +283,7 @@ your query.  Let's adjust our query so that only posts with the tag "mongodb"
 are returned::
 
     for post in Post.objects(tags='mongodb'):
-        print post.title
+        print(post.title)
 
 There are also methods available on :class:`~mongoengine.queryset.QuerySet`
 objects that allow different results to be returned, for example, calling
@@ -292,11 +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 %d posts with tag "mongodb"' % num_posts
+    print('Found {} posts with tag "mongodb"'.format(num_posts))
 
-Learning more about mongoengine
+Learning more about MongoEngine
 -------------------------------
 
-If you got this far you've made a great start, so well done!  The next step on
+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
+your MongoEngine journey is the `full user guide <guide/index.html>`_, where
-can learn indepth about how to use mongoengine and mongodb.
+you can learn in-depth about how to use MongoEngine and MongoDB.

docs/upgrade.rst

@@ -2,6 +2,67 @@
 Upgrading
 #########
 
+Development
+***********
+(Fill this out whenever you introduce breaking changes to MongoEngine)
+
+0.13.0
+******
+This release adds Unicode support to the `EmailField` and changes its
+structure significantly. Previously, email addresses containing Unicode
+characters didn't work at all. Starting with v0.13.0, domains with Unicode
+characters are supported out of the box, meaning some emails that previously
+didn't pass validation now do. Make sure the rest of your application can
+accept such email addresses. Additionally, if you subclassed the `EmailField`
+in your application and overrode `EmailField.EMAIL_REGEX`, you will have to
+adjust your code to override `EmailField.USER_REGEX`, `EmailField.DOMAIN_REGEX`,
+and potentially `EmailField.UTF8_USER_REGEX`.
+
+0.12.0
+******
+This release includes various fixes for the `BaseQuerySet` methods and how they
+are chained together. Since version 0.10.1 applying limit/skip/hint/batch_size
+to an already-existing queryset wouldn't modify the underlying PyMongo cursor.
+This has been fixed now, so you'll need to make sure that your code didn't rely
+on the broken implementation.
+
+Additionally, a public `BaseQuerySet.clone_into` has been renamed to a private
+`_clone_into`. If you directly used that method in your code, you'll need to
+rename its occurrences.
+
+0.11.0
+******
+This release includes a major rehaul of MongoEngine's code quality and
+introduces a few breaking changes. It also touches many different parts of
+the package and although all the changes have been tested and scrutinized,
+you're encouraged to thorougly test the upgrade.
+
+First breaking change involves renaming `ConnectionError` to `MongoEngineConnectionError`.
+If you import or catch this exception, you'll need to rename it in your code.
+
+Second breaking change drops Python v2.6 support. If you run MongoEngine on
+that Python version, you'll need to upgrade it first.
+
+Third breaking change drops an old backward compatibility measure where
+`from mongoengine.base import ErrorClass` would work on top of
+`from mongoengine.errors import ErrorClass` (where `ErrorClass` is e.g.
+`ValidationError`). If you import any exceptions from `mongoengine.base`,
+change it to `mongoengine.errors`.
+
+0.10.8
+******
+This version fixed an issue where specifying a MongoDB URI host would override
+more information than it should. These changes are minor, but they still
+subtly modify the connection logic and thus you're encouraged to test your
+MongoDB connection before shipping v0.10.8 in production.
+
+0.10.7
+******
+
+`QuerySet.aggregate_sum` and `QuerySet.aggregate_average` are dropped. Use
+`QuerySet.sum` and `QuerySet.average` instead which use the aggreation framework
+by default from now on.
+
 0.9.0
 *****
 

mongoengine/__init__.py

@@ -1,25 +1,35 @@
-import connection
+# Import submodules so that we can expose their __all__
-from connection import *
+from mongoengine import connection
-import document
+from mongoengine import document
-from document import *
+from mongoengine import errors
-import errors
+from mongoengine import fields
-from errors import *
+from mongoengine import queryset
-import fields
+from mongoengine import signals
-from fields import *
-import queryset
-from queryset import *
-import signals
-from signals import *
 
-__all__ = (list(document.__all__) + fields.__all__ + connection.__all__ +
+# Import everything from each submodule so that it can be accessed via
-           list(queryset.__all__) + signals.__all__ + list(errors.__all__))
+# mongoengine, e.g. instead of `from mongoengine.connection import connect`,
+# users can simply use `from mongoengine import connect`, or even
+# `from mongoengine import *` and then `connect('testdb')`.
+from mongoengine.connection import *
+from mongoengine.document import *
+from mongoengine.errors import *
+from mongoengine.fields import *
+from mongoengine.queryset import *
+from mongoengine.signals import *
 
-VERSION = (0, 10, 7)
+
+__all__ = (list(document.__all__) + list(fields.__all__) +
+           list(connection.__all__) + list(queryset.__all__) +
+           list(signals.__all__) + list(errors.__all__))
+
+
+VERSION = (0, 13, 0)
 
 
 def get_version():
-    if isinstance(VERSION[-1], basestring):
+    """Return the VERSION as a string, e.g. for VERSION == (0, 10, 7),
-        return '.'.join(map(str, VERSION[:-1])) + VERSION[-1]
+    return '0.10.7'.
+    """
     return '.'.join(map(str, VERSION))
 
 

mongoengine/base/__init__.py

@@ -1,8 +1,28 @@
+# Base module is split into several files for convenience. Files inside of
+# this module should import from a specific submodule (e.g.
+# `from mongoengine.base.document import BaseDocument`), but all of the
+# other modules should import directly from the top-level module (e.g.
+# `from mongoengine.base import BaseDocument`). This approach is cleaner and
+# also helps with cyclical import errors.
 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
+__all__ = (
-from mongoengine.errors import *
+    # common
+    'UPDATE_OPERATORS', '_document_registry', 'get_document',
+
+    # datastructures
+    'BaseDict', 'BaseList', 'EmbeddedDocumentList',
+
+    # document
+    'BaseDocument',
+
+    # fields
+    'BaseField', 'ComplexBaseField', 'ObjectIdField', 'GeoJsonBaseField',
+
+    # metaclasses
+    'DocumentMetaclass', 'TopLevelDocumentMetaclass'
+)

mongoengine/base/common.py

@@ -1,13 +1,18 @@
 from mongoengine.errors import NotRegistered
 
-__all__ = ('ALLOW_INHERITANCE', 'get_document', '_document_registry')
+__all__ = ('UPDATE_OPERATORS', 'get_document', '_document_registry')
+
+
+UPDATE_OPERATORS = set(['set', 'unset', 'inc', 'dec', 'pop', 'push',
+                        'push_all', 'pull', 'pull_all', 'add_to_set',
+                        'set_on_insert', 'min', 'max', 'rename'])
 
-ALLOW_INHERITANCE = False
 
 _document_registry = {}
 
 
 def get_document(name):
+    """Get a document class by name."""
     doc = _document_registry.get(name, None)
     if not doc:
         # Possible old style name

mongoengine/base/datastructures.py

@@ -1,14 +1,16 @@
 import itertools
 import weakref
 
+import six
+
 from mongoengine.common import _import_class
 from mongoengine.errors import DoesNotExist, MultipleObjectsReturned
 
-__all__ = ("BaseDict", "BaseList", "EmbeddedDocumentList")
+__all__ = ('BaseDict', 'BaseList', 'EmbeddedDocumentList')
 
 
 class BaseDict(dict):
-    """A special dict so we can watch any changes"""
+    """A special dict so we can watch any changes."""
 
     _dereferenced = False
     _instance = None
@@ -93,8 +95,7 @@ class BaseDict(dict):
 
 
 class BaseList(list):
-    """A special list so we can watch any changes
+    """A special list so we can watch any changes."""
-    """
 
     _dereferenced = False
     _instance = None
@@ -137,10 +138,7 @@ class BaseList(list):
         return super(BaseList, self).__setitem__(key, value)
 
     def __delitem__(self, key, *args, **kwargs):
-        if isinstance(key, slice):
+        self._mark_as_changed()
-            self._mark_as_changed()
-        else:
-            self._mark_as_changed(key)
         return super(BaseList, self).__delitem__(key)
 
     def __setslice__(self, *args, **kwargs):
@@ -209,17 +207,22 @@ class BaseList(list):
 class EmbeddedDocumentList(BaseList):
 
     @classmethod
-    def __match_all(cls, i, kwargs):
+    def __match_all(cls, embedded_doc, kwargs):
-        items = kwargs.items()
+        """Return True if a given embedded doc matches all the filter
-        return all([
+        kwargs. If it doesn't return False.
-            getattr(i, k) == v or unicode(getattr(i, k)) == v for k, v in items
+        """
-        ])
+        for key, expected_value in kwargs.items():
+            doc_val = getattr(embedded_doc, key)
+            if doc_val != expected_value and six.text_type(doc_val) != expected_value:
+                return False
+        return True
 
     @classmethod
-    def __only_matches(cls, obj, kwargs):
+    def __only_matches(cls, embedded_docs, kwargs):
+        """Return embedded docs that match the filter kwargs."""
         if not kwargs:
-            return obj
+            return embedded_docs
-        return filter(lambda i: cls.__match_all(i, kwargs), obj)
+        return [doc for doc in embedded_docs if cls.__match_all(doc, kwargs)]
 
     def __init__(self, list_items, instance, name):
         super(EmbeddedDocumentList, self).__init__(list_items, instance, name)
@@ -285,18 +288,18 @@ class EmbeddedDocumentList(BaseList):
         values = self.__only_matches(self, kwargs)
         if len(values) == 0:
             raise DoesNotExist(
-                "%s matching query does not exist." % self._name
+                '%s matching query does not exist.' % self._name
             )
         elif len(values) > 1:
             raise MultipleObjectsReturned(
-                "%d items returned, instead of 1" % len(values)
+                '%d items returned, instead of 1' % len(values)
             )
 
         return values[0]
 
     def first(self):
-        """
+        """Return the first embedded document in the list, or ``None``
-        Returns the first embedded document in the list, or ``None`` if empty.
+        if empty.
         """
         if len(self) > 0:
             return self[0]
@@ -426,7 +429,7 @@ class StrictDict(object):
     def __eq__(self, other):
         return self.items() == other.items()
 
-    def __neq__(self, other):
+    def __ne__(self, other):
         return self.items() != other.items()
 
     @classmethod
@@ -438,7 +441,7 @@ class StrictDict(object):
                 __slots__ = allowed_keys_tuple
 
                 def __repr__(self):
-                    return "{%s}" % ', '.join('"{0!s}": {0!r}'.format(k) for k in self.iterkeys())
+                    return '{%s}' % ', '.join('"{0!s}": {1!r}'.format(k, v) for k, v in self.items())
 
             cls._classes[allowed_keys] = SpecificStrictDict
         return cls._classes[allowed_keys]

mongoengine/base/document.py

@@ -1,6 +1,5 @@
 import copy
 import numbers
-import operator
 from collections import Hashable
 from functools import partial
 
@@ -8,30 +7,27 @@ from bson import ObjectId, json_util
 from bson.dbref import DBRef
 from bson.son import SON
 import pymongo
+import six
 
 from mongoengine import signals
-from mongoengine.base.common import ALLOW_INHERITANCE, get_document
+from mongoengine.base.common import get_document
-from mongoengine.base.datastructures import (
+from mongoengine.base.datastructures import (BaseDict, BaseList,
-    BaseDict,
+                                             EmbeddedDocumentList,
-    BaseList,
+                                             SemiStrictDict, StrictDict)
-    EmbeddedDocumentList,
-    SemiStrictDict,
-    StrictDict
-)
 from mongoengine.base.fields import ComplexBaseField
 from mongoengine.common import _import_class
 from mongoengine.errors import (FieldDoesNotExist, InvalidDocumentError,
-                                LookUpError, ValidationError)
+                                LookUpError, OperationError, ValidationError)
-from mongoengine.python_support import PY3, txt_type
 
-__all__ = ('BaseDocument', 'NON_FIELD_ERRORS')
+__all__ = ('BaseDocument',)
 
 NON_FIELD_ERRORS = '__all__'
 
 
 class BaseDocument(object):
     __slots__ = ('_changed_fields', '_initialised', '_created', '_data',
-                 '_dynamic_fields', '_auto_id_field', '_db_field_map', '__weakref__')
+                 '_dynamic_fields', '_auto_id_field', '_db_field_map',
+                 '__weakref__')
 
     _dynamic = False
     _dynamic_lock = True
@@ -57,15 +53,15 @@ class BaseDocument(object):
                 name = next(field)
                 if name in values:
                     raise TypeError(
-                        "Multiple values for keyword argument '" + name + "'")
+                        'Multiple values for keyword argument "%s"' % name)
                 values[name] = value
 
-        __auto_convert = values.pop("__auto_convert", True)
+        __auto_convert = values.pop('__auto_convert', True)
 
         # 399: set default values only to fields loaded from DB
-        __only_fields = set(values.pop("__only_fields", values))
+        __only_fields = set(values.pop('__only_fields', values))
 
-        _created = values.pop("_created", True)
+        _created = values.pop('_created', True)
 
         signals.pre_init.send(self.__class__, document=self, values=values)
 
@@ -76,7 +72,7 @@ class BaseDocument(object):
                 self._fields.keys() + ['id', 'pk', '_cls', '_text_score'])
             if _undefined_fields:
                 msg = (
-                    "The fields '{0}' do not exist on the document '{1}'"
+                    'The fields "{0}" do not exist on the document "{1}"'
                 ).format(_undefined_fields, self._class_name)
                 raise FieldDoesNotExist(msg)
 
@@ -95,7 +91,7 @@ class BaseDocument(object):
             value = getattr(self, key, None)
             setattr(self, key, value)
 
-        if "_cls" not in values:
+        if '_cls' not in values:
             self._cls = self._class_name
 
         # Set passed values after initialisation
@@ -121,7 +117,7 @@ class BaseDocument(object):
                 else:
                     self._data[key] = value
 
-        # Set any get_fieldname_display methods
+        # Set any get_<field>_display methods
         self.__set_field_display()
 
         if self._dynamic:
@@ -150,7 +146,7 @@ class BaseDocument(object):
         if self._dynamic and not self._dynamic_lock:
 
             if not hasattr(self, name) and not name.startswith('_'):
-                DynamicField = _import_class("DynamicField")
+                DynamicField = _import_class('DynamicField')
                 field = DynamicField(db_field=name)
                 field.name = name
                 self._dynamic_fields[name] = field
@@ -169,11 +165,13 @@ class BaseDocument(object):
         except AttributeError:
             self__created = True
 
-        if (self._is_document and not self__created and
+        if (
-                name in self._meta.get('shard_key', tuple()) and
+            self._is_document and
-                self._data.get(name) != value):
+            not self__created and
-            OperationError = _import_class('OperationError')
+            name in self._meta.get('shard_key', tuple()) and
-            msg = "Shard Keys are immutable. Tried to update %s" % name
+            self._data.get(name) != value
+        ):
+            msg = 'Shard Keys are immutable. Tried to update %s' % name
             raise OperationError(msg)
 
         try:
@@ -197,8 +195,8 @@ class BaseDocument(object):
         return data
 
     def __setstate__(self, data):
-        if isinstance(data["_data"], SON):
+        if isinstance(data['_data'], SON):
-            data["_data"] = self.__class__._from_son(data["_data"])._data
+            data['_data'] = self.__class__._from_son(data['_data'])._data
         for k in ('_changed_fields', '_initialised', '_created', '_data',
                   '_dynamic_fields'):
             if k in data:
@@ -212,7 +210,7 @@ class BaseDocument(object):
 
         dynamic_fields = data.get('_dynamic_fields') or SON()
         for k in dynamic_fields.keys():
-            setattr(self, k, data["_data"].get(k))
+            setattr(self, k, data['_data'].get(k))
 
     def __iter__(self):
         return iter(self._fields_ordered)
@@ -254,12 +252,13 @@ class BaseDocument(object):
         return repr_type('<%s: %s>' % (self.__class__.__name__, u))
 
     def __str__(self):
+        # TODO this could be simpler?
         if hasattr(self, '__unicode__'):
-            if PY3:
+            if six.PY3:
                 return self.__unicode__()
             else:
-                return unicode(self).encode('utf-8')
+                return six.text_type(self).encode('utf-8')
-        return txt_type('%s object' % self.__class__.__name__)
+        return six.text_type('%s object' % self.__class__.__name__)
 
     def __eq__(self, other):
         if isinstance(other, self.__class__) and hasattr(other, 'id') and other.id is not None:
@@ -273,13 +272,6 @@ class BaseDocument(object):
     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.
@@ -308,7 +300,7 @@ class BaseDocument(object):
             fields = []
 
         data = SON()
-        data["_id"] = None
+        data['_id'] = None
         data['_cls'] = self._class_name
 
         # only root fields ['test1.a', 'test2'] => ['test1', 'test2']
@@ -351,18 +343,8 @@ class BaseDocument(object):
                 else:
                     data[field.name] = 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
+        if not self._meta.get('allow_inheritance'):
-                not self._meta.get('allow_inheritance', ALLOW_INHERITANCE)):
             data.pop('_cls')
 
         return data
@@ -376,16 +358,16 @@ class BaseDocument(object):
         if clean:
             try:
                 self.clean()
-            except ValidationError, error:
+            except ValidationError as 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")
+        EmbeddedDocumentField = _import_class('EmbeddedDocumentField')
         GenericEmbeddedDocumentField = _import_class(
-            "GenericEmbeddedDocumentField")
+            'GenericEmbeddedDocumentField')
 
         for field, value in fields:
             if value is not None:
@@ -395,27 +377,29 @@ class BaseDocument(object):
                         field._validate(value, clean=clean)
                     else:
                         field._validate(value)
-                except ValidationError, error:
+                except ValidationError as error:
                     errors[field.name] = error.errors or error
-                except (ValueError, AttributeError, AssertionError), error:
+                except (ValueError, AttributeError, AssertionError) as 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"
+            pk = 'None'
             if hasattr(self, 'pk'):
                 pk = self.pk
             elif self._instance and hasattr(self._instance, 'pk'):
                 pk = self._instance.pk
-            message = "ValidationError (%s:%s) " % (self._class_name, 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.
+        """Convert this document to JSON.
-        :param use_db_field: Set to True by default but enables the output of the json structure with the field names
+
-            and not the mongodb store db_names in case of set to False
+        :param use_db_field: Serialize field names as they appear in
+            MongoDB (as opposed to attribute names on this document).
+            Defaults to True.
         """
         use_db_field = kwargs.pop('use_db_field', True)
         return json_util.dumps(self.to_mongo(use_db_field), *args, **kwargs)
@@ -426,33 +410,26 @@ class BaseDocument(object):
         return cls._from_son(json_util.loads(json_data), created=created)
 
     def __expand_dynamic_values(self, name, value):
-        """expand any dynamic values to their correct types / values"""
+        """Expand any dynamic values to their correct types / values."""
         if not isinstance(value, (dict, list, tuple)):
             return value
 
-        EmbeddedDocumentListField = _import_class('EmbeddedDocumentListField')
+        # If the value is a dict with '_cls' in it, turn it into a document
-
+        is_dict = isinstance(value, dict)
-        is_list = False
+        if is_dict and '_cls' in value:
-        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 = {}
+        if is_dict:
-        for k, v in value.items():
+            value = {
-            key = name if is_list else k
+                k: self.__expand_dynamic_values(k, v)
-            data[k] = self.__expand_dynamic_values(key, v)
+                for k, v in value.items()
-
+            }
-        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
+            value = [self.__expand_dynamic_values(name, v) for v in value]
 
         # Convert lists / values so we can watch for any changes on them
+        EmbeddedDocumentListField = _import_class('EmbeddedDocumentListField')
         if (isinstance(value, (list, tuple)) and
                 not isinstance(value, BaseList)):
             if issubclass(type(self), EmbeddedDocumentListField):
@@ -465,8 +442,7 @@ class BaseDocument(object):
         return value
 
     def _mark_as_changed(self, key):
-        """Marks a key as explicitly changed by the user
+        """Mark a key as explicitly changed by the user."""
-        """
         if not key:
             return
 
@@ -496,10 +472,11 @@ class BaseDocument(object):
                         remove(field)
 
     def _clear_changed_fields(self):
-        """Using get_changed_fields iterate and remove any fields that are
+        """Using _get_changed_fields iterate and remove any fields that
-        marked as changed"""
+        are marked as changed.
+        """
         for changed in self._get_changed_fields():
-            parts = changed.split(".")
+            parts = changed.split('.')
             data = self
             for part in parts:
                 if isinstance(data, list):
@@ -511,10 +488,13 @@ class BaseDocument(object):
                     data = data.get(part, None)
                 else:
                     data = getattr(data, part, None)
-                if hasattr(data, "_changed_fields"):
+
-                    if hasattr(data, "_is_document") and data._is_document:
+                if hasattr(data, '_changed_fields'):
+                    if getattr(data, '_is_document', False):
                         continue
+
                     data._changed_fields = []
+
         self._changed_fields = []
 
     def _nestable_types_changed_fields(self, changed_fields, key, data, inspected):
@@ -526,26 +506,27 @@ class BaseDocument(object):
             iterator = data.iteritems()
 
         for index, value in iterator:
-            list_key = "%s%s." % (key, index)
+            list_key = '%s%s.' % (key, index)
             # don't check anything lower if this key is already marked
             # as changed.
             if list_key[:-1] in changed_fields:
                 continue
             if hasattr(value, '_get_changed_fields'):
                 changed = value._get_changed_fields(inspected)
-                changed_fields += ["%s%s" % (list_key, k)
+                changed_fields += ['%s%s' % (list_key, k)
                                    for k in changed if k]
             elif isinstance(value, (list, tuple, dict)):
                 self._nestable_types_changed_fields(
                     changed_fields, list_key, value, inspected)
 
     def _get_changed_fields(self, inspected=None):
-        """Returns a list of all fields that have explicitly been changed.
+        """Return a list of all fields that have explicitly been changed.
         """
-        EmbeddedDocument = _import_class("EmbeddedDocument")
+        EmbeddedDocument = _import_class('EmbeddedDocument')
-        DynamicEmbeddedDocument = _import_class("DynamicEmbeddedDocument")
+        DynamicEmbeddedDocument = _import_class('DynamicEmbeddedDocument')
-        ReferenceField = _import_class("ReferenceField")
+        ReferenceField = _import_class('ReferenceField')
-        SortedListField = _import_class("SortedListField")
+        SortedListField = _import_class('SortedListField')
+
         changed_fields = []
         changed_fields += getattr(self, '_changed_fields', [])
 
@@ -572,7 +553,7 @@ class BaseDocument(object):
             ):
                 # 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]
+                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):
                 if (hasattr(field, 'field') and
@@ -676,21 +657,33 @@ class BaseDocument(object):
 
     @classmethod
     def _get_collection_name(cls):
-        """Returns the collection name for this class. None for abstract class
+        """Return the collection name for this class. None for abstract
+        class.
         """
         return cls._meta.get('collection', None)
 
     @classmethod
     def _from_son(cls, son, _auto_dereference=True, only_fields=None, created=False):
-        """Create an instance of a Document (subclass) from a PyMongo SON.
+        """Create an instance of a Document (subclass) from a PyMongo
+        SON.
         """
         if not only_fields:
             only_fields = []
 
-        # get the class name from the document, falling back to the given
+        if son and not isinstance(son, dict):
+            raise ValueError("The source SON object needs to be of type 'dict'")
+
+        # 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())
+
+        # Convert SON to a data dict, making sure each key is a string and
+        # corresponds to the right db field.
+        data = {}
+        for key, value in son.iteritems():
+            key = str(key)
+            key = cls._db_field_map.get(key, key)
+            data[key] = value
 
         # Return correct subclass for document type
         if class_name != cls._class_name:
@@ -712,19 +705,20 @@ class BaseDocument(object):
                                         else field.to_python(value))
                     if field_name != field.db_field:
                         del data[field.db_field]
-                except (AttributeError, ValueError), e:
+                except (AttributeError, ValueError) as e:
                     errors_dict[field_name] = e
 
         if errors_dict:
-            errors = "\n".join(["%s - %s" % (k, v)
+            errors = '\n'.join(['%s - %s' % (k, v)
                                 for k, v in errors_dict.items()])
-            msg = ("Invalid data to create a `%s` instance.\n%s"
+            msg = ('Invalid data to create a `%s` instance.\n%s'
                    % (cls._class_name, errors))
             raise InvalidDocumentError(msg)
 
+        # In STRICT documents, remove any keys that aren't in cls._fields
         if cls.STRICT:
-            data = dict((k, v)
+            data = {k: v for k, v in data.iteritems() if k in cls._fields}
-                        for k, v in data.iteritems() if k in cls._fields)
+
         obj = cls(__auto_convert=False, _created=created, __only_fields=only_fields, **data)
         obj._changed_fields = changed_fields
         if not _auto_dereference:
@@ -734,37 +728,43 @@ class BaseDocument(object):
 
     @classmethod
     def _build_index_specs(cls, meta_indexes):
-        """Generate and merge the full index specs
+        """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)
+        index_specs = [cls._build_index_spec(spec) for spec in meta_indexes]
-                       for spec in meta_indexes]
 
         def merge_index_specs(index_specs, indices):
+            """Helper method for merging index specs."""
             if not indices:
                 return index_specs
 
-            spec_fields = [v['fields']
+            # Create a map of index fields to index spec. We're converting
-                           for k, v in enumerate(index_specs)]
+            # the fields from a list to a tuple so that it's hashable.
-            # Merge unique_indexes with existing specs
+            spec_fields = {
-            for k, v in enumerate(indices):
+                tuple(index['fields']): index for index in index_specs
-                if v['fields'] in spec_fields:
+            }
-                    index_specs[spec_fields.index(v['fields'])].update(v)
+
+            # For each new index, if there's an existing index with the same
+            # fields list, update the existing spec with all data from the
+            # new spec.
+            for new_index in indices:
+                candidate = spec_fields.get(tuple(new_index['fields']))
+                if candidate is None:
+                    index_specs.append(new_index)
                 else:
-                    index_specs.append(v)
+                    candidate.update(new_index)
+
             return index_specs
 
+        # Merge geo indexes and unique_with indexes into the meta 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.
+        """Build a PyMongo index spec from a MongoEngine index spec."""
-        """
+        if isinstance(spec, six.string_types):
-        if isinstance(spec, basestring):
             spec = {'fields': [spec]}
         elif isinstance(spec, (list, tuple)):
             spec = {'fields': list(spec)}
@@ -775,8 +775,7 @@ class BaseDocument(object):
         direction = None
 
         # Check to see if we need to include _cls
-        allow_inheritance = cls._meta.get('allow_inheritance',
+        allow_inheritance = cls._meta.get('allow_inheritance')
-                                          ALLOW_INHERITANCE)
         include_cls = (
             allow_inheritance and
             not spec.get('sparse', False) and
@@ -786,7 +785,7 @@ class BaseDocument(object):
 
         # 733: don't include cls if index_cls is False unless there is an explicit cls with the index
         include_cls = include_cls and (spec.get('cls', False) or cls._meta.get('index_cls', True))
-        if "cls" in spec:
+        if 'cls' in spec:
             spec.pop('cls')
         for key in spec['fields']:
             # If inherited spec continue
@@ -801,19 +800,19 @@ class BaseDocument(object):
             # GEOHAYSTACK from )
             # GEO2D from *
             direction = pymongo.ASCENDING
-            if key.startswith("-"):
+            if key.startswith('-'):
                 direction = pymongo.DESCENDING
-            elif key.startswith("$"):
+            elif key.startswith('$'):
                 direction = pymongo.TEXT
-            elif key.startswith("#"):
+            elif key.startswith('#'):
                 direction = pymongo.HASHED
-            elif key.startswith("("):
+            elif key.startswith('('):
                 direction = pymongo.GEOSPHERE
-            elif key.startswith(")"):
+            elif key.startswith(')'):
                 direction = pymongo.GEOHAYSTACK
-            elif key.startswith("*"):
+            elif key.startswith('*'):
                 direction = pymongo.GEO2D
-            if key.startswith(("+", "-", "*", "$", "#", "(", ")")):
+            if key.startswith(('+', '-', '*', '$', '#', '(', ')')):
                 key = key[1:]
 
             # Use real field name, do it manually because we need field
@@ -826,7 +825,7 @@ class BaseDocument(object):
                 parts = []
                 for field in fields:
                     try:
-                        if field != "_id":
+                        if field != '_id':
                             field = field.db_field
                     except AttributeError:
                         pass
@@ -845,49 +844,53 @@ class BaseDocument(object):
         return spec
 
     @classmethod
-    def _unique_with_indexes(cls, namespace=""):
+    def _unique_with_indexes(cls, namespace=''):
-        """
+        """Find unique indexes in the document schema and return them."""
-        Find and set unique indexes
-        """
         unique_indexes = []
         for field_name, field in cls._fields.items():
             sparse = field.sparse
+
             # Generate a list of indexes needed by uniqueness constraints
             if field.unique:
                 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):
+                    if isinstance(field.unique_with, six.string_types):
                         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)
+                fields = [
-                          for f in unique_fields]
+                    ('%s%s' % (namespace, f), pymongo.ASCENDING)
+                    for f in unique_fields
+                ]
                 index = {'fields': fields, 'unique': True, 'sparse': sparse}
                 unique_indexes.append(index)
 
-            if field.__class__.__name__ == "ListField":
+            if field.__class__.__name__ == 'ListField':
                 field = field.field
 
             # Grab any embedded document field unique indexes
-            if (field.__class__.__name__ == "EmbeddedDocumentField" and
+            if (field.__class__.__name__ == 'EmbeddedDocumentField' and
                     field.document_type != cls):
-                field_namespace = "%s." % field_name
+                field_namespace = '%s.' % field_name
                 doc_cls = field.document_type
                 unique_indexes += doc_cls._unique_with_indexes(field_namespace)
 
@@ -899,8 +902,9 @@ class BaseDocument(object):
         geo_indices = []
         inspected.append(cls)
 
-        geo_field_type_names = ["EmbeddedDocumentField", "GeoPointField",
+        geo_field_type_names = ('EmbeddedDocumentField', 'GeoPointField',
-                                "PointField", "LineStringField", "PolygonField"]
+                                'PointField', 'LineStringField',
+                                'PolygonField')
 
         geo_field_types = tuple([_import_class(field)
                                  for field in geo_field_type_names])
@@ -908,32 +912,68 @@ class BaseDocument(object):
         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)
+                    field_name = '%s.%s' % (parent_field, field_name)
-                geo_indices.append({'fields':
+                geo_indices.append({
-                                    [(field_name, field._geo_index)]})
+                    '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
+        """Given the path to a given field, return a list containing
-        the field's parents and the field.
+        the Field object associated with that field and all of its parent
-        """
+        Field objects.
 
