cleanup BaseQuerySet.__getitem__

2017-03-05 20:43:38 -05:00
118 changed files with 5443 additions and 9646 deletions
--- a/.install_mongodb_on_travis.sh
+++ b/.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 [ "$MONGODB" = "3.0" ]; then
    echo "deb http://repo.mongodb.org/apt/ubuntu precise/mongodb-org/3.0 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb.list
    sudo apt-get update
    sudo apt-get install mongodb-org-server=3.0.14
    # service should be started automatically
 else
    echo "Invalid MongoDB version, expected 2.4, 2.6, or 3.0."
    exit 1
 fi;
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,73 +2,68 @@
 # PyMongo combinations. However, that would result in an overly long build
 # with a very large number of jobs, hence we only test a subset of all the
 # combinations:
-# * MongoDB v3.4 & the latest PyMongo v3.x is currently the "main" setup,
+# * MongoDB v2.4 & v3.0 are only tested against Python v2.7 & v3.5.
-#   tested against Python v2.7, v3.5, v3.6, and PyPy.
+# * MongoDB v2.4 is tested against PyMongo v2.7 & v3.x.
-# * Besides that, we test the lowest actively supported Python/MongoDB/PyMongo
+# * MongoDB v3.0 is tested against PyMongo v3.x.
-#   combination: MongoDB v3.4, PyMongo v3.4, Python v2.7.
+# * MongoDB v2.6 is currently the "main" version tested against Python v2.7,
-# * MongoDB v3.6 is tested against Python v3.6, and PyMongo v3.6, v3.7, v3.8.
+#   v3.5, PyPy & PyPy3, and PyMongo v2.7, v2.8 & v3.x.
 #
 # We should periodically check MongoDB Server versions supported by MongoDB
 # Inc., add newly released versions to the test matrix, and remove versions
 # which have reached their End of Life. See:
 # 1. https://www.mongodb.com/support-policy.
 # 2. https://docs.mongodb.com/ecosystem/drivers/driver-compatibility-reference/#python-driver-compatibility
 #
 # Reminder: Update README.rst if you change MongoDB versions we test.
 language: python
 python:
 - 2.7
 - 3.5
 - 3.6
 - pypy
-
+- pypy3
 dist: xenial
 env:
-  global:
+- MONGODB=2.6 PYMONGO=2.7
-    - MONGODB_3_4=3.4.17
+- MONGODB=2.6 PYMONGO=2.8
-    - MONGODB_3_6=3.6.12
+- MONGODB=2.6 PYMONGO=3.0
  matrix:
    - MONGODB=${MONGODB_3_4} PYMONGO=3.x
 matrix:
  # Finish the build as soon as one job fails
  fast_finish: true
  include:
  - python: 2.7
-    env: MONGODB=${MONGODB_3_4} PYMONGO=3.4.x
+    env: MONGODB=2.4 PYMONGO=2.7
-  - python: 3.6
+  - python: 2.7
-    env: MONGODB=${MONGODB_3_6} PYMONGO=3.x
+    env: MONGODB=2.4 PYMONGO=3.0
-  - python: 3.7
+  - python: 2.7
-    env: MONGODB=${MONGODB_3_6} PYMONGO=3.x
+    env: MONGODB=3.0 PYMONGO=3.0
  - python: 3.5
    env: MONGODB=2.4 PYMONGO=2.7
  - python: 3.5
    env: MONGODB=2.4 PYMONGO=3.0
  - python: 3.5
    env: MONGODB=3.0 PYMONGO=3.0
 before_install:
 - bash .install_mongodb_on_travis.sh
 install:
-  # Install Mongo
+- sudo apt-get install python-dev python3-dev libopenjpeg-dev zlib1g-dev libjpeg-turbo8-dev
-  - wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-${MONGODB}.tgz
+  libtiff4-dev libjpeg8-dev libfreetype6-dev liblcms2-dev libwebp-dev tcl8.5-dev tk8.5-dev
-  - tar xzf mongodb-linux-x86_64-${MONGODB}.tgz
+  python-tk
-  - ${PWD}/mongodb-linux-x86_64-${MONGODB}/bin/mongod --version
+- travis_retry pip install --upgrade pip
-  # Install python dependencies
+- travis_retry pip install coveralls
-  - pip install --upgrade pip
+- travis_retry pip install flake8 flake8-import-order
-  - pip install coveralls
+- travis_retry pip install tox>=1.9
-  - pip install flake8 flake8-import-order
+- travis_retry pip install "virtualenv<14.0.0"  # virtualenv>=14.0.0 has dropped Python 3.2 support (and pypy3 is based on py32)
-  - pip install tox         # tox 3.11.0 has requirement virtualenv>=14.0.0
+- travis_retry tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- -e test
  - pip install virtualenv  # virtualenv>=14.0.0 has dropped Python 3.2 support (and pypy3 is based on py32)
  # Install the tox venv
  - 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:
-  - mkdir ${PWD}/mongodb-linux-x86_64-${MONGODB}/data
+- if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then flake8 .; else echo "flake8 only runs on py27"; fi
  - ${PWD}/mongodb-linux-x86_64-${MONGODB}/bin/mongod --dbpath ${PWD}/mongodb-linux-x86_64-${MONGODB}/data --logpath ${PWD}/mongodb-linux-x86_64-${MONGODB}/mongodb.log --fork
  - if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then flake8 .; else echo "flake8 only runs on py27"; fi   # Run flake8 for py27
  - mongo --eval 'db.version();'    # Make sure mongo is awake
 script:
-  - tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- --with-coverage
+- tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- --with-coverage
 # For now only submit coveralls for Python v2.7. Python v3.x currently shows
 # 0% coverage. That's caused by 'use_2to3', which builds the py3-compatible
@@ -92,15 +87,15 @@ deploy:
  password:
    secure: QMyatmWBnC6ZN3XLW2+fTBDU4LQcp1m/LjR2/0uamyeUzWKdlOoh/Wx5elOgLwt/8N9ppdPeG83ose1jOz69l5G0MUMjv8n/RIcMFSpCT59tGYqn3kh55b0cIZXFT9ar+5cxlif6a5rS72IHm5li7QQyxexJIII6Uxp0kpvUmek=
-  # Create a source distribution and a pure python wheel for faster installs.
+  # create a source distribution and a pure python wheel for faster installs
  distributions: "sdist bdist_wheel"
-  # Only deploy on tagged commits (aka GitHub releases) and only for the parent
+  # only deploy on tagged commits (aka GitHub releases) and only for the
-  # repo's builds running Python v2.7 along with PyMongo v3.x and MongoDB v3.4.
+  # parent repo's builds running Python 2.7 along with dev PyMongo (we run
-  # We run Travis against many different Python, PyMongo, and MongoDB versions
+  # Travis against many different Python and PyMongo versions and we don't
-  # and we don't want the deploy to occur multiple times).
+  # want the deploy to occur multiple times).
  on:
    tags: true
    repo: MongoEngine/mongoengine
-    condition: ($PYMONGO = 3.x) && ($MONGODB = 3.4.17)
+    condition: "$PYMONGO = 3.0"
    python: 2.7
--- a/9
+++ b/9
@@ -243,12 +243,3 @@ that much better:
 * Victor Varvaryuk
 * Stanislav Kaledin (https://github.com/sallyruthstruik)
 * Dmitry Yantsen (https://github.com/mrTable)
 * Renjianxin (https://github.com/Davidrjx)
 * Erdenezul Batmunkh (https://github.com/erdenezul)
 * Andy Yankovsky (https://github.com/werat)
 * Bastien Gérard (https://github.com/bagerard)
 * Trevor Hall (https://github.com/tjhall13)
 * Gleb Voropaev (https://github.com/buggyspace)
 * Paulo Amaral (https://github.com/pauloAmaral)
 * Gaurav Dadhania (https://github.com/GVRV)
 * Yurii Andrieiev (https://github.com/yandrieiev)
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -22,11 +22,8 @@ Supported Interpreters
 MongoEngine supports CPython 2.7 and newer. Language
 features not supported by all interpreters can not be used.
-The codebase is written in python 2 so you must be using python 2
+Please also ensure that your code is properly converted by
-when developing new features. Compatibility of the library with Python 3
+`2to3 <http://docs.python.org/library/2to3.html>`_ for Python 3 support.
 relies on the 2to3 package that gets executed as part of the installation
 build. You should ensure that your code is properly converted by
 `2to3 <http://docs.python.org/library/2to3.html>`_.
 Style Guide
 -----------
@@ -80,6 +77,4 @@ You might also use the github `Edit <https://github.com/blog/844-forking-with-th
 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,
+the ``sphinx`` package.
 go to the ``docs`` directory, run ``make html`` and inspect the updated docs
 by running ``open _build/html/index.html``.
--- a/README.rst
+++ b/README.rst
@@ -26,28 +26,26 @@ an `API reference <https://mongoengine-odm.readthedocs.io/apireference.html>`_.
 Supported MongoDB Versions
 ==========================
-MongoEngine is currently tested against MongoDB v3.4 and v3.6. Future versions
+MongoEngine is currently tested against MongoDB v2.4, v2.6, and v3.0. Future
-should be supported as well, but aren't actively tested at the moment. Make
+versions should be supported as well, but aren't actively tested at the moment.
-sure to open an issue or submit a pull request if you experience any problems
+Make sure to open an issue or submit a pull request if you experience any
-with MongoDB version > 3.6.
+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 can use ``easy_install -U mongoengine``. Another option is
+and thus you can use ``easy_install -U mongoengine``. Otherwise, you can download the
-`pipenv <https://docs.pipenv.org/>`_. You can then use ``pipenv install mongoengine``
+source from `GitHub <http://github.com/MongoEngine/mongoengine>`_ and run ``python
-to both create the virtual environment and install the package. Otherwise, you can
+setup.py install``.
 download the source from `GitHub <http://github.com/MongoEngine/mongoengine>`_ and
 run ``python setup.py install``.
 Dependencies
 ============
 All of the dependencies can easily be installed via `pip <https://pip.pypa.io/>`_.
 At the very least, you'll need these two packages to use MongoEngine:
- pymongo>=3.4
+- pymongo>=2.7.1
 - six>=1.10.0
 If you utilize a ``DateTimeField``, you might also use a more flexible date parser:
--- a/benchmark.py
+++ b/benchmark.py
@@ -0,0 +1,207 @@
 #!/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 main():
    print("Benchmarking...")
    setup = """
 from pymongo import MongoClient
 connection = MongoClient()
 connection.drop_database('timeit_test')
 """
    stmt = """
 from pymongo import MongoClient
 connection = MongoClient()
 db = connection.timeit_test
 noddy = db.noddy
 for i in range(10000):
    example = {'fields': {}}
    for j in range(20):
        example['fields']['key' + str(j)] = 'value ' + str(j)
    noddy.save(example)
 myNoddys = noddy.find()
 [n for n in myNoddys] # iterate
 """
    print("-" * 100)
    print("""Creating 10000 dictionaries - Pymongo""")
    t = timeit.Timer(stmt=stmt, setup=setup)
    print(t.timeit(1))
    stmt = """
 from pymongo import MongoClient
 from pymongo.write_concern import WriteConcern
 connection = MongoClient()
 db = connection.get_database('timeit_test', write_concern=WriteConcern(w=0))
 noddy = db.noddy
 for i in range(10000):
    example = {'fields': {}}
    for j in range(20):
        example['fields']["key"+str(j)] = "value "+str(j)
    noddy.save(example)
 myNoddys = noddy.find()
 [n for n in myNoddys] # iterate
 """
    print("-" * 100)
    print("""Creating 10000 dictionaries - Pymongo write_concern={"w": 0}""")
    t = timeit.Timer(stmt=stmt, setup=setup)
    print(t.timeit(1))
    setup = """
 from pymongo import MongoClient
 connection = MongoClient()
 connection.drop_database('timeit_test')
 connection.close()
 from mongoengine import Document, DictField, connect
 connect('timeit_test')
 class Noddy(Document):
    fields = DictField()
 """
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    for j in range(20):
        noddy.fields["key"+str(j)] = "value "+str(j)
    noddy.save()
 myNoddys = Noddy.objects()
 [n for n in myNoddys] # iterate
 """
    print("-" * 100)
    print("""Creating 10000 dictionaries - MongoEngine""")
    t = timeit.Timer(stmt=stmt, setup=setup)
    print(t.timeit(1))
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    fields = {}
    for j in range(20):
        fields["key"+str(j)] = "value "+str(j)
    noddy.fields = fields
    noddy.save()
 myNoddys = Noddy.objects()
 [n for n in myNoddys] # iterate
 """
    print("-" * 100)
    print("""Creating 10000 dictionaries without continual assign - MongoEngine""")
    t = timeit.Timer(stmt=stmt, setup=setup)
    print(t.timeit(1))
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    for j in range(20):
        noddy.fields["key"+str(j)] = "value "+str(j)
    noddy.save(write_concern={"w": 0}, cascade=True)
 myNoddys = Noddy.objects()
 [n for n in myNoddys] # iterate
 """
    print("-" * 100)
    print("""Creating 10000 dictionaries - MongoEngine - write_concern={"w": 0}, cascade = True""")
    t = timeit.Timer(stmt=stmt, setup=setup)
    print(t.timeit(1))
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    for j in range(20):
        noddy.fields["key"+str(j)] = "value "+str(j)
    noddy.save(write_concern={"w": 0}, validate=False, cascade=True)
 myNoddys = Noddy.objects()
 [n for n in myNoddys] # iterate
 """
    print("-" * 100)
    print("""Creating 10000 dictionaries - MongoEngine, write_concern={"w": 0}, validate=False, cascade=True""")
    t = timeit.Timer(stmt=stmt, setup=setup)
    print(t.timeit(1))
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    for j in range(20):
        noddy.fields["key"+str(j)] = "value "+str(j)
    noddy.save(validate=False, write_concern={"w": 0})
 myNoddys = Noddy.objects()
 [n for n in myNoddys] # iterate
 """
    print("-" * 100)
    print("""Creating 10000 dictionaries - MongoEngine, write_concern={"w": 0}, validate=False""")
    t = timeit.Timer(stmt=stmt, setup=setup)
    print(t.timeit(1))
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    for j in range(20):
        noddy.fields["key"+str(j)] = "value "+str(j)
    noddy.save(force_insert=True, write_concern={"w": 0}, validate=False)
 myNoddys = Noddy.objects()
 [n for n in myNoddys] # iterate
 """
    print("-" * 100)
    print("""Creating 10000 dictionaries - MongoEngine, force_insert=True, write_concern={"w": 0}, validate=False""")
    t = timeit.Timer(stmt=stmt, setup=setup)
    print(t.timeit(1))
 if __name__ == "__main__":
    main()
--- a/benchmarks/test_basic_doc_ops.py
+++ b/benchmarks/test_basic_doc_ops.py
@@ -1,148 +0,0 @@
 from timeit import repeat
 import mongoengine
 from mongoengine import (BooleanField, Document, EmailField, EmbeddedDocument,
                         EmbeddedDocumentField, IntField, ListField,
                         StringField)
 mongoengine.connect(db='mongoengine_benchmark_test')
 def timeit(f, n=10000):
    return min(repeat(f, repeat=3, number=n)) / float(n)
 def test_basic():
    class Book(Document):
        name = StringField()
        pages = IntField()
        tags = ListField(StringField())
        is_published = BooleanField()
        author_email = EmailField()
    Book.drop_collection()
    def init_book():
        return Book(
            name='Always be closing',
            pages=100,
            tags=['self-help', 'sales'],
            is_published=True,
            author_email='alec@example.com',
        )
    print('Doc initialization: %.3fus' % (timeit(init_book, 1000) * 10**6))
    b = init_book()
    print('Doc getattr: %.3fus' % (timeit(lambda: b.name, 10000) * 10**6))
    print(
        'Doc setattr: %.3fus' % (
            timeit(lambda: setattr(b, 'name', 'New name'), 10000) * 10**6
        )
    )
    print('Doc to mongo: %.3fus' % (timeit(b.to_mongo, 1000) * 10**6))
    print('Doc validation: %.3fus' % (timeit(b.validate, 1000) * 10**6))
    def save_book():
        b._mark_as_changed('name')
        b._mark_as_changed('tags')
        b.save()
    print('Save to database: %.3fus' % (timeit(save_book, 100) * 10**6))
    son = b.to_mongo()
    print(
        'Load from SON: %.3fus' % (
            timeit(lambda: Book._from_son(son), 1000) * 10**6
        )
    )
    print(
        'Load from database: %.3fus' % (
            timeit(lambda: Book.objects[0], 100) * 10**6
        )
    )
    def create_and_delete_book():
        b = init_book()
        b.save()
        b.delete()
    print(
        'Init + save to database + delete: %.3fms' % (
            timeit(create_and_delete_book, 10) * 10**3
        )
    )
 def test_big_doc():
    class Contact(EmbeddedDocument):
        name = StringField()
        title = StringField()
        address = StringField()
    class Company(Document):
        name = StringField()
        contacts = ListField(EmbeddedDocumentField(Contact))
    Company.drop_collection()
    def init_company():
        return Company(
            name='MongoDB, Inc.',
            contacts=[
                Contact(
                    name='Contact %d' % x,
                    title='CEO',
                    address='Address %d' % x,
                )
                for x in range(1000)
            ]
        )
    company = init_company()
    print('Big doc to mongo: %.3fms' % (timeit(company.to_mongo, 100) * 10**3))
    print('Big doc validation: %.3fms' % (timeit(company.validate, 1000) * 10**3))
    company.save()
    def save_company():
        company._mark_as_changed('name')
        company._mark_as_changed('contacts')
        company.save()
    print('Save to database: %.3fms' % (timeit(save_company, 100) * 10**3))
    son = company.to_mongo()
    print(
        'Load from SON: %.3fms' % (
            timeit(lambda: Company._from_son(son), 100) * 10**3
        )
    )
    print(
        'Load from database: %.3fms' % (
            timeit(lambda: Company.objects[0], 100) * 10**3
        )
    )
    def create_and_delete_company():
        c = init_company()
        c.save()
        c.delete()
    print(
        'Init + save to database + delete: %.3fms' % (
            timeit(create_and_delete_company, 10) * 10**3
        )
    )
 if __name__ == '__main__':
    test_basic()
    print('-' * 100)
    test_big_doc()
--- a/benchmarks/test_inserts.py
+++ b/benchmarks/test_inserts.py
@@ -1,154 +0,0 @@
 import timeit
 def main():
    setup = """
 from pymongo import MongoClient
 connection = MongoClient()
 connection.drop_database('mongoengine_benchmark_test')
 """
    stmt = """
 from pymongo import MongoClient
 connection = MongoClient()
 db = connection.mongoengine_benchmark_test
 noddy = db.noddy
 for i in range(10000):
    example = {'fields': {}}
    for j in range(20):
        example['fields']["key"+str(j)] = "value "+str(j)
    noddy.insert_one(example)
 myNoddys = noddy.find()
 [n for n in myNoddys]  # iterate
 """
    print('-' * 100)
    print('PyMongo: Creating 10000 dictionaries.')
    t = timeit.Timer(stmt=stmt, setup=setup)
    print('{}s'.format(t.timeit(1)))
    stmt = """
 from pymongo import MongoClient, WriteConcern
 connection = MongoClient()
 db = connection.mongoengine_benchmark_test
 noddy = db.noddy.with_options(write_concern=WriteConcern(w=0))
 for i in range(10000):
    example = {'fields': {}}
    for j in range(20):
        example['fields']["key"+str(j)] = "value "+str(j)
    noddy.insert_one(example)
 myNoddys = noddy.find()
 [n for n in myNoddys]  # iterate
 """
    print('-' * 100)
    print('PyMongo: Creating 10000 dictionaries (write_concern={"w": 0}).')
    t = timeit.Timer(stmt=stmt, setup=setup)
    print('{}s'.format(t.timeit(1)))
    setup = """
 from pymongo import MongoClient
 connection = MongoClient()
 connection.drop_database('mongoengine_benchmark_test')
 connection.close()
 from mongoengine import Document, DictField, connect
 connect("mongoengine_benchmark_test")
 class Noddy(Document):
    fields = DictField()
 """
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    for j in range(20):
        noddy.fields["key"+str(j)] = "value "+str(j)
    noddy.save()
 myNoddys = Noddy.objects()
 [n for n in myNoddys]  # iterate
 """
    print('-' * 100)
    print('MongoEngine: Creating 10000 dictionaries.')
    t = timeit.Timer(stmt=stmt, setup=setup)
    print('{}s'.format(t.timeit(1)))
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    fields = {}
    for j in range(20):
        fields["key"+str(j)] = "value "+str(j)
    noddy.fields = fields
    noddy.save()
 myNoddys = Noddy.objects()
 [n for n in myNoddys]  # iterate
 """
    print('-' * 100)
    print('MongoEngine: Creating 10000 dictionaries (using a single field assignment).')
    t = timeit.Timer(stmt=stmt, setup=setup)
    print('{}s'.format(t.timeit(1)))
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    for j in range(20):
        noddy.fields["key"+str(j)] = "value "+str(j)
    noddy.save(write_concern={"w": 0})
 myNoddys = Noddy.objects()
 [n for n in myNoddys] # iterate
 """
    print('-' * 100)
    print('MongoEngine: Creating 10000 dictionaries (write_concern={"w": 0}).')
    t = timeit.Timer(stmt=stmt, setup=setup)
    print('{}s'.format(t.timeit(1)))
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    for j in range(20):
        noddy.fields["key"+str(j)] = "value "+str(j)
    noddy.save(write_concern={"w": 0}, validate=False)
 myNoddys = Noddy.objects()
 [n for n in myNoddys] # iterate
 """
    print('-' * 100)
    print('MongoEngine: Creating 10000 dictionaries (write_concern={"w": 0}, validate=False).')
    t = timeit.Timer(stmt=stmt, setup=setup)
    print('{}s'.format(t.timeit(1)))
    stmt = """
 for i in range(10000):
    noddy = Noddy()
    for j in range(20):
        noddy.fields["key"+str(j)] = "value "+str(j)
    noddy.save(force_insert=True, write_concern={"w": 0}, validate=False)
 myNoddys = Noddy.objects()
 [n for n in myNoddys] # iterate
 """
    print('-' * 100)
    print('MongoEngine: Creating 10000 dictionaries (force_insert=True, write_concern={"w": 0}, validate=False).')
    t = timeit.Timer(stmt=stmt, setup=setup)
    print('{}s'.format(t.timeit(1)))
 if __name__ == "__main__":
    main()
--- a/docs/_themes/sphinx_rtd_theme/init.py
+++ b/docs/_themes/sphinx_rtd_theme/init.py
@@ -0,0 +1,17 @@
 """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
--- a/docs/_themes/sphinx_rtd_theme/breadcrumbs.html
+++ b/docs/_themes/sphinx_rtd_theme/breadcrumbs.html
@@ -0,0 +1,15 @@
 <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/>
--- a/docs/_themes/sphinx_rtd_theme/footer.html
+++ b/docs/_themes/sphinx_rtd_theme/footer.html
@@ -0,0 +1,30 @@
 <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>
--- a/docs/_themes/sphinx_rtd_theme/layout.html
+++ b/docs/_themes/sphinx_rtd_theme/layout.html
@@ -0,0 +1,142 @@
 {# TEMPLATE VAR SETTINGS #}
 {%- set url_root = pathto('', 1) %}
 {%- if url_root == '#' %}{% set url_root = '' %}{% endif %}
 {%- if not embedded and docstitle %}
  {%- set titlesuffix = " &mdash; "|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>
--- a/docs/_themes/sphinx_rtd_theme/layout_old.html
+++ b/docs/_themes/sphinx_rtd_theme/layout_old.html
@@ -0,0 +1,205 @@
 {#
    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>
--- a/docs/_themes/sphinx_rtd_theme/search.html
+++ b/docs/_themes/sphinx_rtd_theme/search.html
@@ -0,0 +1,50 @@
 {#
    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 %}
--- a/docs/_themes/sphinx_rtd_theme/searchbox.html
+++ b/docs/_themes/sphinx_rtd_theme/searchbox.html
@@ -0,0 +1,5 @@
 <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>
--- a/docs/_themes/sphinx_rtd_theme/static/css/badge_only.css
+++ b/docs/_themes/sphinx_rtd_theme/static/css/badge_only.css
@@ -0,0 +1 @@
 .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}}
--- a/docs/_themes/sphinx_rtd_theme/static/css/theme.css
+++ b/docs/_themes/sphinx_rtd_theme/static/css/theme.css
--- a/docs/_themes/sphinx_rtd_theme/static/favicon.ico
+++ b/docs/_themes/sphinx_rtd_theme/static/favicon.ico
--- a/docs/_themes/sphinx_rtd_theme/static/font/fontawesome_webfont.eot
+++ b/docs/_themes/sphinx_rtd_theme/static/font/fontawesome_webfont.eot
--- a/docs/_themes/sphinx_rtd_theme/static/font/fontawesome_webfont.svg
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 $( 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>");
 });
--- a/docs/_themes/sphinx_rtd_theme/theme.conf
+++ b/docs/_themes/sphinx_rtd_theme/theme.conf
@@ -0,0 +1,8 @@
 [theme]
 inherit = basic
 stylesheet = css/theme.css
 [options]
 typekit_id = hiw1hhg
 analytics_id =
 canonical_url =
--- a/docs/_themes/sphinx_rtd_theme/versions.html
+++ b/docs/_themes/sphinx_rtd_theme/versions.html
@@ -0,0 +1,37 @@
 {% 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 %}
--- a/docs/apireference.rst
+++ b/docs/apireference.rst
@@ -13,7 +13,6 @@ Documents
 .. autoclass:: mongoengine.Document
   :members:
   :inherited-members:
   .. attribute:: objects
@@ -22,15 +21,12 @@ Documents
 .. autoclass:: mongoengine.EmbeddedDocument
   :members:
   :inherited-members:
 .. autoclass:: mongoengine.DynamicDocument
   :members:
   :inherited-members:
 .. autoclass:: mongoengine.DynamicEmbeddedDocument
   :members:
   :inherited-members:
 .. autoclass:: mongoengine.document.MapReduceDocument
  :members:
@@ -91,9 +87,7 @@ Fields
 .. autoclass:: mongoengine.fields.DictField
 .. autoclass:: mongoengine.fields.MapField
 .. autoclass:: mongoengine.fields.ReferenceField
 .. autoclass:: mongoengine.fields.LazyReferenceField
 .. autoclass:: mongoengine.fields.GenericReferenceField
 .. autoclass:: mongoengine.fields.GenericLazyReferenceField
 .. autoclass:: mongoengine.fields.CachedReferenceField
 .. autoclass:: mongoengine.fields.BinaryField
 .. autoclass:: mongoengine.fields.FileField
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,4 +1,3 @@
 =========
 Changelog
 =========
@@ -6,159 +5,11 @@ Changelog
 Development
 ===========
 - (Fill this out as you fix issues and develop your features).
-
+- Fixed using sets in field choices #1481
 Changes in 0.18.2
 =================
 - Replace some of the deprecated PyMongo v2.x methods with their v3.x equivalents #2097
 - Various code clarity and documentation improvements
 Changes in 0.18.1
 =================
 - Fix a bug introduced in 0.18.0 which was causing `.save()` to update all the fields
    instead of updating only the modified fields. This bug only occurs when using custom pk #2082
 - Add Python 3.7 in travis #2058
 Changes in 0.18.0
 =================
 - Drop support for EOL'd MongoDB v2.6, v3.0, and v3.2.
 - MongoEngine now requires PyMongo >= v3.4. Travis CI now tests against MongoDB v3.4 – v3.6 and PyMongo v3.4 – v3.6 (#2017 #2066).
 - Improve performance by avoiding a call to `to_mongo` in `Document.save()` #2049
 - Connection/disconnection improvements:
    - Expose `mongoengine.connection.disconnect` and `mongoengine.connection.disconnect_all`
    - Fix disconnecting #566 #1599 #605 #607 #1213 #565
    - Improve documentation of `connect`/`disconnect`
    - Fix issue when using multiple connections to the same mongo with different credentials #2047
    - `connect` fails immediately when db name contains invalid characters #2031 #1718
 - Fix the default write concern of `Document.save` that was overwriting the connection write concern #568
 - Fix querying on `List(EmbeddedDocument)` subclasses fields #1961 #1492
 - Fix querying on `(Generic)EmbeddedDocument` subclasses fields #475
 - Fix `QuerySet.aggregate` so that it takes limit and skip value into account #2029
 - Generate unique indices for `SortedListField` and `EmbeddedDocumentListFields` #2020
 - BREAKING CHANGE: Changed the behavior of a custom field validator (i.e `validation` parameter of a `Field`). It is now expected to raise a `ValidationError` instead of returning True/False #2050
 - BREAKING CHANGES (associated with connect/disconnect fixes):
    - Calling `connect` 2 times with the same alias and different parameter will raise an error (should call `disconnect` first).
    - `disconnect` now clears `mongoengine.connection._connection_settings`.
    - `disconnect` now clears the cached attribute `Document._collection`.