-        ListField = _import_class("ListField")
+        Args:
+            parts (str, list, or tuple) - path to the field. Should be a
+            string for simple fields existing on this document or a list
+            of strings for a field that exists deeper in embedded documents.
+
+        Returns:
+            A list of Field instances for fields that were found or
+            strings for sub-fields that weren't.
+
+        Example:
+            >>> user._lookup_field('name')
+            [<mongoengine.fields.StringField at 0x1119bff50>]
+
+            >>> user._lookup_field('roles')
+            [<mongoengine.fields.EmbeddedDocumentListField at 0x1119ec250>]
+
+            >>> user._lookup_field(['roles', 'role'])
+            [<mongoengine.fields.EmbeddedDocumentListField at 0x1119ec250>,
+             <mongoengine.fields.StringField at 0x1119ec050>]
+
+            >>> user._lookup_field('doesnt_exist')
+            raises LookUpError
+
+            >>> user._lookup_field(['roles', 'doesnt_exist'])
+            [<mongoengine.fields.EmbeddedDocumentListField at 0x1119ec250>,
+             'doesnt_exist']
+
+        """
+        # TODO this method is WAY too complicated. Simplify it.
+        # TODO don't think returning a string for embedded non-existent fields is desired
+
+        ListField = _import_class('ListField')
         DynamicField = _import_class('DynamicField')
 
         if not isinstance(parts, (list, tuple)):
             parts = [parts]
+
         fields = []
         field = None
 
@@ -943,16 +983,17 @@ class BaseDocument(object):
                 fields.append(field_name)
                 continue
 
+            # Look up first field from the document
             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:
                     field = DynamicField(db_field=field_name)
-                elif cls._meta.get("allow_inheritance", False) or cls._meta.get("abstract", False):
+                elif cls._meta.get('allow_inheritance') or cls._meta.get('abstract', False):
                     # 744: in case the field is defined in a subclass
                     for subcls in cls.__subclasses__():
                         try:
@@ -965,35 +1006,55 @@ class BaseDocument(object):
                     else:
                         raise LookUpError('Cannot resolve field "%s"' % field_name)
                 else:
-                    raise LookUpError('Cannot resolve field "%s"'
+                    raise LookUpError('Cannot resolve field "%s"' % field_name)
-                                      % field_name)
             else:
                 ReferenceField = _import_class('ReferenceField')
                 GenericReferenceField = _import_class('GenericReferenceField')
+
+                # If previous field was a reference, throw an error (we
+                # cannot look up fields that are on references).
                 if isinstance(field, (ReferenceField, GenericReferenceField)):
                     raise LookUpError('Cannot perform join in mongoDB: %s' %
                                       '__'.join(parts))
+
+                # If the parent field has a "field" attribute which has a
+                # lookup_member method, call it to find the field
+                # corresponding to this iteration.
                 if hasattr(getattr(field, 'field', None), 'lookup_member'):
                     new_field = field.field.lookup_member(field_name)
+
+                # If the parent field is a DynamicField or if it's part of
+                # a DynamicDocument, mark current field as a DynamicField
+                # with db_name equal to the field name.
                 elif cls._dynamic and (isinstance(field, DynamicField) or
                                        getattr(getattr(field, 'document_type', None), '_dynamic', None)):
                     new_field = DynamicField(db_field=field_name)
+
+                # Else, try to use the parent field's lookup_member method
+                # to find the subfield.
+                elif hasattr(field, 'lookup_member'):
+                    new_field = field.lookup_member(field_name)
+
+                # Raise a LookUpError if all the other conditions failed.
                 else:
-                    # Look up subfield on the previous field or raise
+                    raise LookUpError(
-                    try:
+                        'Cannot resolve subfield or operator {} '
-                        new_field = field.lookup_member(field_name)
+                        'on the field {}'.format(field_name, field.name)
-                    except AttributeError:
+                    )
-                        raise LookUpError('Cannot resolve subfield or operator {} '
+
-                                          'on the field {}'.format(
+                # If current field still wasn't found and the parent field
-                                              field_name, field.name))
+                # is a ComplexBaseField, add the name current field name and
+                # move on.
                 if not new_field and isinstance(field, ComplexBaseField):
                     fields.append(field_name)
                     continue
                 elif not new_field:
-                    raise LookUpError('Cannot resolve field "%s"'
+                    raise LookUpError('Cannot resolve field "%s"' % field_name)
-                                      % field_name)
+
                 field = new_field  # update field to the new field type
+
             fields.append(field)
+
         return fields
 
     @classmethod
@@ -1005,19 +1066,18 @@ class BaseDocument(object):
         return '.'.join(parts)
 
     def __set_field_display(self):
-        """Dynamically set the display value for a field with choices"""
+        """For each field that specifies choices, create a
-        for attr_name, field in self._fields.items():
+        get_<field>_display method.
-            if field.choices:
+        """
-                if self._dynamic:
+        fields_with_choices = [(n, f) for n, f in self._fields.items()
-                    obj = self
+                               if f.choices]
-                else:
+        for attr_name, field in fields_with_choices:
-                    obj = type(self)
+            setattr(self,
-                setattr(obj,
+                    'get_%s_display' % attr_name,
-                        'get_%s_display' % attr_name,
+                    partial(self.__get_field_display, field=field))
-                        partial(self.__get_field_display, field=field))
 
     def __get_field_display(self, field):
-        """Returns the display value for a choice field"""
+        """Return 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)

mongoengine/base/fields.py

@@ -4,21 +4,17 @@ import weakref
 
 from bson import DBRef, ObjectId, SON
 import pymongo
+import six
 
-from mongoengine.base.common import ALLOW_INHERITANCE
+from mongoengine.base.common import UPDATE_OPERATORS
-from mongoengine.base.datastructures import (
+from mongoengine.base.datastructures import (BaseDict, BaseList,
-    BaseDict, BaseList, EmbeddedDocumentList
+                                             EmbeddedDocumentList)
-)
 from mongoengine.common import _import_class
 from mongoengine.errors import ValidationError
 
-__all__ = ("BaseField", "ComplexBaseField",
-           "ObjectIdField", "GeoJsonBaseField")
 
-
+__all__ = ('BaseField', 'ComplexBaseField', 'ObjectIdField',
-UPDATE_OPERATORS = set(['set', 'unset', 'inc', 'dec', 'pop', 'push',
+           'GeoJsonBaseField')
-                        'push_all', 'pull', 'pull_all', 'add_to_set',
-                        'set_on_insert', 'min', 'max'])
 
 
 class BaseField(object):
@@ -27,7 +23,6 @@ class BaseField(object):
 
     .. versionchanged:: 0.5 - added verbose and help text
     """
-
     name = None
     _geo_index = False
     _auto_gen = False  # Call `generate` to generate a value
@@ -46,7 +41,7 @@ class BaseField(object):
         """
         :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 name: Deprecated - 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
@@ -73,7 +68,7 @@ class BaseField(object):
         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'"
+            msg = 'Field\'s "name" attribute deprecated in favour of "db_field"'
             warnings.warn(msg, DeprecationWarning)
         self.required = required or primary_key
         self.default = default
@@ -86,10 +81,28 @@ class BaseField(object):
         self.sparse = sparse
         self._owner_document = None
 
+        # Make sure db_field is a string (if it's explicitly defined).
+        if (
+            self.db_field is not None and
+            not isinstance(self.db_field, six.string_types)
+        ):
+            raise TypeError('db_field should be a string.')
+
+        # Make sure db_field doesn't contain any forbidden characters.
+        if isinstance(self.db_field, six.string_types) and (
+            '.' in self.db_field or
+            '\0' in self.db_field or
+            self.db_field.startswith('$')
+        ):
+            raise ValueError(
+                'field names cannot contain dots (".") or null characters '
+                '("\\0"), and they must not start with a dollar sign ("$").'
+            )
+
         # Detect and report conflicts between metadata and base properties.
         conflicts = set(dir(self)) & set(kwargs)
         if conflicts:
-            raise TypeError("%s already has attribute(s): %s" % (
+            raise TypeError('%s already has attribute(s): %s' % (
                 self.__class__.__name__, ', '.join(conflicts)))
 
         # Assign metadata to the instance
@@ -147,25 +160,21 @@ class BaseField(object):
                     v._instance = weakref.proxy(instance)
         instance._data[self.name] = value
 
-    def error(self, message="", errors=None, field_name=None):
+    def error(self, message='', errors=None, field_name=None):
-        """Raises a ValidationError.
+        """Raise 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.
+        """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.
+        """Convert a Python type to a MongoDB-compatible type."""
-        """
         return self.to_python(value)
 
     def _to_mongo_safe_call(self, value, use_db_field=True, fields=None):
-        """A helper method to call to_mongo with proper inputs
+        """Helper method to call to_mongo with proper inputs."""
-        """
         f_inputs = self.to_mongo.__code__.co_varnames
         ex_vars = {}
         if 'fields' in f_inputs:
@@ -177,15 +186,13 @@ class BaseField(object):
         return self.to_mongo(value, **ex_vars)
 
     def prepare_query_value(self, op, value):
-        """Prepare a value that is being used in a query for PyMongo.
+        """Prepare a value that is being used in a query for PyMongo."""
-        """
         if op in UPDATE_OPERATORS:
             self.validate(value)
         return value
 
     def validate(self, value, clean=True):
-        """Perform validation on a value.
+        """Perform validation on a value."""
-        """
         pass
 
     def _validate_choices(self, value):
@@ -193,18 +200,21 @@ class BaseField(object):
         EmbeddedDocument = _import_class('EmbeddedDocument')
 
         choice_list = self.choices
-        if isinstance(choice_list[0], (list, tuple)):
+        if isinstance(next(iter(choice_list)), (list, tuple)):
+            # next(iter) is useful for sets
             choice_list = [k for k, _ in choice_list]
 
         # Choices which are other types of Documents
         if isinstance(value, (Document, EmbeddedDocument)):
             if not any(isinstance(value, c) for c in choice_list):
                 self.error(
-                    'Value must be instance of %s' % unicode(choice_list)
+                    'Value must be an instance of %s' % (
+                        six.text_type(choice_list)
+                    )
                 )
         # Choices which are types other than Documents
         elif value not in choice_list:
-            self.error('Value must be one of %s' % unicode(choice_list))
+            self.error('Value must be one of %s' % six.text_type(choice_list))
 
     def _validate(self, value, **kwargs):
         # Check the Choices Constraint
@@ -247,8 +257,7 @@ class ComplexBaseField(BaseField):
     field = None
 
     def __get__(self, instance, owner):
-        """Descriptor to automatically dereference references.
+        """Descriptor to automatically dereference references."""
-        """
         if instance is None:
             # Document class being used rather than a document object
             return self
@@ -260,7 +269,7 @@ class ComplexBaseField(BaseField):
                        (self.field is None or isinstance(self.field,
                                                          (GenericReferenceField, ReferenceField))))
 
-        _dereference = _import_class("DeReference")()
+        _dereference = _import_class('DeReference')()
 
         self._auto_dereference = instance._fields[self.name]._auto_dereference
         if instance._initialised and dereference and instance._data.get(self.name):
@@ -295,9 +304,8 @@ class ComplexBaseField(BaseField):
         return value
 
     def to_python(self, value):
-        """Convert a MongoDB-compatible type to a Python type.
+        """Convert a MongoDB-compatible type to a Python type."""
-        """
+        if isinstance(value, six.string_types):
-        if isinstance(value, basestring):
             return value
 
         if hasattr(value, 'to_python'):
@@ -307,14 +315,14 @@ class ComplexBaseField(BaseField):
         if not hasattr(value, 'items'):
             try:
                 is_list = True
-                value = dict([(k, v) for k, v in enumerate(value)])
+                value = {k: v for k, v in enumerate(value)}
             except TypeError:  # Not iterable return the value
                 return value
 
         if self.field:
             self.field._auto_dereference = self._auto_dereference
-            value_dict = dict([(key, self.field.to_python(item))
+            value_dict = {key: self.field.to_python(item)
-                               for key, item in value.items()])
+                          for key, item in value.items()}
         else:
             Document = _import_class('Document')
             value_dict = {}
@@ -337,13 +345,12 @@ class ComplexBaseField(BaseField):
         return value_dict
 
     def to_mongo(self, value, use_db_field=True, fields=None):
-        """Convert a Python type to a MongoDB-compatible type.
+        """Convert a Python type to a MongoDB-compatible type."""
-        """
+        Document = _import_class('Document')
-        Document = _import_class("Document")
+        EmbeddedDocument = _import_class('EmbeddedDocument')
-        EmbeddedDocument = _import_class("EmbeddedDocument")
+        GenericReferenceField = _import_class('GenericReferenceField')
-        GenericReferenceField = _import_class("GenericReferenceField")
 
-        if isinstance(value, basestring):
+        if isinstance(value, six.string_types):
             return value
 
         if hasattr(value, 'to_mongo'):
@@ -360,13 +367,15 @@ class ComplexBaseField(BaseField):
         if not hasattr(value, 'items'):
             try:
                 is_list = True
-                value = dict([(k, v) for k, v in enumerate(value)])
+                value = {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_safe_call(item, use_db_field, fields))
+            value_dict = {
-                               for key, item in value.iteritems()])
+                key: self.field._to_mongo_safe_call(item, use_db_field, fields)
+                for key, item in value.iteritems()
+            }
         else:
             value_dict = {}
             for k, v in value.iteritems():
@@ -380,9 +389,7 @@ class ComplexBaseField(BaseField):
                     # any _cls data so make it a generic reference allows
                     # us to dereference
                     meta = getattr(v, '_meta', {})
-                    allow_inheritance = (
+                    allow_inheritance = meta.get('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:
@@ -404,8 +411,7 @@ class ComplexBaseField(BaseField):
         return value_dict
 
     def validate(self, value):
-        """If field is provided ensure the value is valid.
+        """If field is provided ensure the value is valid."""
-        """
         errors = {}
         if self.field:
             if hasattr(value, 'iteritems') or hasattr(value, 'items'):
@@ -415,9 +421,9 @@ class ComplexBaseField(BaseField):
             for k, v in sequence:
                 try:
                     self.field._validate(v)
-                except ValidationError, error:
+                except ValidationError as error:
                     errors[k] = error.errors or error
-                except (ValueError, AssertionError), error:
+                except (ValueError, AssertionError) as error:
                     errors[k] = error
 
             if errors:
@@ -443,8 +449,7 @@ class ComplexBaseField(BaseField):
 
 
 class ObjectIdField(BaseField):
-    """A field wrapper around MongoDB's ObjectIds.
+    """A field wrapper around MongoDB's ObjectIds."""
-    """
 
     def to_python(self, value):
         try:
@@ -457,10 +462,10 @@ class ObjectIdField(BaseField):
     def to_mongo(self, value):
         if not isinstance(value, ObjectId):
             try:
-                return ObjectId(unicode(value))
+                return ObjectId(six.text_type(value))
-            except Exception, e:
+            except Exception as e:
                 # e.message attribute has been deprecated since Python 2.6
-                self.error(unicode(e))
+                self.error(six.text_type(e))
         return value
 
     def prepare_query_value(self, op, value):
@@ -468,7 +473,7 @@ class ObjectIdField(BaseField):
 
     def validate(self, value):
         try:
-            ObjectId(unicode(value))
+            ObjectId(six.text_type(value))
         except Exception:
             self.error('Invalid Object ID')
 
@@ -480,21 +485,20 @@ class GeoJsonBaseField(BaseField):
     """
 
     _geo_index = pymongo.GEOSPHERE
-    _type = "GeoBase"
+    _type = 'GeoBase'
 
     def __init__(self, auto_index=True, *args, **kwargs):
         """
-        :param bool auto_index: Automatically create a "2dsphere" index.\
+        :param bool auto_index: Automatically create a '2dsphere' index.\
             Defaults to `True`.
         """
-        self._name = "%sField" % self._type
+        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
+        """Validate the GeoJson object based on its type."""
-        """
         if isinstance(value, dict):
             if set(value.keys()) == set(['type', 'coordinates']):
                 if value['type'] != self._type:
@@ -509,7 +513,7 @@ class GeoJsonBaseField(BaseField):
             self.error('%s can only accept lists of [x, y]' % self._name)
             return
 
-        validate = getattr(self, "_validate_%s" % self._type.lower())
+        validate = getattr(self, '_validate_%s' % self._type.lower())
         error = validate(value)
         if error:
             self.error(error)
@@ -522,7 +526,7 @@ class GeoJsonBaseField(BaseField):
         try:
             value[0][0][0]
         except (TypeError, IndexError):
-            return "Invalid Polygon must contain at least one valid linestring"
+            return 'Invalid Polygon must contain at least one valid linestring'
 
         errors = []
         for val in value:
@@ -533,12 +537,12 @@ class GeoJsonBaseField(BaseField):
                 errors.append(error)
         if errors:
             if top_level:
-                return "Invalid Polygon:\n%s" % ", ".join(errors)
+                return 'Invalid Polygon:\n%s' % ', '.join(errors)
             else:
-                return "%s" % ", ".join(errors)
+                return '%s' % ', '.join(errors)
 
     def _validate_linestring(self, value, top_level=True):
-        """Validates a linestring"""
+        """Validate a linestring."""
         if not isinstance(value, (list, tuple)):
             return 'LineStrings must contain list of coordinate pairs'
 
@@ -546,7 +550,7 @@ class GeoJsonBaseField(BaseField):
         try:
             value[0][0]
         except (TypeError, IndexError):
-            return "Invalid LineString must contain at least one valid point"
+            return 'Invalid LineString must contain at least one valid point'
 
         errors = []
         for val in value:
@@ -555,19 +559,19 @@ class GeoJsonBaseField(BaseField):
                 errors.append(error)
         if errors:
             if top_level:
-                return "Invalid LineString:\n%s" % ", ".join(errors)
+                return 'Invalid LineString:\n%s' % ', '.join(errors)
             else:
-                return "%s" % ", ".join(errors)
+                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)
+            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)
+            return 'Both values (%s) in point must be float or int' % repr(value)
 
     def _validate_multipoint(self, value):
         if not isinstance(value, (list, tuple)):
@@ -577,7 +581,7 @@ class GeoJsonBaseField(BaseField):
         try:
             value[0][0]
         except (TypeError, IndexError):
-            return "Invalid MultiPoint must contain at least one valid point"
+            return 'Invalid MultiPoint must contain at least one valid point'
 
         errors = []
         for point in value:
@@ -586,7 +590,7 @@ class GeoJsonBaseField(BaseField):
                 errors.append(error)
 
         if errors:
-            return "%s" % ", ".join(errors)
+            return '%s' % ', '.join(errors)
 
     def _validate_multilinestring(self, value, top_level=True):
         if not isinstance(value, (list, tuple)):
@@ -596,7 +600,7 @@ class GeoJsonBaseField(BaseField):
         try:
             value[0][0][0]
         except (TypeError, IndexError):
-            return "Invalid MultiLineString must contain at least one valid linestring"
+            return 'Invalid MultiLineString must contain at least one valid linestring'
 
         errors = []
         for linestring in value:
@@ -606,9 +610,9 @@ class GeoJsonBaseField(BaseField):
 
         if errors:
             if top_level:
-                return "Invalid MultiLineString:\n%s" % ", ".join(errors)
+                return 'Invalid MultiLineString:\n%s' % ', '.join(errors)
             else:
-                return "%s" % ", ".join(errors)
+                return '%s' % ', '.join(errors)
 
     def _validate_multipolygon(self, value):
         if not isinstance(value, (list, tuple)):
@@ -618,7 +622,7 @@ class GeoJsonBaseField(BaseField):
         try:
             value[0][0][0][0]
         except (TypeError, IndexError):
-            return "Invalid MultiPolygon must contain at least one valid Polygon"
+            return 'Invalid MultiPolygon must contain at least one valid Polygon'
 
         errors = []
         for polygon in value:
@@ -627,9 +631,9 @@ class GeoJsonBaseField(BaseField):
                 errors.append(error)
 
         if errors:
-            return "Invalid MultiPolygon:\n%s" % ", ".join(errors)
+            return 'Invalid MultiPolygon:\n%s' % ', '.join(errors)
 
     def to_mongo(self, value):
         if isinstance(value, dict):
             return value
-        return SON([("type", self._type), ("coordinates", value)])
+        return SON([('type', self._type), ('coordinates', value)])

mongoengine/base/metaclasses.py

@@ -1,10 +1,11 @@
 import warnings
 
-from mongoengine.base.common import ALLOW_INHERITANCE, _document_registry
+import six
+
+from mongoengine.base.common import _document_registry
 from mongoengine.base.fields import BaseField, ComplexBaseField, ObjectIdField
 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,
                                   QuerySetManager)
@@ -45,7 +46,8 @@ class DocumentMetaclass(type):
             attrs['_meta'] = meta
             attrs['_meta']['abstract'] = False  # 789: EmbeddedDocument shouldn't inherit abstract
 
-        if attrs['_meta'].get('allow_inheritance', ALLOW_INHERITANCE):
+        # If allow_inheritance is True, add a "_cls" string field to the attrs
+        if attrs['_meta'].get('allow_inheritance'):
             StringField = _import_class('StringField')
             attrs['_cls'] = StringField()
 
@@ -87,16 +89,17 @@ class DocumentMetaclass(type):
         # 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 " %
+            msg = ('Multiple db_fields defined for: %s ' %
-                   ", ".join(duplicate_db_fields))
+                   ', '.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))
+        attrs['_db_field_map'] = {k: getattr(v, 'db_field', k)
-                                       for k, v in doc_fields.iteritems()])
+                                  for k, v in doc_fields.items()}
-        attrs['_reverse_db_field_map'] = dict(
+        attrs['_reverse_db_field_map'] = {
-            (v, k) for k, v in attrs['_db_field_map'].iteritems())
+            v: k for k, v in attrs['_db_field_map'].items()
+        }
 
         attrs['_fields_ordered'] = tuple(i[1] for i in sorted(
                                          (v.creation_counter, v.name)
@@ -116,10 +119,8 @@ class DocumentMetaclass(type):
             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 = base._meta.get('allow_inheritance')
-                                                   ALLOW_INHERITANCE)
+                if not allow_inheritance and not base._meta.get('abstract'):
-                if (allow_inheritance is not True and
-                        not base._meta.get('abstract')):
                     raise ValueError('Document %s may not be subclassed' %
                                      base.__name__)
 
@@ -161,7 +162,7 @@ class DocumentMetaclass(type):
         # 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:
+        if six.PY3:
             for val in new_class.__dict__.values():
                 if isinstance(val, classmethod):
                     f = val.__get__(new_class)
@@ -179,11 +180,11 @@ class DocumentMetaclass(type):
             if isinstance(f, CachedReferenceField):
 
                 if issubclass(new_class, EmbeddedDocument):
-                    raise InvalidDocumentError(
+                    raise InvalidDocumentError('CachedReferenceFields is not '
-                        "CachedReferenceFields is not allowed in EmbeddedDocuments")
+                                               'allowed in EmbeddedDocuments')
                 if not f.document_type:
                     raise InvalidDocumentError(
-                        "Document is not available to sync")
+                        'Document is not available to sync')
 
                 if f.auto_sync:
                     f.start_listener()
@@ -195,8 +196,8 @@ class DocumentMetaclass(type):
                                       'reverse_delete_rule',
                                       DO_NOTHING)
                 if isinstance(f, DictField) and delete_rule != DO_NOTHING:
-                    msg = ("Reverse delete rules are not supported "
+                    msg = ('Reverse delete rules are not supported '
-                           "for %s (field: %s)" %
+                           'for %s (field: %s)' %
                            (field.__class__.__name__, field.name))
                     raise InvalidDocumentError(msg)
 
@@ -204,16 +205,16 @@ class DocumentMetaclass(type):
 
             if delete_rule != DO_NOTHING:
                 if issubclass(new_class, EmbeddedDocument):
-                    msg = ("Reverse delete rules are not supported for "
+                    msg = ('Reverse delete rules are not supported for '
-                           "EmbeddedDocuments (field: %s)" % field.name)
+                           '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 "
+                msg = ('%s is a document method and not a valid '
-                       "field name" % field.name)
+                       'field name' % field.name)
                 raise InvalidDocumentError(msg)
 
         return new_class
@@ -271,6 +272,11 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
                 'index_drop_dups': False,
                 'index_opts': None,
                 'delete_rules': None,
+
+                # allow_inheritance can be True, False, and None. True means
+                # "allow inheritance", False means "don't allow inheritance",
+                # None means "do whatever your parent does, or don't allow
+                # inheritance if you're a top-level class".
                 'allow_inheritance': None,
             }
             attrs['_is_base_cls'] = True
@@ -303,7 +309,7 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
         # 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
+            msg = 'Trying to set a collection on a subclass (%s)' % name
             warnings.warn(msg, SyntaxWarning)
             del attrs['_meta']['collection']
 
@@ -311,7 +317,7 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
         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"
+                msg = 'Abstract document cannot have non-abstract base'
                 raise ValueError(msg)
             return super_new(cls, name, bases, attrs)
 
@@ -334,12 +340,16 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
 
         meta.merge(attrs.get('_meta', {}))  # Top level meta
 
-        # Only simple classes (direct subclasses of Document)
+        # Only simple classes (i.e. direct subclasses of Document) may set
-        # may set allow_inheritance to False
+        # allow_inheritance to False. If the base Document allows inheritance,
+        # none of its subclasses can override 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
+        if (
-                not meta['abstract']):
+            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')
 

mongoengine/common.py

@@ -34,7 +34,10 @@ def _import_class(cls_name):
     queryset_classes = ('OperationError',)
     deref_classes = ('DeReference',)
 
-    if cls_name in doc_classes:
+    if cls_name == 'BaseDocument':
+        from mongoengine.base import document as module
+        import_classes = ['BaseDocument']
+    elif cls_name in doc_classes:
         from mongoengine import document as module
         import_classes = doc_classes
     elif cls_name in field_classes:

mongoengine/connection.py

@@ -1,7 +1,9 @@
 from pymongo import MongoClient, ReadPreference, uri_parser
-from mongoengine.python_support import (IS_PYMONGO_3, str_types)
+import six
 
-__all__ = ['ConnectionError', 'connect', 'register_connection',
+from mongoengine.python_support import IS_PYMONGO_3
+
+__all__ = ['MongoEngineConnectionError', 'connect', 'register_connection',
            'DEFAULT_CONNECTION_NAME']
 
 
@@ -14,7 +16,10 @@ else:
     READ_PREFERENCE = False
 
 
-class ConnectionError(Exception):
+class MongoEngineConnectionError(Exception):
+    """Error raised when the database connection can't be established or
+    when a connection with a requested alias can't be retrieved.
+    """
     pass
 
 
@@ -25,7 +30,8 @@ _dbs = {}
 
 def register_connection(alias, name=None, host=None, port=None,
                         read_preference=READ_PREFERENCE,
-                        username=None, password=None, authentication_source=None,
+                        username=None, password=None,
+                        authentication_source=None,
                         authentication_mechanism=None,
                         **kwargs):
     """Add a connection.
@@ -45,12 +51,12 @@ def register_connection(alias, name=None, host=None, port=None,
         MONGODB-CR (MongoDB Challenge Response protocol) for older servers.
     :param is_mock: explicitly use mongomock for this connection
         (can also be done by using `mongomock://` as db host prefix)
-    :param kwargs: allow ad-hoc parameters to be passed into the pymongo driver
+    :param kwargs: ad-hoc parameters to be passed into the pymongo driver,
+        for example maxpoolsize, tz_aware, etc. See the documentation
+        for pymongo's `MongoClient` for a full list.
 