 - BREAKING CHANGE: `EmbeddedDocument.save` & `.reload` is no longier exist #1552
 Changes in 0.17.0
 =================
 - Fix .only() working improperly after using .count() of the same instance of QuerySet
 - Fix batch_size that was not copied when cloning a queryset object #2011
 - POTENTIAL BREAKING CHANGE: All result fields are now passed, including internal fields (_cls, _id) when using `QuerySet.as_pymongo` #1976
 - Document a BREAKING CHANGE introduced in 0.15.3 and not reported at that time (#1995)
 - Fix InvalidStringData error when using modify on a BinaryField #1127
 - DEPRECATION: `EmbeddedDocument.save` & `.reload` are marked as deprecated and will be removed in a next version of mongoengine #1552
 - Fix test suite and CI to support MongoDB 3.4 #1445
 - Fix reference fields querying the database on each access if value contains orphan DBRefs
 =================
 Changes in 0.16.3
 =================
 - Fix $push with $position operator not working with lists in embedded document #1965
 =================
 Changes in 0.16.2
 =================
 - Fix .save() that fails when called with write_concern=None (regression of 0.16.1) #1958
 =================
 Changes in 0.16.1
 =================
 - Fix `_cls` that is not set properly in Document constructor (regression) #1950
 - Fix bug in _delta method - Update of a ListField depends on an unrelated dynamic field update #1733
 - Remove deprecated `save()` method and used `insert_one()` #1899
 =================
 Changes in 0.16.0
 =================
 - Various improvements to the doc
 - Improvement to code quality
 - POTENTIAL BREAKING CHANGES:
    - EmbeddedDocumentField will no longer accept references to Document classes in its constructor #1661
    - Get rid of the `basecls` parameter from the DictField constructor (dead code) #1876
    - default value of ComplexDateTime is now None (and no longer the current datetime) #1368
 - Fix unhashable TypeError when referencing a Document with a compound key in an EmbeddedDocument #1685
 - Fix bug where an EmbeddedDocument with the same id as its parent would not be tracked for changes #1768
 - Fix the fact that bulk `insert()` was not setting primary keys of inserted documents instances #1919
 - Fix bug when referencing the abstract class in a ReferenceField #1920
 - Allow modification to the document made in pre_save_post_validation to be taken into account #1202
 - Replaced MongoDB 2.4 tests in CI by MongoDB 3.2 #1903
 - Fix side effects of using queryset.`no_dereference` on other documents #1677
 - Fix TypeError when using lazy django translation objects as translated choices #1879
 - Improve 2-3 codebase compatibility #1889
 - Fix the support for changing the default value of ComplexDateTime #1368
 - Improves error message in case an EmbeddedDocumentListField receives an EmbeddedDocument instance
    instead of a list #1877
 - Fix the Decimal operator inc/dec #1517 #1320
 - Ignore killcursors queries in `query_counter` context manager #1869
 - Fix the fact that `query_counter` was modifying the initial profiling_level in case it was != 0 #1870
 - Repaired the `no_sub_classes` context manager + fix the fact that it was swallowing exceptions #1865
 - Fix index creation error that was swallowed by hasattr under python2 #1688
 - QuerySet limit function behaviour: Passing 0 as parameter will return all the documents in the cursor #1611
 - bulk insert updates the ids of the input documents instances #1919
 - Fix an harmless bug related to GenericReferenceField where modifications in the generic-referenced document
    were tracked in the parent #1934
 - Improve validator of BinaryField #273
 - Implemented lazy regex compiling in Field classes to improve 'import mongoengine' performance #1806
 - Updated GridFSProxy.__str__  so that it would always print both the filename and grid_id #710
 - Add __repr__ to Q and QCombination #1843
 - fix bug in BaseList.__iter__ operator (was occuring when modifying a BaseList while iterating over it) #1676
 - Added field `DateField`#513
 Changes in 0.15.3
 =================
 -  BREAKING CHANGES: `Queryset.update/update_one` methods now returns an UpdateResult when `full_result=True` is provided and no longer a dict (relates to #1491)
 -  Subfield resolve error in generic_emdedded_document query #1651 #1652
 -  use each modifier only with $position #1673 #1675
 -  Improve LazyReferenceField and GenericLazyReferenceField with nested fields #1704
 -  Fix validation error instance in GenericEmbeddedDocumentField #1067
 -  Update cached fields when fields argument is given #1712
 -  Add a db parameter to register_connection for compatibility with connect
 -  Use insert_one, insert_many in Document.insert #1491
 -  Use new update_one, update_many on document/queryset update #1491
 -  Use insert_one, insert_many in Document.insert #1491
 -  Fix reload(fields) affect changed fields #1371
 -  Fix Read-only access to database fails when trying to create indexes #1338
 Changes in 0.15.0
 =================
 - Add LazyReferenceField and GenericLazyReferenceField to address #1230
 Changes in 0.14.1
 =================
 - Removed SemiStrictDict and started using a regular dict for `BaseDocument._data` #1630
 - Added support for the `$position` param in the `$push` operator #1566
 - Fixed `DateTimeField` interpreting an empty string as today #1533
 - Added a missing `__ne__` method to the `GridFSProxy` class #1632
 - Fixed `BaseQuerySet._fields_to_db_fields` #1553
 Changes in 0.14.0
 =================
 - BREAKING CHANGE: Removed the `coerce_types` param from `QuerySet.as_pymongo` #1549
 - POTENTIAL BREAKING CHANGE: Made EmbeddedDocument not hashable by default #1528
 - Improved code quality #1531, #1540, #1541, #1547
 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
 =================
--- a/docs/code/tumblelog.py
+++ b/docs/code/tumblelog.py
@@ -45,27 +45,27 @@ post2.link_url = 'http://tractiondigital.com/labs/mongoengine/docs'
 post2.tags = ['mongoengine']
 post2.save()
-print('ALL POSTS')
+print 'ALL POSTS'
-print()
+print
 for post in Post.objects:
-    print(post.title)
+    print post.title
    #print '=' * post.title.count()
-    print("=" * 20)
+    print "=" * 20
    if isinstance(post, TextPost):
-        print(post.content)
+        print post.content
    if isinstance(post, LinkPost):
-        print('Link:', post.link_url)
+        print 'Link:', post.link_url
-    print()
+    print
-print()
+print
-print('POSTS TAGGED \'MONGODB\'')
+print 'POSTS TAGGED \'MONGODB\''
-print()
+print
 for post in Post.objects(tags='mongodb'):
-    print(post.title)
+    print post.title
-print()
+print
 num_posts = Post.objects(tags='mongodb').count()
-print('Found %d posts with tag "mongodb"' % num_posts)
+print 'Found %d posts with tag "mongodb"' % num_posts
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -13,10 +13,6 @@
 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.
@@ -48,6 +44,7 @@ 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.
@@ -100,12 +97,10 @@ 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 = [sphinx_rtd_theme.get_html_theme_path()]
+html_theme_path = ['_themes']
 # The name for this set of Sphinx documents.  If None, it defaults to
 # "<project> v<release> documentation".
@@ -204,3 +199,7 @@ latex_documents = [
 #latex_use_modindex = True
 autoclass_content = 'both'
 html_theme_options = dict(
    canonical_url='http://docs.mongoengine.org/en/latest/'
 )
--- a/docs/guide/connecting.rst
+++ b/docs/guide/connecting.rst
@@ -4,11 +4,9 @@
 Connecting to MongoDB
 =====================
-Connections in MongoEngine are registered globally and are identified with aliases.
+To connect to a running instance of :program:`mongod`, use the
-If no `alias` is provided during the connection, it will use "default" as alias.
+:func:`~mongoengine.connect` function. The first argument is the name of the
-
+database to connect to::
 To connect to a running instance of :program:`mongod`, use the :func:`~mongoengine.connect`
 function. The first argument is the name of the database to connect to::
    from mongoengine import connect
    connect('project1')
@@ -20,10 +18,10 @@ provide the :attr:`host` and :attr:`port` arguments to
    connect('project1', host='192.168.1.35', port=12345)
-If the database requires authentication, :attr:`username`, :attr:`password`
+If the database requires authentication, :attr:`username` and :attr:`password`
-and :attr:`authentication_source` arguments should be provided::
+arguments should be provided::
-    connect('project1', username='webapp', password='pwd123', authentication_source='admin')
+    connect('project1', username='webapp', password='pwd123')
 URI style connections are also supported -- just supply the URI as
 the :attr:`host` to
@@ -44,9 +42,6 @@ the :attr:`host` to
    will establish connection to ``production`` database using
    ``admin`` username and ``qwerty`` password.
 .. note:: Calling :func:`~mongoengine.connect` without argument will establish
    a connection to the "test" database by default
 Replica Sets
 ============
@@ -76,61 +71,28 @@ 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.
-Documents defined in different database
+Individual documents can also support multiple databases by providing a
 ---------------------------------------
 Individual documents can be attached to different databases by providing a
 `db_alias` in their meta data. This allows :class:`~pymongo.dbref.DBRef`
 objects to point across databases and collections. Below is an example schema,
 using 3 different databases to store data::
        connect(alias='user-db-alias', db='user-db')
        connect(alias='book-db-alias', db='book-db')
        connect(alias='users-books-db-alias', db='users-books-db')
        class User(Document):
            name = StringField()
-            meta = {'db_alias': 'user-db-alias'}
+            meta = {'db_alias': 'user-db'}
        class Book(Document):
            name = StringField()
-            meta = {'db_alias': 'book-db-alias'}
+            meta = {'db_alias': 'book-db'}
        class AuthorBooks(Document):
            author = ReferenceField(User)
            book = ReferenceField(Book)
-            meta = {'db_alias': 'users-books-db-alias'}
+            meta = {'db_alias': 'users-books-db'}
 Disconnecting an existing connection
 ------------------------------------
 The function :func:`~mongoengine.disconnect` can be used to
 disconnect a particular connection. This can be used to change a
 connection globally::
        from mongoengine import connect, disconnect
        connect('a_db', alias='db1')
        class User(Document):
            name = StringField()
            meta = {'db_alias': 'db1'}
        disconnect(alias='db1')
        connect('another_db', alias='db1')
 .. note:: Calling :func:`~mongoengine.disconnect` without argument
    will disconnect the "default" connection
 .. note:: Since connections gets registered globally, it is important
    to use the `disconnect` function from MongoEngine and not the
    `disconnect()` method of an existing connection (pymongo.MongoClient)
 .. note:: :class:`~mongoengine.Document` are caching the pymongo collection.
    using `disconnect` ensures that it gets cleaned as well
 Context Managers
 ================
 Sometimes you may want to switch the database or collection to query against.
@@ -157,7 +119,7 @@ access to the same User document across databases::
 Switch Collection
 -----------------
-The :func:`~mongoengine.context_managers.switch_collection` context manager
+The :class:`~mongoengine.context_managers.switch_collection` context manager
 allows you to change the collection for a given class allowing quick and easy
 access to the same Group document across collection::
--- a/docs/guide/defining-documents.rst
+++ b/docs/guide/defining-documents.rst
@@ -22,7 +22,7 @@ objects** as class attributes to the document class::
    class Page(Document):
        title = StringField(max_length=200, required=True)
-        date_modified = DateTimeField(default=datetime.datetime.utcnow)
+        date_modified = DateTimeField(default=datetime.datetime.now)
 As BSON (the binary format for storing data in mongodb) is order dependent,
 documents are serialized based on their field order.
@@ -80,16 +80,13 @@ are as follows:
 * :class:`~mongoengine.fields.FloatField`
 * :class:`~mongoengine.fields.GenericEmbeddedDocumentField`
 * :class:`~mongoengine.fields.GenericReferenceField`
 * :class:`~mongoengine.fields.GenericLazyReferenceField`
 * :class:`~mongoengine.fields.GeoPointField`
 * :class:`~mongoengine.fields.ImageField`
 * :class:`~mongoengine.fields.IntField`
 * :class:`~mongoengine.fields.ListField`
 * :class:`~mongoengine.fields.LongField`
 * :class:`~mongoengine.fields.MapField`
 * :class:`~mongoengine.fields.ObjectIdField`
 * :class:`~mongoengine.fields.ReferenceField`
 * :class:`~mongoengine.fields.LazyReferenceField`
 * :class:`~mongoengine.fields.SequenceField`
 * :class:`~mongoengine.fields.SortedListField`
 * :class:`~mongoengine.fields.StringField`
@@ -156,7 +153,7 @@ arguments can be set on all fields:
    An iterable (e.g. list, tuple or set) of choices to which the value of this
    field should be limited.
-    Can either be nested tuples of value (stored in mongo) and a
+    Can be either be a nested tuples of value (stored in mongo) and a
    human readable key ::
        SIZE = (('S', 'Small'),
@@ -176,21 +173,6 @@ arguments can be set on all fields:
        class Shirt(Document):
            size = StringField(max_length=3, choices=SIZE)
 :attr:`validation` (Optional)
    A callable to validate the value of the field.
    The callable takes the value as parameter and should raise a ValidationError
    if validation fails
    e.g ::
        def _not_empty(val):
            if not val:
                raise ValidationError('value can not be empty')
        class Person(Document):
            name = StringField(validation=_not_empty)
 :attr:`**kwargs` (Optional)
    You can supply additional metadata as arbitrary additional keyword
    arguments.  You can not override existing attributes, however.  Common
@@ -242,7 +224,7 @@ store; in this situation a :class:`~mongoengine.fields.DictField` is appropriate
        user = ReferenceField(User)
        answers = DictField()
-    survey_response = SurveyResponse(date=datetime.utcnow(), user=request.user)
+    survey_response = SurveyResponse(date=datetime.now(), user=request.user)
    response_form = ResponseForm(request.POST)
    survey_response.answers = response_form.cleaned_data()
    survey_response.save()
@@ -508,9 +490,7 @@ the field name with a **#**::
            ]
        }
-If a dictionary is passed then additional options become available. Valid options include,
+If a dictionary is passed then the following options are available:
 but are not limited to:
 :attr:`fields` (Default: None)
    The fields to index. Specified in the same format as described above.
@@ -531,15 +511,8 @@ but are not limited to:
    Allows you to automatically expire data from a collection by setting the
    time in seconds to expire the a field.
 :attr:`name` (Optional)
    Allows you to specify a name for the index
 :attr:`collation` (Optional)
    Allows to create case insensitive indexes (MongoDB v3.4+ only)
 .. note::
    Additional options are forwarded as **kwargs to pymongo's create_index method.
    Inheritance adds extra fields indices see: :ref:`document-inheritance`.
 Global index default options
@@ -551,16 +524,15 @@ There are a few top level defaults for all indexes that can be set::
        title = StringField()
        rating = StringField()
        meta = {
-            'index_opts': {},
+            'index_options': {},
            'index_background': True,
            'index_cls': False,
            'auto_create_index': True,
            'index_drop_dups': True,
            'index_cls': False
        }
-:attr:`index_opts` (Optional)
+:attr:`index_options` (Optional)
-    Set any default index options - see the `full options list <https://docs.mongodb.com/manual/reference/method/db.collection.createIndex/#db.collection.createIndex>`_
+    Set any default index options - see the `full options list <http://docs.mongodb.org/manual/reference/method/db.collection.ensureIndex/#db.collection.ensureIndex>`_
 :attr:`index_background` (Optional)
    Set the default value for if an index should be indexed in the background
@@ -568,15 +540,10 @@ There are a few top level defaults for all indexes that can be set::
 :attr:`index_cls` (Optional)
    A way to turn off a specific index for _cls.
 :attr:`auto_create_index` (Optional)
    When this is True (default), MongoEngine will ensure that the correct
    indexes exist in MongoDB each time a command is run. This can be disabled
    in systems where indexes are managed separately. Disabling this will improve
    performance.
 :attr:`index_drop_dups` (Optional)
    Set the default value for if an index should drop duplicates
-    Since MongoDB 3.0 drop_dups is not supported anymore. Raises a Warning
+
 .. note:: Since MongoDB 3.0 drop_dups is not supported anymore. Raises a Warning
    and has no effect
@@ -651,7 +618,7 @@ collection after a given period. See the official
 documentation for more information.  A common usecase might be session data::
    class Session(Document):
-        created = DateTimeField(default=datetime.utcnow)
+        created = DateTimeField(default=datetime.now)
        meta = {
            'indexes': [
                {'fields': ['created'], 'expireAfterSeconds': 3600}
@@ -714,16 +681,11 @@ subsequent calls to :meth:`~mongoengine.queryset.QuerySet.order_by`. ::
 Shard keys
 ==========
-If your collection is sharded by multiple keys, then you can improve shard
+If your collection is sharded, then you need to specify the shard key as a tuple,
-routing (and thus the performance of your application) by specifying the shard
+using the :attr:`shard_key` attribute of :attr:`~mongoengine.Document.meta`.
-key, using the :attr:`shard_key` attribute of
+This ensures that the shard key is sent with the query when calling the
-:attr:`~mongoengine.Document.meta`. The shard key should be defined as a tuple.
+:meth:`~mongoengine.document.Document.save` or
-
+:meth:`~mongoengine.document.Document.update` method on an existing
 This ensures that the full shard key is sent with the query when calling
 methods such as :meth:`~mongoengine.document.Document.save`,
 :meth:`~mongoengine.document.Document.update`,
 :meth:`~mongoengine.document.Document.modify`, or
 :meth:`~mongoengine.document.Document.delete` on an existing
 :class:`~mongoengine.Document` instance::
    class LogEntry(Document):
@@ -733,8 +695,7 @@ methods such as :meth:`~mongoengine.document.Document.save`,
        data = StringField()
        meta = {
-            'shard_key': ('machine', 'timestamp'),
+            'shard_key': ('machine', 'timestamp',)
            'indexes': ('machine', 'timestamp'),
        }
 .. _document-inheritance:
@@ -764,9 +725,6 @@ document.::
 .. note:: From 0.8 onwards :attr:`allow_inheritance` defaults
          to False, meaning you must set it to True to use inheritance.
          Setting :attr:`allow_inheritance` to True should also be used in
          :class:`~mongoengine.EmbeddedDocument` class in case you need to subclass it
 Working with existing data
 --------------------------
 As MongoEngine no longer defaults to needing :attr:`_cls`, you can quickly and
--- a/docs/guide/document-instances.rst
+++ b/docs/guide/document-instances.rst
@@ -57,8 +57,7 @@ document values for example::
        def clean(self):
            """Ensures that only published essays have a `pub_date` and
-            automatically sets `pub_date` if essay is published and `pub_date`
+            automatically sets the pub_date if published and not set"""
            is not set"""
            if self.status == 'Draft' and self.pub_date is not None:
                msg = 'Draft entries should not have a publication date.'
                raise ValidationError(msg)
--- a/docs/guide/gridfs.rst
+++ b/docs/guide/gridfs.rst
@@ -53,8 +53,7 @@ Deletion
 Deleting stored files is achieved with the :func:`delete` method::
-    marmot.photo.delete()    # Deletes the GridFS document
+    marmot.photo.delete()
    marmot.save()            # Saves the GridFS reference (being None) contained in the marmot instance
 .. warning::
@@ -72,5 +71,4 @@ Files can be replaced with the :func:`replace` method. This works just like
 the :func:`put` method so even metadata can (and should) be replaced::
    another_marmot = open('another_marmot.png', 'rb')
-    marmot.photo.replace(another_marmot, content_type='image/png')  # Replaces the GridFS document
+    marmot.photo.replace(another_marmot, content_type='image/png')
    marmot.save()                                                   # Replaces the GridFS reference contained in marmot instance
--- a/docs/guide/mongomock.rst
+++ b/docs/guide/mongomock.rst
@@ -19,30 +19,3 @@ or with an alias:
    connect('mongoenginetest', host='mongomock://localhost', alias='testdb')
    conn = get_connection('testdb')
 Example of test file:
 --------
 .. code-block:: python
    import unittest
    from mongoengine import connect, disconnect
    class Person(Document):
        name = StringField()
    class TestPerson(unittest.TestCase):
        @classmethod
        def setUpClass(cls):
            connect('mongoenginetest', host='mongomock://localhost')
        @classmethod
        def tearDownClass(cls):
           disconnect()
        def test_thing(self):
            pers = Person(name='John')
            pers.save()
            fresh_pers = Person.objects().first()
            self.assertEqual(fresh_pers.name, 'John')
--- a/docs/guide/querying.rst
+++ b/docs/guide/querying.rst
@@ -64,7 +64,7 @@ Available operators are as follows:
 * ``gt`` -- greater than
 * ``gte`` -- greater than or equal to
 * ``not`` -- negate a standard check, may be used before other operators (e.g.
-  ``Q(age__not__mod=(5, 0))``)
+  ``Q(age__not__mod=5)``)
 * ``in`` -- value is in list (a list of values should be provided)
 * ``nin`` -- value is not in list (a list of values should be provided)
 * ``mod`` -- ``value % x == y``, where ``x`` and ``y`` are two provided values
@@ -456,14 +456,14 @@ data. To turn off dereferencing of the results of a query use
 :func:`~mongoengine.queryset.QuerySet.no_dereference` on the queryset like so::
    post = Post.objects.no_dereference().first()
-    assert(isinstance(post.author, DBRef))
+    assert(isinstance(post.author, ObjectId))
 You can also turn off all dereferencing for a fixed period by using the
 :class:`~mongoengine.context_managers.no_dereference` context manager::
    with no_dereference(Post) as Post:
        post = Post.objects.first()
-        assert(isinstance(post.author, DBRef))
+        assert(isinstance(post.author, ObjectId))
    # Outside the context manager dereferencing occurs.
    assert(isinstance(post.author, User))
@@ -565,15 +565,6 @@ cannot use the `$` syntax in keyword arguments it has been mapped to `S`::
    >>> post.tags
    ['database', 'mongodb']
 From MongoDB version 2.6, push operator supports $position value which allows
 to push values with index.
    >>> post = BlogPost(title="Test", tags=["mongo"])
    >>> post.save()
    >>> post.update(push__tags__0=["database", "code"])
    >>> post.reload()
    >>> post.tags
    ['database', 'code', 'mongo']
 .. note::
    Currently only top level lists are handled, future versions of mongodb /
    pymongo plan to support nested positional operators.  See `The $ positional
--- a/docs/guide/signals.rst
+++ b/docs/guide/signals.rst
@@ -43,10 +43,10 @@ Available signals include:
  has taken place but before saving.
 `post_save`
-  Called within :meth:`~mongoengine.Document.save` after most actions
+  Called within :meth:`~mongoengine.Document.save` after all actions
-  (validation, insert/update, and cascades, but not clearing dirty flags) have 
+  (validation, insert/update, cascades, clearing dirty flags) have completed
-  completed successfully.  Passed the additional boolean keyword argument 
+  successfully.  Passed the additional boolean keyword argument `created` to
-  `created` to indicate if the save was an insert or an update.
+  indicate if the save was an insert or an update.
 `pre_delete`
  Called within :meth:`~mongoengine.Document.delete` prior to
@@ -113,10 +113,6 @@ handlers within your subclass::
    signals.pre_save.connect(Author.pre_save, sender=Author)
    signals.post_save.connect(Author.post_save, sender=Author)
 .. warning::
    Note that EmbeddedDocument only supports pre/post_init signals. pre/post_save, etc should be attached to Document's class only. Attaching pre_save to an EmbeddedDocument is ignored silently.
 Finally, you can also use this small decorator to quickly create a number of
 signals and attach them to your :class:`~mongoengine.Document` or
 :class:`~mongoengine.EmbeddedDocument` subclasses as class decorators::
--- a/docs/guide/text-indexes.rst
+++ b/docs/guide/text-indexes.rst
@@ -48,4 +48,4 @@ Ordering by text score
 ::
-  objects = News.objects.search_text('mongo').order_by('$text_score')
+  objects = News.objects.search('mongo').order_by('$text_score')
--- a/docs/tutorial.rst
+++ b/docs/tutorial.rst
@@ -86,7 +86,7 @@ of them stand out as particularly intuitive solutions.
 Posts
 ^^^^^
-Happily MongoDB *isn't* a relational database, so we're not going to do it that
+Happily mongoDB *isn't* a relational database, so we're not going to do it that
 way. As it turns out, we can use MongoDB's schemaless nature to provide us with
 a much nicer solution. We will store all of the posts in *one collection* and
 each post type will only store the fields it needs. If we later want to add
@@ -153,7 +153,7 @@ 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
 *embedded documents* directly on a post document. An embedded document should
-be treated no differently than a regular document; it just doesn't have its own
+be treated no differently that a regular document; it just doesn't have its own
 collection in the database. Using MongoEngine, we can define the structure of
 embedded documents, along with utility methods, in exactly the same way we do
 with regular documents::
@@ -206,10 +206,7 @@ object::
        ross.last_name = 'Lawley'
        ross.save()
-Assign another user to a variable called ``john``, just like we did above with
+Now that we've got our user in the database, let's add a couple of posts::
 ``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.'
--- a/docs/upgrade.rst
+++ b/docs/upgrade.rst
@@ -6,37 +6,6 @@ Development
 ***********
 (Fill this out whenever you introduce breaking changes to MongoEngine)
 URLField's constructor no longer takes `verify_exists`
 0.15.0
 ******
 0.14.0
 ******
 This release includes a few bug fixes and a significant code cleanup. The most
 important change is that `QuerySet.as_pymongo` no longer supports a
 `coerce_types` mode. If you used it in the past, a) please let us know of your
 use case, b) you'll need to override `as_pymongo` to get the desired outcome.
 This release also makes the EmbeddedDocument not hashable by default. If you
 use embedded documents in sets or dictionaries, you might have to override
 `__hash__` and implement a hashing logic specific to your use case. See #1528
 for the reason behind this change.
 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.
--- a/mongoengine/init.py
+++ b/mongoengine/init.py
@@ -23,13 +23,12 @@ __all__ = (list(document.__all__) + list(fields.__all__) +
           list(signals.__all__) + list(errors.__all__))
-VERSION = (0, 18, 2)
+VERSION = (0, 11, 0)
 def get_version():
-    """Return the VERSION as a string.
+    """Return the VERSION as a string, e.g. for VERSION == (0, 10, 7),
-
+    return '0.10.7'.
    For example, if `VERSION == (0, 10, 7)`, return '0.10.7'.
    """
    return '.'.join(map(str, VERSION))
--- a/mongoengine/base/init.py
+++ b/mongoengine/base/init.py
@@ -15,7 +15,7 @@ __all__ = (
    'UPDATE_OPERATORS', '_document_registry', 'get_document',
    # datastructures
-    'BaseDict', 'BaseList', 'EmbeddedDocumentList', 'LazyReference',
+    'BaseDict', 'BaseList', 'EmbeddedDocumentList',
    # document
    'BaseDocument',
--- a/mongoengine/base/common.py
+++ b/mongoengine/base/common.py
@@ -3,23 +3,22 @@ from mongoengine.errors import NotRegistered
 __all__ = ('UPDATE_OPERATORS', 'get_document', '_document_registry')
-UPDATE_OPERATORS = {'set', 'unset', 'inc', 'dec', 'mul',
+UPDATE_OPERATORS = set(['set', 'unset', 'inc', 'dec', 'pop', 'push',
-                    'pop', 'push', 'push_all', 'pull',
+                        'push_all', 'pull', 'pull_all', 'add_to_set',
-                    'pull_all', 'add_to_set', 'set_on_insert',
+                        'set_on_insert', 'min', 'max', 'rename'])
                    'min', 'max', 'rename'}
 _document_registry = {}
 def get_document(name):
-    """Get a registered Document class by name."""
+    """Get a document class by name."""
    doc = _document_registry.get(name, None)
    if not doc:
        # Possible old style name
        single_end = name.split('.')[-1]
        compound_end = '.%s' % single_end
-        possible_match = [k for k in _document_registry
+        possible_match = [k for k in _document_registry.keys()
                          if k.endswith(compound_end) or k == single_end]
        if len(possible_match) == 1:
            doc = _document_registry.get(possible_match.pop(), None)
@@ -30,12 +29,3 @@ def get_document(name):
            been imported?
        """.strip() % name)
    return doc
 def _get_documents_by_db(connection_alias, default_connection_alias):
    """Get all registered Documents class attached to a given database"""
    def get_doc_alias(doc_cls):
        return doc_cls._meta.get('db_alias', default_connection_alias)
    return [doc_cls for doc_cls in _document_registry.values()
            if get_doc_alias(doc_cls) == connection_alias]
--- a/mongoengine/base/datastructures.py
+++ b/mongoengine/base/datastructures.py
@@ -1,33 +1,12 @@
 import itertools
 import weakref
 from bson import DBRef
 import six
 from six import iteritems
 from mongoengine.common import _import_class
 from mongoengine.errors import DoesNotExist, MultipleObjectsReturned
-__all__ = ('BaseDict', 'StrictDict', 'BaseList', 'EmbeddedDocumentList', 'LazyReference')
+__all__ = ('BaseDict', 'BaseList', 'EmbeddedDocumentList')
 def mark_as_changed_wrapper(parent_method):
    """Decorator that ensures _mark_as_changed method gets called."""
    def wrapper(self, *args, **kwargs):
        # Can't use super() in the decorator.
        result = parent_method(self, *args, **kwargs)
        self._mark_as_changed()
        return result
    return wrapper
 def mark_key_as_changed_wrapper(parent_method):
    """Decorator that ensures _mark_as_changed method gets called with the key argument"""
    def wrapper(self, key, *args, **kwargs):
        # Can't use super() in the decorator.
        result = parent_method(self, key, *args, **kwargs)
        self._mark_as_changed(key)
        return result
    return wrapper
 class BaseDict(dict):
@@ -38,36 +17,46 @@ class BaseDict(dict):
    _name = None
    def __init__(self, dict_items, instance, name):
-        BaseDocument = _import_class('BaseDocument')
+        Document = _import_class('Document')
        EmbeddedDocument = _import_class('EmbeddedDocument')
-        if isinstance(instance, BaseDocument):
+        if isinstance(instance, (Document, EmbeddedDocument)):
            self._instance = weakref.proxy(instance)
        self._name = name
        super(BaseDict, self).__init__(dict_items)
-    def get(self, key, default=None):
+    def __getitem__(self, key, *args, **kwargs):
        # get does not use __getitem__ by default so we must override it as well
        try:
            return self.__getitem__(key)
        except KeyError:
            return default
    def __getitem__(self, key):
        value = super(BaseDict, self).__getitem__(key)
        EmbeddedDocument = _import_class('EmbeddedDocument')
        if isinstance(value, EmbeddedDocument) and value._instance is None:
            value._instance = self._instance
-        elif isinstance(value, dict) and not isinstance(value, BaseDict):
+        elif not isinstance(value, BaseDict) and isinstance(value, dict):
            value = BaseDict(value, None, '%s.%s' % (self._name, key))
            super(BaseDict, self).__setitem__(key, value)
            value._instance = self._instance
-        elif isinstance(value, list) and not isinstance(value, BaseList):
+        elif not isinstance(value, BaseList) and isinstance(value, list):
            value = BaseList(value, None, '%s.%s' % (self._name, key))
            super(BaseDict, self).__setitem__(key, value)
            value._instance = self._instance
        return value
    def __setitem__(self, key, value, *args, **kwargs):
        self._mark_as_changed(key)
        return super(BaseDict, self).__setitem__(key, value)
    def __delete__(self, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseDict, self).__delete__(*args, **kwargs)
    def __delitem__(self, key, *args, **kwargs):
        self._mark_as_changed(key)
        return super(BaseDict, self).__delitem__(key)
    def __delattr__(self, key, *args, **kwargs):
        self._mark_as_changed(key)
        return super(BaseDict, self).__delattr__(key)
    def __getstate__(self):
        self.instance = None
        self._dereferenced = False
@@ -77,14 +66,25 @@ class BaseDict(dict):
        self = state
        return self
-    __setitem__ = mark_key_as_changed_wrapper(dict.__setitem__)
+    def clear(self, *args, **kwargs):
-    __delattr__ = mark_key_as_changed_wrapper(dict.__delattr__)
+        self._mark_as_changed()
-    __delitem__ = mark_key_as_changed_wrapper(dict.__delitem__)
+        return super(BaseDict, self).clear()
-    pop = mark_as_changed_wrapper(dict.pop)
+
-    clear = mark_as_changed_wrapper(dict.clear)
+    def pop(self, *args, **kwargs):
-    update = mark_as_changed_wrapper(dict.update)
+        self._mark_as_changed()
-    popitem = mark_as_changed_wrapper(dict.popitem)
+        return super(BaseDict, self).pop(*args, **kwargs)
-    setdefault = mark_as_changed_wrapper(dict.setdefault)
+
    def popitem(self, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseDict, self).popitem()
    def setdefault(self, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseDict, self).setdefault(*args, **kwargs)
    def update(self, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseDict, self).update(*args, **kwargs)
    def _mark_as_changed(self, key=None):
        if hasattr(self._instance, '_mark_as_changed'):
@@ -102,39 +102,52 @@ class BaseList(list):
    _name = None
    def __init__(self, list_items, instance, name):
-        BaseDocument = _import_class('BaseDocument')
+        Document = _import_class('Document')
        EmbeddedDocument = _import_class('EmbeddedDocument')
-        if isinstance(instance, BaseDocument):
+        if isinstance(instance, (Document, EmbeddedDocument)):
            self._instance = weakref.proxy(instance)
        self._name = name
        super(BaseList, self).__init__(list_items)
-    def __getitem__(self, key):
+    def __getitem__(self, key, *args, **kwargs):
        value = super(BaseList, self).__getitem__(key)
        if isinstance(key, slice):
            # When receiving a slice operator, we don't convert the structure and bind
            # to parent's instance. This is buggy for now but would require more work to be handled properly
            return value
        EmbeddedDocument = _import_class('EmbeddedDocument')
        if isinstance(value, EmbeddedDocument) and value._instance is None:
            value._instance = self._instance
-        elif isinstance(value, dict) and not isinstance(value, BaseDict):
+        elif not isinstance(value, BaseDict) and isinstance(value, dict):
            # Replace dict by BaseDict
            value = BaseDict(value, None, '%s.%s' % (self._name, key))
            super(BaseList, self).__setitem__(key, value)
            value._instance = self._instance
-        elif isinstance(value, list) and not isinstance(value, BaseList):
+        elif not isinstance(value, BaseList) and isinstance(value, list):
            # Replace list by BaseList
            value = BaseList(value, None, '%s.%s' % (self._name, key))
            super(BaseList, self).__setitem__(key, value)
            value._instance = self._instance
        return value
    def __iter__(self):
-        for v in super(BaseList, self).__iter__():
+        for i in xrange(self.__len__()):
-            yield v
+            yield self[i]
    def __setitem__(self, key, value, *args, **kwargs):
        if isinstance(key, slice):
            self._mark_as_changed()
        else:
            self._mark_as_changed(key)
        return super(BaseList, self).__setitem__(key, value)
    def __delitem__(self, key, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseList, self).__delitem__(key)
    def __setslice__(self, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseList, self).__setslice__(*args, **kwargs)
    def __delslice__(self, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseList, self).__delslice__(*args, **kwargs)
    def __getstate__(self):
        self.instance = None
@@ -145,40 +158,41 @@ class BaseList(list):
        self = state
        return self
-    def __setitem__(self, key, value):
+    def __iadd__(self, other):
-        changed_key = key
+        self._mark_as_changed()
-        if isinstance(key, slice):
+        return super(BaseList, self).__iadd__(other)
            # In case of slice, we don't bother to identify the exact elements being updated
            # instead, we simply marks the whole list as changed
            changed_key = None
-        result = super(BaseList, self).__setitem__(key, value)
+    def __imul__(self, other):
-        self._mark_as_changed(changed_key)
+        self._mark_as_changed()
-        return result
+        return super(BaseList, self).__imul__(other)
-    append = mark_as_changed_wrapper(list.append)
+    def append(self, *args, **kwargs):
-    extend = mark_as_changed_wrapper(list.extend)
+        self._mark_as_changed()
-    insert = mark_as_changed_wrapper(list.insert)
+        return super(BaseList, self).append(*args, **kwargs)
    pop = mark_as_changed_wrapper(list.pop)
    remove = mark_as_changed_wrapper(list.remove)
    reverse = mark_as_changed_wrapper(list.reverse)
    sort = mark_as_changed_wrapper(list.sort)
    __delitem__ = mark_as_changed_wrapper(list.__delitem__)
    __iadd__ = mark_as_changed_wrapper(list.__iadd__)
    __imul__ = mark_as_changed_wrapper(list.__imul__)
-    if six.PY2:
+    def extend(self, *args, **kwargs):
-        # Under py3 __setslice__, __delslice__ and __getslice__
+        self._mark_as_changed()
-        # are replaced by __setitem__, __delitem__ and __getitem__ with a slice as parameter
+        return super(BaseList, self).extend(*args, **kwargs)
        # so we mimic this under python 2
        def __setslice__(self, i, j, sequence):
            return self.__setitem__(slice(i, j), sequence)
-        def __delslice__(self, i, j):
+    def insert(self, *args, **kwargs):
-            return self.__delitem__(slice(i, j))
+        self._mark_as_changed()
        return super(BaseList, self).insert(*args, **kwargs)
-        def __getslice__(self, i, j):
+    def pop(self, *args, **kwargs):
-            return self.__getitem__(slice(i, j))
+        self._mark_as_changed()
        return super(BaseList, self).pop(*args, **kwargs)
    def remove(self, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseList, self).remove(*args, **kwargs)
    def reverse(self, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseList, self).reverse()
    def sort(self, *args, **kwargs):
        self._mark_as_changed()
        return super(BaseList, self).sort(*args, **kwargs)
    def _mark_as_changed(self, key=None):
        if hasattr(self._instance, '_mark_as_changed'):
@@ -192,10 +206,6 @@ class BaseList(list):
 class EmbeddedDocumentList(BaseList):
    def __init__(self, list_items, instance, name):
        super(EmbeddedDocumentList, self).__init__(list_items, instance, name)
        self._instance = instance
    @classmethod
    def __match_all(cls, embedded_doc, kwargs):
        """Return True if a given embedded doc matches all the filter
@@ -214,14 +224,15 @@ class EmbeddedDocumentList(BaseList):
            return embedded_docs
        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)
        self._instance = instance
    def filter(self, **kwargs):
        """
        Filters the list by only including embedded documents with the
        given keyword arguments.
        This method only supports simple comparison (e.g: .filter(name='John Doe'))
        and does not support operators like __gte, __lte, __icontains like queryset.filter does
        :param kwargs: The keyword arguments corresponding to the fields to
         filter on. *Multiple arguments are treated as if they are ANDed
         together.*
@@ -339,8 +350,7 @@ class EmbeddedDocumentList(BaseList):
    def update(self, **update):
        """
-        Updates the embedded documents with the given replacement values. This
+        Updates the embedded documents with the given update values.
        function does not support mongoDB update operators such as ``inc__``.
        .. note::
            The embedded document changes are not automatically saved
@@ -362,11 +372,11 @@ class EmbeddedDocumentList(BaseList):
 class StrictDict(object):
    __slots__ = ()
-    _special_fields = {'get', 'pop', 'iteritems', 'items', 'keys', 'create'}
+    _special_fields = set(['get', 'pop', 'iteritems', 'items', 'keys', 'create'])
    _classes = {}
    def __init__(self, **kwargs):
-        for k, v in iteritems(kwargs):
+        for k, v in kwargs.iteritems():
            setattr(self, k, v)
    def __getitem__(self, key):
@@ -414,7 +424,7 @@ class StrictDict(object):
        return (key for key in self.__slots__ if hasattr(self, key))
    def __len__(self):
-        return len(list(iteritems(self)))
+        return len(list(self.iteritems()))
    def __eq__(self, other):
        return self.items() == other.items()
@@ -437,40 +447,40 @@ class StrictDict(object):
        return cls._classes[allowed_keys]
-class LazyReference(DBRef):
+class SemiStrictDict(StrictDict):
-    __slots__ = ('_cached_doc', 'passthrough', 'document_type')
+    __slots__ = ('_extras', )
    _classes = {}
-    def fetch(self, force=False):
+    def __getattr__(self, attr):
        if not self._cached_doc or force:
            self._cached_doc = self.document_type.objects.get(pk=self.pk)
            if not self._cached_doc:
                raise DoesNotExist('Trying to dereference unknown document %s' % (self))
        return self._cached_doc
    @property
    def pk(self):
        return self.id
    def __init__(self, document_type, pk, cached_doc=None, passthrough=False):
        self.document_type = document_type
        self._cached_doc = cached_doc
        self.passthrough = passthrough
        super(LazyReference, self).__init__(self.document_type._get_collection_name(), pk)
    def __getitem__(self, name):
        if not self.passthrough:
            raise KeyError()
        document = self.fetch()
        return document[name]
    def __getattr__(self, name):
        if not object.__getattribute__(self, 'passthrough'):
            raise AttributeError()
        document = self.fetch()
        try:
-            return document[name]
+            super(SemiStrictDict, self).__getattr__(attr)
-        except KeyError:
+        except AttributeError:
-            raise AttributeError()
+            try:
                return self.__getattribute__('_extras')[attr]
            except KeyError as e:
                raise AttributeError(e)
-    def __repr__(self):
+    def __setattr__(self, attr, value):
-        return "<LazyReference(%s, %r)>" % (self.document_type, self.pk)
+        try:
            super(SemiStrictDict, self).__setattr__(attr, value)
        except AttributeError:
            try:
                self._extras[attr] = value
            except AttributeError:
                self._extras = {attr: value}
    def __delattr__(self, attr):
        try:
            super(SemiStrictDict, self).__delattr__(attr)
        except AttributeError:
            try:
                del self._extras[attr]
            except KeyError as e:
                raise AttributeError(e)
    def __iter__(self):
        try:
            extras_iter = iter(self.__getattribute__('_extras'))
        except AttributeError:
            extras_iter = ()
        return itertools.chain(super(SemiStrictDict, self).__iter__(), extras_iter)
--- a/mongoengine/base/document.py
+++ b/mongoengine/base/document.py
@@ -1,40 +1,30 @@
 import copy
 import numbers
 from collections import Hashable
 from functools import partial
-from bson import DBRef, ObjectId, SON, json_util
+from bson import ObjectId, json_util
 from bson.dbref import DBRef
 from bson.son import SON
 import pymongo
 import six
 from six import iteritems
 from mongoengine import signals
 from mongoengine.base.common import get_document
 from mongoengine.base.datastructures import (BaseDict, BaseList,
                                             EmbeddedDocumentList,
-                                             LazyReference,
+                                             SemiStrictDict, StrictDict)
                                             StrictDict)
 from mongoengine.base.fields import ComplexBaseField
 from mongoengine.common import _import_class
 from mongoengine.errors import (FieldDoesNotExist, InvalidDocumentError,
                                LookUpError, OperationError, ValidationError)
 from mongoengine.python_support import Hashable
-__all__ = ('BaseDocument', 'NON_FIELD_ERRORS')
+__all__ = ('BaseDocument',)
 NON_FIELD_ERRORS = '__all__'
 class BaseDocument(object):
    # TODO simplify how `_changed_fields` is used.
    # Currently, handling of `_changed_fields` seems unnecessarily convoluted:
    # 1. `BaseDocument` defines `_changed_fields` in its `__slots__`, yet it's
    #    not setting it to `[]` (or any other value) in `__init__`.
    # 2. `EmbeddedDocument` sets `_changed_fields` to `[]` it its overloaded
    #    `__init__`.
    # 3. `Document` does NOT set `_changed_fields` upon initialization. The
    #    field is primarily set via `_from_son` or `_clear_changed_fields`,
    #    though there are also other methods that manipulate it.
    # 4. The codebase is littered with `hasattr` calls for `_changed_fields`.
    __slots__ = ('_changed_fields', '_initialised', '_created', '_data',
                 '_dynamic_fields', '_auto_id_field', '_db_field_map',
                 '__weakref__')
@@ -45,20 +35,13 @@ class BaseDocument(object):
    def __init__(self, *args, **values):
        """
-        Initialise a document or an embedded document.
+        Initialise a document or embedded document
-        :param dict values: A dictionary of keys and values for the document.
+        :param __auto_convert: Try and will cast python objects to Object types
-            It may contain additional reserved keywords, e.g. "__auto_convert".
+        :param values: A dictionary of values for the document
        :param bool __auto_convert: If True, supplied values will be converted
            to Python-type values via each field's `to_python` method.
        :param set __only_fields: A set of fields that have been loaded for
            this document. Empty if all fields have been loaded.
        :param bool _created: Indicates whether this is a brand new document
            or whether it's already been persisted before. Defaults to true.
        """
        self._initialised = False
        self._created = True
        if args:
            # Combine positional arguments with named arguments.
            # We only want named arguments.
@@ -75,6 +58,7 @@ class BaseDocument(object):
        __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))
        _created = values.pop('_created', True)
@@ -95,14 +79,13 @@ class BaseDocument(object):
        if self.STRICT and not self._dynamic:
            self._data = StrictDict.create(allowed_keys=self._fields_ordered)()
        else:
-            self._data = {}
+            self._data = SemiStrictDict.create(
                allowed_keys=self._fields_ordered)()
        self._dynamic_fields = SON()
-        # Assign default values to the instance.
+        # Assign default values to instance
-        # We set default values only for fields loaded from DB. See
+        for key, field in self._fields.iteritems():
        # https://github.com/mongoengine/mongoengine/issues/399 for more info.
        for key, field in iteritems(self._fields):
            if self._db_field_map.get(key, key) in __only_fields:
                continue
            value = getattr(self, key, None)
@@ -114,14 +97,16 @@ class BaseDocument(object):
        # Set passed values after initialisation
        if self._dynamic:
            dynamic_data = {}
-            for key, value in iteritems(values):
+            for key, value in values.iteritems():
                if key in self._fields or key == '_id':
                    setattr(self, key, value)
-                else:
+                elif self._dynamic:
                    dynamic_data[key] = value
        else:
            FileField = _import_class('FileField')
-            for key, value in iteritems(values):
+            for key, value in values.iteritems():
                if key == '__auto_convert':
                    continue
                key = self._reverse_db_field_map.get(key, key)
                if key in self._fields or key in ('id', 'pk', '_cls'):
                    if __auto_convert and value is not None:
@@ -137,13 +122,12 @@ class BaseDocument(object):
        if self._dynamic:
            self._dynamic_lock = False
-            for key, value in iteritems(dynamic_data):
+            for key, value in dynamic_data.iteritems():
                setattr(self, key, value)
        # Flag initialised
        self._initialised = True
        self._created = _created
        signals.post_init.send(self.__class__, document=self)
    def __delattr__(self, *args, **kwargs):
@@ -163,7 +147,7 @@ class BaseDocument(object):
            if not hasattr(self, name) and not name.startswith('_'):
                DynamicField = _import_class('DynamicField')
-                field = DynamicField(db_field=name, null=True)
+                field = DynamicField(db_field=name)
                field.name = name
                self._dynamic_fields[name] = field
                self._fields_ordered += (name,)
@@ -288,6 +272,13 @@ 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.
@@ -312,14 +303,15 @@ class BaseDocument(object):
        """
        Return as SON data ready for use with MongoDB.
        """
-        fields = fields or []
+        if not fields:
            fields = []
        data = SON()
        data['_id'] = None
        data['_cls'] = self._class_name
        # only root fields ['test1.a', 'test2'] => ['test1', 'test2']
-        root_fields = {f.split('.')[0] for f in fields}
+        root_fields = set([f.split('.')[0] for f in fields])
        for field_name in self:
            if root_fields and field_name not in root_fields:
@@ -352,7 +344,7 @@ class BaseDocument(object):
                value = field.generate()
                self._data[field_name] = value
-            if (value is not None) or (field.null):
+            if value is not None:
                if use_db_field:
                    data[field.db_field] = value
                else:
@@ -367,9 +359,6 @@ class BaseDocument(object):
    def validate(self, clean=True):
        """Ensure that all fields' values are valid and that required fields
        are present.
        Raises :class:`ValidationError` if any of the fields' values are found
        to be invalid.
        """
        # Ensure that each field is matched to a valid value
        errors = {}
@@ -424,15 +413,7 @@ class BaseDocument(object):
    @classmethod
    def from_json(cls, json_data, created=False):
-        """Converts json data to a Document instance
+        """Converts json data to an unsaved document instance"""
        :param json_data: The json data to load into the Document
        :param created: If True, the document will be considered as a brand new document
                        If False and an id is provided, it will consider that the data being
                        loaded corresponds to what's already in the database (This has an impact of subsequent call to .save())
                        If False and no id is provided, it will consider the data as a new document
                        (default ``False``)
        """
        return cls._from_son(json_util.loads(json_data), created=created)
    def __expand_dynamic_values(self, name, value):
@@ -515,7 +496,7 @@ class BaseDocument(object):
                else:
                    data = getattr(data, part, None)
-                if not isinstance(data, LazyReference) and hasattr(data, '_changed_fields'):
+                if hasattr(data, '_changed_fields'):
                    if getattr(data, '_is_document', False):
                        continue
@@ -523,74 +504,76 @@ class BaseDocument(object):
        self._changed_fields = []
-    def _nestable_types_changed_fields(self, changed_fields, base_key, data):
+    def _nestable_types_changed_fields(self, changed_fields, key, data, inspected):
        """Inspect nested data for changed fields
        :param changed_fields: Previously collected changed fields
        :param base_key: The base key that must be used to prepend changes to this data
        :param data: data to inspect for changes
        """
        # Loop list / dict fields as they contain documents
        # Determine the iterator to use
        if not hasattr(data, 'items'):
            iterator = enumerate(data)
        else:
-            iterator = iteritems(data)
+            iterator = data.iteritems()
-        for index_or_key, value in iterator:
+        for index, value in iterator:
-            item_key = '%s%s.' % (base_key, index_or_key)
+            list_key = '%s%s.' % (key, index)
            # don't check anything lower if this key is already marked
            # as changed.
-            if item_key[:-1] in changed_fields:
+            if list_key[:-1] in changed_fields:
                continue
            if hasattr(value, '_get_changed_fields'):
-                changed = value._get_changed_fields()
+                changed = value._get_changed_fields(inspected)
-                changed_fields += ['%s%s' % (item_key, k) for k in changed if 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, item_key, value)
+                    changed_fields, list_key, value, inspected)
-    def _get_changed_fields(self):
+    def _get_changed_fields(self, inspected=None):
        """Return a list of all fields that have explicitly been changed.
        """
        EmbeddedDocument = _import_class('EmbeddedDocument')
        DynamicEmbeddedDocument = _import_class('DynamicEmbeddedDocument')
        ReferenceField = _import_class('ReferenceField')
        GenericReferenceField = _import_class('GenericReferenceField')
        SortedListField = _import_class('SortedListField')
        changed_fields = []
        changed_fields += getattr(self, '_changed_fields', [])
        inspected = inspected or set()
        if hasattr(self, 'id') and isinstance(self.id, Hashable):
            if self.id in inspected:
                return changed_fields
            inspected.add(self.id)
        for field_name in self._fields_ordered:
            db_field_name = self._db_field_map.get(field_name, field_name)
            key = '%s.' % db_field_name
            data = self._data.get(field_name, None)
            field = self._fields.get(field_name)
-            if db_field_name in changed_fields:
+            if hasattr(data, 'id'):
-                # Whole field already marked as changed, no need to go further
+                if data.id in inspected:
                    continue
-
+            if isinstance(field, ReferenceField):
            if isinstance(field, ReferenceField):   # Don't follow referenced documents
                continue
-
+            elif (
-            if isinstance(data, EmbeddedDocument):
+                isinstance(data, (EmbeddedDocument, DynamicEmbeddedDocument)) and
                db_field_name not in changed_fields
            ):
                # Find all embedded fields that have been changed
-                changed = data._get_changed_fields()
+                changed = data._get_changed_fields(inspected)
                changed_fields += ['%s%s' % (key, k) for k in changed if k]
-            elif isinstance(data, (list, tuple, dict)):
+            elif (isinstance(data, (list, tuple, dict)) and
                    db_field_name not in changed_fields):
                if (hasattr(field, 'field') and
-                        isinstance(field.field, (ReferenceField, GenericReferenceField))):
+                        isinstance(field.field, ReferenceField)):
                    continue
                elif isinstance(field, SortedListField) and field._ordering:
                    # if ordering is affected whole list is changed
-                    if any(field._ordering in d._changed_fields for d in data):
+                    if any(map(lambda d: field._ordering in d._changed_fields, data)):
                        changed_fields.append(db_field_name)
                        continue
                self._nestable_types_changed_fields(
-                    changed_fields, key, data)
+                    changed_fields, key, data, inspected)
        return changed_fields
    def _delta(self):
@@ -602,6 +585,7 @@ class BaseDocument(object):
        set_fields = self._get_changed_fields()
        unset_data = {}
        parts = []
        if hasattr(self, '_changed_fields'):
            set_data = {}
            # Fetch each set item from its path
@@ -611,13 +595,15 @@ class BaseDocument(object):
                new_path = []
                for p in parts:
                    if isinstance(d, (ObjectId, DBRef)):
                        # Don't dig in the references
                        break
-                    elif isinstance(d, list) and p.isdigit():
+                    elif isinstance(d, list) and p.lstrip('-').isdigit():
-                        # An item of a list (identified by its index) is updated
+                        if p[0] == '-':
                            p = str(len(d) + int(p))
                        try:
                            d = d[int(p)]
                        except IndexError:
                            d = None
                    elif hasattr(d, 'get'):
                        # dict-like (dict, embedded document)
                        d = d.get(p)
                    new_path.append(p)
                path = '.'.join(new_path)
@@ -629,26 +615,26 @@ class BaseDocument(object):
        # Determine if any changed items were actually unset.
        for path, value in set_data.items():
-            if value or isinstance(value, (numbers.Number, bool)):  # Account for 0 and True that are truthy
+            if value or isinstance(value, (numbers.Number, bool)):
                continue
-            parts = path.split('.')
+            # If we've set a value that ain't the default value don't unset it.
-
+            default = None
            if (self._dynamic and len(parts) and parts[0] in
                    self._dynamic_fields):
                del set_data[path]
                unset_data[path] = 1
                continue
-
+            elif path in self._fields:
            # If we've set a value that ain't the default value don't unset it.
            default = None
            if path in self._fields:
                default = self._fields[path].default
            else:  # Perform a full lookup for lists / embedded lookups
                d = self
                parts = path.split('.')
                db_field_name = parts.pop()
                for p in parts:
-                    if isinstance(d, list) and p.isdigit():
+                    if isinstance(d, list) and p.lstrip('-').isdigit():
                        if p[0] == '-':
                            p = str(len(d) + int(p))
                        d = d[int(p)]
                    elif (hasattr(d, '__getattribute__') and
                          not isinstance(d, dict)):
@@ -666,9 +652,10 @@ class BaseDocument(object):
                        default = None
            if default is not None:
-                default = default() if callable(default) else default
+                if callable(default):
                    default = default()
-            if value != default:
+            if default != value:
                continue
            del set_data[path]
@@ -684,7 +671,9 @@ class BaseDocument(object):
    @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 = []
@@ -695,25 +684,21 @@ class BaseDocument(object):
        # class if unavailable
        class_name = son.get('_cls', cls._class_name)
-        # Convert SON to a data dict, making sure each key is a string and
+        # Convert SON to a dict, making sure each key is a string
-        # corresponds to the right db field.
+        data = {str(key): value for key, value in son.iteritems()}
        data = {}
        for key, value in iteritems(son):
            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:
            cls = get_document(class_name)
        changed_fields = []
        errors_dict = {}
        fields = cls._fields
        if not _auto_dereference:
-            fields = copy.deepcopy(fields)
+            fields = copy.copy(fields)
-        for field_name, field in iteritems(fields):
+        for field_name, field in fields.iteritems():
            field._auto_dereference = _auto_dereference
            if field.db_field in data:
                value = data[field.db_field]
@@ -734,15 +719,10 @@ class BaseDocument(object):
        # In STRICT documents, remove any keys that aren't in cls._fields
        if cls.STRICT:
-            data = {k: v for k, v in iteritems(data) if k in cls._fields}
+            data = {k: v for k, v in data.iteritems() if k in cls._fields}
-        obj = cls(
+        obj = cls(__auto_convert=False, _created=created, __only_fields=only_fields, **data)
-            __auto_convert=False,
+        obj._changed_fields = changed_fields
            _created=created,
            __only_fields=only_fields,
            **data
        )
        obj._changed_fields = []
        if not _auto_dereference:
            obj._fields = fields
@@ -906,8 +886,7 @@ class BaseDocument(object):
                index = {'fields': fields, 'unique': True, 'sparse': sparse}
                unique_indexes.append(index)
-            if field.__class__.__name__ in {'EmbeddedDocumentListField',
+            if field.__class__.__name__ == 'ListField':
                                            'ListField', 'SortedListField'}:
                field = field.field
            # Grab any embedded document field unique indexes
@@ -1103,11 +1082,5 @@ class BaseDocument(object):
        """Return the display value for a choice field"""
        value = getattr(self, field.name)
        if field.choices and isinstance(field.choices[0], (list, tuple)):
-            if value is None:
+            return dict(field.choices).get(value, value)
                return None
            sep = getattr(field, 'display_sep', ' ')
            values = value if field.__class__.__name__ in ('ListField', 'SortedListField') else [value]
            return sep.join([
                six.text_type(dict(field.choices).get(val, val))
                for val in values or []])
        return value
--- a/mongoengine/base/fields.py
+++ b/mongoengine/base/fields.py
@@ -5,13 +5,13 @@ import weakref
 from bson import DBRef, ObjectId, SON
 import pymongo
 import six
 from six import iteritems
 from mongoengine.base.common import UPDATE_OPERATORS
 from mongoengine.base.datastructures import (BaseDict, BaseList,
                                             EmbeddedDocumentList)
 from mongoengine.common import _import_class
-from mongoengine.errors import DeprecatedError, ValidationError
+from mongoengine.errors import ValidationError
 __all__ = ('BaseField', 'ComplexBaseField', 'ObjectIdField',
           'GeoJsonBaseField')
@@ -52,10 +52,10 @@ class BaseField(object):
            unique with.
        :param primary_key: Mark this field as the primary key. Defaults to False.