     .. versionchanged:: 0.10.6 - added mongomock support
     """
-    global _connection_settings
-
     conn_settings = {
         'name': name or 'test',
         'host': host or 'localhost',
@@ -62,31 +68,37 @@ def register_connection(alias, name=None, host=None, port=None,
         'authentication_mechanism': authentication_mechanism
     }
 
-    # Handle uri style connections
     conn_host = conn_settings['host']
-    # host can be a list or a string, so if string, force to a list
+
-    if isinstance(conn_host, str_types):
+    # Host can be a list or a string, so if string, force to a list.
+    if isinstance(conn_host, six.string_types):
         conn_host = [conn_host]
 
     resolved_hosts = []
     for entity in conn_host:
-        # Handle uri style connections
+
+        # Handle Mongomock
         if entity.startswith('mongomock://'):
             conn_settings['is_mock'] = True
             # `mongomock://` is not a valid url prefix and must be replaced by `mongodb://`
             resolved_hosts.append(entity.replace('mongomock://', 'mongodb://', 1))
+
+        # Handle URI style connections, only updating connection params which
+        # were explicitly specified in the URI.
         elif '://' in entity:
             uri_dict = uri_parser.parse_uri(entity)
             resolved_hosts.append(entity)
-            conn_settings.update({
+
-                'name': uri_dict.get('database') or name,
+            if uri_dict.get('database'):
-                'username': uri_dict.get('username'),
+                conn_settings['name'] = uri_dict.get('database')
-                'password': uri_dict.get('password'),
+
-                'read_preference': read_preference,
+            for param in ('read_preference', 'username', 'password'):
-            })
+                if uri_dict.get(param):
+                    conn_settings[param] = uri_dict[param]
+
             uri_options = uri_dict['options']
             if 'replicaset' in uri_options:
-                conn_settings['replicaSet'] = True
+                conn_settings['replicaSet'] = uri_options['replicaset']
             if 'authsource' in uri_options:
                 conn_settings['authentication_source'] = uri_options['authsource']
             if 'authmechanism' in uri_options:
@@ -104,9 +116,7 @@ def register_connection(alias, name=None, host=None, port=None,
 
 
 def disconnect(alias=DEFAULT_CONNECTION_NAME):
-    global _connections
+    """Close the connection with a given alias."""
-    global _dbs
-
     if alias in _connections:
         get_connection(alias=alias).close()
         del _connections[alias]
@@ -115,71 +125,99 @@ def disconnect(alias=DEFAULT_CONNECTION_NAME):
 
 
 def get_connection(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
-    global _connections
+    """Return a connection with a given alias."""
+
     # Connect to the database if not already connected
     if reconnect:
         disconnect(alias)
 
-    if alias not in _connections:
+    # If the requested alias already exists in the _connections list, return
-        if alias not in _connection_settings:
+    # it immediately.
-            msg = 'Connection with alias "%s" has not been defined' % alias
+    if alias in _connections:
-            if alias == DEFAULT_CONNECTION_NAME:
+        return _connections[alias]
-                msg = 'You have not defined a default connection'
-            raise ConnectionError(msg)
-        conn_settings = _connection_settings[alias].copy()
 
-        conn_settings.pop('name', None)
+    # Validate that the requested alias exists in the _connection_settings.
-        conn_settings.pop('username', None)
+    # Raise MongoEngineConnectionError if it doesn't.
-        conn_settings.pop('password', None)
+    if alias not in _connection_settings:
-        conn_settings.pop('authentication_source', None)
+        if alias == DEFAULT_CONNECTION_NAME:
-        conn_settings.pop('authentication_mechanism', None)
+            msg = 'You have not defined a default connection'
-
-        is_mock = conn_settings.pop('is_mock', None)
-        if is_mock:
-            # Use MongoClient from mongomock
-            try:
-                import mongomock
-            except ImportError:
-                raise RuntimeError('You need mongomock installed '
-                                   'to mock MongoEngine.')
-            connection_class = mongomock.MongoClient
         else:
-            # Use MongoClient from pymongo
+            msg = 'Connection with alias "%s" has not been defined' % alias
-            connection_class = MongoClient
+        raise MongoEngineConnectionError(msg)
+
+    def _clean_settings(settings_dict):
+        irrelevant_fields = set([
+            'name', 'username', 'password', 'authentication_source',
+            'authentication_mechanism'
+        ])
+        return {
+            k: v for k, v in settings_dict.items()
+            if k not in irrelevant_fields
+        }
+
+    # Retrieve a copy of the connection settings associated with the requested
+    # alias and remove the database name and authentication info (we don't
+    # care about them at this point).
+    conn_settings = _clean_settings(_connection_settings[alias].copy())
+
+    # Determine if we should use PyMongo's or mongomock's MongoClient.
+    is_mock = conn_settings.pop('is_mock', False)
+    if is_mock:
+        try:
+            import mongomock
+        except ImportError:
+            raise RuntimeError('You need mongomock installed to mock '
+                               'MongoEngine.')
+        connection_class = mongomock.MongoClient
+    else:
+        connection_class = MongoClient
+
+        # For replica set connections with PyMongo 2.x, use
+        # MongoReplicaSetClient.
+        # TODO remove this once we stop supporting PyMongo 2.x.
+        if 'replicaSet' in conn_settings and not IS_PYMONGO_3:
+            connection_class = MongoReplicaSetClient
+            conn_settings['hosts_or_uri'] = conn_settings.pop('host', None)
+
+            # hosts_or_uri has to be a string, so if 'host' was provided
+            # as a list, join its parts and separate them by ','
+            if isinstance(conn_settings['hosts_or_uri'], list):
+                conn_settings['hosts_or_uri'] = ','.join(
+                    conn_settings['hosts_or_uri'])
 
-        if 'replicaSet' in conn_settings:
             # 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)
-            if not IS_PYMONGO_3:
-                connection_class = MongoReplicaSetClient
-                conn_settings['hosts_or_uri'] = conn_settings.pop('host', None)
 
+    # Iterate over all of the connection settings and if a connection with
+    # the same parameters is already established, use it instead of creating
+    # a new one.
+    existing_connection = None
+    connection_settings_iterator = (
+        (db_alias, settings.copy())
+        for db_alias, settings in _connection_settings.items()
+    )
+    for db_alias, connection_settings in connection_settings_iterator:
+        connection_settings = _clean_settings(connection_settings)
+        if conn_settings == connection_settings and _connections.get(db_alias):
+            existing_connection = _connections[db_alias]
+            break
+
+    # If an existing connection was found, assign it to the new alias
+    if existing_connection:
+        _connections[alias] = existing_connection
+    else:
+        # Otherwise, create the new connection for this alias. Raise
+        # MongoEngineConnectionError if it can't be established.
         try:
-            connection = None
+            _connections[alias] = connection_class(**conn_settings)
-            # check for shared connections
+        except Exception as e:
-            connection_settings_iterator = (
+            raise MongoEngineConnectionError(
-                (db_alias, settings.copy()) for db_alias, settings in _connection_settings.iteritems())
+                'Cannot connect to database %s :\n%s' % (alias, e))
-            for db_alias, connection_settings in connection_settings_iterator:
-                connection_settings.pop('name', None)
-                connection_settings.pop('username', None)
-                connection_settings.pop('password', None)
-                connection_settings.pop('authentication_source', None)
-                connection_settings.pop('authentication_mechanism', None)
-                if conn_settings == connection_settings and _connections.get(db_alias, None):
-                    connection = _connections[db_alias]
-                    break
 
-            _connections[alias] = connection if connection else 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)
 
@@ -205,12 +243,14 @@ def connect(db=None, alias=DEFAULT_CONNECTION_NAME, **kwargs):
     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
+    Multiple databases are supported by using aliases. Provide a separate
     `alias` to connect to a different instance of :program:`mongod`.
 
+    See the docstring for `register_connection` for more details about all
+    supported kwargs.
+
     .. versionchanged:: 0.6 - added multiple database support.
     """
-    global _connections
     if alias not in _connections:
         register_connection(alias, db, **kwargs)
 

mongoengine/context_managers.py

@@ -2,12 +2,12 @@ from mongoengine.common import _import_class
 from mongoengine.connection import DEFAULT_CONNECTION_NAME, get_db
 
 
-__all__ = ("switch_db", "switch_collection", "no_dereference",
+__all__ = ('switch_db', 'switch_collection', 'no_dereference',
-           "no_sub_classes", "query_counter")
+           'no_sub_classes', 'query_counter')
 
 
 class switch_db(object):
-    """ switch_db alias context manager.
+    """switch_db alias context manager.
 
     Example ::
 
@@ -18,15 +18,14 @@ class switch_db(object):
         class Group(Document):
             name = StringField()
 
-        Group(name="test").save()  # Saves in the default db
+        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
+            Group(name='hello testdb!').save()  # Saves in testdb-1
-
     """
 
     def __init__(self, cls, db_alias):
-        """ Construct the switch_db context manager
+        """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
@@ -34,37 +33,36 @@ class switch_db(object):
         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)
+        self.ori_db_alias = cls._meta.get('db_alias', DEFAULT_CONNECTION_NAME)
 
     def __enter__(self):
-        """ change the db_alias and clear the cached collection """
+        """Change the db_alias and clear the cached collection."""
-        self.cls._meta["db_alias"] = self.db_alias
+        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 """
+        """Reset the db_alias and collection."""
-        self.cls._meta["db_alias"] = self.ori_db_alias
+        self.cls._meta['db_alias'] = self.ori_db_alias
         self.cls._collection = self.collection
 
 
 class switch_collection(object):
-    """ switch_collection alias context manager.
+    """switch_collection alias context manager.
 
     Example ::
 
         class Group(Document):
             name = StringField()
 
-        Group(name="test").save()  # Saves in the default db
+        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
+            Group(name='hello testdb!').save()  # Saves in group1 collection
-
     """
 
     def __init__(self, cls, collection_name):
-        """ Construct the switch_collection context manager
+        """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
@@ -75,7 +73,7 @@ class switch_collection(object):
         self.collection_name = collection_name
 
     def __enter__(self):
-        """ change the _get_collection_name and clear the cached collection """
+        """Change the _get_collection_name and clear the cached collection."""
 
         @classmethod
         def _get_collection_name(cls):
@@ -86,24 +84,23 @@ class switch_collection(object):
         return self.cls
 
     def __exit__(self, t, value, traceback):
-        """ Reset the collection """
+        """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.
+    """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.
+        """Construct the no_dereference context manager.
 
         :param cls: the class to turn dereferencing off on
         """
@@ -119,103 +116,102 @@ class no_dereference(object):
                                                ComplexBaseField))]
 
     def __enter__(self):
-        """ change the objects default and _auto_dereference values"""
+        """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"""
+        """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.
+    """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.
+        """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"""
+        """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"""
+        """Reset the default and _auto_dereference values."""
         self.cls._subclasses = self.cls._all_subclasses
         delattr(self.cls, '_all_subclasses')
         return self.cls
 
 
 class query_counter(object):
-    """ Query_counter context manager to get the number of queries. """
+    """Query_counter context manager to get the number of queries."""
 
     def __init__(self):
-        """ Construct the query_counter. """
+        """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. """
+        """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. """
+        """Reset the profiling level."""
         self.db.set_profiling_level(0)
 
     def __eq__(self, value):
-        """ == Compare querycounter. """
+        """== Compare querycounter."""
         counter = self._get_count()
         return value == counter
 
     def __ne__(self, value):
-        """ != Compare querycounter. """
+        """!= Compare querycounter."""
         return not self.__eq__(value)
 
     def __lt__(self, value):
-        """ < Compare querycounter. """
+        """< Compare querycounter."""
         return self._get_count() < value
 
     def __le__(self, value):
-        """ <= Compare querycounter. """
+        """<= Compare querycounter."""
         return self._get_count() <= value
 
     def __gt__(self, value):
-        """ > Compare querycounter. """
+        """> Compare querycounter."""
         return self._get_count() > value
 
     def __ge__(self, value):
-        """ >= Compare querycounter. """
+        """>= Compare querycounter."""
         return self._get_count() >= value
 
     def __int__(self):
-        """ int representation. """
+        """int representation."""
         return self._get_count()
 
     def __repr__(self):
-        """ repr query_counter as the number of queries. """
+        """repr query_counter as the number of queries."""
         return u"%s" % self._get_count()
 
     def _get_count(self):
-        """ Get the number of queries. """
+        """Get the number of queries."""
-        ignore_query = {"ns": {"$ne": "%s.system.indexes" % self.db.name}}
+        ignore_query = {'ns': {'$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

@@ -1,14 +1,12 @@
 from bson import DBRef, SON
+import six
 
-from .base import (
+from mongoengine.base import (BaseDict, BaseList, EmbeddedDocumentList,
-    BaseDict, BaseList, EmbeddedDocumentList,
+                              TopLevelDocumentMetaclass, get_document)
-    TopLevelDocumentMetaclass, get_document
+from mongoengine.connection import get_db
-)
+from mongoengine.document import Document, EmbeddedDocument
-from .connection import get_db
+from mongoengine.fields import DictField, ListField, MapField, ReferenceField
-from .document import Document, EmbeddedDocument
+from mongoengine.queryset import QuerySet
-from .fields import DictField, ListField, MapField, ReferenceField
-from .python_support import txt_type
-from .queryset import QuerySet
 
 
 class DeReference(object):
@@ -25,7 +23,7 @@ class DeReference(object):
             :class:`~mongoengine.base.ComplexBaseField`
         :param get: A boolean determining if being called by __get__
         """
-        if items is None or isinstance(items, basestring):
+        if items is None or isinstance(items, six.string_types):
             return items
 
         # cheapest way to convert a queryset to a list
@@ -68,11 +66,11 @@ class DeReference(object):
 
                         items = _get_items(items)
                     else:
-                        items = dict([
+                        items = {
-                            (k, field.to_python(v))
+                            k: (v if isinstance(v, (DBRef, Document))
-                            if not isinstance(v, (DBRef, Document)) else (k, v)
+                                else field.to_python(v))
-                            for k, v in items.iteritems()]
+                            for k, v in items.iteritems()
-                        )
+                        }
 
         self.reference_map = self._find_references(items)
         self.object_map = self._fetch_objects(doc_type=doc_type)
@@ -90,14 +88,14 @@ class DeReference(object):
             return reference_map
 
         # Determine the iterator to use
-        if not hasattr(items, 'items'):
+        if isinstance(items, dict):
-            iterator = enumerate(items)
+            iterator = items.values()
         else:
-            iterator = items.iteritems()
+            iterator = items
 
         # Recursively find dbreferences
         depth += 1
-        for k, item in iterator:
+        for item in iterator:
             if isinstance(item, (Document, EmbeddedDocument)):
                 for field_name, field in item._fields.iteritems():
                     v = item._data.get(field_name, None)
@@ -151,7 +149,7 @@ class DeReference(object):
                     references = get_db()[collection].find({'_id': {'$in': refs}})
                     for ref in references:
                         if '_cls' in ref:
-                            doc = get_document(ref["_cls"])._from_son(ref)
+                            doc = get_document(ref['_cls'])._from_son(ref)
                         elif doc_type is None:
                             doc = get_document(
                                 ''.join(x.capitalize()
@@ -218,7 +216,7 @@ class DeReference(object):
             if k in self.object_map and not is_list:
                 data[k] = self.object_map[k]
             elif isinstance(v, (Document, EmbeddedDocument)):
-                for field_name, field in v._fields.iteritems():
+                for field_name in v._fields:
                     v = data[k]._data.get(field_name, None)
                     if isinstance(v, DBRef):
                         data[k]._data[field_name] = self.object_map.get(
@@ -227,7 +225,7 @@ class DeReference(object):
                         data[k]._data[field_name] = self.object_map.get(
                             (v['_ref'].collection, v['_ref'].id), v)
                     elif isinstance(v, (dict, list, tuple)) and depth <= self.max_depth:
-                        item_name = txt_type("{0}.{1}.{2}").format(name, k, field_name)
+                        item_name = six.text_type('{0}.{1}.{2}').format(name, k, field_name)
                         data[k]._data[field_name] = self._attach_objects(v, depth, instance=instance, name=item_name)
             elif isinstance(v, (dict, list, tuple)) and depth <= self.max_depth:
                 item_name = '%s.%s' % (name, k) if name else name

mongoengine/document.py

@@ -4,18 +4,12 @@ import warnings
 from bson.dbref import DBRef
 import pymongo
 from pymongo.read_preferences import ReadPreference
+import six
 
 from mongoengine import signals
-from mongoengine.base import (
+from mongoengine.base import (BaseDict, BaseDocument, BaseList,
-    ALLOW_INHERITANCE,
+                              DocumentMetaclass, EmbeddedDocumentList,
-    BaseDict,
+                              TopLevelDocumentMetaclass, get_document)
-    BaseDocument,
-    BaseList,
-    DocumentMetaclass,
-    EmbeddedDocumentList,
-    TopLevelDocumentMetaclass,
-    get_document
-)
 from mongoengine.common import _import_class
 from mongoengine.connection import DEFAULT_CONNECTION_NAME, get_db
 from mongoengine.context_managers import switch_collection, switch_db
@@ -31,12 +25,10 @@ __all__ = ('Document', 'EmbeddedDocument', 'DynamicDocument',
 
 
 def includes_cls(fields):
-    """ Helper function used for ensuring and comparing indexes
+    """Helper function used for ensuring and comparing indexes."""
-    """
-
     first_field = None
     if len(fields):
-        if isinstance(fields[0], basestring):
+        if isinstance(fields[0], six.string_types):
             first_field = fields[0]
         elif isinstance(fields[0], (list, tuple)) and len(fields[0]):
             first_field = fields[0][0]
@@ -57,9 +49,8 @@ class EmbeddedDocument(BaseDocument):
     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
+    To enable this behaviour set :attr:`allow_inheritance` to ``True`` in the
-    `_cls` set :attr:`allow_inheritance` to ``False`` in the :attr:`meta`
+    :attr:`meta` dictionary.
-    dictionary.
     """
 
     __slots__ = ('_instance', )
@@ -69,6 +60,12 @@ class EmbeddedDocument(BaseDocument):
     my_metaclass = DocumentMetaclass
     __metaclass__ = DocumentMetaclass
 
+    # A generic embedded document doesn't have any immutable properties
+    # that describe it uniquely, hence it shouldn't be hashable. You can
+    # define your own __hash__ method on a subclass if you need your
+    # embedded documents to be hashable.
+    __hash__ = None
+
     def __init__(self, *args, **kwargs):
         super(EmbeddedDocument, self).__init__(*args, **kwargs)
         self._instance = None
@@ -82,6 +79,15 @@ class EmbeddedDocument(BaseDocument):
     def __ne__(self, other):
         return not self.__eq__(other)
 
+    def to_mongo(self, *args, **kwargs):
+        data = super(EmbeddedDocument, self).to_mongo(*args, **kwargs)
+
+        # remove _id from the SON if it's in it and it's None
+        if '_id' in data and data['_id'] is None:
+            del data['_id']
+
+        return data
+
     def save(self, *args, **kwargs):
         self._instance.save(*args, **kwargs)
 
@@ -106,9 +112,8 @@ class Document(BaseDocument):
     create a specialised version of the 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
+    To enable this behaviourset :attr:`allow_inheritance` to ``True`` in the
-    `_cls` set :attr:`allow_inheritance` to ``False`` in the :attr:`meta`
+    :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`
@@ -149,69 +154,105 @@ class Document(BaseDocument):
 
     __slots__ = ('__objects',)
 
-    def pk():
+    @property
-        """Primary key alias
+    def pk(self):
+        """Get the primary key."""
+        if 'id_field' not in self._meta:
+            return None
+        return getattr(self, self._meta['id_field'])
+
+    @pk.setter
+    def pk(self, value):
+        """Set the primary key."""
+        return setattr(self, self._meta['id_field'], value)
+
+    def __hash__(self):
+        """Return the hash based on the PK of this document. If it's new
+        and doesn't have a PK yet, return the default object hash instead.
         """
-
+        if self.pk is None:
-        def fget(self):
+            return super(BaseDocument, self).__hash__()
-            if 'id_field' not in self._meta:
+        else:
-                return None
+            return hash(self.pk)
-            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))
+        return get_db(cls._meta.get('db_alias', DEFAULT_CONNECTION_NAME))
 
     @classmethod
     def _get_collection(cls):
-        """Returns the collection for the document."""
+        """Return a PyMongo collection for the document."""
-        # TODO: use new get_collection() with PyMongo3 ?
         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.get('max_size') or cls._meta.get('max_documents'):
-                # Get max document limit and max byte size from meta
-                max_size = cls._meta.get('max_size') or 10 * 2 ** 20  # 10MB default
-                max_documents = cls._meta.get('max_documents')
-                # Round up to next 256 bytes as MongoDB would do it to avoid exception
-                if max_size % 256:
-                    max_size = (max_size // 256 + 1) * 256
 
-                if collection_name in db.collection_names():
+            # Get the collection, either capped or regular.
-                    cls._collection = db[collection_name]
+            if cls._meta.get('max_size') or cls._meta.get('max_documents'):
-                    # The collection already exists, check if its capped
+                cls._collection = cls._get_capped_collection()
-                    # 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:
+                db = cls._get_db()
+                collection_name = cls._get_collection_name()
                 cls._collection = db[collection_name]
+
+            # Ensure indexes on the collection unless auto_create_index was
+            # set to False.
             if cls._meta.get('auto_create_index', True):
                 cls.ensure_indexes()
+
         return cls._collection
 
-    def modify(self, query={}, **update):
+    @classmethod
+    def _get_capped_collection(cls):
+        """Create a new or get an existing capped PyMongo collection."""
+        db = cls._get_db()
+        collection_name = cls._get_collection_name()
+
+        # Get max document limit and max byte size from meta.
+        max_size = cls._meta.get('max_size') or 10 * 2 ** 20  # 10MB default
+        max_documents = cls._meta.get('max_documents')
+
+        # MongoDB will automatically raise the size to make it a multiple of
+        # 256 bytes. We raise it here ourselves to be able to reliably compare
+        # the options below.
+        if max_size % 256:
+            max_size = (max_size // 256 + 1) * 256
+
+        # If the collection already exists and has different options
+        # (i.e. isn't capped or has different max/size), raise an error.
+        if collection_name in db.collection_names():
+            collection = db[collection_name]
+            options = collection.options()
+            if (
+                options.get('max') != max_documents or
+                options.get('size') != max_size
+            ):
+                raise InvalidCollectionError(
+                    'Cannot create collection "{}" as a capped '
+                    'collection as it already exists'.format(cls._collection)
+                )
+
+            return collection
+
+        # Create a new capped collection.
+        opts = {'capped': True, 'size': max_size}
+        if max_documents:
+            opts['max'] = max_documents
+
+        return db.create_collection(collection_name, **opts)
+
+    def to_mongo(self, *args, **kwargs):
+        data = super(Document, self).to_mongo(*args, **kwargs)
+
+        # If '_id' is None, try and set it from self._data. If that
+        # doesn't exist either, remote '_id' from the SON completely.
+        if data['_id'] is None:
+            if self._data.get('id') is None:
+                del data['_id']
+            else:
+                data['_id'] = self._data['id']
+
+        return data
+
+    def modify(self, query=None, **update):
         """Perform an atomic update of the document in the database and reload
         the document object using updated version.
 