        :param validation: (optional) A callable to validate the value of the
-            field.  The callable takes the value as parameter and should raise
+            field.  Generally this is deprecated in favour of the
-            a ValidationError if validation fails
+            `FIELD.validate` method
        :param choices: (optional) The valid choices
-        :param null: (optional) If the field value can be null. If no and there is a default value
+        :param null: (optional) Is the field value can be null. If no and there is a default value
            then the default value is set
        :param sparse: (optional) `sparse=True` combined with `unique=True` and `required=False`
            means that uniqueness won't be enforced for `None` values
@@ -81,14 +81,7 @@ class BaseField(object):
        self.sparse = sparse
        self._owner_document = None
-        # Make sure db_field is a string (if it's explicitly defined).
+        # Validate the db_field
        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
@@ -128,9 +121,11 @@ class BaseField(object):
        return instance._data.get(self.name)
    def __set__(self, instance, value):
-        """Descriptor for assigning a value to a field in a document."""
+        """Descriptor for assigning a value to a field in a document.
-        # If setting to None and there is a default value provided for this
+        """
-        # field, then set the value to the default value.
+
        # If setting to None and there is a default
        # Then set the value to the default value
        if value is None:
            if self.null:
                value = None
@@ -141,16 +136,12 @@ class BaseField(object):
        if instance._initialised:
            try:
-                value_has_changed = (
+                if (self.name not in instance._data or
-                    self.name not in instance._data or
+                        instance._data[self.name] != value):
                    instance._data[self.name] != value
                )
                if value_has_changed:
                    instance._mark_as_changed(self.name)
            except Exception:
-                # Some values can't be compared and throw an error when we
+                # Values cant be compared eg: naive and tz datetimes
-                # attempt to do so (e.g. tz-naive and tz-aware datetimes).
+                # So mark it as changed
                # Mark the field as changed in such cases.
                instance._mark_as_changed(self.name)
        EmbeddedDocument = _import_class('EmbeddedDocument')
@@ -160,7 +151,6 @@ class BaseField(object):
            for v in value:
                if isinstance(v, EmbeddedDocument):
                    v._instance = weakref.proxy(instance)
        instance._data[self.name] = value
    def error(self, message='', errors=None, field_name=None):
@@ -216,9 +206,7 @@ class BaseField(object):
                    )
                )
        # Choices which are types other than Documents
-        else:
+        elif value not in choice_list:
            values = value if isinstance(value, (list, tuple)) else [value]
            if len(set(values) - set(choice_list)):
            self.error('Value must be one of %s' % six.text_type(choice_list))
    def _validate(self, value, **kwargs):
@@ -229,18 +217,10 @@ class BaseField(object):
        # check validation argument
        if self.validation is not None:
            if callable(self.validation):
-                try:
+                if not self.validation(value):
-                    # breaking change of 0.18
+                    self.error('Value does not match custom validation method')
                    # Get rid of True/False-type return for the validation method
                    # in favor of having validation raising a ValidationError
                    ret = self.validation(value)
                    if ret is not None:
                        raise DeprecatedError('validation argument for `%s` must not return anything, '
                                              'it should raise a ValidationError if validation fails' % self.name)
                except ValidationError as ex:
                    self.error(str(ex))
            else:
-                raise ValueError('validation argument for `"%s"` must be a '
+                raise ValueError('validation argument for "%s" must be a '
                                 'callable.' % self.name)
        self.validate(value, **kwargs)
@@ -278,25 +258,18 @@ class ComplexBaseField(BaseField):
        ReferenceField = _import_class('ReferenceField')
        GenericReferenceField = _import_class('GenericReferenceField')
        EmbeddedDocumentListField = _import_class('EmbeddedDocumentListField')
-
+        dereference = (self._auto_dereference and
        auto_dereference = instance._fields[self.name]._auto_dereference
        dereference = (auto_dereference and
                       (self.field is None or isinstance(self.field,
                                                         (GenericReferenceField, ReferenceField))))
        _dereference = _import_class('DeReference')()
-        if (instance._initialised and
+        self._auto_dereference = instance._fields[self.name]._auto_dereference
-                dereference and
+        if instance._initialised and dereference and instance._data.get(self.name):
                instance._data.get(self.name) and
                not getattr(instance._data[self.name], '_dereferenced', False)):
            instance._data[self.name] = _dereference(
                instance._data.get(self.name), max_depth=1, instance=instance,
                name=self.name
            )
            if hasattr(instance._data[self.name], '_dereferenced'):
                instance._data[self.name]._dereferenced = True
        value = super(ComplexBaseField, self).__get__(instance, owner)
@@ -312,7 +285,7 @@ class ComplexBaseField(BaseField):
            value = BaseDict(value, instance, self.name)
            instance._data[self.name] = value
-        if (auto_dereference and instance._initialised and
+        if (self._auto_dereference and instance._initialised and
                isinstance(value, (BaseList, BaseDict)) and
                not value._dereferenced):
            value = _dereference(
@@ -331,16 +304,11 @@ class ComplexBaseField(BaseField):
        if hasattr(value, 'to_python'):
            return value.to_python()
        BaseDocument = _import_class('BaseDocument')
        if isinstance(value, BaseDocument):
            # Something is wrong, return the value as it is
            return value
        is_list = False
        if not hasattr(value, 'items'):
            try:
                is_list = True
-                value = {idx: v for idx, v in enumerate(value)}
+                value = {k: v for k, v in enumerate(value)}
            except TypeError:  # Not iterable return the value
                return value
@@ -399,11 +367,11 @@ class ComplexBaseField(BaseField):
        if self.field:
            value_dict = {
                key: self.field._to_mongo_safe_call(item, use_db_field, fields)
-                for key, item in iteritems(value)
+                for key, item in value.iteritems()
            }
        else:
            value_dict = {}
-            for k, v in iteritems(value):
+            for k, v in value.iteritems():
                if isinstance(v, Document):
                    # We need the id from the saved object to create the DBRef
                    if v.pk is None:
@@ -440,7 +408,7 @@ class ComplexBaseField(BaseField):
        errors = {}
        if self.field:
            if hasattr(value, 'iteritems') or hasattr(value, 'items'):
-                sequence = iteritems(value)
+                sequence = value.iteritems()
            else:
                sequence = enumerate(value)
            for k, v in sequence:
@@ -525,7 +493,7 @@ class GeoJsonBaseField(BaseField):
    def validate(self, value):
        """Validate the GeoJson object based on its type."""
        if isinstance(value, dict):
-            if set(value.keys()) == {'type', 'coordinates'}:
+            if set(value.keys()) == set(['type', 'coordinates']):
                if value['type'] != self._type:
                    self.error('%s type must be "%s"' %
                               (self._name, self._type))
--- a/mongoengine/base/metaclasses.py
+++ b/mongoengine/base/metaclasses.py
@@ -1,7 +1,6 @@
 import warnings
 import six
 from six import iteritems, itervalues
 from mongoengine.base.common import _document_registry
 from mongoengine.base.fields import BaseField, ComplexBaseField, ObjectIdField
@@ -19,14 +18,14 @@ class DocumentMetaclass(type):
    """Metaclass for all documents."""
    # TODO lower complexity of this method
-    def __new__(mcs, name, bases, attrs):
+    def __new__(cls, name, bases, attrs):
-        flattened_bases = mcs._get_bases(bases)
+        flattened_bases = cls._get_bases(bases)
-        super_new = super(DocumentMetaclass, mcs).__new__
+        super_new = super(DocumentMetaclass, cls).__new__
        # If a base class just call super
        metaclass = attrs.get('my_metaclass')
        if metaclass and issubclass(metaclass, DocumentMetaclass):
-            return super_new(mcs, name, bases, attrs)
+            return super_new(cls, name, bases, attrs)
        attrs['_is_document'] = attrs.get('_is_document', False)
        attrs['_cached_reference_fields'] = []
@@ -63,7 +62,7 @@ class DocumentMetaclass(type):
            # Standard object mixin - merge in any Fields
            if not hasattr(base, '_meta'):
                base_fields = {}
-                for attr_name, attr_value in iteritems(base.__dict__):
+                for attr_name, attr_value in base.__dict__.iteritems():
                    if not isinstance(attr_value, BaseField):
                        continue
                    attr_value.name = attr_name
@@ -75,7 +74,7 @@ class DocumentMetaclass(type):
        # Discover any document fields
        field_names = {}
-        for attr_name, attr_value in iteritems(attrs):
+        for attr_name, attr_value in attrs.iteritems():
            if not isinstance(attr_value, BaseField):
                continue
            attr_value.name = attr_name
@@ -104,7 +103,7 @@ class DocumentMetaclass(type):
        attrs['_fields_ordered'] = tuple(i[1] for i in sorted(
                                         (v.creation_counter, v.name)
-                                         for v in itervalues(doc_fields)))
+                                         for v in doc_fields.itervalues()))
        #
        # Set document hierarchy
@@ -122,8 +121,7 @@ class DocumentMetaclass(type):
                # inheritance of classes where inheritance is set to False
                allow_inheritance = base._meta.get('allow_inheritance')
                if not allow_inheritance and not base._meta.get('abstract'):
-                    raise ValueError('Document %s may not be subclassed. '
+                    raise ValueError('Document %s may not be subclassed' %
                                     'To enable inheritance, use the "allow_inheritance" meta attribute.' %
                                     base.__name__)
        # Get superclasses from last base superclass
@@ -140,7 +138,7 @@ class DocumentMetaclass(type):
        attrs['_types'] = attrs['_subclasses']  # TODO depreciate _types
        # Create the new_class
-        new_class = super_new(mcs, name, bases, attrs)
+        new_class = super_new(cls, name, bases, attrs)
        # Set _subclasses
        for base in document_bases:
@@ -149,7 +147,7 @@ class DocumentMetaclass(type):
            base._types = base._subclasses  # TODO depreciate _types
        (Document, EmbeddedDocument, DictField,
-         CachedReferenceField) = mcs._import_classes()
+         CachedReferenceField) = cls._import_classes()
        if issubclass(new_class, Document):
            new_class._collection = None
@@ -174,7 +172,7 @@ class DocumentMetaclass(type):
                        f.__dict__.update({'im_self': getattr(f, '__self__')})
        # Handle delete rules
-        for field in itervalues(new_class._fields):
+        for field in new_class._fields.itervalues():
            f = field
            if f.owner_document is None:
                f.owner_document = new_class
@@ -184,6 +182,9 @@ class DocumentMetaclass(type):
                if issubclass(new_class, EmbeddedDocument):
                    raise InvalidDocumentError('CachedReferenceFields is not '
                                               'allowed in EmbeddedDocuments')
                if not f.document_type:
                    raise InvalidDocumentError(
                        'Document is not available to sync')
                if f.auto_sync:
                    f.start_listener()
@@ -218,26 +219,29 @@ class DocumentMetaclass(type):
        return new_class
    def add_to_class(self, name, value):
        setattr(self, name, value)
    @classmethod
-    def _get_bases(mcs, bases):
+    def _get_bases(cls, bases):
        if isinstance(bases, BasesTuple):
            return bases
        seen = []
-        bases = mcs.__get_bases(bases)
+        bases = cls.__get_bases(bases)
        unique_bases = (b for b in bases if not (b in seen or seen.append(b)))
        return BasesTuple(unique_bases)
    @classmethod
-    def __get_bases(mcs, bases):
+    def __get_bases(cls, bases):
        for base in bases:
            if base is object:
                continue
            yield base
-            for child_base in mcs.__get_bases(base.__bases__):
+            for child_base in cls.__get_bases(base.__bases__):
                yield child_base
    @classmethod
-    def _import_classes(mcs):
+    def _import_classes(cls):
        Document = _import_class('Document')
        EmbeddedDocument = _import_class('EmbeddedDocument')
        DictField = _import_class('DictField')
@@ -250,9 +254,9 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
    collection in the database.
    """
-    def __new__(mcs, name, bases, attrs):
+    def __new__(cls, name, bases, attrs):
-        flattened_bases = mcs._get_bases(bases)
+        flattened_bases = cls._get_bases(bases)
-        super_new = super(TopLevelDocumentMetaclass, mcs).__new__
+        super_new = super(TopLevelDocumentMetaclass, cls).__new__
        # Set default _meta data if base class, otherwise get user defined meta
        if attrs.get('my_metaclass') == TopLevelDocumentMetaclass:
@@ -315,7 +319,7 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
                    not parent_doc_cls._meta.get('abstract', False)):
                msg = 'Abstract document cannot have non-abstract base'
                raise ValueError(msg)
-            return super_new(mcs, name, bases, attrs)
+            return super_new(cls, name, bases, attrs)
        # Merge base class metas.
        # Uses a special MetaDict that handles various merging rules
@@ -356,7 +360,7 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
        attrs['_meta'] = meta
        # Call super and get the new class
-        new_class = super_new(mcs, name, bases, attrs)
+        new_class = super_new(cls, name, bases, attrs)
        meta = new_class._meta
@@ -373,7 +377,7 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
            new_class.objects = QuerySetManager()
        # Validate the fields and set primary key if needed
-        for field_name, field in iteritems(new_class._fields):
+        for field_name, field in new_class._fields.iteritems():
            if field.primary_key:
                # Ensure only one primary key is set
                current_pk = new_class._meta.get('id_field')
@@ -390,7 +394,7 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
                                           '_auto_id_field', False)
        if not new_class._meta.get('id_field'):
            # After 0.10, find not existing names, instead of overwriting
-            id_name, id_db_name = mcs.get_auto_id_names(new_class)
+            id_name, id_db_name = cls.get_auto_id_names(new_class)
            new_class._auto_id_field = True
            new_class._meta['id_field'] = id_name
            new_class._fields[id_name] = ObjectIdField(db_field=id_db_name)
@@ -415,7 +419,7 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
        return new_class
    @classmethod
-    def get_auto_id_names(mcs, new_class):
+    def get_auto_id_names(cls, new_class):
        id_name, id_db_name = ('id', '_id')
        if id_name not in new_class._fields and \
                id_db_name not in (v.db_field for v in new_class._fields.values()):
@@ -436,7 +440,7 @@ class MetaDict(dict):
    _merge_options = ('indexes',)
    def merge(self, new_options):
-        for k, v in iteritems(new_options):
+        for k, v in new_options.iteritems():
            if k in self._merge_options:
                self[k] = self.get(k, []) + v
            else:
--- a/mongoengine/base/utils.py
+++ b/mongoengine/base/utils.py
@@ -1,22 +0,0 @@
 import re
 class LazyRegexCompiler(object):
    """Descriptor to allow lazy compilation of regex"""
    def __init__(self, pattern, flags=0):
        self._pattern = pattern
        self._flags = flags
        self._compiled_regex = None
    @property
    def compiled_regex(self):
        if self._compiled_regex is None:
            self._compiled_regex = re.compile(self._pattern, self._flags)
        return self._compiled_regex
    def __get__(self, instance, owner):
        return self.compiled_regex
    def __set__(self, instance, value):
        raise AttributeError("Can not set attribute LazyRegexCompiler")
--- a/mongoengine/common.py
+++ b/mongoengine/common.py
@@ -31,6 +31,7 @@ def _import_class(cls_name):
    field_classes = _field_list_cache
    queryset_classes = ('OperationError',)
    deref_classes = ('DeReference',)
    if cls_name == 'BaseDocument':
@@ -42,11 +43,14 @@ def _import_class(cls_name):
    elif cls_name in field_classes:
        from mongoengine import fields as module
        import_classes = field_classes
    elif cls_name in queryset_classes:
        from mongoengine import queryset as module
        import_classes = queryset_classes
    elif cls_name in deref_classes:
        from mongoengine import dereference as module
        import_classes = deref_classes
    else:
-        raise ValueError('No import set for: %s' % cls_name)
+        raise ValueError('No import set for: ' % cls_name)
    for cls in import_classes:
        _class_registry_cache[cls] = getattr(module, cls)
--- a/mongoengine/connection.py
+++ b/mongoengine/connection.py
@@ -1,30 +1,19 @@
 from pymongo import MongoClient, ReadPreference, uri_parser
 from pymongo.database import _check_name
 import six
-__all__ = [
+from mongoengine.python_support import IS_PYMONGO_3
-    'DEFAULT_CONNECTION_NAME',
+
-    'DEFAULT_DATABASE_NAME',
+__all__ = ['MongoEngineConnectionError', 'connect', 'register_connection',
-    'MongoEngineConnectionError',
+           'DEFAULT_CONNECTION_NAME']
    'connect',
    'disconnect',
    'disconnect_all',
    'get_connection',
    'get_db',
    'register_connection',
 ]
 DEFAULT_CONNECTION_NAME = 'default'
 DEFAULT_DATABASE_NAME = 'test'
 DEFAULT_HOST = 'localhost'
 DEFAULT_PORT = 27017
-_connection_settings = {}
+if IS_PYMONGO_3:
-_connections = {}
+    READ_PREFERENCE = ReadPreference.PRIMARY
-_dbs = {}
+else:
-
+    from pymongo import MongoReplicaSetClient
-READ_PREFERENCE = ReadPreference.PRIMARY
+    READ_PREFERENCE = False
 class MongoEngineConnectionError(Exception):
@@ -34,48 +23,44 @@ class MongoEngineConnectionError(Exception):
    pass
-def _check_db_name(name):
+_connection_settings = {}
-    """Check if a database name is valid.
+_connections = {}
-    This functionality is copied from pymongo Database class constructor.
+_dbs = {}
    """
    if not isinstance(name, six.string_types):
        raise TypeError('name must be an instance of %s' % six.string_types)
    elif name != '$external':
        _check_name(name)
-def _get_connection_settings(
+def register_connection(alias, name=None, host=None, port=None,
        db=None, name=None, host=None, port=None,
                        read_preference=READ_PREFERENCE,
                        username=None, password=None,
                        authentication_source=None,
                        authentication_mechanism=None,
                        **kwargs):
-    """Get the connection settings as a dict
+    """Add a connection.
-    : param db: the name of the database to use, for compatibility with connect
+    :param alias: the name that will be used to refer to this connection
-    : param name: the name of the specific database to use
+        throughout MongoEngine
-    : param host: the host name of the: program: `mongod` instance to connect to
+    :param name: the name of the specific database to use
-    : param port: the port that the: program: `mongod` instance is running on
+    :param host: the host name of the :program:`mongod` instance to connect to
-    : param read_preference: The read preference for the collection
+    :param port: the port that the :program:`mongod` instance is running on
-    : param username: username to authenticate with
+    :param read_preference: The read preference for the collection
-    : param password: password to authenticate with
+       ** Added pymongo 2.1
-    : param authentication_source: database to authenticate against
+    :param username: username to authenticate with
-    : param authentication_mechanism: database authentication mechanisms.
+    :param password: password to authenticate with
    :param authentication_source: database to authenticate against
    :param authentication_mechanism: database authentication mechanisms.
        By default, use SCRAM-SHA-1 with MongoDB 3.0 and later,
        MONGODB-CR (MongoDB Challenge Response protocol) for older servers.
-    : param is_mock: explicitly use mongomock for this connection
+    :param is_mock: explicitly use mongomock for this connection
-        (can also be done by using `mongomock: // ` as db host prefix)
+        (can also be done by using `mongomock://` as db host prefix)
-    : param kwargs: 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
    """
    conn_settings = {
-        'name': name or db or DEFAULT_DATABASE_NAME,
+        'name': name or 'test',
-        'host': host or DEFAULT_HOST,
+        'host': host or 'localhost',
-        'port': port or DEFAULT_PORT,
+        'port': port or 27017,
        'read_preference': read_preference,
        'username': username,
        'password': password,
@@ -83,7 +68,6 @@ def _get_connection_settings(
        'authentication_mechanism': authentication_mechanism
    }
    _check_db_name(conn_settings['name'])
    conn_host = conn_settings['host']
    # Host can be a list or a string, so if string, force to a list.
@@ -119,30 +103,6 @@ def _get_connection_settings(
                conn_settings['authentication_source'] = uri_options['authsource']
            if 'authmechanism' in uri_options:
                conn_settings['authentication_mechanism'] = uri_options['authmechanism']
            if 'readpreference' in uri_options:
                read_preferences = (
                    ReadPreference.NEAREST,
                    ReadPreference.PRIMARY,
                    ReadPreference.PRIMARY_PREFERRED,
                    ReadPreference.SECONDARY,
                    ReadPreference.SECONDARY_PREFERRED,
                )
                # Starting with PyMongo v3.5, the "readpreference" option is
                # returned as a string (e.g. "secondaryPreferred") and not an
                # int (e.g. 3).
                # TODO simplify the code below once we drop support for
                # PyMongo v3.4.
                read_pf_mode = uri_options['readpreference']
                if isinstance(read_pf_mode, six.string_types):
                    read_pf_mode = read_pf_mode.lower()
                for preference in read_preferences:
                    if (
                        preference.name.lower() == read_pf_mode or
                        preference.mode == read_pf_mode
                    ):
                        conn_settings['read_preference'] = preference
                        break
        else:
            resolved_hosts.append(entity)
    conn_settings['host'] = resolved_hosts
@@ -152,74 +112,17 @@ def _get_connection_settings(
    kwargs.pop('is_slave', None)
    conn_settings.update(kwargs)
    return conn_settings
 def register_connection(alias, db=None, name=None, host=None, port=None,
                        read_preference=READ_PREFERENCE,
                        username=None, password=None,
                        authentication_source=None,
                        authentication_mechanism=None,
                        **kwargs):
    """Register the connection settings.
    : param alias: the name that will be used to refer to this connection
        throughout MongoEngine
    : param name: the name of the specific database to use
    : param db: the name of the database to use, for compatibility with connect
    : param host: the host name of the: program: `mongod` instance to connect to
    : param port: the port that the: program: `mongod` instance is running on
    : param read_preference: The read preference for the collection
    : param username: username to authenticate with
    : param password: password to authenticate with
    : param authentication_source: database to authenticate against
    : param authentication_mechanism: database authentication mechanisms.
        By default, use SCRAM-SHA-1 with MongoDB 3.0 and later,
        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: 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
    """
    conn_settings = _get_connection_settings(
        db=db, name=name, host=host, port=port,
        read_preference=read_preference,
        username=username, password=password,
        authentication_source=authentication_source,
        authentication_mechanism=authentication_mechanism,
        **kwargs)
    _connection_settings[alias] = conn_settings
 def disconnect(alias=DEFAULT_CONNECTION_NAME):
    """Close the connection with a given alias."""
    from mongoengine.base.common import _get_documents_by_db
    from mongoengine import Document
    if alias in _connections:
        get_connection(alias=alias).close()
        del _connections[alias]
    if alias in _dbs:
        # Detach all cached collections in Documents
        for doc_cls in _get_documents_by_db(alias, DEFAULT_CONNECTION_NAME):
            if issubclass(doc_cls, Document):     # Skip EmbeddedDocument
                doc_cls._disconnect()
        del _dbs[alias]
    if alias in _connection_settings:
        del _connection_settings[alias]
 def disconnect_all():
    """Close all registered database."""
    for alias in list(_connections.keys()):
        disconnect(alias)
 def get_connection(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
    """Return a connection with a given alias."""
@@ -243,21 +146,19 @@ def get_connection(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
        raise MongoEngineConnectionError(msg)
    def _clean_settings(settings_dict):
-        irrelevant_fields_set = {
+        irrelevant_fields = set([
-            'name', 'username', 'password',
+            'name', 'username', 'password', 'authentication_source',
-            'authentication_source', 'authentication_mechanism'
+            'authentication_mechanism'
-        }
+        ])
        return {
            k: v for k, v in settings_dict.items()
-            if k not in irrelevant_fields_set
+            if k not in irrelevant_fields
        }
    raw_conn_settings = _connection_settings[alias].copy()
    # 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(raw_conn_settings)
+    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)
@@ -271,58 +172,49 @@ def get_connection(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
    else:
        connection_class = MongoClient
-    # Re-use existing connection if one is suitable.
+        # For replica set connections with PyMongo 2.x, use
-    existing_connection = _find_existing_connection(raw_conn_settings)
+        # MongoReplicaSetClient.
-    if existing_connection:
+        # TODO remove this once we stop supporting PyMongo 2.x.
-        connection = existing_connection
+        if 'replicaSet' in conn_settings and not IS_PYMONGO_3:
-    else:
+            connection_class = MongoReplicaSetClient
-        connection = _create_connection(
+            conn_settings['hosts_or_uri'] = conn_settings.pop('host', None)
-            alias=alias,
+
-            connection_class=connection_class,
+            # hosts_or_uri has to be a string, so if 'host' was provided
-            **conn_settings
+            # 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'])
            # Discard port since it can't be used on MongoReplicaSetClient
            conn_settings.pop('port', 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()
    )
-    _connections[alias] = connection
+    for db_alias, connection_settings in connection_settings_iterator:
-    return _connections[alias]
+        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
-def _create_connection(alias, connection_class, **connection_settings):
+    if existing_connection:
-    """
+        _connections[alias] = existing_connection
-    Create the new connection for this alias. Raise
+    else:
-    MongoEngineConnectionError if it can't be established.
+        # Otherwise, create the new connection for this alias. Raise
-    """
+        # MongoEngineConnectionError if it can't be established.
        try:
-        return connection_class(**connection_settings)
+            _connections[alias] = connection_class(**conn_settings)
        except Exception as e:
            raise MongoEngineConnectionError(
                'Cannot connect to database %s :\n%s' % (alias, e))
-
+    return _connections[alias]
 def _find_existing_connection(connection_settings):
    """
    Check if an existing connection could be reused
    Iterate over all of the connection settings and if an existing connection
    with the same parameters is suitable, return it
    :param connection_settings: the settings of the new connection
    :return: An existing connection or None
    """
    connection_settings_bis = (
        (db_alias, settings.copy())
        for db_alias, settings in _connection_settings.items()
    )
    def _clean_settings(settings_dict):
        # Only remove the name but it's important to
        # keep the username/password/authentication_source/authentication_mechanism
        # to identify if the connection could be shared (cfr https://github.com/MongoEngine/mongoengine/issues/2047)
        return {k: v for k, v in settings_dict.items() if k != 'name'}
    cleaned_conn_settings = _clean_settings(connection_settings)
    for db_alias, connection_settings in connection_settings_bis:
        db_conn_settings = _clean_settings(connection_settings)
        if cleaned_conn_settings == db_conn_settings and _connections.get(db_alias):
            return _connections[db_alias]
 def get_db(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
@@ -352,27 +244,14 @@ def connect(db=None, alias=DEFAULT_CONNECTION_NAME, **kwargs):
    provide username and password arguments as well.
    Multiple databases are supported by using aliases. Provide a separate
-    `alias` to connect to a different instance of: program: `mongod`.
+    `alias` to connect to a different instance of :program:`mongod`.
    In order to replace a connection identified by a given alias, you'll
    need to call ``disconnect`` first
    See the docstring for `register_connection` for more details about all
    supported kwargs.
    .. versionchanged:: 0.6 - added multiple database support.
    """
-    if alias in _connections:
+    if alias not in _connections:
        prev_conn_setting = _connection_settings[alias]
        new_conn_settings = _get_connection_settings(db, **kwargs)
        if new_conn_settings != prev_conn_setting:
            err_msg = (
                u'A different connection with alias `{}` was already '
                u'registered. Use disconnect() first'
            ).format(alias)
            raise MongoEngineConnectionError(err_msg)
    else:
        register_connection(alias, db, **kwargs)
    return get_connection(alias)
--- a/mongoengine/context_managers.py
+++ b/mongoengine/context_managers.py
@@ -1,14 +1,9 @@
 from contextlib import contextmanager
 from pymongo.write_concern import WriteConcern
 from six import iteritems
 from mongoengine.common import _import_class
 from mongoengine.connection import DEFAULT_CONNECTION_NAME, get_db
-from mongoengine.pymongo_support import count_documents
+
 __all__ = ('switch_db', 'switch_collection', 'no_dereference',
-           'no_sub_classes', 'query_counter', 'set_write_concern')
+           'no_sub_classes', 'query_counter')
 class switch_db(object):
@@ -115,7 +110,7 @@ class no_dereference(object):
        GenericReferenceField = _import_class('GenericReferenceField')
        ComplexBaseField = _import_class('ComplexBaseField')
-        self.deref_fields = [k for k, v in iteritems(self.cls._fields)
+        self.deref_fields = [k for k, v in self.cls._fields.iteritems()
                             if isinstance(v, (ReferenceField,
                                               GenericReferenceField,
                                               ComplexBaseField))]
@@ -148,85 +143,66 @@ class no_sub_classes(object):
        :param cls: the class to turn querying sub classes on
        """
        self.cls = cls
        self.cls_initial_subclasses = None
    def __enter__(self):
        """Change the objects default and _auto_dereference values."""
-        self.cls_initial_subclasses = self.cls._subclasses
+        self.cls._all_subclasses = self.cls._subclasses
-        self.cls._subclasses = (self.cls._class_name,)
+        self.cls._subclasses = (self.cls,)
        return self.cls
    def __exit__(self, t, value, traceback):
        """Reset the default and _auto_dereference values."""
-        self.cls._subclasses = self.cls_initial_subclasses
+        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."""
    This works by updating the `profiling_level` of the database so that all queries get logged,
    resetting the db.system.profile collection at the beginnig of the context and counting the new entries.