@@ -225,17 +266,19 @@ class Document(BaseDocument):
             database matches the query
         :param update: Django-style update keyword arguments
         """
+        if query is None:
+            query = {}
 
         if self.pk is None:
-            raise InvalidDocumentError("The document does not have a primary key.")
+            raise InvalidDocumentError('The document does not have a primary key.')
 
-        id_field = self._meta["id_field"]
+        id_field = self._meta['id_field']
         query = query.copy() if isinstance(query, dict) else query.to_query(self)
 
         if id_field not in query:
             query[id_field] = self.pk
         elif query[id_field] != self.pk:
-            raise InvalidQueryError("Invalid document modify query: it must modify only this document.")
+            raise InvalidQueryError('Invalid document modify query: it must modify only this document.')
 
         updated = self._qs(**query).modify(new=True, **update)
         if updated is None:
@@ -257,7 +300,7 @@ class Document(BaseDocument):
         created.
 
         :param force_insert: only try to create a new document, don't allow
-            updates of existing documents
+            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.
@@ -303,6 +346,9 @@ class Document(BaseDocument):
         .. versionchanged:: 0.10.7
             Add signal_kwargs argument
         """
+        if self._meta.get('abstract'):
+            raise InvalidDocumentError('Cannot save an abstract document.')
+
         signal_kwargs = signal_kwargs or {}
         signals.pre_save.send(self.__class__, document=self, **signal_kwargs)
 
@@ -310,7 +356,7 @@ class Document(BaseDocument):
             self.validate(clean=clean)
 
         if write_concern is None:
-            write_concern = {"w": 1}
+            write_concern = {'w': 1}
 
         doc = self.to_mongo()
 
@@ -319,105 +365,145 @@ class Document(BaseDocument):
         signals.pre_save_post_validation.send(self.__class__, document=self,
                                               created=created, **signal_kwargs)
 
+        if self._meta.get('auto_create_index', True):
+            self.ensure_indexes()
+
         try:
-            collection = self._get_collection()
+            # Save a new document or update an existing one
-            if self._meta.get('auto_create_index', True):
-                self.ensure_indexes()
             if created:
-                if force_insert:
+                object_id = self._save_create(doc, force_insert, write_concern)
-                    object_id = collection.insert(doc, **write_concern)
-                else:
-                    object_id = collection.save(doc, **write_concern)
-                    # In PyMongo 3.0, the save() call calls internally the _update() call
-                    # but they forget to return the _id value passed back, therefore getting it back here
-                    # Correct behaviour in 2.X and in 3.0.1+ versions
-                    if not object_id and pymongo.version_tuple == (3, 0):
-                        pk_as_mongo_obj = self._fields.get(self._meta['id_field']).to_mongo(self.pk)
-                        object_id = (
-                            self._qs.filter(pk=pk_as_mongo_obj).first() and
-                            self._qs.filter(pk=pk_as_mongo_obj).first().pk
-                        )  # TODO doesn't this make 2 queries?
             else:
-                object_id = doc['_id']
+                object_id, created = self._save_update(doc, save_condition,
-                updates, removals = self._delta()
+                                                       write_concern)
-                # Need to add shard key to query, or you get an error
-                if save_condition is not None:
-                    select_dict = transform.query(self.__class__,
-                                                  **save_condition)
-                else:
-                    select_dict = {}
-                select_dict['_id'] = object_id
-                shard_key = self.__class__._meta.get('shard_key', tuple())
-                for k in shard_key:
-                    path = self._lookup_field(k.split('.'))
-                    actual_key = [p.db_field for p in path]
-                    val = doc
-                    for ak in actual_key:
-                        val = val[ak]
-                    select_dict['.'.join(actual_key)] = val
-
-                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:
-                    upsert = save_condition is None
-                    last_error = collection.update(select_dict, update_query,
-                                                   upsert=upsert, **write_concern)
-                    if not upsert and last_error["n"] == 0:
-                        raise SaveConditionError('Race condition preventing'
-                                                 ' document update detected')
-                    created = is_new_object(last_error)
 
             if cascade is None:
-                cascade = self._meta.get(
+                cascade = (self._meta.get('cascade', False) or
-                    'cascade', False) or cascade_kwargs is not None
+                           cascade_kwargs is not None)
 
             if cascade:
                 kwargs = {
-                    "force_insert": force_insert,
+                    'force_insert': force_insert,
-                    "validate": validate,
+                    'validate': validate,
-                    "write_concern": write_concern,
+                    'write_concern': write_concern,
-                    "cascade": cascade
+                    'cascade': cascade
                 }
                 if cascade_kwargs:  # Allow granular control over cascades
                     kwargs.update(cascade_kwargs)
                 kwargs['_refs'] = _refs
                 self.cascade_save(**kwargs)
-        except pymongo.errors.DuplicateKeyError, err:
+
+        except pymongo.errors.DuplicateKeyError as err:
             message = u'Tried to save duplicate unique keys (%s)'
-            raise NotUniqueError(message % unicode(err))
+            raise NotUniqueError(message % six.text_type(err))
-        except pymongo.errors.OperationFailure, err:
+        except pymongo.errors.OperationFailure as err:
             message = 'Could not save document (%s)'
-            if re.match('^E1100[01] duplicate key', unicode(err)):
+            if re.match('^E1100[01] duplicate key', six.text_type(err)):
                 # E11000 - duplicate key error index
                 # E11001 - duplicate key on update
                 message = u'Tried to save duplicate unique keys (%s)'
-                raise NotUniqueError(message % unicode(err))
+                raise NotUniqueError(message % six.text_type(err))
-            raise OperationError(message % unicode(err))
+            raise OperationError(message % six.text_type(err))
+
+        # Make sure we store the PK on this document now that it's saved
         id_field = self._meta['id_field']
         if created or id_field not in self._meta.get('shard_key', []):
             self[id_field] = self._fields[id_field].to_python(object_id)
 
         signals.post_save.send(self.__class__, document=self,
                                created=created, **signal_kwargs)
+
         self._clear_changed_fields()
         self._created = False
+
         return self
 
-    def cascade_save(self, *args, **kwargs):
+    def _save_create(self, doc, force_insert, write_concern):
-        """Recursively saves any references /
+        """Save a new document.
-           generic references on the document"""
+
-        _refs = kwargs.get('_refs', []) or []
+        Helper method, should only be used inside save().
+        """
+        collection = self._get_collection()
+
+        if force_insert:
+            return collection.insert(doc, **write_concern)
+
+        object_id = collection.save(doc, **write_concern)
+
+        # In PyMongo 3.0, the save() call calls internally the _update() call
+        # but they forget to return the _id value passed back, therefore getting it back here
+        # Correct behaviour in 2.X and in 3.0.1+ versions
+        if not object_id and pymongo.version_tuple == (3, 0):
+            pk_as_mongo_obj = self._fields.get(self._meta['id_field']).to_mongo(self.pk)
+            object_id = (
+                self._qs.filter(pk=pk_as_mongo_obj).first() and
+                self._qs.filter(pk=pk_as_mongo_obj).first().pk
+            )  # TODO doesn't this make 2 queries?
+
+        return object_id
+
+    def _get_update_doc(self):
+        """Return a dict containing all the $set and $unset operations
+        that should be sent to MongoDB based on the changes made to this
+        Document.
+        """
+        updates, removals = self._delta()
+
+        update_doc = {}
+        if updates:
+            update_doc['$set'] = updates
+        if removals:
+            update_doc['$unset'] = removals
+
+        return update_doc
+
+    def _save_update(self, doc, save_condition, write_concern):
+        """Update an existing document.
+
+        Helper method, should only be used inside save().
+        """
+        collection = self._get_collection()
+        object_id = doc['_id']
+        created = False
+
+        select_dict = {}
+        if save_condition is not None:
+            select_dict = transform.query(self.__class__, **save_condition)
+
+        select_dict['_id'] = object_id
+
+        # Need to add shard key to query, or you get an error
+        shard_key = self._meta.get('shard_key', tuple())
+        for k in shard_key:
+            path = self._lookup_field(k.split('.'))
+            actual_key = [p.db_field for p in path]
+            val = doc
+            for ak in actual_key:
+                val = val[ak]
+            select_dict['.'.join(actual_key)] = val
+
+        update_doc = self._get_update_doc()
+        if update_doc:
+            upsert = save_condition is None
+            last_error = collection.update(select_dict, update_doc,
+                                           upsert=upsert, **write_concern)
+            if not upsert and last_error['n'] == 0:
+                raise SaveConditionError('Race condition preventing'
+                                         ' document update detected')
+            if last_error is not None:
+                updated_existing = last_error.get('updatedExisting')
+                if updated_existing is False:
+                    created = True
+                    # !!! This is bad, means we accidentally created a new,
+                    # potentially corrupted document. See
+                    # https://github.com/MongoEngine/mongoengine/issues/564
+
+        return object_id, created
+
+    def cascade_save(self, **kwargs):
+        """Recursively save any references and generic references on the
+        document.
+        """
+        _refs = kwargs.get('_refs') or []
 
         ReferenceField = _import_class('ReferenceField')
         GenericReferenceField = _import_class('GenericReferenceField')
@@ -443,16 +529,17 @@ class Document(BaseDocument):
 
     @property
     def _qs(self):
-        """
+        """Return the queryset to use for updating / reloading / deletions."""
-        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
+        """Get the query dict that can be used to fetch this object from
+        the database. Most of the time it's a simple PK lookup, but in
+        case of a sharded collection with a compound shard key, it can
+        contain a more complex query.
         """
         select_dict = {'pk': self.pk}
         shard_key = self.__class__._meta.get('shard_key', tuple())
@@ -475,8 +562,8 @@ class Document(BaseDocument):
         if self.pk is None:
             if kwargs.get('upsert', False):
                 query = self.to_mongo()
-                if "_cls" in query:
+                if '_cls' in query:
-                    del query["_cls"]
+                    del query['_cls']
                 return self._qs.filter(**query).update_one(**kwargs)
             else:
                 raise OperationError(
@@ -513,7 +600,7 @@ class Document(BaseDocument):
         try:
             self._qs.filter(
                 **self._object_key).delete(write_concern=write_concern, _from_doc_delete=True)
-        except pymongo.errors.OperationFailure, err:
+        except pymongo.errors.OperationFailure as err:
             message = u'Could not delete document (%s)' % err.message
             raise OperationError(message)
         signals.post_delete.send(self.__class__, document=self, **signal_kwargs)
@@ -601,11 +688,12 @@ class Document(BaseDocument):
         if fields and isinstance(fields[0], int):
             max_depth = fields[0]
             fields = fields[1:]
-        elif "max_depth" in kwargs:
+        elif 'max_depth' in kwargs:
-            max_depth = kwargs["max_depth"]
+            max_depth = kwargs['max_depth']
 
         if self.pk is None:
-            raise self.DoesNotExist("Document does not exist")
+            raise self.DoesNotExist('Document does not exist')
+
         obj = self._qs.read_preference(ReadPreference.PRIMARY).filter(
             **self._object_key).only(*fields).limit(
             1).select_related(max_depth=max_depth)
@@ -613,7 +701,7 @@ class Document(BaseDocument):
         if obj:
             obj = obj[0]
         else:
-            raise self.DoesNotExist("Document does not exist")
+            raise self.DoesNotExist('Document does not exist')
 
         for field in obj._data:
             if not fields or field in fields:
@@ -656,7 +744,7 @@ class Document(BaseDocument):
         """Returns an instance of :class:`~bson.dbref.DBRef` useful in
         `__raw__` queries."""
         if self.pk is None:
-            msg = "Only saved documents can have a valid dbref"
+            msg = 'Only saved documents can have a valid dbref'
             raise OperationError(msg)
         return DBRef(self.__class__._get_collection_name(), self.pk)
 
@@ -711,7 +799,7 @@ class Document(BaseDocument):
         fields = index_spec.pop('fields')
         drop_dups = kwargs.get('drop_dups', False)
         if IS_PYMONGO_3 and drop_dups:
-            msg = "drop_dups is deprecated and is removed when using PyMongo 3+."
+            msg = 'drop_dups is deprecated and is removed when using PyMongo 3+.'
             warnings.warn(msg, DeprecationWarning)
         elif not IS_PYMONGO_3:
             index_spec['drop_dups'] = drop_dups
@@ -737,7 +825,7 @@ class Document(BaseDocument):
             will be removed if PyMongo3+ is used
         """
         if IS_PYMONGO_3 and drop_dups:
-            msg = "drop_dups is deprecated and is removed when using PyMongo 3+."
+            msg = 'drop_dups is deprecated and is removed when using PyMongo 3+.'
             warnings.warn(msg, DeprecationWarning)
         elif not IS_PYMONGO_3:
             kwargs.update({'drop_dups': drop_dups})
@@ -757,7 +845,7 @@ class Document(BaseDocument):
         index_opts = cls._meta.get('index_opts') or {}
         index_cls = cls._meta.get('index_cls', True)
         if IS_PYMONGO_3 and drop_dups:
-            msg = "drop_dups is deprecated and is removed when using PyMongo 3+."
+            msg = 'drop_dups is deprecated and is removed when using PyMongo 3+.'
             warnings.warn(msg, DeprecationWarning)
 
         collection = cls._get_collection()
@@ -795,8 +883,7 @@ class Document(BaseDocument):
 
         # 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
+        if index_cls and not cls_indexed and cls._meta.get('allow_inheritance'):
-                cls._meta.get('allow_inheritance', ALLOW_INHERITANCE) is True):
 
             # we shouldn't pass 'cls' to the collection.ensureIndex options
             # because of https://jira.mongodb.org/browse/SERVER-769
@@ -815,7 +902,6 @@ class Document(BaseDocument):
         """ 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 []
 
@@ -866,16 +952,15 @@ class Document(BaseDocument):
         # 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
+        if cls._meta.get('index_cls', True) and cls._meta.get('allow_inheritance'):
-                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
+        """ Compares the indexes defined in MongoEngine with the ones
-        in the database. Returns any missing/extra indexes.
+        existing in the database. Returns any missing/extra indexes.
         """
 
         required = cls.list_indexes()
@@ -919,8 +1004,9 @@ class DynamicDocument(Document):
     _dynamic = True
 
     def __delattr__(self, *args, **kwargs):
-        """Deletes the attribute by setting to None and allowing _delta to unset
+        """Delete the attribute by setting to None and allowing _delta
-        it"""
+        to unset it.
+        """
         field_name = args[0]
         if field_name in self._dynamic_fields:
             setattr(self, field_name, None)
@@ -942,8 +1028,9 @@ class DynamicEmbeddedDocument(EmbeddedDocument):
     _dynamic = True
 
     def __delattr__(self, *args, **kwargs):
-        """Deletes the attribute by setting to None and allowing _delta to unset
+        """Delete the attribute by setting to None and allowing _delta
-        it"""
+        to unset it.
+        """
         field_name = args[0]
         if field_name in self._fields:
             default = self._fields[field_name].default
@@ -985,10 +1072,10 @@ class MapReduceDocument(object):
             try:
                 self.key = id_field_type(self.key)
             except Exception:
-                raise Exception("Could not cast key as %s" %
+                raise Exception('Could not cast key as %s' %
                                 id_field_type.__name__)
 
-        if not hasattr(self, "_key_object"):
+        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

@@ -1,7 +1,6 @@
 from collections import defaultdict
 
-from mongoengine.python_support import txt_type
+import six
-
 
 __all__ = ('NotRegistered', 'InvalidDocumentError', 'LookUpError',
            'DoesNotExist', 'MultipleObjectsReturned', 'InvalidQueryError',
@@ -51,8 +50,8 @@ class FieldDoesNotExist(Exception):
     or an :class:`~mongoengine.EmbeddedDocument`.
 
     To avoid this behavior on data loading,
-    you should the :attr:`strict` to ``False``
+    you should set the :attr:`strict` to ``False``
-    in the :attr:`meta` dictionnary.
+    in the :attr:`meta` dictionary.
     """
 
 
@@ -71,13 +70,13 @@ class ValidationError(AssertionError):
     field_name = None
     _message = None
 
-    def __init__(self, message="", **kwargs):
+    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)
+        return six.text_type(self.message)
 
     def __repr__(self):
         return '%s(%s,)' % (self.__class__.__name__, self.message)
@@ -111,17 +110,20 @@ class ValidationError(AssertionError):
             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 six.text_type(source)
+
             return errors_dict
 
         if not self.errors:
             return {}
+
         return build_dict(self.errors)
 
     def _format_errors(self):
@@ -134,10 +136,10 @@ class ValidationError(AssertionError):
                 value = ' '.join(
                     [generate_key(v, k) for k, v in value.iteritems()])
 
-            results = "%s.%s" % (prefix, value) if prefix else value
+            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()])
+        return ' '.join(['%s: %s' % (k, v) for k, v in error_dict.iteritems()])

mongoengine/fields.py

@@ -2,8 +2,8 @@ import datetime
 import decimal
 import itertools
 import re
+import socket
 import time
-import urllib2
 import uuid
 import warnings
 from operator import itemgetter
@@ -25,13 +25,13 @@ try:
 except ImportError:
     Int64 = long
 
-from .base import (BaseDocument, BaseField, ComplexBaseField, GeoJsonBaseField,
+from mongoengine.base import (BaseDocument, BaseField, ComplexBaseField,
-                   ObjectIdField, get_document)
+                              GeoJsonBaseField, ObjectIdField, get_document)
-from .connection import DEFAULT_CONNECTION_NAME, get_db
+from mongoengine.connection import DEFAULT_CONNECTION_NAME, get_db
-from .document import Document, EmbeddedDocument
+from mongoengine.document import Document, EmbeddedDocument
-from .errors import DoesNotExist, ValidationError
+from mongoengine.errors import DoesNotExist, InvalidQueryError, ValidationError
-from .python_support import PY3, StringIO, bin_type, str_types, txt_type
+from mongoengine.python_support import StringIO
-from .queryset import DO_NOTHING, QuerySet
+from mongoengine.queryset import DO_NOTHING, QuerySet
 
 try:
     from PIL import Image, ImageOps
@@ -39,7 +39,7 @@ except ImportError:
     Image = None
     ImageOps = None
 
-__all__ = [
+__all__ = (
     'StringField', 'URLField', 'EmailField', 'IntField', 'LongField',
     'FloatField', 'DecimalField', 'BooleanField', 'DateTimeField',
     'ComplexDateTimeField', 'EmbeddedDocumentField', 'ObjectIdField',
@@ -50,14 +50,14 @@ __all__ = [
     'FileField', 'ImageGridFsProxy', 'ImproperlyConfigured', 'ImageField',
     'GeoPointField', 'PointField', 'LineStringField', 'PolygonField',
     'SequenceField', 'UUIDField', 'MultiPointField', 'MultiLineStringField',
-    'MultiPolygonField', 'GeoJsonBaseField']
+    'MultiPolygonField', 'GeoJsonBaseField'
+)
 
 RECURSIVE_REFERENCE_CONSTANT = 'self'
 
 
 class StringField(BaseField):
-    """A unicode string field.
+    """A unicode string field."""
-    """
 
     def __init__(self, regex=None, max_length=None, min_length=None, **kwargs):
         self.regex = re.compile(regex) if regex else None
@@ -66,7 +66,7 @@ class StringField(BaseField):
         super(StringField, self).__init__(**kwargs)
 
     def to_python(self, value):
-        if isinstance(value, unicode):
+        if isinstance(value, six.text_type):
             return value
         try:
             value = value.decode('utf-8')
@@ -75,7 +75,7 @@ class StringField(BaseField):
         return value
 
     def validate(self, value):
-        if not isinstance(value, basestring):
+        if not isinstance(value, six.string_types):
             self.error('StringField only accepts string values')
 
         if self.max_length is not None and len(value) > self.max_length:
@@ -91,7 +91,7 @@ class StringField(BaseField):
         return None
 
     def prepare_query_value(self, op, value):
-        if not isinstance(op, basestring):
+        if not isinstance(op, six.string_types):
             return value
 
         if op.lstrip('i') in ('startswith', 'endswith', 'contains', 'exact'):
@@ -140,50 +140,122 @@ class URLField(StringField):
         # Check first if the scheme is valid
         scheme = value.split('://')[0].lower()
         if scheme not in self.schemes:
-            self.error('Invalid scheme {} in URL: {}'.format(scheme, value))
+            self.error(u'Invalid scheme {} in URL: {}'.format(scheme, value))
             return
 
         # Then check full URL
         if not self.url_regex.match(value):
-            self.error('Invalid URL: {}'.format(value))
+            self.error(u'Invalid URL: {}'.format(value))
             return
 
-        if self.verify_exists:
-            warnings.warn(
-                "The URLField verify_exists argument has intractable security "
-                "and performance issues. Accordingly, it has been deprecated.",
-                DeprecationWarning)
-            try:
-                request = urllib2.Request(value)
-                urllib2.urlopen(request)
-            except Exception, e:
-                self.error('This URL appears to be a broken link: %s' % e)
-
 
 class EmailField(StringField):
     """A field that validates input as an email address.
 
     .. versionadded:: 0.4
     """
-
+    USER_REGEX = re.compile(
-    EMAIL_REGEX = re.compile(
+        # `dot-atom` defined in RFC 5322 Section 3.2.3.
-        # dot-atom
+        r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*\Z"
-        r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*"
+        # `quoted-string` defined in RFC 5322 Section 3.2.4.
-        # quoted-string
+        r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-\011\013\014\016-\177])*"\Z)',
-        r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-011\013\014\016-\177])*"'
+        re.IGNORECASE
-        # domain (max length of an ICAAN TLD is 22 characters)
-        r')@(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}|[A-Z0-9-]{2,}(?<!-))$', re.IGNORECASE
     )
 
+    UTF8_USER_REGEX = re.compile(
+        six.u(
+            # RFC 6531 Section 3.3 extends `atext` (used by dot-atom) to
+            # include `UTF8-non-ascii`.
+            r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z\u0080-\U0010FFFF]+(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z\u0080-\U0010FFFF]+)*\Z"
+            # `quoted-string`
+            r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|\\[\001-\011\013\014\016-\177])*"\Z)'
+        ), re.IGNORECASE | re.UNICODE
+    )
+
+    DOMAIN_REGEX = re.compile(
+        r'((?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+)(?:[A-Z0-9-]{2,63}(?<!-))\Z',
+        re.IGNORECASE
+    )
+
+    error_msg = u'Invalid email address: %s'
+
+    def __init__(self, domain_whitelist=None, allow_utf8_user=False,
+                 allow_ip_domain=False, *args, **kwargs):
+        """Initialize the EmailField.
+
+        Args:
+            domain_whitelist (list) - list of otherwise invalid domain
+                                      names which you'd like to support.
+            allow_utf8_user (bool) - if True, the user part of the email
+                                     address can contain UTF8 characters.
+                                     False by default.
+            allow_ip_domain (bool) - if True, the domain part of the email
+                                     can be a valid IPv4 or IPv6 address.
+        """
+        self.domain_whitelist = domain_whitelist or []
+        self.allow_utf8_user = allow_utf8_user
+        self.allow_ip_domain = allow_ip_domain
+        super(EmailField, self).__init__(*args, **kwargs)
+
+    def validate_user_part(self, user_part):
+        """Validate the user part of the email address. Return True if
+        valid and False otherwise.
+        """
+        if self.allow_utf8_user:
+            return self.UTF8_USER_REGEX.match(user_part)
+        return self.USER_REGEX.match(user_part)
+
+    def validate_domain_part(self, domain_part):
+        """Validate the domain part of the email address. Return True if
+        valid and False otherwise.
+        """
+        # Skip domain validation if it's in the whitelist.
+        if domain_part in self.domain_whitelist:
+            return True
+
+        if self.DOMAIN_REGEX.match(domain_part):
+            return True
+
+        # Validate IPv4/IPv6, e.g. user@[192.168.0.1]
+        if (
+            self.allow_ip_domain and
+            domain_part[0] == '[' and
+            domain_part[-1] == ']'
+        ):
+            for addr_family in (socket.AF_INET, socket.AF_INET6):
+                try:
+                    socket.inet_pton(addr_family, domain_part[1:-1])
+                    return True
+                except (socket.error, UnicodeEncodeError):
+                    pass
+
+        return False
+
     def validate(self, value):
-        if not EmailField.EMAIL_REGEX.match(value):
-            self.error('Invalid email address: %s' % value)
         super(EmailField, self).validate(value)
 
+        if '@' not in value:
+            self.error(self.error_msg % value)
+
+        user_part, domain_part = value.rsplit('@', 1)
+
+        # Validate the user part.
+        if not self.validate_user_part(user_part):
+            self.error(self.error_msg % value)
+
+        # Validate the domain and, if invalid, see if it's IDN-encoded.
+        if not self.validate_domain_part(domain_part):
+            try:
+                domain_part = domain_part.encode('idna').decode('ascii')
+            except UnicodeError:
+                self.error(self.error_msg % value)
+            else:
+                if not self.validate_domain_part(domain_part):
+                    self.error(self.error_msg % value)
+
 
 class IntField(BaseField):
-    """An 32-bit integer field.
+    """32-bit integer field."""
-    """
 
     def __init__(self, min_value=None, max_value=None, **kwargs):
         self.min_value, self.max_value = min_value, max_value
@@ -216,8 +288,7 @@ class IntField(BaseField):
 
 
 class LongField(BaseField):
-    """An 64-bit integer field.
+    """64-bit integer field."""
-    """
 
     def __init__(self, min_value=None, max_value=None, **kwargs):
         self.min_value, self.max_value = min_value, max_value
@@ -253,8 +324,7 @@ class LongField(BaseField):
 
 
 class FloatField(BaseField):
-    """An floating point number field.
+    """Floating point number field."""
-    """
 
     def __init__(self, min_value=None, max_value=None, **kwargs):
         self.min_value, self.max_value = min_value, max_value
@@ -291,7 +361,7 @@ class FloatField(BaseField):
 
 
 class DecimalField(BaseField):
-    """A fixed-point decimal number field.
+    """Fixed-point decimal number field.
 
     .. versionchanged:: 0.8
     .. versionadded:: 0.3
@@ -332,25 +402,25 @@ class DecimalField(BaseField):
 
         # Convert to string for python 2.6 before casting to Decimal
         try:
-            value = decimal.Decimal("%s" % value)
+            value = decimal.Decimal('%s' % value)
         except decimal.InvalidOperation:
             return value
-        return value.quantize(decimal.Decimal(".%s" % ("0" * self.precision)), rounding=self.rounding)
+        return value.quantize(decimal.Decimal('.%s' % ('0' * self.precision)), rounding=self.rounding)
 
     def to_mongo(self, value):
         if value is None:
             return value
         if self.force_string:
-            return unicode(value)
+            return six.text_type(self.to_python(value))
         return float(self.to_python(value))
 
     def validate(self, value):
         if not isinstance(value, decimal.Decimal):
-            if not isinstance(value, basestring):
+            if not isinstance(value, six.string_types):
-                value = unicode(value)
+                value = six.text_type(value)
             try:
                 value = decimal.Decimal(value)
-            except Exception, exc:
+            except Exception as exc:
                 self.error('Could not convert value to decimal: %s' % exc)
 
         if self.min_value is not None and value < self.min_value:
@@ -364,7 +434,7 @@ class DecimalField(BaseField):
 
 
 class BooleanField(BaseField):
-    """A boolean field type.
+    """Boolean field type.
 
     .. versionadded:: 0.1.2
     """
@@ -382,7 +452,7 @@ class BooleanField(BaseField):
 
 
 class DateTimeField(BaseField):
-    """A datetime field.
+    """Datetime field.
 
     Uses the python-dateutil library if available alternatively use time.strptime
     to parse the dates.  Note: python-dateutil's parser is fully featured and when
@@ -410,7 +480,7 @@ class DateTimeField(BaseField):
         if callable(value):
             return value()
 
-        if not isinstance(value, basestring):
+        if not isinstance(value, six.string_types):
             return None
 
         # Attempt to parse a datetime:
@@ -537,16 +607,19 @@ class EmbeddedDocumentField(BaseField):
     """
 
     def __init__(self, document_type, **kwargs):
-        if not isinstance(document_type, basestring):
+        if not (
-            if not issubclass(document_type, EmbeddedDocument):
+            isinstance(document_type, six.string_types) or
-                self.error('Invalid embedded document class provided to an '
+            issubclass(document_type, EmbeddedDocument)
-                           'EmbeddedDocumentField')
+        ):
+            self.error('Invalid embedded document class provided to an '
+                       'EmbeddedDocumentField')
+
         self.document_type_obj = document_type
         super(EmbeddedDocumentField, self).__init__(**kwargs)
 
     @property
     def document_type(self):
-        if isinstance(self.document_type_obj, basestring):
+        if isinstance(self.document_type_obj, six.string_types):
             if self.document_type_obj == RECURSIVE_REFERENCE_CONSTANT:
                 self.document_type_obj = self.owner_document
             else:
@@ -577,8 +650,12 @@ class EmbeddedDocumentField(BaseField):
         return self.document_type._fields.get(member_name)
 
     def prepare_query_value(self, op, value):
-        if not isinstance(value, self.document_type):
+        if value is not None and not isinstance(value, self.document_type):
-            value = self.document_type._from_son(value)
+            try:
+                value = self.document_type._from_son(value)
+            except ValueError:
+                raise InvalidQueryError("Querying the embedded document '%s' failed, due to an invalid query value" %
+                                        (self.document_type._class_name,))
         super(EmbeddedDocumentField, self).prepare_query_value(op, value)
         return self.to_mongo(value)
 
@@ -631,7 +708,7 @@ class DynamicField(BaseField):
         """Convert a Python type to a MongoDB compatible type.
         """
 
-        if isinstance(value, basestring):
+        if isinstance(value, six.string_types):
             return value
 
         if hasattr(value, 'to_mongo'):
@@ -639,7 +716,7 @@ class DynamicField(BaseField):
             val = value.to_mongo(use_db_field, fields)
             # If we its a document thats not inherited add _cls
             if isinstance(value, Document):
-                val = {"_ref": value.to_dbref(), "_cls": cls.__name__}
+                val = {'_ref': value.to_dbref(), '_cls': cls.__name__}
             if isinstance(value, EmbeddedDocument):
                 val['_cls'] = cls.__name__
             return val
@@ -650,7 +727,7 @@ class DynamicField(BaseField):
         is_list = False
         if not hasattr(value, 'items'):
             is_list = True
-            value = dict([(k, v) for k, v in enumerate(value)])
+            value = {k: v for k, v in enumerate(value)}
 
         data = {}
         for k, v in value.iteritems():
@@ -674,12 +751,12 @@ class DynamicField(BaseField):
         return member_name
 
     def prepare_query_value(self, op, value):
-        if isinstance(value, basestring):
+        if isinstance(value, six.string_types):
             return StringField().prepare_query_value(op, value)
         return super(DynamicField, self).prepare_query_value(op, self.to_mongo(value))
 
     def validate(self, value, clean=True):
-        if hasattr(value, "validate"):
+        if hasattr(value, 'validate'):
             value.validate(clean=clean)
 
 
@@ -699,21 +776,27 @@ class ListField(ComplexBaseField):
         super(ListField, self).__init__(**kwargs)
 
     def validate(self, value):
-        """Make sure that a list of valid fields is being used.
+        """Make sure that a list of valid fields is being used."""
-        """
         if (not isinstance(value, (list, tuple, QuerySet)) or
-                isinstance(value, basestring)):
+                isinstance(value, six.string_types)):
             self.error('Only lists and tuples may be used in a list field')
         super(ListField, self).validate(value)
 
     def prepare_query_value(self, op, value):
         if self.field:
-            if op in ('set', 'unset', None) and (
+
-                    not isinstance(value, basestring) and
+            # If the value is iterable and it's not a string nor a
-                    not isinstance(value, BaseDocument) and
+            # BaseDocument, call prepare_query_value for each of its items.
-                    hasattr(value, '__iter__')):
+            if (
+                op in ('set', 'unset', None) and
+                hasattr(value, '__iter__') and
+                not isinstance(value, six.string_types) and
+                not isinstance(value, BaseDocument)
+            ):
                 return [self.field.prepare_query_value(op, v) for v in value]
+
             return self.field.prepare_query_value(op, value)
+
         return super(ListField, self).prepare_query_value(op, value)
 
 
@@ -726,7 +809,6 @@ class EmbeddedDocumentListField(ListField):
         :class:`~mongoengine.EmbeddedDocument`.
 
     .. versionadded:: 0.9
-
     """
 
     def __init__(self, document_type, **kwargs):
@@ -775,17 +857,17 @@ class SortedListField(ListField):
 
 
 def key_not_string(d):
-    """ Helper function to recursively determine if any key in a dictionary is
+    """Helper function to recursively determine if any key in a
-    not a string.
+    dictionary is not a string.
     """
     for k, v in d.items():
-        if not isinstance(k, basestring) or (isinstance(v, dict) and key_not_string(v)):
+        if not isinstance(k, six.string_types) or (isinstance(v, dict) and key_not_string(v)):
             return True
 
 
 def key_has_dot_or_dollar(d):
-    """ Helper function to recursively determine if any key in a dictionary
+    """Helper function to recursively determine if any key in a
-    contains a dot or a dollar sign.
+    dictionary contains a dot or a dollar sign.
     """
     for k, v in d.items():
         if ('.' in k or '$' in k) or (isinstance(v, dict) and key_has_dot_or_dollar(v)):
@@ -813,14 +895,13 @@ class DictField(ComplexBaseField):
         super(DictField, self).__init__(*args, **kwargs)
 
     def validate(self, value):
-        """Make sure that a list of valid fields is being used.
+        """Make sure that a list of valid fields is being used."""
-        """
         if not isinstance(value, dict):
             self.error('Only dictionaries may be used in a DictField')
 
         if key_not_string(value):
-            msg = ("Invalid dictionary key - documents must "
+            msg = ('Invalid dictionary key - documents must '
-                   "have only string keys")
+                   'have only string keys')
             self.error(msg)
         if key_has_dot_or_dollar(value):
             self.error('Invalid dictionary key name - keys may not contain "."'
@@ -835,14 +916,15 @@ class DictField(ComplexBaseField):
                            'istartswith', 'endswith', 'iendswith',
                            'exact', 'iexact']
 
-        if op in match_operators and isinstance(value, basestring):
+        if op in match_operators and isinstance(value, six.string_types):
             return StringField().prepare_query_value(op, value)
 
         if hasattr(self.field, 'field'):
             if op in ('set', 'unset') and isinstance(value, dict):
-                return dict(
+                return {
-                    (k, self.field.prepare_query_value(op, v))
+                    k: self.field.prepare_query_value(op, v)
-                    for k, v in value.items())
+                    for k, v in value.items()
+                }
             return self.field.prepare_query_value(op, value)
 
         return super(DictField, self).prepare_query_value(op, value)
@@ -891,10 +973,6 @@ class ReferenceField(BaseField):
 
         Foo.register_delete_rule(Bar, 'foo', NULLIFY)
 
-    .. note ::
-        `reverse_delete_rule` does not trigger pre / post delete signals to be
-        triggered.
-
     .. versionchanged:: 0.5 added `reverse_delete_rule`
     """
 
@@ -911,10 +989,12 @@ class ReferenceField(BaseField):
             A reference to an abstract document type is always stored as a
             :class:`~pymongo.dbref.DBRef`, regardless of the value of `dbref`.
         """
-        if not isinstance(document_type, basestring):
+        if (
-            if not issubclass(document_type, (Document, basestring)):
+            not isinstance(document_type, six.string_types) and
-                self.error('Argument to ReferenceField constructor must be a '
+            not issubclass(document_type, Document)
-                           'document class or a string')
+        ):
+            self.error('Argument to ReferenceField constructor must be a '
+                       'document class or a string')
 
         self.dbref = dbref
         self.document_type_obj = document_type
@@ -923,7 +1003,7 @@ class ReferenceField(BaseField):
 
     @property
     def document_type(self):
-        if isinstance(self.document_type_obj, basestring):
+        if isinstance(self.document_type_obj, six.string_types):
             if self.document_type_obj == RECURSIVE_REFERENCE_CONSTANT:
                 self.document_type_obj = self.owner_document
             else:
@@ -931,8 +1011,7 @@ class ReferenceField(BaseField):
         return self.document_type_obj
 
     def __get__(self, instance, owner):
-        """Descriptor to allow lazy dereferencing.
+        """Descriptor to allow lazy dereferencing."""
-        """
         if instance is None:
             # Document class being used rather than a document object
             return self
@@ -989,8 +1068,7 @@ class ReferenceField(BaseField):
         return id_
 
     def to_python(self, value):
-        """Convert a MongoDB-compatible type to a Python type.
+        """Convert a MongoDB-compatible type to a Python type."""
-        """
         if (not self.dbref and
                 not isinstance(value, (DBRef, Document, EmbeddedDocument))):
             collection = self.document_type._get_collection_name()
@@ -1005,8 +1083,8 @@ class ReferenceField(BaseField):
 
     def validate(self, value):
 
-        if not isinstance(value, (self.document_type, DBRef)):
+        if not isinstance(value, (self.document_type, DBRef, ObjectId)):
-            self.error("A ReferenceField only accepts DBRef or documents")
+            self.error('A ReferenceField only accepts DBRef, ObjectId or documents')
 
         if isinstance(value, Document) and value.id is None:
             self.error('You can only reference documents once they have been '
@@ -1030,14 +1108,19 @@ class CachedReferenceField(BaseField):
     .. versionadded:: 0.9
     """
 
-    def __init__(self, document_type, fields=[], auto_sync=True, **kwargs):
+    def __init__(self, document_type, fields=None, auto_sync=True, **kwargs):
         """Initialises the Cached Reference Field.
 
         :param fields:  A list of fields to be cached in document
         :param auto_sync: if True documents are auto updated.
         """
-        if not isinstance(document_type, basestring) and \
+        if fields is None:
-                not issubclass(document_type, (Document, basestring)):
+            fields = []
+
+        if (
+            not isinstance(document_type, six.string_types) and
+            not issubclass(document_type, Document)
+        ):
             self.error('Argument to CachedReferenceField constructor must be a'
                        ' document class or a string')
 
@@ -1053,18 +1136,20 @@ class CachedReferenceField(BaseField):
                                   sender=self.document_type)
 
     def on_document_pre_save(self, sender, document, created, **kwargs):
-        if not created:
+        if created:
-            update_kwargs = dict(
+            return None
-                ('set__%s__%s' % (self.name, k), v)
-                for k, v in document._delta()[0].items()
-                if k in self.fields)
 
-            if update_kwargs:
+        update_kwargs = {
-                filter_kwargs = {}
+            'set__%s__%s' % (self.name, key): val
-                filter_kwargs[self.name] = document
+            for key, val in document._delta()[0].items()
+            if key in self.fields
+        }
+        if update_kwargs:
+            filter_kwargs = {}
+            filter_kwargs[self.name] = document
 
-                self.owner_document.objects(
+            self.owner_document.objects(
-                    **filter_kwargs).update(**update_kwargs)
+                **filter_kwargs).update(**update_kwargs)
 
     def to_python(self, value):
         if isinstance(value, dict):
@@ -1077,7 +1162,7 @@ class CachedReferenceField(BaseField):
 
     @property
     def document_type(self):
-        if isinstance(self.document_type_obj, basestring):
+        if isinstance(self.document_type_obj, six.string_types):
             if self.document_type_obj == RECURSIVE_REFERENCE_CONSTANT:
                 self.document_type_obj = self.owner_document
             else:
@@ -1117,7 +1202,7 @@ class CachedReferenceField(BaseField):
             # TODO: should raise here or will fail next statement
 
         value = SON((
-            ("_id", id_field.to_mongo(id_)),
+            ('_id', id_field.to_mongo(id_)),
         ))
 
         if fields:
@@ -1143,7 +1228,7 @@ class CachedReferenceField(BaseField):
     def validate(self, value):
 
         if not isinstance(value, self.document_type):
-            self.error("A CachedReferenceField only accepts documents")
+            self.error('A CachedReferenceField only accepts documents')
 
         if isinstance(value, Document) and value.id is None:
             self.error('You can only reference documents once they have been '
@@ -1191,13 +1276,13 @@ class GenericReferenceField(BaseField):
         # Keep the choices as a list of allowed Document class names
         if choices:
             for choice in choices:
-                if isinstance(choice, basestring):
+                if isinstance(choice, six.string_types):
                     self.choices.append(choice)
                 elif isinstance(choice, type) and issubclass(choice, Document):
                     self.choices.append(choice._class_name)
                 else:
                     self.error('Invalid choices provided: must be a list of'
-                               'Document subclasses and/or basestrings')
+                               'Document subclasses and/or six.string_typess')
 
     def _validate_choices(self, value):
         if isinstance(value, dict):
@@ -1249,7 +1334,7 @@ class GenericReferenceField(BaseField):
         if document is None:
             return None
 
-        if isinstance(document, (dict, SON)):
+        if isinstance(document, (dict, SON, ObjectId, DBRef)):
             return document
 
         id_field_name = document.__class__._meta['id_field']
@@ -1280,8 +1365,7 @@ class GenericReferenceField(BaseField):
 
 
 class BinaryField(BaseField):
-    """A binary data field.
+    """A binary data field."""
-    """
 
     def __init__(self, max_bytes=None, **kwargs):
         self.max_bytes = max_bytes
@@ -1289,18 +1373,18 @@ class BinaryField(BaseField):
 
     def __set__(self, instance, value):
         """Handle bytearrays in python 3.1"""
-        if PY3 and isinstance(value, bytearray):
+        if six.PY3 and isinstance(value, bytearray):
-            value = bin_type(value)
+            value = six.binary_type(value)
         return super(BinaryField, self).__set__(instance, value)
 
     def to_mongo(self, value):
         return Binary(value)
 
     def validate(self, value):
-        if not isinstance(value, (bin_type, txt_type, Binary)):
+        if not isinstance(value, (six.binary_type, six.text_type, Binary)):
-            self.error("BinaryField only accepts instances of "
+            self.error('BinaryField only accepts instances of '
-                       "(%s, %s, Binary)" % (
+                       '(%s, %s, Binary)' % (
-                           bin_type.__name__, txt_type.__name__))
+                           six.binary_type.__name__, six.text_type.__name__))
 
         if self.max_bytes is not None and len(value) > self.max_bytes:
             self.error('Binary value is too long')
@@ -1384,11 +1468,13 @@ class GridFSProxy(object):
                 get_db(self.db_alias), self.collection_name)
         return self._fs
 
-    def get(self, id=None):
+    def get(self, grid_id=None):
-        if id:
+        if grid_id:
-            self.grid_id = id
+            self.grid_id = grid_id
+
         if self.grid_id is None:
             return None
+
         try:
             if self.gridout is None:
                 self.gridout = self.fs.get(self.grid_id)
@@ -1432,7 +1518,7 @@ class GridFSProxy(object):
             try:
                 return gridout.read(size)
             except Exception:
-                return ""
+                return ''
 
     def delete(self):
         # Delete file from GridFS, FileField still remains
@@ -1464,9 +1550,8 @@ class FileField(BaseField):
     """
     proxy_class = GridFSProxy
 
-    def __init__(self,
+    def __init__(self, db_alias=DEFAULT_CONNECTION_NAME, collection_name='fs',
-                 db_alias=DEFAULT_CONNECTION_NAME,
+                 **kwargs):
-                 collection_name="fs", **kwargs):
         super(FileField, self).__init__(**kwargs)
         self.collection_name = collection_name
         self.db_alias = db_alias
@@ -1488,8 +1573,10 @@ class FileField(BaseField):
 
     def __set__(self, instance, value):
         key = self.name
-        if ((hasattr(value, 'read') and not
+        if (
-                isinstance(value, GridFSProxy)) or isinstance(value, str_types)):
+            (hasattr(value, 'read') and not isinstance(value, GridFSProxy)) or
+            isinstance(value, (six.binary_type, six.string_types))
+        ):
             # using "FileField() = file/string" notation
             grid_file = instance._data.get(self.name)
             # If a file already exists, delete it
@@ -1558,7 +1645,7 @@ class ImageGridFsProxy(GridFSProxy):
         try:
             img = Image.open(file_obj)
             img_format = img.format
-        except Exception, e:
+        except Exception as e:
             raise ValidationError('Invalid image: %s' % e)
 
         # Progressive JPEG
@@ -1667,10 +1754,10 @@ class ImageGridFsProxy(GridFSProxy):
             return self.fs.get(out.thumbnail_id)
 
     def write(self, *args, **kwargs):
-        raise RuntimeError("Please use \"put\" method instead")
+        raise RuntimeError('Please use "put" method instead')
 
     def writelines(self, *args, **kwargs):
-        raise RuntimeError("Please use \"put\" method instead")
+        raise RuntimeError('Please use "put" method instead')
 
 
 class ImproperlyConfigured(Exception):
@@ -1695,14 +1782,17 @@ class ImageField(FileField):
     def __init__(self, size=None, thumbnail_size=None,
                  collection_name='images', **kwargs):
         if not Image:
-            raise ImproperlyConfigured("PIL library was not found")
+            raise ImproperlyConfigured('PIL library was not found')
 
         params_size = ('width', 'height', 'force')
-        extra_args = dict(size=size, thumbnail_size=thumbnail_size)
+        extra_args = {
+            'size': size,
+            'thumbnail_size': thumbnail_size
+        }
         for att_name, att in extra_args.items():
             value = None
             if isinstance(att, (tuple, list)):
-                if PY3:
+                if six.PY3:
                     value = dict(itertools.zip_longest(params_size, att,
                                                        fillvalue=None))
                 else:
@@ -1763,10 +1853,10 @@ class SequenceField(BaseField):
         Generate and Increment the counter
         """
         sequence_name = self.get_sequence_name()
-        sequence_id = "%s.%s" % (sequence_name, self.name)
+        sequence_id = '%s.%s' % (sequence_name, self.name)
         collection = get_db(alias=self.db_alias)[self.collection_name]
-        counter = collection.find_and_modify(query={"_id": sequence_id},
+        counter = collection.find_and_modify(query={'_id': sequence_id},
-                                             update={"$inc": {"next": 1}},
+                                             update={'$inc': {'next': 1}},
                                              new=True,
                                              upsert=True)
         return self.value_decorator(counter['next'])
@@ -1789,9 +1879,9 @@ class SequenceField(BaseField):
         as it is only fixed on set.
         """
         sequence_name = self.get_sequence_name()
-        sequence_id = "%s.%s" % (sequence_name, self.name)
+        sequence_id = '%s.%s' % (sequence_name, self.name)
         collection = get_db(alias=self.db_alias)[self.collection_name]
-        data = collection.find_one({"_id": sequence_id})
+        data = collection.find_one({'_id': sequence_id})
 
         if data:
             return self.value_decorator(data['next'] + 1)
@@ -1861,8 +1951,8 @@ class UUIDField(BaseField):
         if not self._binary:
             original_value = value
             try:
-                if not isinstance(value, basestring):
+                if not isinstance(value, six.string_types):
-                    value = unicode(value)
+                    value = six.text_type(value)
                 return uuid.UUID(value)
             except Exception:
                 return original_value
@@ -1870,8 +1960,8 @@ class UUIDField(BaseField):
 
     def to_mongo(self, value):
         if not self._binary:
-            return unicode(value)
+            return six.text_type(value)
-        elif isinstance(value, basestring):
+        elif isinstance(value, six.string_types):
             return uuid.UUID(value)
         return value
 
@@ -1882,11 +1972,11 @@ class UUIDField(BaseField):
 
     def validate(self, value):
         if not isinstance(value, uuid.UUID):
-            if not isinstance(value, basestring):
+            if not isinstance(value, six.string_types):
                 value = str(value)
             try:
                 uuid.UUID(value)
-            except Exception, exc:
+            except Exception as exc:
                 self.error('Could not convert to UUID: %s' % exc)
 
 
@@ -1904,19 +1994,18 @@ class GeoPointField(BaseField):
     _geo_index = pymongo.GEO2D
 
     def validate(self, value):
-        """Make sure that a geo-value is of type (x, y)
+        """Make sure that a geo-value is of type (x, y)"""
-        """
         if not isinstance(value, (list, tuple)):
             self.error('GeoPointField can only accept tuples or lists '
                        'of (x, y)')
 
         if not len(value) == 2:
-            self.error("Value (%s) must be a two-dimensional point" %
+            self.error('Value (%s) must be a two-dimensional point' %
                        repr(value))
         elif (not isinstance(value[0], (float, int)) or
               not isinstance(value[1], (float, int))):
             self.error(
-                "Both values (%s) in point must be float or int" % repr(value))
+                'Both values (%s) in point must be float or int' % repr(value))
 
 
 class PointField(GeoJsonBaseField):
@@ -1926,8 +2015,8 @@ class PointField(GeoJsonBaseField):
 
     .. code-block:: js
 
-        { "type" : "Point" ,
+        {'type' : 'Point' ,
-          "coordinates" : [x, y]}
+         'coordinates' : [x, y]}
 
     You can either pass a dict with the full information or a list
     to set the value.
@@ -1936,7 +2025,7 @@ class PointField(GeoJsonBaseField):
 
     .. versionadded:: 0.8
     """
-    _type = "Point"
+    _type = 'Point'
 
 
 class LineStringField(GeoJsonBaseField):
@@ -1946,8 +2035,8 @@ class LineStringField(GeoJsonBaseField):
 
     .. code-block:: js
 
-        { "type" : "LineString" ,
+        {'type' : 'LineString' ,
-          "coordinates" : [[x1, y1], [x1, y1] ... [xn, yn]]}
+         'coordinates' : [[x1, y1], [x1, y1] ... [xn, yn]]}
 
     You can either pass a dict with the full information or a list of points.
 
@@ -1955,7 +2044,7 @@ class LineStringField(GeoJsonBaseField):
 
     .. versionadded:: 0.8
     """
-    _type = "LineString"
+    _type = 'LineString'
 
 
 class PolygonField(GeoJsonBaseField):
@@ -1965,9 +2054,9 @@ class PolygonField(GeoJsonBaseField):
 
     .. code-block:: js
 
-        { "type" : "Polygon" ,
+        {'type' : 'Polygon' ,
-          "coordinates" : [[[x1, y1], [x1, y1] ... [xn, yn]],
+         'coordinates' : [[[x1, y1], [x1, y1] ... [xn, yn]],
-                           [[x1, y1], [x1, y1] ... [xn, yn]]}
+                          [[x1, y1], [x1, y1] ... [xn, yn]]}
 
     You can either pass a dict with the full information or a list
     of LineStrings. The first LineString being the outside and the rest being
@@ -1977,7 +2066,7 @@ class PolygonField(GeoJsonBaseField):
 
     .. versionadded:: 0.8
     """
-    _type = "Polygon"
+    _type = 'Polygon'
 
 
 class MultiPointField(GeoJsonBaseField):
@@ -1987,8 +2076,8 @@ class MultiPointField(GeoJsonBaseField):
 
     .. code-block:: js
 
-        { "type" : "MultiPoint" ,
+        {'type' : 'MultiPoint' ,
-          "coordinates" : [[x1, y1], [x2, y2]]}
+         'coordinates' : [[x1, y1], [x2, y2]]}
 
     You can either pass a dict with the full information or a list
     to set the value.
@@ -1997,7 +2086,7 @@ class MultiPointField(GeoJsonBaseField):
 
     .. versionadded:: 0.9
     """
-    _type = "MultiPoint"
+    _type = 'MultiPoint'
 
 
 class MultiLineStringField(GeoJsonBaseField):
@@ -2007,9 +2096,9 @@ class MultiLineStringField(GeoJsonBaseField):
 
     .. code-block:: js
 
-        { "type" : "MultiLineString" ,
+        {'type' : 'MultiLineString' ,
-          "coordinates" : [[[x1, y1], [x1, y1] ... [xn, yn]],
+         'coordinates' : [[[x1, y1], [x1, y1] ... [xn, yn]],
-                           [[x1, y1], [x1, y1] ... [xn, yn]]]}
+                          [[x1, y1], [x1, y1] ... [xn, yn]]]}
 
     You can either pass a dict with the full information or a list of points.
 