    This was designed for debugging purpose. In fact it is a global counter so queries issued by other threads/processes
    can interfere with it
    Be aware that:
    - Iterating over large amount of documents (>101) makes pymongo issue `getmore` queries to fetch the next batch of
        documents (https://docs.mongodb.com/manual/tutorial/iterate-a-cursor/#cursor-batches)
    - Some queries are ignored by default by the counter (killcursors, db.system.indexes)
    """
    def __init__(self):
-        """Construct the query_counter
+        """Construct the query_counter."""
-        """
+        self.counter = 0
        self.db = get_db()
        self.initial_profiling_level = None
        self._ctx_query_counter = 0             # number of queries issued by the context
-        self._ignored_query = {
+    def __enter__(self):
-            'ns':
+        """On every with block we need to drop the profile collection."""
                {'$ne': '%s.system.indexes' % self.db.name},
            'op':                       # MONGODB < 3.2
                {'$ne': 'killcursors'},
            'command.killCursors':      # MONGODB >= 3.2
                {'$exists': False}
        }
    def _turn_on_profiling(self):
        self.initial_profiling_level = self.db.profiling_level()
        self.db.set_profiling_level(0)
        self.db.system.profile.drop()
        self.db.set_profiling_level(2)
    def _resets_profiling(self):
        self.db.set_profiling_level(self.initial_profiling_level)
    def __enter__(self):
        self._turn_on_profiling()
        return self
    def __exit__(self, t, value, traceback):
-        self._resets_profiling()
+        """Reset the profiling level."""
        self.db.set_profiling_level(0)
    def __eq__(self, value):
        """== Compare querycounter."""
        counter = self._get_count()
        return value == counter
    def __ne__(self, value):
        """!= Compare querycounter."""
        return not self.__eq__(value)
    def __lt__(self, value):
        """< Compare querycounter."""
        return self._get_count() < value
    def __le__(self, value):
        """<= Compare querycounter."""
        return self._get_count() <= value
    def __gt__(self, value):
        """> Compare querycounter."""
        return self._get_count() > value
    def __ge__(self, value):
        """>= Compare querycounter."""
        return self._get_count() >= value
    def __int__(self):
        """int representation."""
        return self._get_count()
    def __repr__(self):
@@ -234,17 +210,8 @@ class query_counter(object):
        return u"%s" % self._get_count()
    def _get_count(self):
-        """Get the number of queries by counting the current number of entries in db.system.profile
+        """Get the number of queries."""
-        and substracting the queries issued by this context. In fact everytime this is called, 1 query is
+        ignore_query = {'ns': {'$ne': '%s.system.indexes' % self.db.name}}
-        issued so we need to balance that
+        count = self.db.system.profile.find(ignore_query).count() - self.counter
-        """
+        self.counter += 1
        count = count_documents(self.db.system.profile, self._ignored_query) - self._ctx_query_counter
        self._ctx_query_counter += 1    # Account for the query we just issued to gather the information
        return count
@contextmanager
 def set_write_concern(collection, write_concerns):
    combined_concerns = dict(collection.write_concern.document.items())
    combined_concerns.update(write_concerns)
    yield collection.with_options(write_concern=WriteConcern(**combined_concerns))
--- a/mongoengine/dereference.py
+++ b/mongoengine/dereference.py
@@ -1,10 +1,8 @@
 from bson import DBRef, SON
 import six
 from six import iteritems
 from mongoengine.base import (BaseDict, BaseList, EmbeddedDocumentList,
                              TopLevelDocumentMetaclass, get_document)
 from mongoengine.base.datastructures import LazyReference
 from mongoengine.connection import get_db
 from mongoengine.document import Document, EmbeddedDocument
 from mongoengine.fields import DictField, ListField, MapField, ReferenceField
@@ -53,40 +51,26 @@ class DeReference(object):
                        [i.__class__ == doc_type for i in items.values()]):
                    return items
                elif not field.dbref:
-                    # We must turn the ObjectIds into DBRefs
+                    if not hasattr(items, 'items'):
-                    # Recursively dig into the sub items of a list/dict
+                        def _get_items(items):
                    # to turn the ObjectIds into DBRefs
                    def _get_items_from_list(items):
                            new_items = []
                            for v in items:
                            value = v
                            if isinstance(v, dict):
                                value = _get_items_from_dict(v)
                            elif isinstance(v, list):
                                value = _get_items_from_list(v)
                            elif not isinstance(v, (DBRef, Document)):
                                value = field.to_python(v)
                            new_items.append(value)
                        return new_items
                    def _get_items_from_dict(items):
                        new_items = {}
                        for k, v in iteritems(items):
                            value = v
                                if isinstance(v, list):
-                                value = _get_items_from_list(v)
+                                    new_items.append(_get_items(v))
                            elif isinstance(v, dict):
                                value = _get_items_from_dict(v)
                                elif not isinstance(v, (DBRef, Document)):
-                                value = field.to_python(v)
+                                    new_items.append(field.to_python(v))
-                            new_items[k] = value
+                                else:
                                    new_items.append(v)
                            return new_items
-                    if not hasattr(items, 'items'):
+                        items = _get_items(items)
                        items = _get_items_from_list(items)
                    else:
-                        items = _get_items_from_dict(items)
+                        items = {
                            k: (v if isinstance(v, (DBRef, Document))
                                else field.to_python(v))
                            for k, v in items.iteritems()
                        }
        self.reference_map = self._find_references(items)
        self.object_map = self._fetch_objects(doc_type=doc_type)
@@ -113,32 +97,26 @@ class DeReference(object):
        depth += 1
        for item in iterator:
            if isinstance(item, (Document, EmbeddedDocument)):
-                for field_name, field in iteritems(item._fields):
+                for field_name, field in item._fields.iteritems():
                    v = item._data.get(field_name, None)
-                    if isinstance(v, LazyReference):
+                    if isinstance(v, DBRef):
                        # LazyReference inherits DBRef but should not be dereferenced here !
                        continue
                    elif isinstance(v, DBRef):
                        reference_map.setdefault(field.document_type, set()).add(v.id)
                    elif isinstance(v, (dict, SON)) and '_ref' in v:
                        reference_map.setdefault(get_document(v['_cls']), set()).add(v['_ref'].id)
                    elif isinstance(v, (dict, list, tuple)) and depth <= self.max_depth:
                        field_cls = getattr(getattr(field, 'field', None), 'document_type', None)
                        references = self._find_references(v, depth)
-                        for key, refs in iteritems(references):
+                        for key, refs in references.iteritems():
                            if isinstance(field_cls, (Document, TopLevelDocumentMetaclass)):
                                key = field_cls
                            reference_map.setdefault(key, set()).update(refs)
            elif isinstance(item, LazyReference):
                # LazyReference inherits DBRef but should not be dereferenced here !
                continue
            elif isinstance(item, DBRef):
                reference_map.setdefault(item.collection, set()).add(item.id)
            elif isinstance(item, (dict, SON)) and '_ref' in item:
                reference_map.setdefault(get_document(item['_cls']), set()).add(item['_ref'].id)
            elif isinstance(item, (dict, list, tuple)) and depth - 1 <= self.max_depth:
                references = self._find_references(item, depth - 1)
-                for key, refs in iteritems(references):
+                for key, refs in references.iteritems():
                    reference_map.setdefault(key, set()).update(refs)
        return reference_map
@@ -147,21 +125,16 @@ class DeReference(object):
        """Fetch all references and convert to their document objects
        """
        object_map = {}
-        for collection, dbrefs in iteritems(self.reference_map):
+        for collection, dbrefs in self.reference_map.iteritems():
-
+            if hasattr(collection, 'objects'):  # We have a document class for the refs
            # we use getattr instead of hasattr because hasattr swallows any exception under python2
            # so it could hide nasty things without raising exceptions (cfr bug #1688))
            ref_document_cls_exists = (getattr(collection, 'objects', None) is not None)
            if ref_document_cls_exists:
                col_name = collection._get_collection_name()
                refs = [dbref for dbref in dbrefs
                        if (col_name, dbref) not in object_map]
                references = collection.objects.in_bulk(refs)
-                for key, doc in iteritems(references):
+                for key, doc in references.iteritems():
                    object_map[(col_name, key)] = doc
            else:  # Generic reference: use the refs data to convert to document
-                if isinstance(doc_type, (ListField, DictField, MapField)):
+                if isinstance(doc_type, (ListField, DictField, MapField,)):
                    continue
                refs = [dbref for dbref in dbrefs
@@ -230,7 +203,7 @@ class DeReference(object):
            data = []
        else:
            is_list = False
-            iterator = iteritems(items)
+            iterator = items.iteritems()
            data = {}
        depth += 1
@@ -257,7 +230,7 @@ class DeReference(object):
            elif isinstance(v, (dict, list, tuple)) and depth <= self.max_depth:
                item_name = '%s.%s' % (name, k) if name else name
                data[k] = self._attach_objects(v, depth - 1, instance=instance, name=item_name)
-            elif isinstance(v, DBRef) and hasattr(v, 'id'):
+            elif hasattr(v, 'id'):
                data[k] = self.object_map.get((v.collection, v.id), v)
        if instance and name:
--- a/mongoengine/document.py
+++ b/mongoengine/document.py
@@ -5,7 +5,6 @@ from bson.dbref import DBRef
 import pymongo
 from pymongo.read_preferences import ReadPreference
 import six
 from six import iteritems
 from mongoengine import signals
 from mongoengine.base import (BaseDict, BaseDocument, BaseList,
@@ -13,12 +12,10 @@ from mongoengine.base import (BaseDict, BaseDocument, BaseList,
                              TopLevelDocumentMetaclass, get_document)
 from mongoengine.common import _import_class
 from mongoengine.connection import DEFAULT_CONNECTION_NAME, get_db
-from mongoengine.context_managers import (set_write_concern,
+from mongoengine.context_managers import switch_collection, switch_db
                                          switch_collection,
                                          switch_db)
 from mongoengine.errors import (InvalidDocumentError, InvalidQueryError,
                                SaveConditionError)
-from mongoengine.pymongo_support import list_collection_names
+from mongoengine.python_support import IS_PYMONGO_3
 from mongoengine.queryset import (NotUniqueError, OperationError,
                                  QuerySet, transform)
@@ -42,7 +39,7 @@ class InvalidCollectionError(Exception):
    pass
-class EmbeddedDocument(six.with_metaclass(DocumentMetaclass, BaseDocument)):
+class EmbeddedDocument(BaseDocument):
    """A :class:`~mongoengine.Document` that isn't stored in its own
    collection.  :class:`~mongoengine.EmbeddedDocument`\ s should be used as
    fields on :class:`~mongoengine.Document`\ s through the
@@ -61,12 +58,7 @@ class EmbeddedDocument(six.with_metaclass(DocumentMetaclass, BaseDocument)):
    # The __metaclass__ attribute is removed by 2to3 when running with Python3
    # my_metaclass is defined so that metaclass can be queried in Python 2 & 3
    my_metaclass = DocumentMetaclass
-
+    __metaclass__ = DocumentMetaclass
    # 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)
@@ -90,8 +82,14 @@ class EmbeddedDocument(six.with_metaclass(DocumentMetaclass, BaseDocument)):
        return data
    def save(self, *args, **kwargs):
        self._instance.save(*args, **kwargs)
-class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
+    def reload(self, *args, **kwargs):
        self._instance.reload(*args, **kwargs)
 class Document(BaseDocument):
    """The base class used for defining the structure and properties of
    collections of documents stored in MongoDB. Inherit from this class, and
    add fields as class attributes to define a document's structure.
@@ -146,6 +144,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
    # The __metaclass__ attribute is removed by 2to3 when running with Python3
    # my_metaclass is defined so that metaclass can be queried in Python 2 & 3
    my_metaclass = TopLevelDocumentMetaclass
    __metaclass__ = TopLevelDocumentMetaclass
    __slots__ = ('__objects',)
@@ -161,98 +160,57 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        """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:
            return super(BaseDocument, self).__hash__()
        return hash(self.pk)
    @classmethod
    def _get_db(cls):
        """Some Model using other db_alias"""
        return get_db(cls._meta.get('db_alias', DEFAULT_CONNECTION_NAME))
    @classmethod
    def _disconnect(cls):
        """Detach the Document class from the (cached) database collection"""
        cls._collection = None
    @classmethod
    def _get_collection(cls):
-        """Return the PyMongo collection corresponding to this document.
+        """Returns the collection for the document."""
-
+        # TODO: use new get_collection() with PyMongo3 ?
        Upon first call, this method:
        1. Initializes a :class:`~pymongo.collection.Collection` corresponding
           to this document.
        2. Creates indexes defined in this document's :attr:`meta` dictionary.
           This happens only if `auto_create_index` is True.
        """
        if not hasattr(cls, '_collection') or cls._collection is None:
-            # Get the collection, either capped or regular.
+            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'):
-                cls._collection = cls._get_capped_collection()
+                # Get max document limit and max byte size from meta
            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.
            # Also there is no need to ensure indexes on slave.
            db = cls._get_db()
            if cls._meta.get('auto_create_index', True) and\
                    db.client.is_primary:
                cls.ensure_indexes()
        return cls._collection
    @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')
-
+                # Round up to next 256 bytes as MongoDB would do it to avoid exception
        # 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
+                if collection_name in db.collection_names():
-        # (i.e. isn't capped or has different max/size), raise an error.
+                    cls._collection = db[collection_name]
-        if collection_name in list_collection_names(db, include_system_collections=True):
+                    # The collection already exists, check if its capped
-            collection = db[collection_name]
+                    # options match the specified capped options
-            options = collection.options()
+                    options = cls._collection.options()
-            if (
+                    if options.get('max') != max_documents or \
-                options.get('max') != max_documents or
+                            options.get('size') != max_size:
-                options.get('size') != max_size
+                        msg = (('Cannot create collection "%s" as a capped '
-            ):
+                                'collection as it already exists')
-                raise InvalidCollectionError(
+                               % cls._collection)
-                    'Cannot create collection "{}" as a capped '
+                        raise InvalidCollectionError(msg)
-                    'collection as it already exists'.format(cls._collection)
+                else:
-                )
+                    # Create the collection as a capped collection
            return collection
        # Create a new capped collection.
                    opts = {'capped': True, 'size': max_size}
                    if max_documents:
                        opts['max'] = max_documents
-
+                    cls._collection = db.create_collection(
-        return db.create_collection(collection_name, **opts)
+                        collection_name, **opts
                    )
            else:
                cls._collection = db[collection_name]
            if cls._meta.get('auto_create_index', True):
                cls.ensure_indexes()
        return cls._collection
    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, remove '_id' from the SON completely.
+        # 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']
@@ -289,9 +247,6 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        elif query[id_field] != self.pk:
            raise InvalidQueryError('Invalid document modify query: it must modify only this document.')
        # Need to add shard key to query, or you get an error
        query.update(self._object_key)
        updated = self._qs(**query).modify(new=True, **update)
        if updated is None:
            return False
@@ -312,7 +267,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, 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.
@@ -332,7 +287,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        :param save_condition: only perform save if matching record in db
            satisfies condition(s) (e.g. version number).
            Raises :class:`OperationError` if the conditions are not satisfied
-        :param signal_kwargs: (optional) kwargs dictionary to be passed to
+        :parm signal_kwargs: (optional) kwargs dictionary to be passed to
            the signal calls.
        .. versionchanged:: 0.5
@@ -358,26 +313,24 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        .. versionchanged:: 0.10.7
            Add signal_kwargs argument
        """
        signal_kwargs = signal_kwargs or {}
        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)
        if validate:
            self.validate(clean=clean)
        if write_concern is None:
-            write_concern = {}
+            write_concern = {'w': 1}
-        doc_id = self.to_mongo(fields=[self._meta['id_field']])
+        doc = self.to_mongo()
-        created = ('_id' not in doc_id or self._created or force_insert)
+
        created = ('_id' not in doc or self._created or force_insert)
        signals.pre_save_post_validation.send(self.__class__, document=self,
                                              created=created, **signal_kwargs)
        # it might be refreshed by the pre_save_post_validation hook, e.g., for etag generation
        doc = self.to_mongo()
        if self._meta.get('auto_create_index', True):
            self.ensure_indexes()
@@ -437,36 +390,24 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        Helper method, should only be used inside save().
        """
        collection = self._get_collection()
        with set_write_concern(collection, write_concern) as wc_collection:
            if force_insert:
                return wc_collection.insert_one(doc).inserted_id
            # insert_one will provoke UniqueError alongside save does not
            # therefore, it need to catch and call replace_one.
            if '_id' in doc:
                raw_object = wc_collection.find_one_and_replace(
                    {'_id': doc['_id']}, doc)
                if raw_object:
                    return doc['_id']
-            object_id = wc_collection.insert_one(doc).inserted_id
+        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['$unset'] = removals
        return update_doc
    def _save_update(self, doc, save_condition, write_concern):
        """Update an existing document.
@@ -492,15 +433,16 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
                val = val[ak]
            select_dict['.'.join(actual_key)] = val
-        update_doc = self._get_update_doc()
+        updates, removals = self._delta()
-        if update_doc:
+        update_query = {}
        if updates:
            update_query['$set'] = updates
        if removals:
            update_query['$unset'] = removals
        if updates or removals:
            upsert = save_condition is None
-            with set_write_concern(collection, write_concern) as wc_collection:
+            last_error = collection.update(select_dict, update_query,
-                last_error = wc_collection.update_one(
+                                           upsert=upsert, **write_concern)
                    select_dict,
                    update_doc,
                    upsert=upsert
                ).raw_result
            if not upsert and last_error['n'] == 0:
                raise SaveConditionError('Race condition preventing'
                                         ' document update detected')
@@ -544,7 +486,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
    @property
    def _qs(self):
-        """Return the default queryset corresponding to this document."""
+        """Return the queryset to use for updating / reloading / deletions."""
        if not hasattr(self, '__objects'):
            self.__objects = QuerySet(self, self._get_collection())
        return self.__objects
@@ -552,11 +494,9 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
    @property
    def _object_key(self):
        """Get the query dict that can be used to fetch this object from
-        the database.
+        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
-        Most of the time the dict is a simple PK lookup, but in case of
+        contain a more complex query.
        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())
@@ -593,11 +533,12 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        """Delete the :class:`~mongoengine.Document` from the database. This
        will only take effect if the document has been previously saved.
-        :param signal_kwargs: (optional) kwargs dictionary to be passed to
+        :parm signal_kwargs: (optional) kwargs dictionary to be passed to
            the signal calls.
        :param write_concern: Extra keyword arguments are passed down which
-            will be used as options for the resultant ``getLastError`` command.
+            will be used as options for the resultant
-            For example, ``save(..., w: 2, fsync: True)`` will
+            ``getLastError`` command.  For example,
            ``save(..., write_concern={w: 2, fsync: True}, ...)`` will
            wait until at least two servers have recorded the write and
            will force an fsync on the primary server.
@@ -609,7 +550,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        # Delete FileFields separately
        FileField = _import_class('FileField')
-        for name, field in iteritems(self._fields):
+        for name, field in self._fields.iteritems():
            if isinstance(field, FileField):
                getattr(self, name).delete()
@@ -718,6 +659,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
            obj = obj[0]
        else:
            raise self.DoesNotExist('Document does not exist')
        for field in obj._data:
            if not fields or field in fields:
                try:
@@ -725,7 +667,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
                except (KeyError, AttributeError):
                    try:
                        # If field is a special field, e.g. items is stored as _reserved_items,
-                        # a KeyError is thrown. So try to retrieve the field from _data
+                        # an KeyError is thrown. So try to retrieve the field from _data
                        setattr(self, field, self._reload(field, obj._data.get(field)))
                    except KeyError:
                        # If field is removed from the database while the object
@@ -733,9 +675,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
                        # i.e. obj.update(unset__field=1) followed by obj.reload()
                        delattr(self, field)
-        self._changed_fields = list(
+        self._changed_fields = obj._changed_fields
            set(self._changed_fields) - set(fields)
        ) if fields else obj._changed_fields
        self._created = False
        return self
@@ -794,13 +734,13 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        .. versionchanged:: 0.10.7
            :class:`OperationError` exception raised if no collection available
        """
-        coll_name = cls._get_collection_name()
+        col_name = cls._get_collection_name()
-        if not coll_name:
+        if not col_name:
            raise OperationError('Document %s has no collection defined '
                                 '(is it abstract ?)' % cls)
        cls._collection = None
        db = cls._get_db()
-        db.drop_collection(coll_name)
+        db.drop_collection(col_name)
    @classmethod
    def create_index(cls, keys, background=False, **kwargs):
@@ -815,13 +755,18 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        index_spec = index_spec.copy()
        fields = index_spec.pop('fields')
        drop_dups = kwargs.get('drop_dups', False)
-        if drop_dups:
+        if IS_PYMONGO_3 and drop_dups:
            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
        index_spec['background'] = background
        index_spec.update(kwargs)
        if IS_PYMONGO_3:
            return cls._get_collection().create_index(fields, **index_spec)
        else:
            return cls._get_collection().ensure_index(fields, **index_spec)
    @classmethod
    def ensure_index(cls, key_or_list, drop_dups=False, background=False,
@@ -836,9 +781,11 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        :param drop_dups: Was removed/ignored with MongoDB >2.7.5. The value
            will be removed if PyMongo3+ is used
        """
-        if drop_dups:
+        if IS_PYMONGO_3 and drop_dups:
            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})
        return cls.create_index(key_or_list, background=background, **kwargs)
    @classmethod
@@ -854,7 +801,7 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        drop_dups = cls._meta.get('index_drop_dups', False)
        index_opts = cls._meta.get('index_opts') or {}
        index_cls = cls._meta.get('index_cls', True)
-        if drop_dups:
+        if IS_PYMONGO_3 and drop_dups:
            msg = 'drop_dups is deprecated and is removed when using PyMongo 3+.'
            warnings.warn(msg, DeprecationWarning)
@@ -885,7 +832,11 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
                if 'cls' in opts:
                    del opts['cls']
                if IS_PYMONGO_3:
                    collection.create_index(fields, background=background, **opts)
                else:
                    collection.ensure_index(fields, background=background,
                                            drop_dups=drop_dups, **opts)
        # If _cls is being used (for polymorphism), it needs an index,
        # only if another index doesn't begin with _cls
@@ -896,8 +847,12 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
            if 'cls' in index_opts:
                del index_opts['cls']
            if IS_PYMONGO_3:
                collection.create_index('_cls', background=background,
                                        **index_opts)
            else:
                collection.ensure_index('_cls', background=background,
                                        **index_opts)
    @classmethod
    def list_indexes(cls):
@@ -966,16 +921,8 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        """
        required = cls.list_indexes()
-
+        existing = [info['key']
-        existing = []
+                    for info in cls._get_collection().index_information().values()]
        for info in cls._get_collection().index_information().values():
            if '_fts' in info['key'][0]:
                index_type = info['key'][0][1]
                text_index_fields = info.get('weights').keys()
                existing.append(
                    [(key, index_type) for key in text_index_fields])
            else:
                existing.append(info['key'])
        missing = [index for index in required if index not in existing]
        extra = [index for index in existing if index not in required]
@@ -992,10 +939,10 @@ class Document(six.with_metaclass(TopLevelDocumentMetaclass, BaseDocument)):
        return {'missing': missing, 'extra': extra}
-class DynamicDocument(six.with_metaclass(TopLevelDocumentMetaclass, Document)):
+class DynamicDocument(Document):
    """A Dynamic Document class allowing flexible, expandable and uncontrolled
    schemas.  As a :class:`~mongoengine.Document` subclass, acts in the same
-    way as an ordinary document but has expanded style properties.  Any data
+    way as an ordinary document but has expando style properties.  Any data
    passed or set against the :class:`~mongoengine.DynamicDocument` that is
    not a field is automatically converted into a
    :class:`~mongoengine.fields.DynamicField` and data can be attributed to that
@@ -1003,12 +950,13 @@ class DynamicDocument(six.with_metaclass(TopLevelDocumentMetaclass, Document)):
    .. note::
-        There is one caveat on Dynamic Documents: undeclared fields cannot start with `_`
+        There is one caveat on Dynamic Documents: fields cannot start with `_`
    """
    # The __metaclass__ attribute is removed by 2to3 when running with Python3
    # my_metaclass is defined so that metaclass can be queried in Python 2 & 3
    my_metaclass = TopLevelDocumentMetaclass
    __metaclass__ = TopLevelDocumentMetaclass
    _dynamic = True
@@ -1019,12 +967,11 @@ class DynamicDocument(six.with_metaclass(TopLevelDocumentMetaclass, Document)):
        field_name = args[0]
        if field_name in self._dynamic_fields:
            setattr(self, field_name, None)
            self._dynamic_fields[field_name].null = False
        else:
            super(DynamicDocument, self).__delattr__(*args, **kwargs)
-class DynamicEmbeddedDocument(six.with_metaclass(DocumentMetaclass, EmbeddedDocument)):
+class DynamicEmbeddedDocument(EmbeddedDocument):
    """A Dynamic Embedded Document class allowing flexible, expandable and
    uncontrolled schemas. See :class:`~mongoengine.DynamicDocument` for more
    information about dynamic documents.
@@ -1033,6 +980,7 @@ class DynamicEmbeddedDocument(six.with_metaclass(DocumentMetaclass, EmbeddedDocu
    # The __metaclass__ attribute is removed by 2to3 when running with Python3
    # my_metaclass is defined so that metaclass can be queried in Python 2 & 3
    my_metaclass = DocumentMetaclass
    __metaclass__ = DocumentMetaclass
    _dynamic = True
--- a/mongoengine/errors.py
+++ b/mongoengine/errors.py
@@ -1,12 +1,11 @@
 from collections import defaultdict
 import six
 from six import iteritems
 __all__ = ('NotRegistered', 'InvalidDocumentError', 'LookUpError',
           'DoesNotExist', 'MultipleObjectsReturned', 'InvalidQueryError',
           'OperationError', 'NotUniqueError', 'FieldDoesNotExist',
-           'ValidationError', 'SaveConditionError', 'DeprecatedError')
+           'ValidationError', 'SaveConditionError')
 class NotRegistered(Exception):
@@ -72,7 +71,6 @@ class ValidationError(AssertionError):
    _message = None
    def __init__(self, message='', **kwargs):
        super(ValidationError, self).__init__(message)
        self.errors = kwargs.get('errors', {})
        self.field_name = kwargs.get('field_name')
        self.message = message
@@ -110,8 +108,11 @@ class ValidationError(AssertionError):
        def build_dict(source):
            errors_dict = {}
            if not source:
                return errors_dict
            if isinstance(source, dict):
-                for field_name, error in iteritems(source):
+                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)
@@ -133,17 +134,12 @@ class ValidationError(AssertionError):
                value = ' '.join([generate_key(k) for k in value])
            elif isinstance(value, dict):
                value = ' '.join(
-                    [generate_key(v, k) for k, v in iteritems(value)])
+                    [generate_key(v, k) for k, v in value.iteritems()])
            results = '%s.%s' % (prefix, value) if prefix else value
            return results
        error_dict = defaultdict(list)
-        for k, v in iteritems(self.to_dict()):
+        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 iteritems(error_dict)])
+        return ' '.join(['%s: %s' % (k, v) for k, v in error_dict.iteritems()])
 class DeprecatedError(Exception):
    """Raise when a user uses a feature that has been Deprecated"""
    pass
--- a/mongoengine/fields.py
+++ b/mongoengine/fields.py
--- a/mongoengine/mongodb_support.py
+++ b/mongoengine/mongodb_support.py
@@ -1,19 +0,0 @@
 """
 Helper functions, constants, and types to aid with MongoDB version support
 """
 from mongoengine.connection import get_connection
 # Constant that can be used to compare the version retrieved with
 # get_mongodb_version()
 MONGODB_34 = (3, 4)
 MONGODB_36 = (3, 6)
 def get_mongodb_version():
    """Return the version of the connected mongoDB (first 2 digits)
    :return: tuple(int, int)
    """
    version_list = get_connection().server_info()['versionArray'][:2]     # e.g: (3, 2)
    return tuple(version_list)
--- a/mongoengine/pymongo_support.py
+++ b/mongoengine/pymongo_support.py
@@ -1,32 +0,0 @@
 """
 Helper functions, constants, and types to aid with PyMongo v2.7 - v3.x support.
 """
 import pymongo
 _PYMONGO_37 = (3, 7)
 PYMONGO_VERSION = tuple(pymongo.version_tuple[:2])
 IS_PYMONGO_GTE_37 = PYMONGO_VERSION >= _PYMONGO_37
 def count_documents(collection, filter):
    """Pymongo>3.7 deprecates count in favour of count_documents"""
    if IS_PYMONGO_GTE_37:
        return collection.count_documents(filter)
    else:
        count = collection.find(filter).count()
    return count
 def list_collection_names(db, include_system_collections=False):
    """Pymongo>3.7 deprecates collection_names in favour of list_collection_names"""
    if IS_PYMONGO_GTE_37:
        collections = db.list_collection_names()
    else:
        collections = db.collection_names()
    if not include_system_collections:
        collections = [c for c in collections if not c.startswith('system.')]
    return collections
--- a/mongoengine/python_support.py
+++ b/mongoengine/python_support.py
@@ -1,8 +1,17 @@
 """
-Helper functions, constants, and types to aid with Python v2.7 - v3.x support
+Helper functions, constants, and types to aid with Python v2.7 - v3.x and
 PyMongo v2.7 - v3.x support.