@@ -2017,7 +2106,7 @@ class MultiLineStringField(GeoJsonBaseField):
 
     .. versionadded:: 0.9
     """
-    _type = "MultiLineString"
+    _type = 'MultiLineString'
 
 
 class MultiPolygonField(GeoJsonBaseField):
@@ -2027,14 +2116,14 @@ class MultiPolygonField(GeoJsonBaseField):
 
     .. code-block:: js
 
-        { "type" : "MultiPolygon" ,
+        {'type' : 'MultiPolygon' ,
-          "coordinates" : [[
+         'coordinates' : [[
-                [[x1, y1], [x1, y1] ... [xn, yn]],
+               [[x1, y1], [x1, y1] ... [xn, yn]],
-                [[x1, y1], [x1, y1] ... [xn, yn]]
+               [[x1, y1], [x1, y1] ... [xn, yn]]
-            ], [
+           ], [
-                [[x1, y1], [x1, y1] ... [xn, yn]],
+               [[x1, y1], [x1, y1] ... [xn, yn]],
-                [[x1, y1], [x1, y1] ... [xn, yn]]
+               [[x1, y1], [x1, y1] ... [xn, yn]]
-            ]
+           ]
         }
 
     You can either pass a dict with the full information or a list
@@ -2044,4 +2133,4 @@ class MultiPolygonField(GeoJsonBaseField):
 
     .. versionadded:: 0.9
     """
-    _type = "MultiPolygon"
+    _type = 'MultiPolygon'

mongoengine/python_support.py

@@ -1,7 +1,9 @@
-"""Helper functions and types to aid with Python 2.5 - 3 support."""
+"""
-
+Helper functions, constants, and types to aid with Python v2.7 - v3.x and
-import sys
+PyMongo v2.7 - v3.x support.
+"""
 import pymongo
+import six
 
 
 if pymongo.version_tuple[0] < 3:
@@ -9,29 +11,15 @@ if pymongo.version_tuple[0] < 3:
 else:
     IS_PYMONGO_3 = True
 
-PY3 = sys.version_info[0] == 3
 
-if PY3:
+# six.BytesIO resolves to StringIO.StringIO in Py2 and io.BytesIO in Py3.
-    import codecs
+StringIO = six.BytesIO
-    from io import BytesIO as StringIO
 
-    # return s converted to binary.  b('test') should be equivalent to b'test'
+# Additionally for Py2, try to use the faster cStringIO, if available
-    def b(s):
+if not six.PY3:
-        return codecs.latin_1_encode(s)[0]
-
-    bin_type = bytes
-    txt_type = str
-else:
     try:
-        from cStringIO import StringIO
+        import cStringIO
     except ImportError:
-        from StringIO import StringIO
+        pass
-
+    else:
-    # Conversion to binary only necessary in Python 3
+        StringIO = cStringIO.StringIO
-    def b(s):
-        return s
-
-    bin_type = str
-    txt_type = unicode
-
-str_types = (bin_type, txt_type)

mongoengine/queryset/__init__.py

@@ -1,11 +1,17 @@
-from mongoengine.errors import (DoesNotExist, InvalidQueryError,
+from mongoengine.errors import *
-                                MultipleObjectsReturned, NotUniqueError,
-                                OperationError)
 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__ +
+# Expose just the public subset of all imported objects and constants.
-           transform.__all__ + visitor.__all__)
+__all__ = (
+    'QuerySet', 'QuerySetNoCache', 'Q', 'queryset_manager', 'QuerySetManager',
+    'QueryFieldList', 'DO_NOTHING', 'NULLIFY', 'CASCADE', 'DENY', 'PULL',
+
+    # Errors that might be related to a queryset, mostly here for backward
+    # compatibility
+    'DoesNotExist', 'InvalidQueryError', 'MultipleObjectsReturned',
+    'NotUniqueError', 'OperationError',
+)

mongoengine/queryset/field_list.py

@@ -67,7 +67,7 @@ class QueryFieldList(object):
         return bool(self.fields)
 
     def as_dict(self):
-        field_list = dict((field, self.value) for field in self.fields)
+        field_list = {field: self.value for field in self.fields}
         if self.slice:
             field_list.update(self.slice)
         if self._id is not None:

mongoengine/queryset/queryset.py

@@ -27,9 +27,10 @@ class QuerySet(BaseQuerySet):
         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.
+        batch. Otherwise iterate the result_cache.
         """
         self._iter = True
+
         if self._has_more:
             return self._iter_results()
 
@@ -42,40 +43,56 @@ class QuerySet(BaseQuerySet):
         """
         if self._len is not None:
             return self._len
+
+        # Populate the result cache with *all* of the docs in the cursor
         if self._has_more:
-            # populate the cache
             list(self._iter_results())
 
+        # Cache the length of the complete result cache and return it
         self._len = len(self._result_cache)
         return self._len
 
     def __repr__(self):
-        """Provides the string representation of the QuerySet
+        """Provide a 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)..."
+            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.
+        Also populates the cache if there are more possible results to
-        Raises StopIteration when there are no more results"""
+        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:
+            # For all positions lower than the length of the current result
+            # cache, serve the docs straight from the cache w/o hitting the
+            # database.
+            # XXX it's VERY important to compute the len within the `while`
+            # condition because the result cache might expand mid-iteration
+            # (e.g. if we call len(qs) inside a loop that iterates over the
+            # queryset). Fortunately len(list) is O(1) in Python, so this
+            # doesn't cause performance issues.
+            while pos < len(self._result_cache):
                 yield self._result_cache[pos]
                 pos += 1
+
+            # Raise StopIteration if we already established there were no more
+            # docs in the db cursor.
             if not self._has_more:
                 raise StopIteration
+
+            # Otherwise, populate more of the cache and repeat.
             if len(self._result_cache) <= pos:
                 self._populate_cache()
 
@@ -86,12 +103,22 @@ class QuerySet(BaseQuerySet):
         """
         if self._result_cache is None:
             self._result_cache = []
-        if self._has_more:
+
-            try:
+        # Skip populating the cache if we already established there are no
-                for i in xrange(ITER_CHUNK_SIZE):
+        # more docs to pull from the database.
-                    self._result_cache.append(self.next())
+        if not self._has_more:
-            except StopIteration:
+            return
-                self._has_more = False
+
+        # Pull in ITER_CHUNK_SIZE docs from the database and store them in
+        # the result cache.
+        try:
+            for _ in xrange(ITER_CHUNK_SIZE):
+                self._result_cache.append(self.next())
+        except StopIteration:
+            # Getting this exception means there are no more docs in the
+            # db cursor. Set _has_more to False so that we can use that
+            # information in other places.
+            self._has_more = False
 
     def count(self, with_limit_and_skip=False):
         """Count the selected elements in the query.
@@ -109,13 +136,15 @@ class QuerySet(BaseQuerySet):
         return self._len
 
     def no_cache(self):
-        """Convert to a non_caching queryset
+        """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")
+            raise OperationError('QuerySet already cached')
-        return self.clone_into(QuerySetNoCache(self._document, self._collection))
+
+        return self._clone_into(QuerySetNoCache(self._document,
+                                                self._collection))
 
 
 class QuerySetNoCache(BaseQuerySet):
@@ -126,7 +155,7 @@ class QuerySetNoCache(BaseQuerySet):
 
         .. versionadded:: 0.8.3 Convert to caching queryset
         """
-        return self.clone_into(QuerySet(self._document, self._collection))
+        return self._clone_into(QuerySet(self._document, self._collection))
 
     def __repr__(self):
         """Provides the string representation of the QuerySet
@@ -137,13 +166,14 @@ class QuerySetNoCache(BaseQuerySet):
             return '.. queryset mid-iteration ..'
 
         data = []
-        for i in xrange(REPR_OUTPUT_SIZE + 1):
+        for _ 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)..."
+            data[-1] = '...(remaining elements truncated)...'
 
         self.rewind()
         return repr(data)

mongoengine/queryset/transform.py

@@ -1,9 +1,11 @@
 from collections import defaultdict
 
-from bson import SON
+from bson import ObjectId, SON
+from bson.dbref import DBRef
 import pymongo
+import six
 
-from mongoengine.base.fields import UPDATE_OPERATORS
+from mongoengine.base import UPDATE_OPERATORS
 from mongoengine.common import _import_class
 from mongoengine.connection import get_connection
 from mongoengine.errors import InvalidQueryError
@@ -26,13 +28,13 @@ MATCH_OPERATORS = (COMPARISON_OPERATORS + GEO_OPERATORS +
                    STRING_OPERATORS + CUSTOM_OPERATORS)
 
 
+# TODO make this less complex
 def query(_doc_cls=None, **kwargs):
-    """Transform a query from Django-style format to Mongo format.
+    """Transform a query from Django-style format to Mongo format."""
-    """
     mongo_query = {}
     merge_query = defaultdict(list)
     for key, value in sorted(kwargs.items()):
-        if key == "__raw__":
+        if key == '__raw__':
             mongo_query.update(value)
             continue
 
@@ -45,7 +47,7 @@ def query(_doc_cls=None, **kwargs):
             op = parts.pop()
 
         # Allow to escape operator-like field name by __
-        if len(parts) > 1 and parts[-1] == "":
+        if len(parts) > 1 and parts[-1] == '':
             parts.pop()
 
         negate = False
@@ -57,16 +59,17 @@ def query(_doc_cls=None, **kwargs):
             # Switch field names to proper names [set in Field(name='foo')]
             try:
                 fields = _doc_cls._lookup_field(parts)
-            except Exception, e:
+            except Exception as e:
                 raise InvalidQueryError(e)
             parts = []
 
             CachedReferenceField = _import_class('CachedReferenceField')
+            GenericReferenceField = _import_class('GenericReferenceField')
 
             cleaned_fields = []
             for field in fields:
                 append_field = True
-                if isinstance(field, basestring):
+                if isinstance(field, six.string_types):
                     parts.append(field)
                     append_field = False
                 # is last and CachedReferenceField
@@ -84,9 +87,9 @@ def query(_doc_cls=None, **kwargs):
             singular_ops = [None, 'ne', 'gt', 'gte', 'lt', 'lte', 'not']
             singular_ops += STRING_OPERATORS
             if op in singular_ops:
-                if isinstance(field, basestring):
+                if isinstance(field, six.string_types):
                     if (op in STRING_OPERATORS and
-                            isinstance(value, basestring)):
+                            isinstance(value, six.string_types)):
                         StringField = _import_class('StringField')
                         value = StringField.prepare_query_value(op, value)
                     else:
@@ -98,8 +101,31 @@ def query(_doc_cls=None, **kwargs):
                         value = value['_id']
 
             elif op in ('in', 'nin', 'all', 'near') and not isinstance(value, dict):
-                # 'in', 'nin' and 'all' require a list of values
+                # Raise an error if the in/nin/all/near param is not iterable. We need a
-                value = [field.prepare_query_value(op, v) for v in value]
+                # special check for BaseDocument, because - although it's iterable - using
+                # it as such in the context of this method is most definitely a mistake.
+                BaseDocument = _import_class('BaseDocument')
+                if isinstance(value, BaseDocument):
+                    raise TypeError("When using the `in`, `nin`, `all`, or "
+                                    "`near`-operators you can\'t use a "
+                                    "`Document`, you must wrap your object "
+                                    "in a list (object -> [object]).")
+                elif not hasattr(value, '__iter__'):
+                    raise TypeError("The `in`, `nin`, `all`, or "
+                                    "`near`-operators must be applied to an "
+                                    "iterable (e.g. a list).")
+                else:
+                    value = [field.prepare_query_value(op, v) for v in value]
+
+            # If we're querying a GenericReferenceField, we need to alter the
+            # key depending on the value:
+            # * If the value is a DBRef, the key should be "field_name._ref".
+            # * If the value is an ObjectId, the key should be "field_name._ref.$id".
+            if isinstance(field, GenericReferenceField):
+                if isinstance(value, DBRef):
+                    parts[-1] += '._ref'
+                elif isinstance(value, ObjectId):
+                    parts[-1] += '._ref.$id'
 
         # if op and op not in COMPARISON_OPERATORS:
         if op:
@@ -116,10 +142,10 @@ def query(_doc_cls=None, **kwargs):
                     value = query(field.field.document_type, **value)
                 else:
                     value = field.prepare_query_value(op, value)
-                value = {"$elemMatch": value}
+                value = {'$elemMatch': value}
             elif op in CUSTOM_OPERATORS:
-                NotImplementedError("Custom method '%s' has not "
+                NotImplementedError('Custom method "%s" has not '
-                                    "been implemented" % op)
+                                    'been implemented' % op)
             elif op not in STRING_OPERATORS:
                 value = {'$' + op: value}
 
@@ -128,11 +154,13 @@ def query(_doc_cls=None, **kwargs):
 
         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):
+            if isinstance(mongo_query[key], dict):
                 mongo_query[key].update(value)
                 # $max/minDistance needs to come last - convert to SON
                 value_dict = mongo_query[key]
@@ -182,15 +210,16 @@ def query(_doc_cls=None, **kwargs):
 
 
 def update(_doc_cls=None, **update):
-    """Transform an update spec from Django-style format to Mongo format.
+    """Transform an update spec from Django-style format to Mongo
+    format.
     """
     mongo_update = {}
     for key, value in update.items():
-        if key == "__raw__":
+        if key == '__raw__':
             mongo_update.update(value)
             continue
         parts = key.split('__')
-        # if there is no operator, default to "set"
+        # if there is no operator, default to 'set'
         if len(parts) < 3 and parts[0] not in UPDATE_OPERATORS:
             parts.insert(0, 'set')
         # Check for an operator and transform to mongo-style if there is
@@ -204,26 +233,25 @@ def update(_doc_cls=None, **update):
                 # Support decrement by flipping a positive value's sign
                 # and using 'inc'
                 op = 'inc'
-                if value > 0:
+                value = -value
-                    value = -value
             elif op == 'add_to_set':
                 op = 'addToSet'
             elif op == 'set_on_insert':
-                op = "setOnInsert"
+                op = 'setOnInsert'
 
         match = None
         if parts[-1] in COMPARISON_OPERATORS:
             match = parts.pop()
 
         # Allow to escape operator-like field name by __
-        if len(parts) > 1 and parts[-1] == "":
+        if len(parts) > 1 and parts[-1] == '':
             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:
+            except Exception as e:
                 raise InvalidQueryError(e)
             parts = []
 
@@ -231,7 +259,7 @@ def update(_doc_cls=None, **update):
             appended_sub_field = False
             for field in fields:
                 append_field = True
-                if isinstance(field, basestring):
+                if isinstance(field, six.string_types):
                     # Convert the S operator to $
                     if field == 'S':
                         field = '$'
@@ -252,7 +280,7 @@ def update(_doc_cls=None, **update):
             else:
                 field = cleaned_fields[-1]
 
-            GeoJsonBaseField = _import_class("GeoJsonBaseField")
+            GeoJsonBaseField = _import_class('GeoJsonBaseField')
             if isinstance(field, GeoJsonBaseField):
                 value = field.to_mongo(value)
 
@@ -266,7 +294,7 @@ def update(_doc_cls=None, **update):
                     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":
+            elif op == 'unset':
                 value = 1
 
         if match:
@@ -276,16 +304,16 @@ def update(_doc_cls=None, **update):
         key = '.'.join(parts)
 
         if not op:
-            raise InvalidQueryError("Updates must supply an operation "
+            raise InvalidQueryError('Updates must supply an operation '
-                                    "eg: set__FIELD=value")
+                                    '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 "
+                raise InvalidQueryError('pullAll operations only support '
-                                        "a single field depth")
+                                        '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]
@@ -296,7 +324,7 @@ def update(_doc_cls=None, **update):
                 # Then process as normal
                 last_listField = len(
                     cleaned_fields) - field_classes.index(ListField)
-                key = ".".join(parts[:last_listField])
+                key = '.'.join(parts[:last_listField])
                 parts = parts[last_listField:]
                 parts.insert(0, key)
 
@@ -304,7 +332,7 @@ def update(_doc_cls=None, **update):
             for key in parts:
                 value = {key: value}
         elif op == 'addToSet' and isinstance(value, list):
-            value = {key: {"$each": value}}
+            value = {key: {'$each': value}}
         else:
             value = {key: value}
         key = '$' + op
@@ -318,78 +346,82 @@ def update(_doc_cls=None, **update):
 
 
 def _geo_operator(field, op, value):
-    """Helper to return the query for a given geo query"""
+    """Helper to return the query for a given geo query."""
-    if op == "max_distance":
+    if op == 'max_distance':
         value = {'$maxDistance': value}
-    elif op == "min_distance":
+    elif op == 'min_distance':
         value = {'$minDistance': value}
     elif field._geo_index == pymongo.GEO2D:
-        if op == "within_distance":
+        if op == 'within_distance':
             value = {'$within': {'$center': value}}
-        elif op == "within_spherical_distance":
+        elif op == 'within_spherical_distance':
             value = {'$within': {'$centerSphere': value}}
-        elif op == "within_polygon":
+        elif op == 'within_polygon':
             value = {'$within': {'$polygon': value}}
-        elif op == "near":
+        elif op == 'near':
             value = {'$near': value}
-        elif op == "near_sphere":
+        elif op == 'near_sphere':
             value = {'$nearSphere': value}
         elif op == 'within_box':
             value = {'$within': {'$box': value}}
         else:
-            raise NotImplementedError("Geo method '%s' has not "
+            raise NotImplementedError('Geo method "%s" has not been '
-                                      "been implemented for a GeoPointField" % op)
+                                      'implemented for a GeoPointField' % op)
     else:
-        if op == "geo_within":
+        if op == 'geo_within':
-            value = {"$geoWithin": _infer_geometry(value)}
+            value = {'$geoWithin': _infer_geometry(value)}
-        elif op == "geo_within_box":
+        elif op == 'geo_within_box':
-            value = {"$geoWithin": {"$box": value}}
+            value = {'$geoWithin': {'$box': value}}
-        elif op == "geo_within_polygon":
+        elif op == 'geo_within_polygon':
-            value = {"$geoWithin": {"$polygon": value}}
+            value = {'$geoWithin': {'$polygon': value}}
-        elif op == "geo_within_center":
+        elif op == 'geo_within_center':
-            value = {"$geoWithin": {"$center": value}}
+            value = {'$geoWithin': {'$center': value}}
-        elif op == "geo_within_sphere":
+        elif op == 'geo_within_sphere':
-            value = {"$geoWithin": {"$centerSphere": value}}
+            value = {'$geoWithin': {'$centerSphere': value}}
-        elif op == "geo_intersects":
+        elif op == 'geo_intersects':
-            value = {"$geoIntersects": _infer_geometry(value)}
+            value = {'$geoIntersects': _infer_geometry(value)}
-        elif op == "near":
+        elif op == 'near':
             value = {'$near': _infer_geometry(value)}
         else:
-            raise NotImplementedError("Geo method '%s' has not "
+            raise NotImplementedError(
-                                      "been implemented for a %s " % (op, field._name))
+                '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"""
+    """Helper method that tries to infer the $geometry shape for a
+    given value.
+    """
     if isinstance(value, dict):
-        if "$geometry" in value:
+        if '$geometry' in value:
             return value
         elif 'coordinates' in value and 'type' in value:
-            return {"$geometry": value}
+            return {'$geometry': value}
-        raise InvalidQueryError("Invalid $geometry dictionary should have "
+        raise InvalidQueryError('Invalid $geometry dictionary should have '
-                                "type and coordinates keys")
+                                'type and coordinates keys')
     elif isinstance(value, (list, set)):
         # TODO: shouldn't we test value[0][0][0][0] to see if it is MultiPolygon?
         # TODO: should both TypeError and IndexError be alike interpreted?
 
         try:
             value[0][0][0]
-            return {"$geometry": {"type": "Polygon", "coordinates": value}}
+            return {'$geometry': {'type': 'Polygon', 'coordinates': value}}
         except (TypeError, IndexError):
             pass
 
         try:
             value[0][0]
-            return {"$geometry": {"type": "LineString", "coordinates": value}}
+            return {'$geometry': {'type': 'LineString', 'coordinates': value}}
         except (TypeError, IndexError):
             pass
 
         try:
             value[0]
-            return {"$geometry": {"type": "Point", "coordinates": value}}
+            return {'$geometry': {'type': 'Point', 'coordinates': value}}
         except (TypeError, IndexError):
             pass
 
-    raise InvalidQueryError("Invalid $geometry data. Can be either a dictionary "
+    raise InvalidQueryError('Invalid $geometry data. Can be either a '
-                            "or (nested) lists of coordinate(s)")
+                            'dictionary or (nested) lists of coordinate(s)')

mongoengine/queryset/visitor.py

@@ -69,9 +69,9 @@ class QueryCompilerVisitor(QNodeVisitor):
         self.document = document
 
     def visit_combination(self, combination):
-        operator = "$and"
+        operator = '$and'
         if combination.operation == combination.OR:
-            operator = "$or"
+            operator = '$or'
         return {operator: combination.children}
 
     def visit_query(self, query):
@@ -79,8 +79,7 @@ class QueryCompilerVisitor(QNodeVisitor):
 
 
 class QNode(object):
-    """Base class for nodes in query trees.
+    """Base class for nodes in query trees."""
-    """
 
     AND = 0
     OR = 1
@@ -94,7 +93,8 @@ class QNode(object):
         raise NotImplementedError
 
     def _combine(self, other, operation):
-        """Combine this node with another node into a QCombination object.
+        """Combine this node with another node into a QCombination
+        object.
         """
         if getattr(other, 'empty', True):
             return self
@@ -116,8 +116,8 @@ class QNode(object):
 
 
 class QCombination(QNode):
-    """Represents the combination of several conditions by a given logical
+    """Represents the combination of several conditions by a given
-    operator.
+    logical operator.
     """
 
     def __init__(self, operation, children):

mongoengine/signals.py

@@ -1,7 +1,5 @@
-# -*- coding: utf-8 -*-
+__all__ = ('pre_init', 'post_init', 'pre_save', 'pre_save_post_validation',
-
+           'post_save', 'pre_delete', 'post_delete')
-__all__ = ['pre_init', 'post_init', 'pre_save', 'pre_save_post_validation',
-           'post_save', 'pre_delete', 'post_delete']
 
 signals_available = False
 try:
@@ -34,6 +32,7 @@ except ImportError:
             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()

requirements.txt

@@ -3,3 +3,5 @@ pymongo>=2.7.1
 six==1.10.0
 flake8
 flake8-import-order
+Sphinx==1.5.5
+sphinx-rtd-theme==0.2.4

setup.cfg

@@ -1,13 +1,11 @@
 [nosetests]
-verbosity = 2
+verbosity=2
-detailed-errors = 1
+detailed-errors=1
-cover-erase = 1
+tests=tests
-cover-branches = 1
+cover-package=mongoengine
-cover-package = mongoengine
-tests = tests
 
 [flake8]
 ignore=E501,F401,F403,F405,I201
-exclude=build,dist,docs,venv,.tox,.eggs,tests
+exclude=build,dist,docs,venv,venv3,.tox,.eggs,tests
-max-complexity=42
+max-complexity=47
 application-import-names=mongoengine,tests

setup.py

@@ -21,8 +21,9 @@ except Exception:
 
 
 def get_version(version_tuple):
-    if not isinstance(version_tuple[-1], int):
+    """Return the version tuple as a string, e.g. for (0, 10, 7),
-        return '.'.join(map(str, version_tuple[:-1])) + version_tuple[-1]
+    return '0.10.7'.
+    """
     return '.'.join(map(str, version_tuple))
 
 
@@ -41,31 +42,29 @@ CLASSIFIERS = [
     '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 :: 3.2",
     "Programming Language :: Python :: 3.3",
     "Programming Language :: Python :: 3.4",
+    "Programming Language :: Python :: 3.5",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
     'Topic :: Database',
     'Topic :: Software Development :: Libraries :: Python Modules',
 ]
 
-extra_opts = {"packages": find_packages(exclude=["tests", "tests.*"])}
+extra_opts = {
+    'packages': find_packages(exclude=['tests', 'tests.*']),
+    'tests_require': ['nose', 'coverage==4.2', 'blinker', 'Pillow>=2.0.0']
+}
 if sys.version_info[0] == 3:
     extra_opts['use_2to3'] = True
-    extra_opts['tests_require'] = ['nose', 'coverage==3.7.1', 'blinker', 'Pillow>=2.0.0']
+    if 'test' in sys.argv or 'nosetests' in sys.argv:
-    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"]}
+        extra_opts['package_data'] = {
+            'tests': ['fields/mongoengine.png', 'fields/mongodb_leaf.png']}
 else:
-    # coverage 4 does not support Python 3.2 anymore
+    extra_opts['tests_require'] += ['python-dateutil']
-    extra_opts['tests_require'] = ['nose', 'coverage==3.7.1', 'blinker', 'Pillow>=2.0.0', 'python-dateutil']
-
-    if sys.version_info[0] == 2 and sys.version_info[1] == 6:
-        extra_opts['tests_require'].append('unittest2')
 
 setup(
     name='mongoengine',

tests/__init__.py

@@ -2,4 +2,3 @@ from all_warnings import AllWarnings
 from document import *
 from queryset import *
 from fields import *
-from migration import *

tests/all_warnings/__init__.py

@@ -3,8 +3,6 @@ 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
 

tests/document/__init__.py

@@ -1,5 +1,3 @@
-import sys
-sys.path[0:0] = [""]
 import unittest
 
 from class_methods import *

tests/document/class_methods.py

@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-import sys
-sys.path[0:0] = [""]
 import unittest
 
 from mongoengine import *

tests/document/delta.py

@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-import sys
-sys.path[0:0] = [""]
 import unittest
 
 from bson import SON

tests/document/dynamic.py

@@ -1,6 +1,4 @@
 import unittest
-import sys
-sys.path[0:0] = [""]
 
 from mongoengine import *
 from mongoengine.connection import get_db
@@ -143,11 +141,9 @@ class DynamicTest(unittest.TestCase):
 
     def test_three_level_complex_data_lookups(self):
         """Ensure you can query three level document dynamic fields"""
-        p = self.Person()
+        p = self.Person.objects.create(
-        p.misc = {'hello': {'hello2': 'world'}}
+            misc={'hello': {'hello2': 'world'}}
-        p.save()
+        )
-        # from pprint import pprint as pp; import pdb; pdb.set_trace();
-        print self.Person.objects(misc__hello__hello2='world')
         self.assertEqual(1, self.Person.objects(misc__hello__hello2='world').count())
 
     def test_complex_embedded_document_validation(self):

tests/document/indexes.py

@@ -2,26 +2,22 @@
 import unittest
 import sys
 
-sys.path[0:0] = [""]
-
-import pymongo
-from random import randint
-
 from nose.plugins.skip import SkipTest
 from datetime import datetime
+import pymongo
 
 from mongoengine import *
-from mongoengine.connection import get_db, get_connection
+from mongoengine.connection import get_db
+
+from tests.utils import get_mongodb_version, needs_mongodb_v26
 
 __all__ = ("IndexesTest", )
 
 
 class IndexesTest(unittest.TestCase):
-    _MAX_RAND = 10 ** 10
 
     def setUp(self):
-        self.db_name = 'mongoenginetest_IndexesTest_' + str(randint(0, self._MAX_RAND))
+        self.connection = connect(db='mongoenginetest')
-        self.connection = connect(db=self.db_name)
         self.db = get_db()
 
         class Person(Document):
@@ -416,7 +412,6 @@ class IndexesTest(unittest.TestCase):
         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
@@ -438,7 +433,6 @@ class IndexesTest(unittest.TestCase):
 
         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
@@ -465,7 +459,6 @@ class IndexesTest(unittest.TestCase):
         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):
 
@@ -498,8 +491,7 @@ class IndexesTest(unittest.TestCase):
         obj = Test(a=1)
         obj.save()
 
-        connection = get_connection()
+        IS_MONGODB_3 = get_mongodb_version()[0] >= 3
-        IS_MONGODB_3 = connection.server_info()['versionArray'][0] >= 3
 
         # Need to be explicit about covered indexes as mongoDB doesn't know if
         # the documents returned might have more keys in that here.
@@ -560,8 +552,8 @@ class IndexesTest(unittest.TestCase):
 
         BlogPost.drop_collection()
 
-        for i in xrange(0, 10):
+        for i in range(0, 10):
-            tags = [("tag %i" % n) for n in xrange(0, i % 2)]
+            tags = [("tag %i" % n) for n in range(0, i % 2)]
             BlogPost(tags=tags).save()
 
         self.assertEqual(BlogPost.objects.count(), 10)
@@ -627,8 +619,6 @@ class IndexesTest(unittest.TestCase):
         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.
         """
@@ -656,8 +646,6 @@ class IndexesTest(unittest.TestCase):
                          sub=SubDocument(year=2010, slug='test'))
         self.assertRaises(NotUniqueError, post3.save)
 
-        BlogPost.drop_collection()
-
     def test_unique_embedded_document_in_list(self):
         """
         Ensure that the uniqueness constraints are applied to fields in
@@ -688,8 +676,6 @@ class IndexesTest(unittest.TestCase):
 
         self.assertRaises(NotUniqueError, post2.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.
@@ -723,8 +709,6 @@ class IndexesTest(unittest.TestCase):
                          sub=SubDocument(year=2009, slug='test-1'))
         self.assertRaises(NotUniqueError, post3.save)
 
-        BlogPost.drop_collection()
-
     def test_ttl_indexes(self):
 
         class Log(Document):
@@ -737,14 +721,6 @@ class IndexesTest(unittest.TestCase):
 
         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()
@@ -772,13 +748,11 @@ class IndexesTest(unittest.TestCase):
             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()
@@ -794,8 +768,23 @@ class IndexesTest(unittest.TestCase):
         self.assertEqual(User.objects.count(), 1)
         self.assertEqual(User.objects.get().password, 'secret2')
 
+    def test_unique_and_primary_create(self):
+        """Create a new record with a duplicate primary key
+        throws an exception
+        """
+        class User(Document):
+            name = StringField(primary_key=True)
+            password = StringField()
+
         User.drop_collection()
 
+        User.objects.create(name='huangz', password='secret')
+        with self.assertRaises(NotUniqueError):
+            User.objects.create(name='huangz', password='secret2')
+
+        self.assertEqual(User.objects.count(), 1)
+        self.assertEqual(User.objects.get().password, 'secret')
+
     def test_index_with_pk(self):
         """Ensure you can use `pk` as part of a query"""
 
@@ -878,8 +867,8 @@ class IndexesTest(unittest.TestCase):
                          info['provider_ids.foo_1_provider_ids.bar_1']['key'])
         self.assertTrue(info['provider_ids.foo_1_provider_ids.bar_1']['sparse'])
 
+    @needs_mongodb_v26
     def test_text_indexes(self):
-
         class Book(Document):
             title = DictField()
             meta = {

tests/document/inheritance.py

@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-import sys
-sys.path[0:0] = [""]
 import unittest
 import warnings
 
@@ -253,19 +251,17 @@ class InheritanceTest(unittest.TestCase):
         self.assertEqual(classes, [Human])
 
     def test_allow_inheritance(self):
-        """Ensure that inheritance may be disabled on simple classes and that
+        """Ensure that inheritance is disabled by default on simple
-        _cls and _subclasses will not be used.
+        classes and that _cls will not be used.
         """
-
         class Animal(Document):
             name = StringField()
 
-        def create_dog_class():
+        # can't inherit because Animal didn't explicitly allow inheritance
+        with self.assertRaises(ValueError):
             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'])
@@ -275,17 +271,15 @@ class InheritanceTest(unittest.TestCase):
         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
+        """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():
+        with self.assertRaises(ValueError):
             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
@@ -298,10 +292,9 @@ class InheritanceTest(unittest.TestCase):
         class Animal(FinalDocument):
             name = StringField()
 
-        def create_mammal_class():
+        with self.assertRaises(ValueError):
             class Mammal(Animal):
                 pass
-        self.assertRaises(ValueError, create_mammal_class)
 
         # Check that _cls isn't present in simple documents
         doc = Animal(name='dog')
@@ -360,29 +353,26 @@ class InheritanceTest(unittest.TestCase):
         self.assertEqual(berlin.pk, berlin.auto_id_0)
 
     def test_abstract_document_creation_does_not_fail(self):
-
         class City(Document):
             continent = StringField()
             meta = {'abstract': True,
                     'allow_inheritance': False}
+
         bkk = City(continent='asia')
         self.assertEqual(None, bkk.pk)
         # TODO: expected error? Shouldn't we create a new error type?
-        self.assertRaises(KeyError, lambda: setattr(bkk, 'pk', 1))
+        with self.assertRaises(KeyError):
+            setattr(bkk, 'pk', 1)
 
     def test_allow_inheritance_embedded_document(self):
-        """Ensure embedded documents respect inheritance
+        """Ensure embedded documents respect inheritance."""
-        """
-
         class Comment(EmbeddedDocument):
             content = StringField()
 
-        def create_special_comment():
+        with self.assertRaises(ValueError):
             class SpecialComment(Comment):
                 pass
 
-        self.assertRaises(ValueError, create_special_comment)
-
         doc = Comment(content='test')
         self.assertFalse('_cls' in doc.to_mongo())
 
@@ -454,11 +444,11 @@ class InheritanceTest(unittest.TestCase):
         self.assertEqual(Guppy._get_collection_name(), 'fish')
         self.assertEqual(Human._get_collection_name(), 'human')
 
-        def create_bad_abstract():
+        # ensure that a subclass of a non-abstract class can't be abstract
+        with self.assertRaises(ValueError):
             class EvilHuman(Human):
                 evil = BooleanField(default=True)
                 meta = {'abstract': True}
-        self.assertRaises(ValueError, create_bad_abstract)
 
     def test_abstract_embedded_documents(self):
         # 789: EmbeddedDocument shouldn't inherit abstract

tests/document/json_serialisation.py

@@ -1,6 +1,3 @@
-import sys
-sys.path[0:0] = [""]
-
 import unittest
 import uuid
 

tests/document/validation.py

@@ -1,7 +1,4 @@
 # -*- coding: utf-8 -*-
-import sys
-sys.path[0:0] = [""]
-
 import unittest
 from datetime import datetime
 
@@ -60,7 +57,7 @@ class ValidatorErrorTest(unittest.TestCase):
 
         try:
             User().validate()
-        except ValidationError, e:
+        except ValidationError as e:
             self.assertTrue("User:None" in e.message)
             self.assertEqual(e.to_dict(), {
                 'username': 'Field is required',
@@ -70,7 +67,7 @@ class ValidatorErrorTest(unittest.TestCase):
         user.name = None
         try:
             user.save()
-        except ValidationError, e:
+        except ValidationError as e:
             self.assertTrue("User:RossC0" in e.message)
             self.assertEqual(e.to_dict(), {
                 'name': 'Field is required'})
@@ -118,7 +115,7 @@ class ValidatorErrorTest(unittest.TestCase):
 
         try:
             Doc(id="bad").validate()
-        except ValidationError, e:
+        except ValidationError as e:
             self.assertTrue("SubDoc:None" in e.message)
             self.assertEqual(e.to_dict(), {
                 "e": {'val': 'OK could not be converted to int'}})
@@ -136,7 +133,7 @@ class ValidatorErrorTest(unittest.TestCase):
         doc.e.val = "OK"
         try:
             doc.save()
-        except ValidationError, e:
+        except ValidationError as e:
             self.assertTrue("Doc:test" in e.message)
             self.assertEqual(e.to_dict(), {
                 "e": {'val': 'OK could not be converted to int'}})
@@ -156,14 +153,14 @@ class ValidatorErrorTest(unittest.TestCase):
 
         s = SubDoc()
 
-        self.assertRaises(ValidationError, lambda: s.validate())
+        self.assertRaises(ValidationError, s.validate)
 
         d1.e = s
         d2.e = s
 
         del d1
 
-        self.assertRaises(ValidationError, lambda: d2.validate())
+        self.assertRaises(ValidationError, d2.validate)
 
     def test_parent_reference_in_child_document(self):
         """

tests/fields/file_tests.py

@@ -1,18 +1,16 @@
 # -*- coding: utf-8 -*-
-import sys
-sys.path[0:0] = [""]
-
 import copy
 import os
 import unittest
 import tempfile
 
 import gridfs
+import six
 
 from nose.plugins.skip import SkipTest
 from mongoengine import *
 from mongoengine.connection import get_db
-from mongoengine.python_support import b, StringIO
+from mongoengine.python_support import StringIO
 
 try:
     from PIL import Image
@@ -20,15 +18,13 @@ try:
 except ImportError:
     HAS_PIL = False
 
+from tests.utils import MongoDBTestCase
+
 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):
+class FileTest(MongoDBTestCase):
-
-    def setUp(self):
-        connect(db='mongoenginetest')
-        self.db = get_db()
 
     def tearDown(self):
         self.db.drop_collection('fs.files')
@@ -49,7 +45,7 @@ class FileTest(unittest.TestCase):
 
         PutFile.drop_collection()
 
-        text = b('Hello, World!')
+        text = six.b('Hello, World!')
         content_type = 'text/plain'
 
         putfile = PutFile()
@@ -88,8 +84,8 @@ class FileTest(unittest.TestCase):
 
         StreamFile.drop_collection()
 
-        text = b('Hello, World!')
+        text = six.b('Hello, World!')
-        more_text = b('Foo Bar')
+        more_text = six.b('Foo Bar')
         content_type = 'text/plain'
 
         streamfile = StreamFile()
@@ -123,8 +119,8 @@ class FileTest(unittest.TestCase):
 
         StreamFile.drop_collection()
 
-        text = b('Hello, World!')
+        text = six.b('Hello, World!')
-        more_text = b('Foo Bar')
+        more_text = six.b('Foo Bar')
         content_type = 'text/plain'
 
         streamfile = StreamFile()
@@ -155,8 +151,8 @@ class FileTest(unittest.TestCase):
         class SetFile(Document):
             the_file = FileField()
 
-        text = b('Hello, World!')
+        text = six.b('Hello, World!')
-        more_text = b('Foo Bar')
+        more_text = six.b('Foo Bar')
 
         SetFile.drop_collection()
 
@@ -185,7 +181,7 @@ class FileTest(unittest.TestCase):
         GridDocument.drop_collection()
 
         with tempfile.TemporaryFile() as f:
-            f.write(b("Hello World!"))
+            f.write(six.b("Hello World!"))
             f.flush()
 
             # Test without default
@@ -202,7 +198,7 @@ class FileTest(unittest.TestCase):
             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 = GridDocument(the_file=six.b(''))
             doc_d.save()
 
             doc_e = GridDocument.objects.with_id(doc_d.id)
@@ -228,7 +224,7 @@ class FileTest(unittest.TestCase):
         # First instance
         test_file = TestFile()
         test_file.name = "Hello, World!"
-        test_file.the_file.put(b('Hello, World!'))
+        test_file.the_file.put(six.b('Hello, World!'))
         test_file.save()
 
         # Second instance
@@ -282,7 +278,7 @@ class FileTest(unittest.TestCase):
 
         test_file = TestFile()
         self.assertFalse(bool(test_file.the_file))
-        test_file.the_file.put(b('Hello, World!'), content_type='text/plain')
+        test_file.the_file.put(six.b('Hello, World!'), content_type='text/plain')
         test_file.save()
         self.assertTrue(bool(test_file.the_file))
 
@@ -297,66 +293,66 @@ class FileTest(unittest.TestCase):
         test_file = TestFile()
         self.assertFalse(test_file.the_file in [{"test": 1}])
 
-    def test_file_disk_space(self): 
+    def test_file_disk_space(self):
-        """ Test disk space usage when we delete/replace a file """ 
+        """ Test disk space usage when we delete/replace a file """
         class TestFile(Document):
             the_file = FileField()
-            
+
-        text = b('Hello, World!')
+        text = six.b('Hello, World!')
         content_type = 'text/plain'
 
         testfile = TestFile()
         testfile.the_file.put(text, content_type=content_type, filename="hello")
         testfile.save()
-        
+
-        # Now check fs.files and fs.chunks 
+        # Now check fs.files and fs.chunks
         db = TestFile._get_db()
-        
+
         files = db.fs.files.find()
         chunks = db.fs.chunks.find()
         self.assertEquals(len(list(files)), 1)
         self.assertEquals(len(list(chunks)), 1)
 
-        # Deleting the docoument should delete the files 
+        # Deleting the docoument should delete the files
         testfile.delete()
-        
+
         files = db.fs.files.find()
         chunks = db.fs.chunks.find()
         self.assertEquals(len(list(files)), 0)
         self.assertEquals(len(list(chunks)), 0)
-        
+
-        # Test case where we don't store a file in the first place 
+        # Test case where we don't store a file in the first place
         testfile = TestFile()
         testfile.save()
-        
+
         files = db.fs.files.find()
         chunks = db.fs.chunks.find()
         self.assertEquals(len(list(files)), 0)
         self.assertEquals(len(list(chunks)), 0)
-        
+
         testfile.delete()
-        
+
         files = db.fs.files.find()
         chunks = db.fs.chunks.find()
         self.assertEquals(len(list(files)), 0)
         self.assertEquals(len(list(chunks)), 0)
-        
+
-        # Test case where we overwrite the file 
+        # Test case where we overwrite the file
         testfile = TestFile()
         testfile.the_file.put(text, content_type=content_type, filename="hello")
         testfile.save()
-        
+
-        text = b('Bonjour, World!')
+        text = six.b('Bonjour, World!')
         testfile.the_file.replace(text, content_type=content_type, filename="hello")
         testfile.save()
-        
+
         files = db.fs.files.find()
         chunks = db.fs.chunks.find()
         self.assertEquals(len(list(files)), 1)
         self.assertEquals(len(list(chunks)), 1)
-        
+
         testfile.delete()
-        
+
         files = db.fs.files.find()
         chunks = db.fs.chunks.find()
         self.assertEquals(len(list(files)), 0)
@@ -372,14 +368,14 @@ class FileTest(unittest.TestCase):
         TestImage.drop_collection()
 
         with tempfile.TemporaryFile() as f:
-            f.write(b("Hello World!"))
+            f.write(six.b("Hello World!"))
             f.flush()
 
             t = TestImage()
             try:
                 t.image.put(f)
                 self.fail("Should have raised an invalidation error")
-            except ValidationError, e:
+            except ValidationError as e:
                 self.assertEqual("%s" % e, "Invalid image: cannot identify image file %s" % f)
 
         t = TestImage()
@@ -496,7 +492,7 @@ class FileTest(unittest.TestCase):
         # First instance
         test_file = TestFile()
         test_file.name = "Hello, World!"
-        test_file.the_file.put(b('Hello, World!'),
+        test_file.the_file.put(six.b('Hello, World!'),
                           name="hello.txt")
         test_file.save()
 
@@ -504,16 +500,15 @@ class FileTest(unittest.TestCase):
         self.assertEqual(data.get('name'), 'hello.txt')
 
         test_file = TestFile.objects.first()
-        self.assertEqual(test_file.the_file.read(),
+        self.assertEqual(test_file.the_file.read(), six.b('Hello, World!'))
-                          b('Hello, World!'))
 
         test_file = TestFile.objects.first()
-        test_file.the_file = b('HELLO, WORLD!')
+        test_file.the_file = six.b('HELLO, WORLD!')
         test_file.save()
 
         test_file = TestFile.objects.first()
         self.assertEqual(test_file.the_file.read(),
-                          b('HELLO, WORLD!'))
+                         six.b('HELLO, WORLD!'))
 
     def test_copyable(self):
         class PutFile(Document):
@@ -521,7 +516,7 @@ class FileTest(unittest.TestCase):
 
         PutFile.drop_collection()
 
-        text = b('Hello, World!')
+        text = six.b('Hello, World!')
         content_type = 'text/plain'
 
         putfile = PutFile()

tests/fields/geo.py

@@ -1,7 +1,4 @@
 # -*- coding: utf-8 -*-
-import sys
-sys.path[0:0] = [""]
-
 import unittest
 
 from mongoengine import *

tests/migration/__init__.py

@@ -1,11 +0,0 @@
-import unittest
-
-from convert_to_new_inheritance_model import *
-from decimalfield_as_float import *
-from referencefield_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

@@ -1,51 +0,0 @@
-# -*- 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

@@ -1,50 +0,0 @@
- # -*- 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/referencefield_dbref_to_object_id.py

@@ -1,52 +0,0 @@
-# -*- 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

@@ -1,62 +0,0 @@
-# -*- 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

@@ -1,48 +0,0 @@
-# -*- 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/field_list.py

@@ -1,6 +1,3 @@
-import sys
-sys.path[0:0] = [""]
-
 import unittest
 
 from mongoengine import *
@@ -95,7 +92,7 @@ class OnlyExcludeAllTest(unittest.TestCase):
         exclude = ['d', 'e']
         only = ['b', 'c']
 
-        qs = MyDoc.objects.fields(**dict(((i, 1) for i in include)))
+        qs = MyDoc.objects.fields(**{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)
@@ -103,14 +100,14 @@ class OnlyExcludeAllTest(unittest.TestCase):
         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 = MyDoc.objects.fields(**{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)))
+        qs = qs.fields(**{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})
@@ -129,7 +126,7 @@ class OnlyExcludeAllTest(unittest.TestCase):
         exclude = ['d', 'e']
         only = ['b', 'c']
 
-        qs = MyDoc.objects.fields(**dict(((i, 1) for i in include)))
+        qs = MyDoc.objects.fields(**{i: 1 for i in include})
         qs = qs.exclude(*exclude)
         qs = qs.only(*only)
         qs = qs.fields(slice__b=5)
@@ -144,6 +141,16 @@ class OnlyExcludeAllTest(unittest.TestCase):
         self.assertEqual(qs._loaded_fields.as_dict(),
                          {'b': {'$slice': 5}})
 
+    def test_mix_slice_with_other_fields(self):
+        class MyDoc(Document):
+            a = ListField()
+            b = ListField()
+            c = ListField()
+
+        qs = MyDoc.objects.fields(a=1, b=0, slice__c=2)
+        self.assertEqual(qs._loaded_fields.as_dict(),
+                         {'c': {'$slice': 2}, 'a': 1})
+
     def test_only(self):
         """Ensure that QuerySet.only only returns the requested fields.
         """

tests/queryset/geo.py

@@ -1,109 +1,139 @@
-import sys
+import datetime
-
-sys.path[0:0] = [""]
-
 import unittest
-from datetime import datetime, timedelta
 
-from pymongo.errors import OperationFailure
 from mongoengine import *
-from mongoengine.connection import get_connection
+
-from nose.plugins.skip import SkipTest
+from tests.utils import MongoDBTestCase, needs_mongodb_v3
 
 
 __all__ = ("GeoQueriesTest",)
 
 
-class GeoQueriesTest(unittest.TestCase):
+class GeoQueriesTest(MongoDBTestCase):
 
-    def setUp(self):
+    def _create_event_data(self, point_field_class=GeoPointField):
-        connect(db='mongoenginetest')
+        """Create some sample data re-used in many of the tests below."""
-
-    def test_geospatial_operators(self):
-        """Ensure that geospatial queries are working.
-        """
         class Event(Document):
             title = StringField()
             date = DateTimeField()
-            location = GeoPointField()
+            location = point_field_class()
 
             def __unicode__(self):
                 return self.title
 
+        self.Event = Event
+
         Event.drop_collection()
 
-        event1 = Event(title="Coltrane Motion @ Double Door",
+        event1 = Event.objects.create(
-                       date=datetime.now() - timedelta(days=1),
+            title="Coltrane Motion @ Double Door",
-                       location=[-87.677137, 41.909889]).save()
+            date=datetime.datetime.now() - datetime.timedelta(days=1),
-        event2 = Event(title="Coltrane Motion @ Bottom of the Hill",
+            location=[-87.677137, 41.909889])
-                       date=datetime.now() - timedelta(days=10),
+        event2 = Event.objects.create(
-                       location=[-122.4194155, 37.7749295]).save()
+            title="Coltrane Motion @ Bottom of the Hill",
-        event3 = Event(title="Coltrane Motion @ Empty Bottle",
+            date=datetime.datetime.now() - datetime.timedelta(days=10),
-                       date=datetime.now(),
+            location=[-122.4194155, 37.7749295])
-                       location=[-87.686638, 41.900474]).save()
+        event3 = Event.objects.create(
+            title="Coltrane Motion @ Empty Bottle",
+            date=datetime.datetime.now(),
+            location=[-87.686638, 41.900474])
+
+        return event1, event2, event3
+
+    def test_near(self):
+        """Make sure the "near" operator works."""
+        event1, event2, event3 = self._create_event_data()
 
         # 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])
+        events = self.Event.objects(location__near=[-87.67892, 41.9120459])
         self.assertEqual(events.count(), 3)
         self.assertEqual(list(events), [event1, event3, event2])
 
+        # ensure ordering is respected by "near"
+        events = self.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])
+
+    def test_near_and_max_distance(self):
+        """Ensure the "max_distance" operator works alongside the "near"
+        operator.
+        """
+        event1, event2, event3 = self._create_event_data()
+
+        # find events within 10 degrees of san francisco
+        point = [-122.415579, 37.7566023]
+        events = self.Event.objects(location__near=point,
+                                    location__max_distance=10)
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0], event2)
+
+    # $minDistance was added in MongoDB v2.6, but continued being buggy
+    # until v3.0; skip for older versions
+    @needs_mongodb_v3
+    def test_near_and_min_distance(self):
+        """Ensure the "min_distance" operator works alongside the "near"
+        operator.
+        """
+        event1, event2, event3 = self._create_event_data()
+
+        # find events at least 10 degrees away of san francisco
+        point = [-122.415579, 37.7566023]
+        events = self.Event.objects(location__near=point,
+                                    location__min_distance=10)
+        self.assertEqual(events.count(), 2)
+
+    def test_within_distance(self):
+        """Make sure the "within_distance" operator works."""
+        event1, event2, event3 = self._create_event_data()
+
         # 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)
+        events = self.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 at least 10 degrees away of san francisco
-        point = [-122.415579, 37.7566023]
-        events = Event.objects(location__near=point, location__min_distance=10)
-        # The following real test passes on MongoDB 3 but minDistance seems
-        # buggy on older MongoDB versions
-        if get_connection().server_info()['versionArray'][0] > 2:
-            self.assertEqual(events.count(), 2)
-        else:
-            self.assertTrue(events.count() >= 2)
-
         # 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)
+        events = self.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)
+        events = self.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 = self.Event.objects(
+            location__within_distance=point_and_distance)
         events = events.order_by("-date")
         self.assertEqual(events.count(), 2)
         self.assertEqual(events[0], event3)
 
+    def test_within_box(self):
+        """Ensure the "within_box" operator works."""
+        event1, event2, event3 = self._create_event_data()
+
         # check that within_box works
         box = [(-125.0, 35.0), (-100.0, 40.0)]
-        events = Event.objects(location__within_box=box)
+        events = self.Event.objects(location__within_box=box)
         self.assertEqual(events.count(), 1)
         self.assertEqual(events[0].id, event2.id)
 
+    def test_within_polygon(self):
+        """Ensure the "within_polygon" operator works."""
+        event1, event2, event3 = self._create_event_data()
+
         polygon = [
             (-87.694445, 41.912114),
             (-87.69084, 41.919395),
@@ -111,7 +141,7 @@ class GeoQueriesTest(unittest.TestCase):
             (-87.654276, 41.911731),
             (-87.656164, 41.898061),
         ]
-        events = Event.objects(location__within_polygon=polygon)
+        events = self.Event.objects(location__within_polygon=polygon)
         self.assertEqual(events.count(), 1)
         self.assertEqual(events[0].id, event1.id)
 
@@ -120,13 +150,151 @@ class GeoQueriesTest(unittest.TestCase):
             (-1.225891, 52.792797),
             (-4.40094, 53.389881)
         ]
-        events = Event.objects(location__within_polygon=polygon2)
+        events = self.Event.objects(location__within_polygon=polygon2)
         self.assertEqual(events.count(), 0)
 
-    def test_geo_spatial_embedded(self):
+    def test_2dsphere_near(self):
+        """Make sure the "near" operator works with a PointField, which
+        corresponds to a 2dsphere index.
+        """
+        event1, event2, event3 = self._create_event_data(
+            point_field_class=PointField
+        )
 
+        # find all events "near" pitchfork office, chicago.
+        # note that "near" will show the san francisco event, too,
+        # although it sorts to last.
+        events = self.Event.objects(location__near=[-87.67892, 41.9120459])
+        self.assertEqual(events.count(), 3)
+        self.assertEqual(list(events), [event1, event3, event2])
+
+        # ensure ordering is respected by "near"
+        events = self.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])
+
+    def test_2dsphere_near_and_max_distance(self):
+        """Ensure the "max_distance" operator works alongside the "near"
+        operator with a 2dsphere index.
+        """
+        event1, event2, event3 = self._create_event_data(
+            point_field_class=PointField
+        )
+
+        # find events within 10km of san francisco
+        point = [-122.415579, 37.7566023]
+        events = self.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 = self.Event.objects(location__near=[-73.9509714, 40.7237134],
+                                    location__max_distance=1000)
+        self.assertEqual(events.count(), 0)
+
+        # ensure ordering is respected by "near"
+        events = self.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)
+
+    def test_2dsphere_geo_within_box(self):
+        """Ensure the "geo_within_box" operator works with a 2dsphere
+        index.
+        """
+        event1, event2, event3 = self._create_event_data(
+            point_field_class=PointField
+        )
+
+        # check that within_box works
+        box = [(-125.0, 35.0), (-100.0, 40.0)]
+        events = self.Event.objects(location__geo_within_box=box)
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0].id, event2.id)
+
+    def test_2dsphere_geo_within_polygon(self):
+        """Ensure the "geo_within_polygon" operator works with a
+        2dsphere index.
+        """
+        event1, event2, event3 = self._create_event_data(
+            point_field_class=PointField
+        )
+
+        polygon = [
+            (-87.694445, 41.912114),
+            (-87.69084, 41.919395),
+            (-87.681742, 41.927186),
+            (-87.654276, 41.911731),
+            (-87.656164, 41.898061),
+        ]
+        events = self.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 = self.Event.objects(location__geo_within_polygon=polygon2)
+        self.assertEqual(events.count(), 0)
+
+    # $minDistance was added in MongoDB v2.6, but continued being buggy
+    # until v3.0; skip for older versions
+    @needs_mongodb_v3
+    def test_2dsphere_near_and_min_max_distance(self):
+        """Ensure "min_distace" and "max_distance" operators work well
+        together with the "near" operator in a 2dsphere index.
+        """
+        event1, event2, event3 = self._create_event_data(
+            point_field_class=PointField
+        )
+
+        # ensure min_distance and max_distance combine well
+        events = self.Event.objects(
+            location__near=[-87.67892, 41.9120459],
+            location__min_distance=1000,
+            location__max_distance=10000
+        ).order_by("-date")
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0], event3)
+
+        # ensure ordering is respected by "near" with "min_distance"
+        events = self.Event.objects(
+            location__near=[-87.67892, 41.9120459],
+            location__min_distance=10000
+        ).order_by("-date")
+        self.assertEqual(events.count(), 1)
+        self.assertEqual(events[0], event2)
+
+    def test_2dsphere_geo_within_center(self):
+        """Make sure the "geo_within_center" operator works with a
+        2dsphere index.
+        """
+        event1, event2, event3 = self._create_event_data(
+            point_field_class=PointField
+        )
+
+        # find events within 5 degrees of pitchfork office, chicago
+        point_and_distance = [[-87.67892, 41.9120459], 2]
+        events = self.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)
+
+    def _test_embedded(self, point_field_class):
+        """Helper test method ensuring given point field class works
+        well in an embedded document.
+        """
         class Venue(EmbeddedDocument):
-            location = GeoPointField()
+            location = point_field_class()
             name = StringField()
 
         class Event(Document):
@@ -152,16 +320,18 @@ class GeoQueriesTest(unittest.TestCase):
         self.assertEqual(events.count(), 3)
         self.assertEqual(list(events), [event1, event3, event2])
 