 """
 import pymongo
 import six
 if pymongo.version_tuple[0] < 3:
    IS_PYMONGO_3 = False
 else:
    IS_PYMONGO_3 = True
 # six.BytesIO resolves to StringIO.StringIO in Py2 and io.BytesIO in Py3.
 StringIO = six.BytesIO
@@ -14,10 +23,3 @@ if not six.PY3:
        pass
    else:
        StringIO = cStringIO.StringIO
 if six.PY3:
    from collections.abc import Hashable
 else:
    # raises DeprecationWarnings in Python >=3.7
    from collections import Hashable
--- a/mongoengine/queryset/base.py
+++ b/mongoengine/queryset/base.py
@@ -2,6 +2,7 @@ from __future__ import absolute_import
 import copy
 import itertools
 import operator
 import pprint
 import re
 import warnings
@@ -10,22 +11,24 @@ from bson import SON, json_util
 from bson.code import Code
 import pymongo
 import pymongo.errors
 from pymongo.collection import ReturnDocument
 from pymongo.common import validate_read_preference
 import six
 from six import iteritems
 from mongoengine import signals
 from mongoengine.base import get_document
 from mongoengine.common import _import_class
 from mongoengine.connection import get_db
-from mongoengine.context_managers import set_write_concern, switch_db
+from mongoengine.context_managers import switch_db
 from mongoengine.errors import (InvalidQueryError, LookUpError,
                                NotUniqueError, OperationError)
 from mongoengine.python_support import IS_PYMONGO_3
 from mongoengine.queryset import transform
 from mongoengine.queryset.field_list import QueryFieldList
 from mongoengine.queryset.visitor import Q, QNode
 if IS_PYMONGO_3:
    from pymongo.collection import ReturnDocument
 __all__ = ('BaseQuerySet', 'DO_NOTHING', 'NULLIFY', 'CASCADE', 'DENY', 'PULL')
@@ -36,6 +39,8 @@ CASCADE = 2
 DENY = 3
 PULL = 4
 RE_TYPE = type(re.compile(''))
 class BaseQuerySet(object):
    """A set of results returned from a query. Wraps a MongoDB cursor,
@@ -62,6 +67,7 @@ class BaseQuerySet(object):
        self._scalar = []
        self._none = False
        self._as_pymongo = False
        self._as_pymongo_coerce = False
        self._search_text = None
        # If inheritance is allowed, only return instances and instances of
@@ -73,7 +79,6 @@ class BaseQuerySet(object):
                self._initial_query = {
                    '_cls': {'$in': self._document._subclasses}}
            self._loaded_fields = QueryFieldList(always_include=['_cls'])
        self._cursor_obj = None
        self._limit = None
        self._skip = None
@@ -187,7 +192,7 @@ class BaseQuerySet(object):
                )
            if queryset._as_pymongo:
-                return queryset._cursor[key]
+                return queryset._get_as_pymongo(queryset._cursor[key])
            return queryset._document._from_son(
                queryset._cursor[key],
@@ -195,7 +200,7 @@ class BaseQuerySet(object):
                only_fields=self.only_fields
            )
-        raise TypeError('Provide a slice or an integer index')
+        raise AttributeError('Provide a slice or an integer index')
    def __iter__(self):
        raise NotImplementedError
@@ -205,16 +210,18 @@ class BaseQuerySet(object):
        queryset = self.order_by()
        return False if queryset.first() is None else True
    def __nonzero__(self):
        """Avoid to open all records in an if stmt in Py2."""
        return self._has_data()
    def __bool__(self):
        """Avoid to open all records in an if stmt in Py3."""
        return self._has_data()
    __nonzero__ = __bool__  # For Py2 support
    # Core functions
    def all(self):
-        """Returns a copy of the current QuerySet."""
+        """Returns all documents."""
        return self.__call__()
    def filter(self, *q_objs, **query):
@@ -263,13 +270,13 @@ class BaseQuerySet(object):
        queryset = queryset.filter(*q_objs, **query)
        try:
-            result = six.next(queryset)
+            result = queryset.next()
        except StopIteration:
            msg = ('%s matching query does not exist.'
                   % queryset._document._class_name)
            raise queryset._document.DoesNotExist(msg)
        try:
-            six.next(queryset)
+            queryset.next()
        except StopIteration:
            return result
@@ -336,7 +343,7 @@ class BaseQuerySet(object):
                       % str(self._document))
                raise OperationError(msg)
            if doc.pk and not doc._created:
-                msg = 'Some documents have ObjectIds, use doc.update() instead'
+                msg = 'Some documents have ObjectIds use doc.update() instead'
                raise OperationError(msg)
        signal_kwargs = signal_kwargs or {}
@@ -344,24 +351,11 @@ class BaseQuerySet(object):
                                     documents=docs, **signal_kwargs)
        raw = [doc.to_mongo() for doc in docs]
        with set_write_concern(self._collection, write_concern) as collection:
            insert_func = collection.insert_many
            if return_one:
                raw = raw[0]
                insert_func = collection.insert_one
        try:
-            inserted_result = insert_func(raw)
+            ids = self._collection.insert(raw, **write_concern)
            ids = [inserted_result.inserted_id] if return_one else inserted_result.inserted_ids
        except pymongo.errors.DuplicateKeyError as err:
            message = 'Could not save document (%s)'
            raise NotUniqueError(message % six.text_type(err))
        except pymongo.errors.BulkWriteError as err:
            # inserting documents that already have an _id field will
            # give huge performance debt or raise
            message = u'Document must not have _id value before bulk write (%s)'
            raise NotUniqueError(message % six.text_type(err))
        except pymongo.errors.OperationFailure as err:
            message = 'Could not save document (%s)'
            if re.match('^E1100[01] duplicate key', six.text_type(err)):
@@ -371,20 +365,18 @@ class BaseQuerySet(object):
                raise NotUniqueError(message % six.text_type(err))
            raise OperationError(message % six.text_type(err))
        # Apply inserted_ids to documents
        for doc, doc_id in zip(docs, ids):
            doc.pk = doc_id
        if not load_bulk:
            signals.post_bulk_insert.send(
                self._document, documents=docs, loaded=False, **signal_kwargs)
-            return ids[0] if return_one else ids
+            return return_one and ids[0] or ids
        documents = self.in_bulk(ids)
-        results = [documents.get(obj_id) for obj_id in ids]
+        results = []
        for obj_id in ids:
            results.append(documents.get(obj_id))
        signals.post_bulk_insert.send(
            self._document, documents=results, loaded=True, **signal_kwargs)
-        return results[0] if return_one else results
+        return return_one and results[0] or results
    def count(self, with_limit_and_skip=False):
        """Count the selected elements in the query.
@@ -393,11 +385,9 @@ class BaseQuerySet(object):
            :meth:`skip` that has been applied to this cursor into account when
            getting the count
        """
-        if self._limit == 0 and with_limit_and_skip is False or self._none:
+        if self._limit == 0 and with_limit_and_skip or self._none:
            return 0
-        count = self._cursor.count(with_limit_and_skip=with_limit_and_skip)
+        return self._cursor.count(with_limit_and_skip=with_limit_and_skip)
        self._cursor_obj = None
        return count
    def delete(self, write_concern=None, _from_doc_delete=False,
               cascade_refs=None):
@@ -481,10 +471,9 @@ class BaseQuerySet(object):
                    write_concern=write_concern,
                    **{'pull_all__%s' % field_name: self})
-        with set_write_concern(queryset._collection, write_concern) as collection:
+        result = queryset._collection.remove(queryset._query, **write_concern)
-            result = collection.delete_many(queryset._query)
+        if result:
-            if result.acknowledged:
+            return result.get('n')
                return result.deleted_count
    def update(self, upsert=False, multi=True, write_concern=None,
               full_result=False, **update):
@@ -498,12 +487,10 @@ class BaseQuerySet(object):
            ``save(..., write_concern={w: 2, fsync: True}, ...)`` will
            wait until at least two servers have recorded the write and
            will force an fsync on the primary server.
-        :param full_result: Return the associated ``pymongo.UpdateResult`` rather than just the number
+        :param full_result: Return the full result rather than just the number
-            updated items
+            updated.
        :param update: Django-style update keyword arguments
        :returns the number of updated documents (unless ``full_result`` is True)
        .. versionadded:: 0.2
        """
        if not update and not upsert:
@@ -524,15 +511,12 @@ class BaseQuerySet(object):
            else:
                update['$set'] = {'_cls': queryset._document._class_name}
        try:
-            with set_write_concern(queryset._collection, write_concern) as collection:
+            result = queryset._collection.update(query, update, multi=multi,
-                update_func = collection.update_one
+                                                 upsert=upsert, **write_concern)
                if multi:
                    update_func = collection.update_many
                result = update_func(query, update, upsert=upsert)
            if full_result:
                return result
-            elif result.raw_result:
+            elif result:
-                return result.raw_result['n']
+                return result['n']
        except pymongo.errors.DuplicateKeyError as err:
            raise NotUniqueError(u'Update failed (%s)' % six.text_type(err))
        except pymongo.errors.OperationFailure as err:
@@ -561,13 +545,13 @@ class BaseQuerySet(object):
                                    write_concern=write_concern,
                                    full_result=True, **update)
-        if atomic_update.raw_result['updatedExisting']:
+        if atomic_update['updatedExisting']:
            document = self.get()
        else:
-            document = self._document.objects.with_id(atomic_update.upserted_id)
+            document = self._document.objects.with_id(atomic_update['upserted'])
        return document
-    def update_one(self, upsert=False, write_concern=None, full_result=False, **update):
+    def update_one(self, upsert=False, write_concern=None, **update):
        """Perform an atomic update on the fields of the first document
        matched by the query.
@@ -578,19 +562,12 @@ class BaseQuerySet(object):
            ``save(..., write_concern={w: 2, fsync: True}, ...)`` will
            wait until at least two servers have recorded the write and
            will force an fsync on the primary server.
        :param full_result: Return the associated ``pymongo.UpdateResult`` rather than just the number
            updated items
        :param update: Django-style update keyword arguments
-            full_result
+
        :returns the number of updated documents (unless ``full_result`` is True)
        .. versionadded:: 0.2
        """
        return self.update(
-            upsert=upsert,
+            upsert=upsert, multi=False, write_concern=write_concern, **update)
            multi=False,
            write_concern=write_concern,
            full_result=full_result,
            **update)
    def modify(self, upsert=False, full_response=False, remove=False, new=False, **update):
        """Update and return the updated document.
@@ -625,11 +602,12 @@ class BaseQuerySet(object):
        queryset = self.clone()
        query = queryset._query
-        if not remove:
+        if not IS_PYMONGO_3 or not remove:
            update = transform.update(queryset._document, **update)
        sort = queryset._ordering
        try:
            if IS_PYMONGO_3:
                if full_response:
                    msg = 'With PyMongo 3+, it is not possible anymore to get the full response.'
                    warnings.warn(msg, DeprecationWarning)
@@ -644,6 +622,11 @@ class BaseQuerySet(object):
                    result = queryset._collection.find_one_and_update(
                        query, update, upsert=upsert, sort=sort, return_document=return_doc,
                        **self._cursor_args)
            else:
                result = queryset._collection.find_and_modify(
                    query, update, upsert=upsert, sort=sort, remove=remove, new=new,
                    full_response=full_response, **self._cursor_args)
        except pymongo.errors.DuplicateKeyError as err:
            raise NotUniqueError(u'Update failed (%s)' % err)
        except pymongo.errors.OperationFailure as err:
@@ -692,7 +675,7 @@ class BaseQuerySet(object):
                    self._document._from_son(doc, only_fields=self.only_fields))
        elif self._as_pymongo:
            for doc in docs:
-                doc_map[doc['_id']] = doc
+                doc_map[doc['_id']] = self._get_as_pymongo(doc)
        else:
            for doc in docs:
                doc_map[doc['_id']] = self._document._from_son(
@@ -709,9 +692,8 @@ class BaseQuerySet(object):
        return queryset
    def no_sub_classes(self):
-        """Filter for only the instances of this specific document.
+        """
-
+        Only return instances of this document and not any inherited documents
        Do NOT return any inherited documents.
        """
        if self._document._meta.get('allow_inheritance') is True:
            self._initial_query = {'_cls': self._document._class_name}
@@ -746,12 +728,11 @@ class BaseQuerySet(object):
                '%s is not a subclass of BaseQuerySet' % new_qs.__name__)
        copy_props = ('_mongo_query', '_initial_query', '_none', '_query_obj',
-                      '_where_clause', '_loaded_fields', '_ordering',
+                      '_where_clause', '_loaded_fields', '_ordering', '_snapshot',
-                      '_snapshot', '_timeout', '_class_check', '_slave_okay',
+                      '_timeout', '_class_check', '_slave_okay', '_read_preference',
-                      '_read_preference', '_iter', '_scalar', '_as_pymongo',
+                      '_iter', '_scalar', '_as_pymongo', '_as_pymongo_coerce',
                      '_limit', '_skip', '_hint', '_auto_dereference',
-                      '_search_text', 'only_fields', '_max_time_ms',
+                      '_search_text', 'only_fields', '_max_time_ms', '_comment')
                      '_comment', '_batch_size')
        for prop in copy_props:
            val = getattr(self, prop)
@@ -778,11 +759,10 @@ class BaseQuerySet(object):
        """Limit the number of returned documents to `n`. This may also be
        achieved using array-slicing syntax (e.g. ``User.objects[:5]``).
-        :param n: the maximum number of objects to return if n is greater than 0.
+        :param n: the maximum number of objects to return
        When 0 is passed, returns all the documents in the cursor
        """
        queryset = self.clone()
-        queryset._limit = n
+        queryset._limit = n if n != 0 else 1
        # If a cursor object has already been created, apply the limit to it.
        if queryset._cursor_obj:
@@ -959,8 +939,7 @@ class BaseQuerySet(object):
            posts = BlogPost.objects(...).fields(slice__comments=5)
-        :param kwargs: A set of keyword arguments identifying what to
+        :param kwargs: A set keywors arguments identifying what to include.
            include, exclude, or slice.
        .. versionadded:: 0.5
        """
@@ -980,9 +959,10 @@ class BaseQuerySet(object):
        # explicitly included, and then more complicated operators such as
        # $slice.
        def _sort_key(field_tuple):
-            _, value = field_tuple
+            key, value = field_tuple
-            if isinstance(value, int):
+            if isinstance(value, (int)):
                return value  # 0 for exclusion, 1 for inclusion
            else:
                return 2  # so that complex values appear last
        fields = sorted(cleaned_fields, key=_sort_key)
@@ -1012,15 +992,13 @@ class BaseQuerySet(object):
        return queryset
    def order_by(self, *keys):
-        """Order the :class:`~mongoengine.queryset.QuerySet` by the given keys.
+        """Order the :class:`~mongoengine.queryset.QuerySet` by the keys. The
-
+        order may be specified by prepending each of the keys by a + or a -.
-        The order may be specified by prepending each of the keys by a "+" or
+        Ascending order is assumed. If no keys are passed, existing ordering
-        a "-". Ascending order is assumed if there's no prefix.
+        is cleared instead.
        If no keys are passed, existing ordering is cleared instead.
        :param keys: fields to order the query results by; keys may be
-            prefixed with "+" or a "-" to determine the ordering direction.
+            prefixed with **+** or **-** to determine the ordering direction
        """
        queryset = self.clone()
@@ -1078,6 +1056,7 @@ class BaseQuerySet(object):
        ..versionchanged:: 0.5 - made chainable
        .. deprecated:: Ignored with PyMongo 3+
        """
        if IS_PYMONGO_3:
            msg = 'snapshot is deprecated as it has no impact when using PyMongo 3+.'
            warnings.warn(msg, DeprecationWarning)
        queryset = self.clone()
@@ -1085,7 +1064,7 @@ class BaseQuerySet(object):
        return queryset
    def timeout(self, enabled):
-        """Enable or disable the default mongod timeout when querying. (no_cursor_timeout option)
+        """Enable or disable the default mongod timeout when querying.
        :param enabled: whether or not the timeout is used
@@ -1103,6 +1082,7 @@ class BaseQuerySet(object):
        .. deprecated:: Ignored with PyMongo 3+
        """
        if IS_PYMONGO_3:
            msg = 'slave_okay is deprecated as it has no impact when using PyMongo 3+.'
            warnings.warn(msg, DeprecationWarning)
        queryset = self.clone()
@@ -1148,15 +1128,16 @@ class BaseQuerySet(object):
        """An alias for scalar"""
        return self.scalar(*fields)
-    def as_pymongo(self):
+    def as_pymongo(self, coerce_types=False):
        """Instead of returning Document instances, return raw values from
        pymongo.
-        This method is particularly useful if you don't need dereferencing
+        :param coerce_types: Field types (if applicable) would be use to
-        and care primarily about the speed of data retrieval.
+            coerce types.
        """
        queryset = self.clone()
        queryset._as_pymongo = True
        queryset._as_pymongo_coerce = coerce_types
        return queryset
    def max_time_ms(self, ms):
@@ -1194,21 +1175,13 @@ class BaseQuerySet(object):
            initial_pipeline.append({'$sort': dict(self._ordering)})
        if self._limit is not None:
-            # As per MongoDB Documentation (https://docs.mongodb.com/manual/reference/operator/aggregation/limit/),
+            initial_pipeline.append({'$limit': self._limit})
            # keeping limit stage right after sort stage is more efficient. But this leads to wrong set of documents
            # for a skip stage that might succeed these. So we need to maintain more documents in memory in such a
            # case (https://stackoverflow.com/a/24161461).
            initial_pipeline.append({'$limit': self._limit + (self._skip or 0)})
        if self._skip is not None:
            initial_pipeline.append({'$skip': self._skip})
        pipeline = initial_pipeline + list(pipeline)
        if self._read_preference is not None:
            return self._collection.with_options(read_preference=self._read_preference) \
                       .aggregate(pipeline, cursor={}, **kwargs)
        return self._collection.aggregate(pipeline, cursor={}, **kwargs)
    # JS functionality
@@ -1415,7 +1388,11 @@ class BaseQuerySet(object):
        if isinstance(field_instances[-1], ListField):
            pipeline.insert(1, {'$unwind': '$' + field})
-        result = tuple(self._document._get_collection().aggregate(pipeline))
+        result = self._document._get_collection().aggregate(pipeline)
        if IS_PYMONGO_3:
            result = tuple(result)
        else:
            result = result.get('result')
        if result:
            return result[0]['total']
@@ -1442,7 +1419,11 @@ class BaseQuerySet(object):
        if isinstance(field_instances[-1], ListField):
            pipeline.insert(1, {'$unwind': '$' + field})
-        result = tuple(self._document._get_collection().aggregate(pipeline))
+        result = self._document._get_collection().aggregate(pipeline)
        if IS_PYMONGO_3:
            result = tuple(result)
        else:
            result = result.get('result')
        if result:
            return result[0]['total']
        return 0
@@ -1476,16 +1457,16 @@ class BaseQuerySet(object):
    # Iterator helpers
-    def __next__(self):
+    def next(self):
        """Wrap the result in a :class:`~mongoengine.Document` object.
        """
        if self._limit == 0 or self._none:
            raise StopIteration
-        raw_doc = six.next(self._cursor)
+        raw_doc = self._cursor.next()
        if self._as_pymongo:
-            return raw_doc
+            return self._get_as_pymongo(raw_doc)
        doc = self._document._from_son(
            raw_doc, _auto_dereference=self._auto_dereference,
@@ -1496,8 +1477,6 @@ class BaseQuerySet(object):
        return doc
    next = __next__     # For Python2 support
    def rewind(self):
        """Rewind the cursor to its unevaluated state.
@@ -1517,6 +1496,17 @@ class BaseQuerySet(object):
    @property
    def _cursor_args(self):
        if not IS_PYMONGO_3:
            fields_name = 'fields'
            cursor_args = {
                'timeout': self._timeout,
                'snapshot': self._snapshot
            }
            if self._read_preference is not None:
                cursor_args['read_preference'] = self._read_preference
            else:
                cursor_args['slave_okay'] = self._slave_okay
        else:
            fields_name = 'projection'
            # snapshot is not handled at all by PyMongo 3+
            # TODO: evaluate similar possibilities using modifiers
@@ -1526,7 +1516,6 @@ class BaseQuerySet(object):
            cursor_args = {
                'no_cursor_timeout': not self._timeout
            }
        if self._loaded_fields:
            cursor_args[fields_name] = self._loaded_fields.as_dict()
@@ -1550,7 +1539,7 @@ class BaseQuerySet(object):
        # XXX In PyMongo 3+, we define the read preference on a collection
        # level, not a cursor level. Thus, we need to get a cloned collection
        # object using `with_options` first.
-        if self._read_preference is not None:
+        if IS_PYMONGO_3 and self._read_preference is not None:
            self._cursor_obj = self._collection\
                .with_options(read_preference=self._read_preference)\
                .find(self._query, **self._cursor_args)
@@ -1589,9 +1578,6 @@ class BaseQuerySet(object):
        if self._batch_size is not None:
            self._cursor_obj.batch_size(self._batch_size)
        if self._comment is not None:
            self._cursor_obj.comment(self._comment)
        return self._cursor_obj
    def __deepcopy__(self, memo):
@@ -1720,13 +1706,13 @@ class BaseQuerySet(object):
            }
        """
        total, data, types = self.exec_js(freq_func, field)
-        values = {types.get(k): int(v) for k, v in iteritems(data)}
+        values = {types.get(k): int(v) for k, v in data.iteritems()}
        if normalize:
            values = {k: float(v) / total for k, v in values.items()}
        frequencies = {}
-        for k, v in iteritems(values):
+        for k, v in values.iteritems():
            if isinstance(k, float):
                if int(k) == k:
                    k = int(k)
@@ -1736,33 +1722,25 @@ class BaseQuerySet(object):
        return frequencies
    def _fields_to_dbfields(self, fields):
-        """Translate fields' paths to their db equivalents."""
+        """Translate fields paths to its db equivalents"""
        ret = []
        subclasses = []
-        if self._document._meta['allow_inheritance']:
+        document = self._document
        if document._meta['allow_inheritance']:
            subclasses = [get_document(x)
-                          for x in self._document._subclasses][1:]
+                          for x in document._subclasses][1:]
        db_field_paths = []
        for field in fields:
            field_parts = field.split('.')
            try:
-                field = '.'.join(
+                field = '.'.join(f.db_field for f in
-                    f if isinstance(f, six.string_types) else f.db_field
+                                 document._lookup_field(field.split('.')))
-                    for f in self._document._lookup_field(field_parts)
+                ret.append(field)
                )
                db_field_paths.append(field)
            except LookUpError as err:
                found = False
                # If a field path wasn't found on the main document, go
                # through its subclasses and see if it exists on any of them.
                for subdoc in subclasses:
                    try:
-                        subfield = '.'.join(
+                        subfield = '.'.join(f.db_field for f in
-                            f if isinstance(f, six.string_types) else f.db_field
+                                            subdoc._lookup_field(field.split('.')))
-                            for f in subdoc._lookup_field(field_parts)
+                        ret.append(subfield)
                        )
                        db_field_paths.append(subfield)
                        found = True
                        break
                    except LookUpError:
@@ -1770,8 +1748,7 @@ class BaseQuerySet(object):
                if not found:
                    raise err
-
+        return ret
        return db_field_paths
    def _get_order_by(self, keys):
        """Given a list of MongoEngine-style sort keys, return a list
@@ -1822,6 +1799,60 @@ class BaseQuerySet(object):
        return tuple(data)
    def _get_as_pymongo(self, row):
        # Extract which fields paths we should follow if .fields(...) was
        # used. If not, handle all fields.
        if not getattr(self, '__as_pymongo_fields', None):
            self.__as_pymongo_fields = []
            for field in self._loaded_fields.fields - set(['_cls']):
                self.__as_pymongo_fields.append(field)
                while '.' in field:
                    field, _ = field.rsplit('.', 1)
                    self.__as_pymongo_fields.append(field)
        all_fields = not self.__as_pymongo_fields
        def clean(data, path=None):
            path = path or ''
            if isinstance(data, dict):
                new_data = {}
                for key, value in data.iteritems():
                    new_path = '%s.%s' % (path, key) if path else key
                    if all_fields:
                        include_field = True
                    elif self._loaded_fields.value == QueryFieldList.ONLY:
                        include_field = new_path in self.__as_pymongo_fields
                    else:
                        include_field = new_path not in self.__as_pymongo_fields
                    if include_field:
                        new_data[key] = clean(value, path=new_path)
                data = new_data
            elif isinstance(data, list):
                data = [clean(d, path=path) for d in data]
            else:
                if self._as_pymongo_coerce:
                    # If we need to coerce types, we need to determine the
                    # type of this field and use the corresponding
                    # .to_python(...)
                    EmbeddedDocumentField = _import_class('EmbeddedDocumentField')
                    obj = self._document
                    for chunk in path.split('.'):
                        obj = getattr(obj, chunk, None)
                        if obj is None:
                            break
                        elif isinstance(obj, EmbeddedDocumentField):
                            obj = obj.document_type
                    if obj and data is not None:
                        data = obj.to_python(data)
            return data
        return clean(row)
    def _sub_js_fields(self, code):
        """When fields are specified with [~fieldname] syntax, where
        *fieldname* is the Python name of a field, *fieldname* will be
@@ -1843,8 +1874,8 @@ class BaseQuerySet(object):
            # Substitute the correct name for the field into the javascript
            return '.'.join([f.db_field for f in fields])
-        code = re.sub(r'\[\s*~([A-z_][A-z_0-9.]+?)\s*\]', field_sub, code)
+        code = re.sub(u'\[\s*~([A-z_][A-z_0-9.]+?)\s*\]', field_sub, code)
-        code = re.sub(r'\{\{\s*~([A-z_][A-z_0-9.]+?)\s*\}\}', field_path_sub,
+        code = re.sub(u'\{\{\s*~([A-z_][A-z_0-9.]+?)\s*\}\}', field_path_sub,
                      code)
        return code
--- a/mongoengine/queryset/field_list.py
+++ b/mongoengine/queryset/field_list.py
@@ -63,11 +63,9 @@ class QueryFieldList(object):
            self._only_called = True
        return self
-    def __bool__(self):
+    def __nonzero__(self):
        return bool(self.fields)
    __nonzero__ = __bool__  # For Py2 support
    def as_dict(self):
        field_list = {field: self.value for field in self.fields}
        if self.slice:
--- a/mongoengine/queryset/manager.py
+++ b/mongoengine/queryset/manager.py
@@ -36,7 +36,7 @@ class QuerySetManager(object):
        queryset_class = owner._meta.get('queryset_class', self.default)
        queryset = queryset_class(owner, owner._get_collection())
        if self.get_queryset:
-            arg_count = self.get_queryset.__code__.co_argcount
+            arg_count = self.get_queryset.func_code.co_argcount
            if arg_count == 1:
                queryset = self.get_queryset(queryset)
            elif arg_count == 2:
--- a/mongoengine/queryset/queryset.py
+++ b/mongoengine/queryset/queryset.py
@@ -1,5 +1,3 @@
 import six
 from mongoengine.errors import OperationError
 from mongoengine.queryset.base import (BaseQuerySet, CASCADE, DENY, DO_NOTHING,
                                       NULLIFY, PULL)
@@ -89,10 +87,10 @@ class QuerySet(BaseQuerySet):
                yield self._result_cache[pos]
                pos += 1
-            # return if we already established there were no more
+            # Raise StopIteration if we already established there were no more
            # docs in the db cursor.
            if not self._has_more:
-                return
+                raise StopIteration
            # Otherwise, populate more of the cache and repeat.
            if len(self._result_cache) <= pos:
@@ -114,8 +112,8 @@ class QuerySet(BaseQuerySet):
        # Pull in ITER_CHUNK_SIZE docs from the database and store them in
        # the result cache.
        try:
-            for _ in six.moves.range(ITER_CHUNK_SIZE):
+            for _ in xrange(ITER_CHUNK_SIZE):
-                self._result_cache.append(six.next(self))
+                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
@@ -168,9 +166,9 @@ class QuerySetNoCache(BaseQuerySet):
            return '.. queryset mid-iteration ..'
        data = []
-        for _ in six.moves.range(REPR_OUTPUT_SIZE + 1):
+        for _ in xrange(REPR_OUTPUT_SIZE + 1):
            try:
-                data.append(six.next(self))
+                data.append(self.next())
            except StopIteration:
                break
@@ -186,3 +184,10 @@ class QuerySetNoCache(BaseQuerySet):
            queryset = self.clone()
        queryset.rewind()
        return queryset
 class QuerySetNoDeRef(QuerySet):
    """Special no_dereference QuerySet"""
    def __dereference(items, max_depth=1, instance=None, name=None):
        return items
--- a/mongoengine/queryset/transform.py
+++ b/mongoengine/queryset/transform.py
@@ -4,11 +4,12 @@ from bson import ObjectId, SON
 from bson.dbref import DBRef
 import pymongo
 import six
 from six import iteritems
 from mongoengine.base import UPDATE_OPERATORS
 from mongoengine.common import _import_class
 from mongoengine.connection import get_connection
 from mongoengine.errors import InvalidQueryError
 from mongoengine.python_support import IS_PYMONGO_3
 __all__ = ('query', 'update')
@@ -86,14 +87,35 @@ 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, six.string_types):
                    if (op in STRING_OPERATORS and
                            isinstance(value, six.string_types)):
                        StringField = _import_class('StringField')
                        value = StringField.prepare_query_value(op, value)
                    else:
                        value = field
                else:
                    value = field.prepare_query_value(op, value)
                    if isinstance(field, CachedReferenceField) and value:
                        value = value['_id']
            elif op in ('in', 'nin', 'all', 'near') and not isinstance(value, dict):
-                # Raise an error if the in/nin/all/near param is not iterable.
+                # Raise an error if the in/nin/all/near param is not iterable. We need a
-                value = _prepare_query_for_iterable(field, op, 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:
@@ -138,14 +160,14 @@ def query(_doc_cls=None, **kwargs):
        if op is None or key not in mongo_query:
            mongo_query[key] = value
        elif key in mongo_query:
-            if isinstance(mongo_query[key], dict) and isinstance(value, dict):
+            if isinstance(mongo_query[key], dict):
                mongo_query[key].update(value)
                # $max/minDistance needs to come last - convert to SON
                value_dict = mongo_query[key]
                if ('$maxDistance' in value_dict or '$minDistance' in value_dict) and \
                        ('$near' in value_dict or '$nearSphere' in value_dict):
                    value_son = SON()
-                    for k, v in iteritems(value_dict):
+                    for k, v in value_dict.iteritems():
                        if k == '$maxDistance' or k == '$minDistance':
                            continue
                        value_son[k] = v
@@ -153,14 +175,16 @@ def query(_doc_cls=None, **kwargs):
                    # PyMongo 3+ and MongoDB < 2.6
                    near_embedded = False
                    for near_op in ('$near', '$nearSphere'):
-                        if isinstance(value_dict.get(near_op), dict):
+                        if isinstance(value_dict.get(near_op), dict) and (
                                IS_PYMONGO_3 or get_connection().max_wire_version > 1):
                            value_son[near_op] = SON(value_son[near_op])
                            if '$maxDistance' in value_dict:
-                                value_son[near_op]['$maxDistance'] = value_dict['$maxDistance']
+                                value_son[near_op][
                                    '$maxDistance'] = value_dict['$maxDistance']
                            if '$minDistance' in value_dict:
-                                value_son[near_op]['$minDistance'] = value_dict['$minDistance']
+                                value_son[near_op][
                                    '$minDistance'] = value_dict['$minDistance']
                            near_embedded = True
                    if not near_embedded:
                        if '$maxDistance' in value_dict:
                            value_son['$maxDistance'] = value_dict['$maxDistance']
@@ -190,37 +214,30 @@ def update(_doc_cls=None, **update):
    format.
    """
    mongo_update = {}
    for key, value in update.items():
        if key == '__raw__':
            mongo_update.update(value)
            continue
        parts = key.split('__')
        # 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
        op = None
        if parts[0] in UPDATE_OPERATORS:
            op = parts.pop(0)
            # Convert Pythonic names to Mongo equivalents
-            operator_map = {
+            if op in ('push_all', 'pull_all'):
-                'push_all': 'pushAll',
+                op = op.replace('_all', 'All')
-                'pull_all': 'pullAll',
+            elif op == 'dec':
                'dec': 'inc',
                'add_to_set': 'addToSet',
                'set_on_insert': 'setOnInsert'
            }
            if op == 'dec':
                # Support decrement by flipping a positive value's sign
                # and using 'inc'
                op = 'inc'
                value = -value
-            # If the operator doesn't found from operator map, the op value
+            elif op == 'add_to_set':
-            # will stay unchanged
+                op = 'addToSet'
-            op = operator_map.get(op, op)
+            elif op == 'set_on_insert':
                op = 'setOnInsert'
        match = None
        if parts[-1] in COMPARISON_OPERATORS:
@@ -267,15 +284,7 @@ def update(_doc_cls=None, **update):
            if isinstance(field, GeoJsonBaseField):
                value = field.to_mongo(value)
-            if op == 'pull':
+            if op in (None, 'set', 'push', 'pull'):
                if field.required or value is not None:
                    if match in ('in', 'nin') and not isinstance(value, dict):
                        value = _prepare_query_for_iterable(field, op, value)
                    else:
                        value = field.prepare_query_value(op, value)
            elif op == 'push' and isinstance(value, (list, tuple, set)):
                value = [field.prepare_query_value(op, v) for v in value]
            elif op in (None, 'set', 'push'):
                if field.required or value is not None:
                    value = field.prepare_query_value(op, value)
            elif op in ('pushAll', 'pullAll'):
@@ -287,8 +296,6 @@ def update(_doc_cls=None, **update):
                    value = field.prepare_query_value(op, value)
            elif op == 'unset':
                value = 1
            elif op == 'inc':
                value = field.prepare_query_value(op, value)
        if match:
            match = '$' + match
@@ -296,6 +303,10 @@ def update(_doc_cls=None, **update):
        key = '.'.join(parts)
        if not op:
            raise InvalidQueryError('Updates must supply an operation '
                                    'eg: set__FIELD=value')
        if 'pull' in op and '.' in key:
            # Dot operators don't work on pull operations
            # unless they point to a list field
@@ -308,17 +319,11 @@ def update(_doc_cls=None, **update):
            field_classes = [c.__class__ for c in cleaned_fields]
            field_classes.reverse()
            ListField = _import_class('ListField')
            EmbeddedDocumentListField = _import_class('EmbeddedDocumentListField')
            if ListField in field_classes or EmbeddedDocumentListField in field_classes:
                # Join all fields via dot notation to the last ListField or EmbeddedDocumentListField
                # Then process as normal
            if ListField in field_classes:
-                    _check_field = ListField
+                # Join all fields via dot notation to the last ListField
-                else:
+                # Then process as normal
                    _check_field = EmbeddedDocumentListField
                last_listField = len(
-                    cleaned_fields) - field_classes.index(_check_field)
+                    cleaned_fields) - field_classes.index(ListField)
                key = '.'.join(parts[:last_listField])
                parts = parts[last_listField:]
                parts.insert(0, key)
@@ -328,26 +333,10 @@ def update(_doc_cls=None, **update):
                value = {key: value}
        elif op == 'addToSet' and isinstance(value, list):
            value = {key: {'$each': value}}
        elif op in ('push', 'pushAll'):
            if parts[-1].isdigit():
                key = '.'.join(parts[0:-1])
                position = int(parts[-1])
                # $position expects an iterable. If pushing a single value,
                # wrap it in a list.
                if not isinstance(value, (set, tuple, list)):
                    value = [value]
                value = {key: {'$each': value, '$position': position}}
            else:
                if op == 'pushAll':
                    op = 'push'  # convert to non-deprecated keyword
                    if not isinstance(value, (set, tuple, list)):
                        value = [value]
                    value = {key: {'$each': value}}
                else:
                    value = {key: value}
        else:
            value = {key: value}
        key = '$' + op
        if key not in mongo_update:
            mongo_update[key] = value
        elif key in mongo_update and isinstance(mongo_update[key], dict):
@@ -414,6 +403,7 @@ def _infer_geometry(value):
                                '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]
@@ -435,22 +425,3 @@ def _infer_geometry(value):
    raise InvalidQueryError('Invalid $geometry data. Can be either a '
                            'dictionary or (nested) lists of coordinate(s)')
 def _prepare_query_for_iterable(field, op, value):
    # We need a 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]).")
    if not hasattr(value, '__iter__'):
        raise TypeError("The `in`, `nin`, `all`, or "
                        "`near`-operators must be applied to an "
                        "iterable (e.g. a list).")
    return [field.prepare_query_value(op, v) for v in value]
--- a/mongoengine/queryset/visitor.py
+++ b/mongoengine/queryset/visitor.py
@@ -3,7 +3,7 @@ import copy
 from mongoengine.errors import InvalidQueryError
 from mongoengine.queryset import transform
-__all__ = ('Q', 'QNode')
+__all__ = ('Q',)
 class QNodeVisitor(object):
@@ -131,10 +131,6 @@ class QCombination(QNode):
            else:
                self.children.append(node)
    def __repr__(self):
        op = ' & ' if self.operation is self.AND else ' | '
        return '(%s)' % op.join([repr(node) for node in self.children])
    def accept(self, visitor):
        for i in range(len(self.children)):
            if isinstance(self.children[i], QNode):
@@ -155,9 +151,6 @@ class Q(QNode):
    def __init__(self, **query):
        self.query = query
    def __repr__(self):
        return 'Q(**%s)' % repr(self.query)
    def accept(self, visitor):
        return visitor.visit_query(self)
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,5 @@
 nose
-pymongo>=3.4
+pymongo>=2.7.1
 six==1.10.0
 flake8
 flake8-import-order
 Sphinx==1.5.5
 sphinx-rtd-theme==0.2.4
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,11 +1,11 @@
 [nosetests]
 verbosity=2
 detailed-errors=1
-#tests=tests
+tests=tests
 cover-package=mongoengine
 [flake8]
-ignore=E501,F401,F403,F405,I201,I202,W504, W605
+ignore=E501,F401,F403,F405,I201
 exclude=build,dist,docs,venv,venv3,.tox,.eggs,tests
 max-complexity=47
 application-import-names=mongoengine,tests
--- a/setup.py
+++ b/setup.py
@@ -44,8 +44,9 @@ CLASSIFIERS = [
    "Programming Language :: Python :: 2",
    "Programming Language :: Python :: 2.7",
    "Programming Language :: Python :: 3",
    "Programming Language :: Python :: 3.3",
    "Programming Language :: Python :: 3.4",
    "Programming Language :: Python :: 3.5",
    "Programming Language :: Python :: 3.6",
    "Programming Language :: Python :: Implementation :: CPython",
    "Programming Language :: Python :: Implementation :: PyPy",
    'Topic :: Database',
@@ -69,9 +70,9 @@ setup(
    name='mongoengine',
    version=VERSION,
    author='Harry Marr',
-    author_email='harry.marr@gmail.com',
+    author_email='harry.marr@{nospam}gmail.com',
-    maintainer="Stefan Wojcik",
+    maintainer="Ross Lawley",
-    maintainer_email="wojcikstefan@gmail.com",
+    maintainer_email="ross.lawley@{nospam}gmail.com",
    url='http://mongoengine.org/',
    download_url='https://github.com/MongoEngine/mongoengine/tarball/master',
    license='MIT',
@@ -80,7 +81,7 @@ setup(
    long_description=LONG_DESCRIPTION,
    platforms=['any'],
    classifiers=CLASSIFIERS,
-    install_requires=['pymongo>=3.4', 'six'],
+    install_requires=['pymongo>=2.7.1', 'six'],
    test_suite='nose.collector',
    **extra_opts
 )
--- a/tests/init.py
+++ b/tests/init.py
@@ -1,4 +1,4 @@
-from .all_warnings import AllWarnings
+from all_warnings import AllWarnings
-from .document import *
+from document import *
-from .queryset import *
+from queryset import *
-from .fields import *
+from fields import *
--- a/tests/document/init.py
+++ b/tests/document/init.py
@@ -1,13 +1,13 @@
 import unittest
-from .class_methods import *
+from class_methods import *
-from .delta import *
+from delta import *
-from .dynamic import *
+from dynamic import *
-from .indexes import *
+from indexes import *
-from .inheritance import *
+from inheritance import *
-from .instance import *
+from instance import *
-from .json_serialisation import *
+from json_serialisation import *
-from .validation import *
+from validation import *
 if __name__ == '__main__':
    unittest.main()
--- a/tests/document/class_methods.py
+++ b/tests/document/class_methods.py
@@ -2,7 +2,6 @@
 import unittest
 from mongoengine import *
 from mongoengine.pymongo_support import list_collection_names
 from mongoengine.queryset import NULLIFY, PULL
 from mongoengine.connection import get_db
@@ -27,7 +26,9 @@ class ClassMethodsTest(unittest.TestCase):
        self.Person = Person
    def tearDown(self):
-        for collection in list_collection_names(self.db):
+        for collection in self.db.collection_names():
            if 'system.' in collection:
                continue
            self.db.drop_collection(collection)
    def test_definition(self):
@@ -64,10 +65,10 @@ class ClassMethodsTest(unittest.TestCase):
        """
        collection_name = 'person'
        self.Person(name='Test').save()
-        self.assertIn(collection_name, list_collection_names(self.db))
+        self.assertTrue(collection_name in self.db.collection_names())
        self.Person.drop_collection()
-        self.assertNotIn(collection_name, list_collection_names(self.db))
+        self.assertFalse(collection_name in self.db.collection_names())
    def test_register_delete_rule(self):
        """Ensure that register delete rule adds a delete rule to the document
@@ -100,16 +101,16 @@ class ClassMethodsTest(unittest.TestCase):
        BlogPost.drop_collection()
        BlogPost.ensure_indexes()
-        self.assertEqual(BlogPost.compare_indexes(), {'missing': [], 'extra': []})
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
        BlogPost.ensure_index(['author', 'description'])
-        self.assertEqual(BlogPost.compare_indexes(), {'missing': [], 'extra': [[('author', 1), ('description', 1)]]})
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [[('author', 1), ('description', 1)]] })
        BlogPost._get_collection().drop_index('author_1_description_1')
-        self.assertEqual(BlogPost.compare_indexes(), {'missing': [], 'extra': []})
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
        BlogPost._get_collection().drop_index('author_1_title_1')
-        self.assertEqual(BlogPost.compare_indexes(), {'missing': [[('author', 1), ('title', 1)]], 'extra': []})
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [[('author', 1), ('title', 1)]], 'extra': [] })
    def test_compare_indexes_inheritance(self):
        """ Ensure that the indexes are properly created and that
@@ -138,16 +139,16 @@ class ClassMethodsTest(unittest.TestCase):
        BlogPost.ensure_indexes()
        BlogPostWithTags.ensure_indexes()
-        self.assertEqual(BlogPost.compare_indexes(), {'missing': [], 'extra': []})
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
        BlogPostWithTags.ensure_index(['author', 'tag_list'])
-        self.assertEqual(BlogPost.compare_indexes(), {'missing': [], 'extra': [[('_cls', 1), ('author', 1), ('tag_list', 1)]]})
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [[('_cls', 1), ('author', 1), ('tag_list', 1)]] })
        BlogPostWithTags._get_collection().drop_index('_cls_1_author_1_tag_list_1')
-        self.assertEqual(BlogPost.compare_indexes(), {'missing': [], 'extra': []})
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
        BlogPostWithTags._get_collection().drop_index('_cls_1_author_1_tags_1')
-        self.assertEqual(BlogPost.compare_indexes(), {'missing': [[('_cls', 1), ('author', 1), ('tags', 1)]], 'extra': []})
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [[('_cls', 1), ('author', 1), ('tags', 1)]], 'extra': [] })
    def test_compare_indexes_multiple_subclasses(self):
        """ Ensure that compare_indexes behaves correctly if called from a
@@ -182,28 +183,9 @@ class ClassMethodsTest(unittest.TestCase):
        BlogPostWithTags.ensure_indexes()
        BlogPostWithCustomField.ensure_indexes()
-        self.assertEqual(BlogPost.compare_indexes(), {'missing': [], 'extra': []})
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
-        self.assertEqual(BlogPostWithTags.compare_indexes(), {'missing': [], 'extra': []})
+        self.assertEqual(BlogPostWithTags.compare_indexes(), { 'missing': [], 'extra': [] })
-        self.assertEqual(BlogPostWithCustomField.compare_indexes(), {'missing': [], 'extra': []})
+        self.assertEqual(BlogPostWithCustomField.compare_indexes(), { 'missing': [], 'extra': [] })
    def test_compare_indexes_for_text_indexes(self):
        """ Ensure that compare_indexes behaves correctly for text indexes """
        class Doc(Document):
            a = StringField()
            b = StringField()
            meta = {'indexes': [
                {'fields': ['$a', "$b"],
                 'default_language': 'english',
                 'weights': {'a': 10, 'b': 2}
                }
            ]}
        Doc.drop_collection()
        Doc.ensure_indexes()
        actual = Doc.compare_indexes()
        expected = {'missing': [], 'extra': []}
        self.assertEqual(actual, expected)
    def test_list_indexes_inheritance(self):
        """ ensure that all of the indexes are listed regardless of the super-
@@ -337,7 +319,7 @@ class ClassMethodsTest(unittest.TestCase):
            meta = {'collection': collection_name}
        Person(name="Test User").save()
-        self.assertIn(collection_name, list_collection_names(self.db))
+        self.assertTrue(collection_name in self.db.collection_names())
        user_obj = self.db[collection_name].find_one()
        self.assertEqual(user_obj['name'], "Test User")
@@ -346,7 +328,7 @@ class ClassMethodsTest(unittest.TestCase):
        self.assertEqual(user_obj.name, "Test User")
        Person.drop_collection()
-        self.assertNotIn(collection_name, list_collection_names(self.db))
+        self.assertFalse(collection_name in self.db.collection_names())
    def test_collection_name_and_primary(self):
        """Ensure that a collection with a specified name may be used.
--- a/tests/document/delta.py
+++ b/tests/document/delta.py
@@ -3,14 +3,16 @@ import unittest
 from bson import SON
 from mongoengine import *
-from mongoengine.pymongo_support import list_collection_names
+from mongoengine.connection import get_db
-from tests.utils import MongoDBTestCase
+
 __all__ = ("DeltaTest",)
-class DeltaTest(MongoDBTestCase):
+class DeltaTest(unittest.TestCase):
    def setUp(self):
-        super(DeltaTest, self).setUp()
+        connect(db='mongoenginetest')
        self.db = get_db()
        class Person(Document):
            name = StringField()
@@ -23,7 +25,9 @@ class DeltaTest(MongoDBTestCase):
        self.Person = Person
    def tearDown(self):
-        for collection in list_collection_names(self.db):
+        for collection in self.db.collection_names():
            if 'system.' in collection:
                continue
            self.db.drop_collection(collection)
    def test_delta(self):
@@ -690,7 +694,7 @@ class DeltaTest(MongoDBTestCase):
        organization.employees.append(person)
        updates, removals = organization._delta()
        self.assertEqual({}, removals)
-        self.assertIn('employees', updates)
+        self.assertTrue('employees' in updates)
    def test_delta_with_dbref_false(self):
        person, organization, employee = self.circular_reference_deltas_2(Document, Document, False)
@@ -705,7 +709,7 @@ class DeltaTest(MongoDBTestCase):
        organization.employees.append(person)
        updates, removals = organization._delta()
        self.assertEqual({}, removals)
-        self.assertIn('employees', updates)
+        self.assertTrue('employees' in updates)
    def test_nested_nested_fields_mark_as_changed(self):
        class EmbeddedDoc(EmbeddedDocument):
@@ -859,6 +863,5 @@ class DeltaTest(MongoDBTestCase):
        self.assertEqual('oops', delta[0]["users.007.rolist"][0]["type"])
        self.assertEqual(uinfo.id, delta[0]["users.007.info"])
 if __name__ == '__main__':
    unittest.main()
--- a/tests/document/dynamic.py
+++ b/tests/document/dynamic.py
@@ -1,15 +1,16 @@
 import unittest
 from mongoengine import *
-from tests.utils import MongoDBTestCase
+from mongoengine.connection import get_db
-__all__ = ("TestDynamicDocument", )
+__all__ = ("DynamicTest", )
-class TestDynamicDocument(MongoDBTestCase):
+class DynamicTest(unittest.TestCase):
    def setUp(self):
-        super(TestDynamicDocument, self).setUp()
+        connect(db='mongoenginetest')
        self.db = get_db()
        class Person(DynamicDocument):
            name = StringField()
@@ -97,72 +98,6 @@ class TestDynamicDocument(MongoDBTestCase):
        self.assertEqual(len(p._data), 4)
        self.assertEqual(sorted(p._data.keys()), ['_cls', 'age', 'id', 'name'])
    def test_fields_without_underscore(self):
        """Ensure we can query dynamic fields"""
        Person = self.Person
        p = self.Person(name='Dean')
        p.save()
        raw_p = Person.objects.as_pymongo().get(id=p.id)
        self.assertEqual(
            raw_p,
            {
                '_cls': u'Person',
                '_id': p.id,
                'name': u'Dean'
             }
        )
        p.name = 'OldDean'
        p.newattr = 'garbage'
        p.save()
        raw_p = Person.objects.as_pymongo().get(id=p.id)
        self.assertEqual(
            raw_p,
            {
                '_cls': u'Person',
                '_id': p.id,
                'name': 'OldDean',
                'newattr': u'garbage'
            }
        )
    def test_fields_containing_underscore(self):
        """Ensure we can query dynamic fields"""
        class WeirdPerson(DynamicDocument):
            name = StringField()
            _name = StringField()
        WeirdPerson.drop_collection()
        p = WeirdPerson(name='Dean', _name='Dean')
        p.save()
        raw_p = WeirdPerson.objects.as_pymongo().get(id=p.id)
        self.assertEqual(
            raw_p,
            {
                '_id': p.id,
                '_name': u'Dean',
                'name': u'Dean'
            }
        )
        p.name = 'OldDean'
        p._name = 'NewDean'
        p._newattr1 = 'garbage'    # Unknown fields won't be added
        p.save()
        raw_p = WeirdPerson.objects.as_pymongo().get(id=p.id)
        self.assertEqual(
            raw_p,
            {
                '_id': p.id,
                '_name': u'NewDean',
                'name': u'OldDean',
            }
        )
    def test_dynamic_document_queries(self):
        """Ensure we can query dynamic fields"""
        p = self.Person()
@@ -239,8 +174,8 @@ class TestDynamicDocument(MongoDBTestCase):
        Employee.drop_collection()
-        self.assertIn('name', Employee._fields)
+        self.assertTrue('name' in Employee._fields)
-        self.assertIn('salary', Employee._fields)
+        self.assertTrue('salary' in Employee._fields)
        self.assertEqual(Employee._get_collection_name(),
                         self.Person._get_collection_name())
@@ -254,7 +189,7 @@ class TestDynamicDocument(MongoDBTestCase):
        self.assertEqual(1, Employee.objects(age=20).count())
        joe_bloggs = self.Person.objects.first()
-        self.assertIsInstance(joe_bloggs, Employee)
+        self.assertTrue(isinstance(joe_bloggs, Employee))
    def test_embedded_dynamic_document(self):
        """Test dynamic embedded documents"""
@@ -434,6 +369,5 @@ class TestDynamicDocument(MongoDBTestCase):
        person.save()
        self.assertEqual(Person.objects.first().age, 35)
 if __name__ == '__main__':
    unittest.main()
--- a/tests/document/indexes.py
+++ b/tests/document/indexes.py
@@ -1,15 +1,16 @@
 # -*- coding: utf-8 -*-
 import unittest
-from datetime import datetime
+import sys
 from nose.plugins.skip import SkipTest
-from pymongo.errors import OperationFailure
+from datetime import datetime
 import pymongo
 from six import iteritems
 from mongoengine import *
 from mongoengine.connection import get_db
 from tests.utils import get_mongodb_version, needs_mongodb_v26
 __all__ = ("IndexesTest", )
@@ -67,9 +68,9 @@ class IndexesTest(unittest.TestCase):
        info = BlogPost.objects._collection.index_information()
        # _id, '-date', 'tags', ('cat', 'date')
        self.assertEqual(len(info), 4)
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
        for expected in expected_specs:
-            self.assertIn(expected['fields'], info)
+            self.assertTrue(expected['fields'] in info)
    def _index_test_inheritance(self, InheritFrom):
@@ -99,9 +100,9 @@ class IndexesTest(unittest.TestCase):
        # the indices on -date and tags will both contain
        # _cls as first element in the key
        self.assertEqual(len(info), 4)
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
        for expected in expected_specs:
-            self.assertIn(expected['fields'], info)
+            self.assertTrue(expected['fields'] in info)
        class ExtendedBlogPost(BlogPost):
            title = StringField()
@@ -114,9 +115,9 @@ class IndexesTest(unittest.TestCase):
        ExtendedBlogPost.ensure_indexes()
        info = ExtendedBlogPost.objects._collection.index_information()
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
        for expected in expected_specs:
-            self.assertIn(expected['fields'], info)
+            self.assertTrue(expected['fields'] in info)
    def test_indexes_document_inheritance(self):
        """Ensure that indexes are used when meta[indexes] is specified for
@@ -224,8 +225,8 @@ class IndexesTest(unittest.TestCase):
        # Indexes are lazy so use list() to perform query
        list(Person.objects)
        info = Person.objects._collection.index_information()
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
-        self.assertIn([('rank.title', 1)], info)
+        self.assertTrue([('rank.title', 1)] in info)
    def test_explicit_geo2d_index(self):
        """Ensure that geo2d indexes work when created via meta[indexes]
@@ -244,8 +245,8 @@ class IndexesTest(unittest.TestCase):
        Place.ensure_indexes()
        info = Place._get_collection().index_information()
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
-        self.assertIn([('location.point', '2d')], info)
+        self.assertTrue([('location.point', '2d')] in info)
    def test_explicit_geo2d_index_embedded(self):
        """Ensure that geo2d indexes work when created via meta[indexes]
@@ -267,8 +268,8 @@ class IndexesTest(unittest.TestCase):
        Place.ensure_indexes()
        info = Place._get_collection().index_information()
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
-        self.assertIn([('current.location.point', '2d')], info)
+        self.assertTrue([('current.location.point', '2d')] in info)
    def test_explicit_geosphere_index(self):
        """Ensure that geosphere indexes work when created via meta[indexes]
@@ -287,8 +288,8 @@ class IndexesTest(unittest.TestCase):
        Place.ensure_indexes()
        info = Place._get_collection().index_information()
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
-        self.assertIn([('location.point', '2dsphere')], info)
+        self.assertTrue([('location.point', '2dsphere')] in info)
    def test_explicit_geohaystack_index(self):
        """Ensure that geohaystack indexes work when created via meta[indexes]
@@ -309,8 +310,8 @@ class IndexesTest(unittest.TestCase):
        Place.ensure_indexes()
        info = Place._get_collection().index_information()
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
-        self.assertIn([('location.point', 'geoHaystack')], info)
+        self.assertTrue([('location.point', 'geoHaystack')] in info)
    def test_create_geohaystack_index(self):
        """Ensure that geohaystack indexes can be created
@@ -321,8 +322,8 @@ class IndexesTest(unittest.TestCase):
        Place.create_index({'fields': (')location.point', 'name')}, bucketSize=10)
        info = Place._get_collection().index_information()
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
-        self.assertIn([('location.point', 'geoHaystack'), ('name', 1)], info)
+        self.assertTrue([('location.point', 'geoHaystack'), ('name', 1)] in info)
    def test_dictionary_indexes(self):
        """Ensure that indexes are used when meta[indexes] contains
@@ -354,8 +355,8 @@ class IndexesTest(unittest.TestCase):
        info = [(value['key'],
                 value.get('unique', False),
                 value.get('sparse', False))
-                for key, value in iteritems(info)]
+                for key, value in info.iteritems()]
-        self.assertIn(([('addDate', -1)], True, True), info)
+        self.assertTrue(([('addDate', -1)], True, True) in info)
        BlogPost.drop_collection()
@@ -406,7 +407,7 @@ class IndexesTest(unittest.TestCase):
        self.assertEqual(2, User.objects.count())
        info = User.objects._collection.index_information()
-        self.assertEqual(list(info.keys()), ['_id_'])
+        self.assertEqual(info.keys(), ['_id_'])
        User.ensure_indexes()
        info = User.objects._collection.index_information()
@@ -475,6 +476,7 @@ class IndexesTest(unittest.TestCase):
    def test_covered_index(self):
        """Ensure that covered indexes can be used
        """
        class Test(Document):
            a = IntField()
            b = IntField()
@@ -489,41 +491,38 @@ class IndexesTest(unittest.TestCase):
        obj = Test(a=1)
        obj.save()
        IS_MONGODB_3 = get_mongodb_version()[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.
        query_plan = Test.objects(id=obj.id).exclude('a').explain()
-        self.assertEqual(
+        if not IS_MONGODB_3:
-            query_plan.get('queryPlanner').get('winningPlan').get('inputStage').get('stage'),
+            self.assertFalse(query_plan['indexOnly'])
-            'IDHACK'
+        else:
-        )
+            self.assertEqual(query_plan.get('queryPlanner').get('winningPlan').get('inputStage').get('stage'), 'IDHACK')
        query_plan = Test.objects(id=obj.id).only('id').explain()
-        self.assertEqual(
+        if not IS_MONGODB_3:
-            query_plan.get('queryPlanner').get('winningPlan').get('inputStage').get('stage'),
+            self.assertTrue(query_plan['indexOnly'])
-            'IDHACK'
+        else:
-        )
+            self.assertEqual(query_plan.get('queryPlanner').get('winningPlan').get('inputStage').get('stage'), 'IDHACK')
        query_plan = Test.objects(a=1).only('a').exclude('id').explain()
-        self.assertEqual(
+        if not IS_MONGODB_3:
-            query_plan.get('queryPlanner').get('winningPlan').get('inputStage').get('stage'),
+            self.assertTrue(query_plan['indexOnly'])
-            'IXSCAN'
+        else:
-        )
+            self.assertEqual(query_plan.get('queryPlanner').get('winningPlan').get('inputStage').get('stage'), 'IXSCAN')
-        self.assertEqual(
+            self.assertEqual(query_plan.get('queryPlanner').get('winningPlan').get('stage'), 'PROJECTION')
            query_plan.get('queryPlanner').get('winningPlan').get('stage'),
            'PROJECTION'
        )
        query_plan = Test.objects(a=1).explain()
-        self.assertEqual(
+        if not IS_MONGODB_3:
-            query_plan.get('queryPlanner').get('winningPlan').get('inputStage').get('stage'),
+            self.assertFalse(query_plan['indexOnly'])
-            'IXSCAN'
+        else:
-        )
+            self.assertEqual(query_plan.get('queryPlanner').get('winningPlan').get('inputStage').get('stage'), 'IXSCAN')
-        self.assertEqual(
+            self.assertEqual(query_plan.get('queryPlanner').get('winningPlan').get('stage'), 'FETCH')
            query_plan.get('queryPlanner').get('winningPlan').get('stage'),
            'FETCH'
        )
    def test_index_on_id(self):
        class BlogPost(Document):
            meta = {
                'indexes': [
@@ -542,46 +541,40 @@ class IndexesTest(unittest.TestCase):
                                 [('categories', 1), ('_id', 1)])
    def test_hint(self):
        TAGS_INDEX_NAME = 'tags_1'
        class BlogPost(Document):
            tags = ListField(StringField())
            meta = {
                'indexes': [
-                    {
+                    'tags',
                        'fields': ['tags'],
                        'name': TAGS_INDEX_NAME
                    }
                ],
            }
        BlogPost.drop_collection()
-        for i in range(10):
+        for i in range(0, 10):
-            tags = [("tag %i" % n) for n in range(i % 2)]
+            tags = [("tag %i" % n) for n in range(0, i % 2)]
            BlogPost(tags=tags).save()
-        # Hinting by shape should work.