-    def test_spherical_geospatial_operators(self):
+    def test_geo_spatial_embedded(self):
-        """Ensure that spherical geospatial queries are working
+        """Make sure GeoPointField works properly in an embedded document."""
-        """
+        self._test_embedded(point_field_class=GeoPointField)
-        # Needs MongoDB > 2.6.4 https://jira.mongodb.org/browse/SERVER-14039
-        connection = get_connection()
-        info = connection.test.command('buildInfo')
-        mongodb_version = tuple([int(i) for i in info['version'].split('.')])
-        if mongodb_version < (2, 6, 4):
-            raise SkipTest("Need MongoDB version 2.6.4+")
 
+    def test_2dsphere_point_embedded(self):
+        """Make sure PointField works properly in an embedded document."""
+        self._test_embedded(point_field_class=PointField)
+
+    # Needs MongoDB > 2.6.4 https://jira.mongodb.org/browse/SERVER-14039
+    @needs_mongodb_v3
+    def test_spherical_geospatial_operators(self):
+        """Ensure that spherical geospatial queries are working."""
         class Point(Document):
             location = GeoPointField()
 
@@ -181,7 +351,10 @@ class GeoQueriesTest(unittest.TestCase):
 
         # Same behavior for _within_spherical_distance
         points = Point.objects(
-            location__within_spherical_distance=[[-122, 37.5], 60 / earth_radius]
+            location__within_spherical_distance=[
+                [-122, 37.5],
+                60 / earth_radius
+            ]
         )
         self.assertEqual(points.count(), 2)
 
@@ -198,14 +371,9 @@ class GeoQueriesTest(unittest.TestCase):
         # Test query works with min_distance, being farer from one point
         points = Point.objects(location__near_sphere=[-122, 37.8],
                                location__min_distance=60 / earth_radius)
-        # The following real test passes on MongoDB 3 but minDistance seems
+        self.assertEqual(points.count(), 1)
-        # buggy on older MongoDB versions
+        far_point = points.first()
-        if get_connection().server_info()['versionArray'][0] > 2:
+        self.assertNotEqual(close_point, far_point)
-            self.assertEqual(points.count(), 1)
-            far_point = points.first()
-            self.assertNotEqual(close_point, far_point)
-        else:
-            self.assertTrue(points.count() >= 1)
 
         # Finds both points, but orders the north point first because it's
         # closer to the reference point to the north.
@@ -224,141 +392,15 @@ class GeoQueriesTest(unittest.TestCase):
         # 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])
+            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)
-
-        # ensure min_distance and max_distance combine well
-        events = Event.objects(location__near=[-87.67892, 41.9120459],
-                               location__min_distance=1000,
-                               location__max_distance=10000).order_by("-date")
-        self.assertEqual(events.count(), 1)
-        self.assertEqual(events[0], event3)
-
-        # ensure ordering is respected by "near"
-        events = Event.objects(location__near=[-87.67892, 41.9120459],
-                               # location__min_distance=10000
-                               location__min_distance=10000).order_by("-date")
-        self.assertEqual(events.count(), 1)
-        self.assertEqual(events[0], event2)
-
-        # 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()
@@ -414,7 +456,6 @@ class GeoQueriesTest(unittest.TestCase):
         self.assertEqual(1, roads)
 
     def test_polygon(self):
-
         class Road(Document):
             name = StringField()
             poly = PolygonField()
@@ -511,5 +552,6 @@ class GeoQueriesTest(unittest.TestCase):
         loc = Location.objects.as_pymongo()[0]
         self.assertEqual(loc["poly"], {"type": "Polygon", "coordinates": [[[40, 4], [40, 6], [41, 6], [40, 4]]]})
 
+
 if __name__ == '__main__':
     unittest.main()

tests/queryset/modify.py

@@ -1,6 +1,3 @@
-import sys
-sys.path[0:0] = [""]
-
 import unittest
 
 from mongoengine import connect, Document, IntField
@@ -99,4 +96,4 @@ class FindAndModifyTest(unittest.TestCase):
 
 
 if __name__ == '__main__':
-    unittest.main()
+    unittest.main()

tests/queryset/transform.py

@@ -238,7 +238,8 @@ class TransformTest(unittest.TestCase):
         box = [(35.0, -125.0), (40.0, -100.0)]
         # I *meant* to execute location__within_box=box
         events = Event.objects(location__within=box)
-        self.assertRaises(InvalidQueryError, lambda: events.count())
+        with self.assertRaises(InvalidQueryError):
+            events.count()
 
 
 if __name__ == '__main__':

tests/queryset/visitor.py

@@ -185,7 +185,7 @@ class QTest(unittest.TestCase):
             x = IntField()
 
         TestDoc.drop_collection()
-        for i in xrange(1, 101):
+        for i in range(1, 101):
             t = TestDoc(x=i)
             t.save()
 
@@ -268,14 +268,13 @@ class QTest(unittest.TestCase):
         self.assertEqual(self.Person.objects(Q(age__in=[20, 30])).count(), 3)
 
         # Test invalid query objs
-        def wrong_query_objs():
+        with self.assertRaises(InvalidQueryError):
             self.Person.objects('user1')
 
-        def wrong_query_objs_filter():
+        # filter should fail, too
-            self.Person.objects('user1')
+        with self.assertRaises(InvalidQueryError):
+            self.Person.objects.filter('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.

tests/test_connection.py

@@ -1,9 +1,6 @@
-import sys
 import datetime
 from pymongo.errors import OperationFailure
 
-sys.path[0:0] = [""]
-
 try:
     import unittest2 as unittest
 except ImportError:
@@ -19,7 +16,8 @@ from mongoengine import (
 )
 from mongoengine.python_support import IS_PYMONGO_3
 import mongoengine.connection
-from mongoengine.connection import get_db, get_connection, ConnectionError
+from mongoengine.connection import (MongoEngineConnectionError, get_db,
+                                    get_connection)
 
 
 def get_tz_awareness(connection):
@@ -37,8 +35,7 @@ class ConnectionTest(unittest.TestCase):
         mongoengine.connection._dbs = {}
 
     def test_connect(self):
-        """Ensure that the connect() method works properly.
+        """Ensure that the connect() method works properly."""
-        """
         connect('mongoenginetest')
 
         conn = get_connection()
@@ -148,8 +145,7 @@ class ConnectionTest(unittest.TestCase):
         self.assertEqual(expected_connection, actual_connection)
 
     def test_connect_uri(self):
-        """Ensure that the connect() method works properly with uri's
+        """Ensure that the connect() method works properly with URIs."""
-        """
         c = connect(db='mongoenginetest', alias='admin')
         c.admin.system.users.remove({})
         c.mongoenginetest.system.users.remove({})
@@ -159,7 +155,10 @@ class ConnectionTest(unittest.TestCase):
         c.mongoenginetest.add_user("username", "password")
 
         if not IS_PYMONGO_3:
-            self.assertRaises(ConnectionError, connect, "testdb_uri_bad", host='mongodb://test:password@localhost')
+            self.assertRaises(
+                MongoEngineConnectionError, connect, 'testdb_uri_bad',
+                host='mongodb://test:password@localhost'
+            )
 
         connect("testdb_uri", host='mongodb://username:password@localhost/mongoenginetest')
 
@@ -174,19 +173,9 @@ class ConnectionTest(unittest.TestCase):
         c.mongoenginetest.system.users.remove({})
 
     def test_connect_uri_without_db(self):
-        """Ensure connect() method works properly with uri's without database_name
+        """Ensure connect() method works properly if the URI doesn't
+        include a 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")
-
-        if not IS_PYMONGO_3:
-            self.assertRaises(ConnectionError, connect, "testdb_uri_bad", host='mongodb://test:password@localhost')
-
         connect("mongoenginetest", host='mongodb://localhost/')
 
         conn = get_connection()
@@ -196,13 +185,35 @@ class ConnectionTest(unittest.TestCase):
         self.assertTrue(isinstance(db, pymongo.database.Database))
         self.assertEqual(db.name, 'mongoenginetest')
 
-        c.admin.system.users.remove({})
+    def test_connect_uri_default_db(self):
-        c.mongoenginetest.system.users.remove({})
+        """Ensure connect() defaults to the right database name if
+        the URI and the database_name don't explicitly specify it.
+        """
+        connect(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, 'test')
+
+    def test_uri_without_credentials_doesnt_override_conn_settings(self):
+        """Ensure connect() uses the username & password params if the URI
+        doesn't explicitly specify them.
+        """
+        c = connect(host='mongodb://localhost/mongoenginetest',
+                    username='user',
+                    password='pass')
+
+        # OperationFailure means that mongoengine attempted authentication
+        # w/ the provided username/password and failed - that's the desired
+        # behavior. If the MongoDB URI would override the credentials
+        self.assertRaises(OperationFailure, get_db)
 
     def test_connect_uri_with_authsource(self):
-        """Ensure that the connect() method works well with
+        """Ensure that the connect() method works well with `authSource`
-        the option `authSource` in URI.
+        option in the URI.
-        This feature was introduced in MongoDB 2.4 and removed in 2.6
         """
         # Create users
         c = connect('mongoenginetest')
@@ -211,36 +222,38 @@ class ConnectionTest(unittest.TestCase):
 
         # Authentication fails without "authSource"
         if IS_PYMONGO_3:
-            test_conn = connect('mongoenginetest', alias='test1',
+            test_conn = connect(
-                                host='mongodb://username2:password@localhost/mongoenginetest')
+                'mongoenginetest', alias='test1',
+                host='mongodb://username2:password@localhost/mongoenginetest'
+            )
             self.assertRaises(OperationFailure, test_conn.server_info)
         else:
             self.assertRaises(
-                ConnectionError, connect, 'mongoenginetest', alias='test1',
+                MongoEngineConnectionError,
+                connect, 'mongoenginetest', alias='test1',
                 host='mongodb://username2:password@localhost/mongoenginetest'
             )
-            self.assertRaises(ConnectionError, get_db, 'test1')
+            self.assertRaises(MongoEngineConnectionError, get_db, 'test1')
 
         # Authentication succeeds with "authSource"
-        connect(
+        authd_conn = connect(
             'mongoenginetest', alias='test2',
             host=('mongodb://username2:password@localhost/'
                   'mongoenginetest?authSource=admin')
         )
-        # This will fail starting from MongoDB 2.6+
         db = get_db('test2')
         self.assertTrue(isinstance(db, pymongo.database.Database))
         self.assertEqual(db.name, 'mongoenginetest')
 
         # Clear all users
-        c.admin.system.users.remove({})
+        authd_conn.admin.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)
+        self.assertRaises(MongoEngineConnectionError, get_connection)
         conn = get_connection('testdb')
         self.assertTrue(isinstance(conn, pymongo.mongo_client.MongoClient))
 
@@ -257,8 +270,7 @@ class ConnectionTest(unittest.TestCase):
         self.assertTrue(isinstance(conn, pymongo.mongo_client.MongoClient))
 
     def test_connection_kwargs(self):
-        """Ensure that connection kwargs get passed to pymongo.
+        """Ensure that connection kwargs get passed to pymongo."""
-        """
         connect('mongoenginetest', alias='t1', tz_aware=True)
         conn = get_connection('t1')
 
@@ -268,6 +280,77 @@ class ConnectionTest(unittest.TestCase):
         conn = get_connection('t2')
         self.assertFalse(get_tz_awareness(conn))
 
+    def test_connection_pool_via_kwarg(self):
+        """Ensure we can specify a max connection pool size using
+        a connection kwarg.
+        """
+        # Use "max_pool_size" or "maxpoolsize" depending on PyMongo version
+        # (former was changed to the latter as described in
+        # https://jira.mongodb.org/browse/PYTHON-854).
+        # TODO remove once PyMongo < 3.0 support is dropped
+        if pymongo.version_tuple[0] >= 3:
+            pool_size_kwargs = {'maxpoolsize': 100}
+        else:
+            pool_size_kwargs = {'max_pool_size': 100}
+
+        conn = connect('mongoenginetest', alias='max_pool_size_via_kwarg', **pool_size_kwargs)
+        self.assertEqual(conn.max_pool_size, 100)
+
+    def test_connection_pool_via_uri(self):
+        """Ensure we can specify a max connection pool size using
+        an option in a connection URI.
+        """
+        if pymongo.version_tuple[0] == 2 and pymongo.version_tuple[1] < 9:
+            raise SkipTest('maxpoolsize as a URI option is only supported in PyMongo v2.9+')
+
+        conn = connect(host='mongodb://localhost/test?maxpoolsize=100', alias='max_pool_size_via_uri')
+        self.assertEqual(conn.max_pool_size, 100)
+
+    def test_write_concern(self):
+        """Ensure write concern can be specified in connect() via
+        a kwarg or as part of the connection URI.
+        """
+        conn1 = connect(alias='conn1', host='mongodb://localhost/testing?w=1&j=true')
+        conn2 = connect('testing', alias='conn2', w=1, j=True)
+        if IS_PYMONGO_3:
+            self.assertEqual(conn1.write_concern.document, {'w': 1, 'j': True})
+            self.assertEqual(conn2.write_concern.document, {'w': 1, 'j': True})
+        else:
+            self.assertEqual(dict(conn1.write_concern), {'w': 1, 'j': True})
+            self.assertEqual(dict(conn2.write_concern), {'w': 1, 'j': True})
+
+    def test_connect_with_replicaset_via_uri(self):
+        """Ensure connect() works when specifying a replicaSet via the
+        MongoDB URI.
+        """
+        if IS_PYMONGO_3:
+            c = connect(host='mongodb://localhost/test?replicaSet=local-rs')
+            db = get_db()
+            self.assertTrue(isinstance(db, pymongo.database.Database))
+            self.assertEqual(db.name, 'test')
+        else:
+            # PyMongo < v3.x raises an exception:
+            # "localhost:27017 is not a member of replica set local-rs"
+            with self.assertRaises(MongoEngineConnectionError):
+                c = connect(host='mongodb://localhost/test?replicaSet=local-rs')
+
+    def test_connect_with_replicaset_via_kwargs(self):
+        """Ensure connect() works when specifying a replicaSet via the
+        connection kwargs
+        """
+        if IS_PYMONGO_3:
+            c = connect(replicaset='local-rs')
+            self.assertEqual(c._MongoClient__options.replica_set_name,
+                             'local-rs')
+            db = get_db()
+            self.assertTrue(isinstance(db, pymongo.database.Database))
+            self.assertEqual(db.name, 'test')
+        else:
+            # PyMongo < v3.x raises an exception:
+            # "localhost:27017 is not a member of replica set local-rs"
+            with self.assertRaises(MongoEngineConnectionError):
+                c = connect(replicaset='local-rs')
+
     def test_datetime(self):
         connect('mongoenginetest', tz_aware=True)
         d = datetime.datetime(2010, 5, 5, tzinfo=utc)

tests/test_context_managers.py

@@ -1,5 +1,3 @@
-import sys
-sys.path[0:0] = [""]
 import unittest
 
 from mongoengine import *
@@ -79,7 +77,7 @@ class ContextManagersTest(unittest.TestCase):
         User.drop_collection()
         Group.drop_collection()
 
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             User(name='user %s' % i).save()
 
         user = User.objects.first()
@@ -117,7 +115,7 @@ class ContextManagersTest(unittest.TestCase):
         User.drop_collection()
         Group.drop_collection()
 
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             User(name='user %s' % i).save()
 
         user = User.objects.first()
@@ -195,7 +193,7 @@ class ContextManagersTest(unittest.TestCase):
         with query_counter() as q:
             self.assertEqual(0, q)
 
-            for i in xrange(1, 51):
+            for i in range(1, 51):
                 db.test.find({}).count()
 
             self.assertEqual(50, q)

tests/test_datastructures.py

@@ -1,5 +1,6 @@
 import unittest
-from mongoengine.base.datastructures import StrictDict, SemiStrictDict 
+
+from mongoengine.base.datastructures import StrictDict, SemiStrictDict
 
 
 class TestStrictDict(unittest.TestCase):
@@ -13,9 +14,18 @@ class TestStrictDict(unittest.TestCase):
         d = self.dtype(a=1, b=1, c=1)
         self.assertEqual((d.a, d.b, d.c), (1, 1, 1))
 
+    def test_repr(self):
+        d = self.dtype(a=1, b=2, c=3)
+        self.assertEqual(repr(d), '{"a": 1, "b": 2, "c": 3}')
+
+        # make sure quotes are escaped properly
+        d = self.dtype(a='"', b="'", c="")
+        self.assertEqual(repr(d), '{"a": \'"\', "b": "\'", "c": \'\'}')
+
     def test_init_fails_on_nonexisting_attrs(self):
-        self.assertRaises(AttributeError, lambda: self.dtype(a=1, b=2, d=3))
+        with self.assertRaises(AttributeError):
-        
+            self.dtype(a=1, b=2, d=3)
+
     def test_eq(self):
         d = self.dtype(a=1, b=1, c=1)
         dd = self.dtype(a=1, b=1, c=1)
@@ -24,7 +34,7 @@ class TestStrictDict(unittest.TestCase):
         g = self.strict_dict_class(("a", "b", "c", "d"))(a=1, b=1, c=1, d=1)
         h = self.strict_dict_class(("a", "c", "b"))(a=1, b=1, c=1)
         i = self.strict_dict_class(("a", "c", "b"))(a=1, b=1, c=2)
-        
+
         self.assertEqual(d, dd)
         self.assertNotEqual(d, e)
         self.assertNotEqual(d, f)
@@ -37,20 +47,18 @@ class TestStrictDict(unittest.TestCase):
         d = self.dtype()
         d.a = 1
         self.assertEqual(d.a, 1)
-        self.assertRaises(AttributeError, lambda: d.b)
+        self.assertRaises(AttributeError, getattr, d, 'b')
-    
+
     def test_setattr_raises_on_nonexisting_attr(self):
         d = self.dtype()
-
+        with self.assertRaises(AttributeError):
-        def _f():
             d.x = 1
-        self.assertRaises(AttributeError, _f)
+
-    
     def test_setattr_getattr_special(self):
         d = self.strict_dict_class(["items"])
         d.items = 1
         self.assertEqual(d.items, 1)
-    
+
     def test_get(self):
         d = self.dtype(a=1)
         self.assertEqual(d.get('a'), 1)
@@ -88,7 +96,7 @@ class TestSemiSrictDict(TestStrictDict):
     def test_init_succeeds_with_nonexisting_attrs(self):
         d = self.dtype(a=1, b=1, c=1, x=2)
         self.assertEqual((d.a, d.b, d.c, d.x), (1, 1, 1, 2))
-   
+
     def test_iter_with_nonexisting_attrs(self):
         d = self.dtype(a=1, b=1, c=1, x=2)
         self.assertEqual(list(d), ['a', 'b', 'c', 'x'])

tests/test_dereference.py

@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-import sys
-sys.path[0:0] = [""]
 import unittest
 
 from bson import DBRef, ObjectId
@@ -32,7 +30,7 @@ class FieldTest(unittest.TestCase):
         User.drop_collection()
         Group.drop_collection()
 
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             user = User(name='user %s' % i)
             user.save()
 
@@ -90,7 +88,7 @@ class FieldTest(unittest.TestCase):
         User.drop_collection()
         Group.drop_collection()
 
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             user = User(name='user %s' % i)
             user.save()
 
@@ -162,7 +160,7 @@ class FieldTest(unittest.TestCase):
         User.drop_collection()
         Group.drop_collection()
 
-        for i in xrange(1, 26):
+        for i in range(1, 26):
             user = User(name='user %s' % i)
             user.save()
 
@@ -440,7 +438,7 @@ class FieldTest(unittest.TestCase):
         Group.drop_collection()
 
         members = []
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             a = UserA(name='User A %s' % i)
             a.save()
 
@@ -531,7 +529,7 @@ class FieldTest(unittest.TestCase):
         Group.drop_collection()
 
         members = []
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             a = UserA(name='User A %s' % i)
             a.save()
 
@@ -614,15 +612,15 @@ class FieldTest(unittest.TestCase):
         Group.drop_collection()
 
         members = []
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             user = User(name='user %s' % i)
             user.save()
             members.append(user)
 
-        group = Group(members=dict([(str(u.id), u) for u in members]))
+        group = Group(members={str(u.id): u for u in members})
         group.save()
 
-        group = Group(members=dict([(str(u.id), u) for u in members]))
+        group = Group(members={str(u.id): u for u in members})
         group.save()
 
         with query_counter() as q:
@@ -687,7 +685,7 @@ class FieldTest(unittest.TestCase):
         Group.drop_collection()
 
         members = []
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             a = UserA(name='User A %s' % i)
             a.save()
 
@@ -699,9 +697,9 @@ class FieldTest(unittest.TestCase):
 
             members += [a, b, c]
 
-        group = Group(members=dict([(str(u.id), u) for u in members]))
+        group = Group(members={str(u.id): u for u in members})
         group.save()
-        group = Group(members=dict([(str(u.id), u) for u in members]))
+        group = Group(members={str(u.id): u for u in members})
         group.save()
 
         with query_counter() as q:
@@ -783,16 +781,16 @@ class FieldTest(unittest.TestCase):
         Group.drop_collection()
 
         members = []
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             a = UserA(name='User A %s' % i)
             a.save()
 
             members += [a]
 
-        group = Group(members=dict([(str(u.id), u) for u in members]))
+        group = Group(members={str(u.id): u for u in members})
         group.save()
 
-        group = Group(members=dict([(str(u.id), u) for u in members]))
+        group = Group(members={str(u.id): u for u in members})
         group.save()
 
         with query_counter() as q:
@@ -866,7 +864,7 @@ class FieldTest(unittest.TestCase):
         Group.drop_collection()
 
         members = []
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             a = UserA(name='User A %s' % i)
             a.save()
 
@@ -878,9 +876,9 @@ class FieldTest(unittest.TestCase):
 
             members += [a, b, c]
 
-        group = Group(members=dict([(str(u.id), u) for u in members]))
+        group = Group(members={str(u.id): u for u in members})
         group.save()
-        group = Group(members=dict([(str(u.id), u) for u in members]))
+        group = Group(members={str(u.id): u for u in members})
         group.save()
 
         with query_counter() as q:
@@ -1103,7 +1101,7 @@ class FieldTest(unittest.TestCase):
         User.drop_collection()
         Group.drop_collection()
 
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             User(name='user %s' % i).save()
 
         Group(name="Test", members=User.objects).save()
@@ -1132,7 +1130,7 @@ class FieldTest(unittest.TestCase):
         User.drop_collection()
         Group.drop_collection()
 
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             User(name='user %s' % i).save()
 
         Group(name="Test", members=User.objects).save()
@@ -1169,7 +1167,7 @@ class FieldTest(unittest.TestCase):
         Group.drop_collection()
 
         members = []
-        for i in xrange(1, 51):
+        for i in range(1, 51):
             a = UserA(name='User A %s' % i).save()
             b = UserB(name='User B %s' % i).save()
             c = UserC(name='User C %s' % i).save()

tests/test_replicaset_connection.py

@@ -1,6 +1,3 @@
-import sys
-
-sys.path[0:0] = [""]
 import unittest
 
 from pymongo import ReadPreference
@@ -18,7 +15,7 @@ else:
 
 import mongoengine
 from mongoengine import *
-from mongoengine.connection import ConnectionError
+from mongoengine.connection import MongoEngineConnectionError
 
 
 class ConnectionTest(unittest.TestCase):
@@ -41,7 +38,7 @@ class ConnectionTest(unittest.TestCase):
             conn = connect(db='mongoenginetest',
                            host="mongodb://localhost/mongoenginetest?replicaSet=rs",
                            read_preference=READ_PREF)
-        except ConnectionError, e:
+        except MongoEngineConnectionError as e:
             return
 
         if not isinstance(conn, CONN_CLASS):

tests/test_signals.py

@@ -1,6 +1,4 @@
 # -*- coding: utf-8 -*-
-import sys
-sys.path[0:0] = [""]
 import unittest
 
 from mongoengine import *

tests/utils.py

@@ -0,0 +1,78 @@
+import unittest
+
+from nose.plugins.skip import SkipTest
+
+from mongoengine import connect
+from mongoengine.connection import get_db, get_connection
+from mongoengine.python_support import IS_PYMONGO_3
+
+
+MONGO_TEST_DB = 'mongoenginetest'
+
+
+class MongoDBTestCase(unittest.TestCase):
+    """Base class for tests that need a mongodb connection
+    db is being dropped automatically
+    """
+
+    @classmethod
+    def setUpClass(cls):
+        cls._connection = connect(db=MONGO_TEST_DB)
+        cls._connection.drop_database(MONGO_TEST_DB)
+        cls.db = get_db()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls._connection.drop_database(MONGO_TEST_DB)
+
+
+def get_mongodb_version():
+    """Return the version tuple of the MongoDB server that the default
+    connection is connected to.
+    """
+    return tuple(get_connection().server_info()['versionArray'])
+
+def _decorated_with_ver_requirement(func, ver_tuple):
+    """Return a given function decorated with the version requirement
+    for a particular MongoDB version tuple.
+    """
+    def _inner(*args, **kwargs):
+        mongodb_ver = get_mongodb_version()
+        if mongodb_ver >= ver_tuple:
+            return func(*args, **kwargs)
+
+        raise SkipTest('Needs MongoDB v{}+'.format(
+            '.'.join([str(v) for v in ver_tuple])
+        ))
+
+    _inner.__name__ = func.__name__
+    _inner.__doc__ = func.__doc__
+
+    return _inner
+
+def needs_mongodb_v26(func):
+    """Raise a SkipTest exception if we're working with MongoDB version
+    lower than v2.6.
+    """
+    return _decorated_with_ver_requirement(func, (2, 6))
+
+def needs_mongodb_v3(func):
+    """Raise a SkipTest exception if we're working with MongoDB version
+    lower than v3.0.
+    """
+    return _decorated_with_ver_requirement(func, (3, 0))
+
+def skip_pymongo3(f):
+    """Raise a SkipTest exception if we're running a test against
+    PyMongo v3.x.
+    """
+    def _inner(*args, **kwargs):
+        if IS_PYMONGO_3:
+            raise SkipTest("Useless with PyMongo 3+")
+        return f(*args, **kwargs)
+
+    _inner.__name__ = f.__name__
+    _inner.__doc__ = f.__doc__
+
+    return _inner
+

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = {py26,py27,py33,py34,py35,pypy,pypy3}-{mg27,mg28},flake8
+envlist = {py27,py35,pypy,pypy3}-{mg27,mg28,mg30}
 
 [testenv]
 commands =
@@ -7,16 +7,7 @@ commands =
 deps =
     nose
     mg27: PyMongo<2.8
-    mg28: PyMongo>=2.8,<3.0
+    mg28: PyMongo>=2.8,<2.9
     mg30: PyMongo>=3.0
-    mgdev: https://github.com/mongodb/mongo-python-driver/tarball/master
 setenv =
     PYTHON_EGG_CACHE = {envdir}/python-eggs
-passenv = windir
-
-[testenv:flake8]
-deps =
-    flake8
-    flake8-import-order
-commands =
-   flake8