+        self.assertEqual(BlogPost.objects.count(), 10)
        self.assertEqual(BlogPost.objects.hint().count(), 10)
        # PyMongo 3.0 bug only, works correctly with 2.X and 3.0.1+ versions
        if pymongo.version != '3.0':
            self.assertEqual(BlogPost.objects.hint([('tags', 1)]).count(), 10)
-        # Hinting by index name should work.
+            self.assertEqual(BlogPost.objects.hint([('ZZ', 1)]).count(), 10)
        self.assertEqual(BlogPost.objects.hint(TAGS_INDEX_NAME).count(), 10)
-        # Clearing the hint should work fine.
+        if pymongo.version >= '2.8':
-        self.assertEqual(BlogPost.objects.hint().count(), 10)
+            self.assertEqual(BlogPost.objects.hint('tags').count(), 10)
-        self.assertEqual(BlogPost.objects.hint([('ZZ', 1)]).hint().count(), 10)
+        else:
            def invalid_index():
                BlogPost.objects.hint('tags').next()
            self.assertRaises(TypeError, invalid_index)
-        # Hinting on a non-existent index shape should fail.
+        def invalid_index_2():
-        with self.assertRaises(OperationFailure):
+            return BlogPost.objects.hint(('tags', 1)).next()
-            BlogPost.objects.hint([('ZZ', 1)]).count()
+        self.assertRaises(Exception, invalid_index_2)
        # Hinting on a non-existent index name should fail.
        with self.assertRaises(OperationFailure):
            BlogPost.objects.hint('Bad Name').count()
        # Invalid shape argument (missing list brackets) should fail.
        with self.assertRaises(ValueError):
            BlogPost.objects.hint(('tags', 1)).count()
    def test_unique(self):
        """Ensure that uniqueness constraints are applied to fields.
@@ -598,32 +591,10 @@ class IndexesTest(unittest.TestCase):
        # Two posts with the same slug is not allowed
        post2 = BlogPost(title='test2', slug='test')
        self.assertRaises(NotUniqueError, post2.save)
        self.assertRaises(NotUniqueError, BlogPost.objects.insert, post2)
-        # Ensure backwards compatibility for errors
+        # Ensure backwards compatibilty for errors
        self.assertRaises(OperationError, post2.save)
    def test_primary_key_unique_not_working(self):
        """Relates to #1445"""
        class Blog(Document):
            id = StringField(primary_key=True, unique=True)
        Blog.drop_collection()
        with self.assertRaises(OperationFailure) as ctx_err:
            Blog(id='garbage').save()
        # One of the errors below should happen. Which one depends on the
        # PyMongo version and dict order.
        err_msg = str(ctx_err.exception)
        self.assertTrue(
            any([
                "The field 'unique' is not valid for an _id index specification" in err_msg,
                "The field 'background' is not valid for an _id index specification" in err_msg,
                "The field 'sparse' is not valid for an _id index specification" in err_msg,
            ])
        )
    def test_unique_with(self):
        """Ensure that unique_with constraints are applied to fields.
        """
@@ -705,77 +676,6 @@ class IndexesTest(unittest.TestCase):
        self.assertRaises(NotUniqueError, post2.save)
    def test_unique_embedded_document_in_sorted_list(self):
        """
        Ensure that the uniqueness constraints are applied to fields in
        embedded documents, even when the embedded documents in a sorted list
        field.
        """
        class SubDocument(EmbeddedDocument):
            year = IntField()
            slug = StringField(unique=True)
        class BlogPost(Document):
            title = StringField()
            subs = SortedListField(EmbeddedDocumentField(SubDocument),
                                   ordering='year')
        BlogPost.drop_collection()
        post1 = BlogPost(
            title='test1', subs=[
                SubDocument(year=2009, slug='conflict'),
                SubDocument(year=2009, slug='conflict')
            ]
        )
        post1.save()
        # confirm that the unique index is created
        indexes = BlogPost._get_collection().index_information()
        self.assertIn('subs.slug_1', indexes)
        self.assertTrue(indexes['subs.slug_1']['unique'])
        post2 = BlogPost(
            title='test2', subs=[SubDocument(year=2014, slug='conflict')]
        )
        self.assertRaises(NotUniqueError, post2.save)
    def test_unique_embedded_document_in_embedded_document_list(self):
        """
        Ensure that the uniqueness constraints are applied to fields in
        embedded documents, even when the embedded documents in an embedded
        list field.
        """
        class SubDocument(EmbeddedDocument):
            year = IntField()
            slug = StringField(unique=True)
        class BlogPost(Document):
            title = StringField()
            subs = EmbeddedDocumentListField(SubDocument)
        BlogPost.drop_collection()
        post1 = BlogPost(
            title='test1', subs=[
                SubDocument(year=2009, slug='conflict'),
                SubDocument(year=2009, slug='conflict')
            ]
        )
        post1.save()
        # confirm that the unique index is created
        indexes = BlogPost._get_collection().index_information()
        self.assertIn('subs.slug_1', indexes)
        self.assertTrue(indexes['subs.slug_1']['unique'])
        post2 = BlogPost(
            title='test2', subs=[SubDocument(year=2014, slug='conflict')]
        )
        self.assertRaises(NotUniqueError, post2.save)
    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.
@@ -827,18 +727,6 @@ class IndexesTest(unittest.TestCase):
        self.assertEqual(3600,
                         info['created_1']['expireAfterSeconds'])
    def test_index_drop_dups_silently_ignored(self):
        class Customer(Document):
            cust_id = IntField(unique=True, required=True)
            meta = {
                'indexes': ['cust_id'],
                'index_drop_dups': True,
                'allow_inheritance': False,
            }
        Customer.drop_collection()
        Customer.objects.first()
    def test_unique_and_indexes(self):
        """Ensure that 'unique' constraints aren't overridden by
        meta.indexes.
@@ -855,23 +743,18 @@ class IndexesTest(unittest.TestCase):
        cust.save()
        cust_dupe = Customer(cust_id=1)
-        with self.assertRaises(NotUniqueError):
+        try:
            cust_dupe.save()
            raise AssertionError("We saved a dupe!")
        except NotUniqueError:
            pass
-        cust = Customer(cust_id=2)
+    def test_unique_and_primary(self):
        cust.save()
        # duplicate key on update
        with self.assertRaises(NotUniqueError):
            cust.cust_id = 1
            cust.save()
    def test_primary_save_duplicate_update_existing_object(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)
+            name = StringField(primary_key=True, unique=True)
            password = StringField()
        User.drop_collection()
@@ -918,9 +801,9 @@ class IndexesTest(unittest.TestCase):
            self.fail('Unbound local error at index + pk definition')
        info = BlogPost.objects._collection.index_information()
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
        index_item = [('_id', 1), ('comments.comment_id', 1)]
-        self.assertIn(index_item, info)
+        self.assertTrue(index_item in info)
    def test_compound_key_embedded(self):
@@ -966,9 +849,9 @@ class IndexesTest(unittest.TestCase):
            }
        info = MyDoc.objects._collection.index_information()
-        info = [value['key'] for key, value in iteritems(info)]
+        info = [value['key'] for key, value in info.iteritems()]
-        self.assertIn([('provider_ids.foo', 1)], info)
+        self.assertTrue([('provider_ids.foo', 1)] in info)
-        self.assertIn([('provider_ids.bar', 1)], info)
+        self.assertTrue([('provider_ids.bar', 1)] in info)
    def test_sparse_compound_indexes(self):
@@ -984,6 +867,7 @@ 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()
@@ -992,9 +876,9 @@ class IndexesTest(unittest.TestCase):
            }
        indexes = Book.objects._collection.index_information()
-        self.assertIn("title_text", indexes)
+        self.assertTrue("title_text" in indexes)
        key = indexes["title_text"]["key"]
-        self.assertIn(('_fts', 'text'), key)
+        self.assertTrue(('_fts', 'text') in key)
    def test_hashed_indexes(self):
@@ -1005,8 +889,8 @@ class IndexesTest(unittest.TestCase):
            }
        indexes = Book.objects._collection.index_information()
-        self.assertIn("ref_id_hashed", indexes)
+        self.assertTrue("ref_id_hashed" in indexes)
-        self.assertIn(('ref_id', 'hashed'), indexes["ref_id_hashed"]["key"])
+        self.assertTrue(('ref_id', 'hashed') in indexes["ref_id_hashed"]["key"])
    def test_indexes_after_database_drop(self):
        """
@@ -1047,6 +931,7 @@ class IndexesTest(unittest.TestCase):
            # Drop the temporary database at the end
            connection.drop_database('tempdatabase')
    def test_index_dont_send_cls_option(self):
        """
        Ensure that 'cls' option is not sent through ensureIndex. We shouldn't
@@ -1128,7 +1013,7 @@ class IndexesTest(unittest.TestCase):
        TestDoc.ensure_indexes()
        index_info = TestDoc._get_collection().index_information()
-        self.assertIn('shard_1_1__cls_1_txt_1_1', index_info)
+        self.assertTrue('shard_1_1__cls_1_txt_1_1' in index_info)
 if __name__ == '__main__':
--- a/tests/document/inheritance.py
+++ b/tests/document/inheritance.py
@@ -2,45 +2,30 @@
 import unittest
 import warnings
-from six import iteritems
+from datetime import datetime
 from mongoengine import (BooleanField, Document, EmbeddedDocument,
                         EmbeddedDocumentField, GenericReferenceField,
                         IntField, ReferenceField, StringField)
 from mongoengine.pymongo_support import list_collection_names
 from tests.utils import MongoDBTestCase
 from tests.fixtures import Base
 from mongoengine import Document, EmbeddedDocument, connect
 from mongoengine.connection import get_db
 from mongoengine.fields import (BooleanField, GenericReferenceField,
                                IntField, StringField)
 __all__ = ('InheritanceTest', )
-class InheritanceTest(MongoDBTestCase):
+class InheritanceTest(unittest.TestCase):
    def setUp(self):
        connect(db='mongoenginetest')
        self.db = get_db()
    def tearDown(self):
-        for collection in list_collection_names(self.db):
+        for collection in self.db.collection_names():
            if 'system.' in collection:
                continue
            self.db.drop_collection(collection)
    def test_constructor_cls(self):
        # Ensures _cls is properly set during construction
        # and when object gets reloaded (prevent regression of #1950)
        class EmbedData(EmbeddedDocument):
            data = StringField()
            meta = {'allow_inheritance': True}
        class DataDoc(Document):
            name = StringField()
            embed = EmbeddedDocumentField(EmbedData)
            meta = {'allow_inheritance': True}
        test_doc = DataDoc(name='test', embed=EmbedData(data='data'))
        self.assertEqual(test_doc._cls, 'DataDoc')
        self.assertEqual(test_doc.embed._cls, 'EmbedData')
        test_doc.save()
        saved_doc = DataDoc.objects.with_id(test_doc.id)
        self.assertEqual(test_doc._cls, saved_doc._cls)
        self.assertEqual(test_doc.embed._cls, saved_doc.embed._cls)
        test_doc.delete()
    def test_superclasses(self):
        """Ensure that the correct list of superclasses is assembled.
        """
@@ -273,10 +258,9 @@ class InheritanceTest(MongoDBTestCase):
            name = StringField()
        # can't inherit because Animal didn't explicitly allow inheritance
-        with self.assertRaises(ValueError) as cm:
+        with self.assertRaises(ValueError):
            class Dog(Animal):
                pass
        self.assertIn("Document Animal may not be subclassed", str(cm.exception))
        # Check that _cls etc aren't present on simple documents
        dog = Animal(name='dog').save()
@@ -284,7 +268,7 @@ class InheritanceTest(MongoDBTestCase):
        collection = self.db[Animal._get_collection_name()]
        obj = collection.find_one()
-        self.assertNotIn('_cls', obj)
+        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.
@@ -293,10 +277,9 @@ class InheritanceTest(MongoDBTestCase):
            name = StringField()
            meta = {'allow_inheritance': True}
-        with self.assertRaises(ValueError) as cm:
+        with self.assertRaises(ValueError):
            class Mammal(Animal):
                meta = {'allow_inheritance': False}
        self.assertEqual(str(cm.exception), 'Only direct subclasses of Document may set "allow_inheritance" to False')
    def test_allow_inheritance_abstract_document(self):
        """Ensure that abstract documents can set inheritance rules and that
@@ -309,48 +292,13 @@ class InheritanceTest(MongoDBTestCase):
        class Animal(FinalDocument):
            name = StringField()
-        with self.assertRaises(ValueError) as cm:
+        with self.assertRaises(ValueError):
            class Mammal(Animal):
                pass
        # Check that _cls isn't present in simple documents
        doc = Animal(name='dog')
-        self.assertNotIn('_cls', doc.to_mongo())
+        self.assertFalse('_cls' in doc.to_mongo())
    def test_using_abstract_class_in_reference_field(self):
        # Ensures no regression of #1920
        class AbstractHuman(Document):
            meta = {'abstract': True}
        class Dad(AbstractHuman):
            name = StringField()
        class Home(Document):
            dad = ReferenceField(AbstractHuman)  # Referencing the abstract class
            address = StringField()
        dad = Dad(name='5').save()
        Home(dad=dad, address='street').save()
        home = Home.objects.first()
        home.address = 'garbage'
        home.save()     # Was failing with ValidationError
    def test_abstract_class_referencing_self(self):
        # Ensures no regression of #1920
        class Human(Document):
            meta = {'abstract': True}
            creator = ReferenceField('self', dbref=True)
        class User(Human):
            name = StringField()
        user = User(name='John').save()
        user2 = User(name='Foo', creator=user).save()
        user2 = User.objects.with_id(user2.id)
        user2.name = 'Bar'
        user2.save()    # Was failing with ValidationError
    def test_abstract_handle_ids_in_metaclass_properly(self):
@@ -410,11 +358,11 @@ class InheritanceTest(MongoDBTestCase):
            meta = {'abstract': True,
                    'allow_inheritance': False}
-        city = City(continent='asia')
+        bkk = City(continent='asia')
-        self.assertEqual(None, city.pk)
+        self.assertEqual(None, bkk.pk)
        # TODO: expected error? Shouldn't we create a new error type?
        with self.assertRaises(KeyError):
-            setattr(city, 'pk', 1)
+            setattr(bkk, 'pk', 1)
    def test_allow_inheritance_embedded_document(self):
        """Ensure embedded documents respect inheritance."""
@@ -426,14 +374,14 @@ class InheritanceTest(MongoDBTestCase):
                pass
        doc = Comment(content='test')
-        self.assertNotIn('_cls', doc.to_mongo())
+        self.assertFalse('_cls' in doc.to_mongo())
        class Comment(EmbeddedDocument):
            content = StringField()
            meta = {'allow_inheritance': True}
        doc = Comment(content='test')
-        self.assertIn('_cls', doc.to_mongo())
+        self.assertTrue('_cls' in doc.to_mongo())
    def test_document_inheritance(self):
        """Ensure mutliple inheritance of abstract documents
@@ -482,12 +430,12 @@ class InheritanceTest(MongoDBTestCase):
            meta = {'abstract': True}
        class Human(Mammal): pass
-        for k, v in iteritems(defaults):
+        for k, v in defaults.iteritems():
            for cls in [Animal, Fish, Guppy]:
                self.assertEqual(cls._meta[k], v)
-        self.assertNotIn('collection', Animal._meta)
+        self.assertFalse('collection' in Animal._meta)
-        self.assertNotIn('collection', Mammal._meta)
+        self.assertFalse('collection' in Mammal._meta)
        self.assertEqual(Animal._get_collection_name(), None)
        self.assertEqual(Mammal._get_collection_name(), None)
--- a/tests/document/instance.py
+++ b/tests/document/instance.py
--- a/tests/document/json_serialisation.py
+++ b/tests/document/json_serialisation.py
@@ -32,12 +32,12 @@ class TestJson(unittest.TestCase):
            string = StringField(db_field='s')
            embedded = EmbeddedDocumentField(Embedded, db_field='e')
-        doc = Doc(string="Hello", embedded=Embedded(string="Inner Hello"))
+        doc = Doc( string="Hello", embedded=Embedded(string="Inner Hello"))
-        doc_json = doc.to_json(sort_keys=True, use_db_field=False, separators=(',', ':'))
+        doc_json = doc.to_json(sort_keys=True, use_db_field=False,separators=(',', ':'))
        expected_json = """{"embedded":{"string":"Inner Hello"},"string":"Hello"}"""
-        self.assertEqual(doc_json, expected_json)
+        self.assertEqual( doc_json, expected_json)
    def test_json_simple(self):
@@ -61,6 +61,10 @@ class TestJson(unittest.TestCase):
        self.assertEqual(doc, Doc.from_json(doc.to_json()))
    def test_json_complex(self):
        if pymongo.version_tuple[0] <= 2 and pymongo.version_tuple[1] <= 3:
            raise SkipTest("Need pymongo 2.4 as has a fix for DBRefs")
        class EmbeddedDoc(EmbeddedDocument):
            pass
--- a/tests/document/validation.py
+++ b/tests/document/validation.py
@@ -20,16 +20,16 @@ class ValidatorErrorTest(unittest.TestCase):
        # 1st level error schema
        error.errors = {'1st': ValidationError('bad 1st'), }
-        self.assertIn('1st', error.to_dict())
+        self.assertTrue('1st' in error.to_dict())
        self.assertEqual(error.to_dict()['1st'], 'bad 1st')
        # 2nd level error schema
        error.errors = {'1st': ValidationError('bad 1st', errors={
            '2nd': ValidationError('bad 2nd'),
        })}
-        self.assertIn('1st', error.to_dict())
+        self.assertTrue('1st' in error.to_dict())
-        self.assertIsInstance(error.to_dict()['1st'], dict)
+        self.assertTrue(isinstance(error.to_dict()['1st'], dict))
-        self.assertIn('2nd', error.to_dict()['1st'])
+        self.assertTrue('2nd' in error.to_dict()['1st'])
        self.assertEqual(error.to_dict()['1st']['2nd'], 'bad 2nd')
        # moar levels
@@ -40,10 +40,10 @@ class ValidatorErrorTest(unittest.TestCase):
                }),
            }),
        })}
-        self.assertIn('1st', error.to_dict())
+        self.assertTrue('1st' in error.to_dict())
-        self.assertIn('2nd', error.to_dict()['1st'])
+        self.assertTrue('2nd' in error.to_dict()['1st'])
-        self.assertIn('3rd', error.to_dict()['1st']['2nd'])
+        self.assertTrue('3rd' in error.to_dict()['1st']['2nd'])
-        self.assertIn('4th', error.to_dict()['1st']['2nd']['3rd'])
+        self.assertTrue('4th' in error.to_dict()['1st']['2nd']['3rd'])
        self.assertEqual(error.to_dict()['1st']['2nd']['3rd']['4th'],
                         'Inception')
@@ -58,7 +58,7 @@ class ValidatorErrorTest(unittest.TestCase):
        try:
            User().validate()
        except ValidationError as e:
-            self.assertIn("User:None", e.message)
+            self.assertTrue("User:None" in e.message)
            self.assertEqual(e.to_dict(), {
                'username': 'Field is required',
                'name': 'Field is required'})
@@ -68,7 +68,7 @@ class ValidatorErrorTest(unittest.TestCase):
        try:
            user.save()
        except ValidationError as e:
-            self.assertIn("User:RossC0", e.message)
+            self.assertTrue("User:RossC0" in e.message)
            self.assertEqual(e.to_dict(), {
                'name': 'Field is required'})
@@ -116,7 +116,7 @@ class ValidatorErrorTest(unittest.TestCase):
        try:
            Doc(id="bad").validate()
        except ValidationError as e:
-            self.assertIn("SubDoc:None", e.message)
+            self.assertTrue("SubDoc:None" in e.message)
            self.assertEqual(e.to_dict(), {
                "e": {'val': 'OK could not be converted to int'}})
@@ -127,14 +127,14 @@ class ValidatorErrorTest(unittest.TestCase):
        doc = Doc.objects.first()
        keys = doc._data.keys()
        self.assertEqual(2, len(keys))
-        self.assertIn('e', keys)
+        self.assertTrue('e' in keys)
-        self.assertIn('id', keys)
+        self.assertTrue('id' in keys)
        doc.e.val = "OK"
        try:
            doc.save()
        except ValidationError as e:
-            self.assertIn("Doc:test", e.message)
+            self.assertTrue("Doc:test" in e.message)
            self.assertEqual(e.to_dict(), {
                "e": {'val': 'OK could not be converted to int'}})
--- a/tests/fields/init.py
+++ b/tests/fields/init.py
@@ -1,3 +1,3 @@
-from .fields import *
+from fields import *
-from .file_tests import *
+from file_tests import *
-from .geo import *
+from geo import *
--- a/tests/fields/fields.py
+++ b/tests/fields/fields.py
--- a/tests/fields/file_tests.py
+++ b/tests/fields/file_tests.py
@@ -24,16 +24,6 @@ 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')
 def get_file(path):
    """Use a BytesIO instead of a file to allow
    to have a one-liner and avoid that the file remains opened"""
    bytes_io = StringIO()
    with open(path, 'rb') as f:
        bytes_io.write(f.read())
    bytes_io.seek(0)
    return bytes_io
 class FileTest(MongoDBTestCase):
    def tearDown(self):
@@ -63,8 +53,8 @@ class FileTest(MongoDBTestCase):
        putfile.save()
        result = PutFile.objects.first()
-        self.assertEqual(putfile, result)
+        self.assertTrue(putfile == result)
-        self.assertEqual("%s" % result.the_file, "<GridFSProxy: hello (%s)>" % result.the_file.grid_id)
+        self.assertEqual("%s" % result.the_file, "<GridFSProxy: hello>")
        self.assertEqual(result.the_file.read(), text)
        self.assertEqual(result.the_file.content_type, content_type)
        result.the_file.delete()  # Remove file from GridFS
@@ -81,7 +71,7 @@ class FileTest(MongoDBTestCase):
        putfile.save()
        result = PutFile.objects.first()
-        self.assertEqual(putfile, result)
+        self.assertTrue(putfile == result)
        self.assertEqual(result.the_file.read(), text)
        self.assertEqual(result.the_file.content_type, content_type)
        result.the_file.delete()
@@ -106,7 +96,7 @@ class FileTest(MongoDBTestCase):
        streamfile.save()
        result = StreamFile.objects.first()
-        self.assertEqual(streamfile, result)
+        self.assertTrue(streamfile == result)
        self.assertEqual(result.the_file.read(), text + more_text)
        self.assertEqual(result.the_file.content_type, content_type)
        result.the_file.seek(0)
@@ -142,7 +132,7 @@ class FileTest(MongoDBTestCase):
        streamfile.save()
        result = StreamFile.objects.first()
-        self.assertEqual(streamfile, result)
+        self.assertTrue(streamfile == result)
        self.assertEqual(result.the_file.read(), text + more_text)
        # self.assertEqual(result.the_file.content_type, content_type)
        result.the_file.seek(0)
@@ -171,7 +161,7 @@ class FileTest(MongoDBTestCase):
        setfile.save()
        result = SetFile.objects.first()
-        self.assertEqual(setfile, result)
+        self.assertTrue(setfile == result)
        self.assertEqual(result.the_file.read(), text)
        # Try replacing file with new one
@@ -179,7 +169,7 @@ class FileTest(MongoDBTestCase):
        result.save()
        result = SetFile.objects.first()
-        self.assertEqual(setfile, result)
+        self.assertTrue(setfile == result)
        self.assertEqual(result.the_file.read(), more_text)
        result.the_file.delete()
@@ -241,8 +231,8 @@ class FileTest(MongoDBTestCase):
        test_file_dupe = TestFile()
        data = test_file_dupe.the_file.read()  # Should be None
-        self.assertNotEqual(test_file.name, test_file_dupe.name)
+        self.assertTrue(test_file.name != test_file_dupe.name)
-        self.assertNotEqual(test_file.the_file.read(), data)
+        self.assertTrue(test_file.the_file.read() != data)
        TestFile.drop_collection()
@@ -257,8 +247,8 @@ class FileTest(MongoDBTestCase):
        Animal.drop_collection()
        marmot = Animal(genus='Marmota', family='Sciuridae')
-        marmot_photo_content = get_file(TEST_IMAGE_PATH)  # Retrieve a photo from disk
+        marmot_photo = open(TEST_IMAGE_PATH, 'rb')  # Retrieve a photo from disk
-        marmot.photo.put(marmot_photo_content, content_type='image/jpeg', foo='bar')
+        marmot.photo.put(marmot_photo, content_type='image/jpeg', foo='bar')
        marmot.photo.close()
        marmot.save()
@@ -271,11 +261,11 @@ class FileTest(MongoDBTestCase):
            the_file = FileField()
        TestFile.drop_collection()
-        test_file = TestFile(the_file=get_file(TEST_IMAGE_PATH)).save()
+        test_file = TestFile(the_file=open(TEST_IMAGE_PATH, 'rb')).save()
        self.assertEqual(test_file.the_file.get().length, 8313)
        test_file = TestFile.objects.first()
-        test_file.the_file = get_file(TEST_IMAGE2_PATH)
+        test_file.the_file = open(TEST_IMAGE2_PATH, 'rb')
        test_file.save()
        self.assertEqual(test_file.the_file.get().length, 4971)
@@ -301,7 +291,7 @@ class FileTest(MongoDBTestCase):
            the_file = FileField()
        test_file = TestFile()
-        self.assertNotIn(test_file.the_file, [{"test": 1}])
+        self.assertFalse(test_file.the_file in [{"test": 1}])
    def test_file_disk_space(self):
        """ Test disk space usage when we delete/replace a file """
@@ -320,16 +310,16 @@ class FileTest(MongoDBTestCase):
        files = db.fs.files.find()
        chunks = db.fs.chunks.find()
-        self.assertEqual(len(list(files)), 1)
+        self.assertEquals(len(list(files)), 1)
-        self.assertEqual(len(list(chunks)), 1)
+        self.assertEquals(len(list(chunks)), 1)
        # Deleting the docoument should delete the files
        testfile.delete()
        files = db.fs.files.find()
        chunks = db.fs.chunks.find()
-        self.assertEqual(len(list(files)), 0)
+        self.assertEquals(len(list(files)), 0)
-        self.assertEqual(len(list(chunks)), 0)
+        self.assertEquals(len(list(chunks)), 0)
        # Test case where we don't store a file in the first place
        testfile = TestFile()
@@ -337,15 +327,15 @@ class FileTest(MongoDBTestCase):
        files = db.fs.files.find()
        chunks = db.fs.chunks.find()
-        self.assertEqual(len(list(files)), 0)
+        self.assertEquals(len(list(files)), 0)
-        self.assertEqual(len(list(chunks)), 0)
+        self.assertEquals(len(list(chunks)), 0)
        testfile.delete()
        files = db.fs.files.find()
        chunks = db.fs.chunks.find()
-        self.assertEqual(len(list(files)), 0)
+        self.assertEquals(len(list(files)), 0)
-        self.assertEqual(len(list(chunks)), 0)
+        self.assertEquals(len(list(chunks)), 0)
        # Test case where we overwrite the file
        testfile = TestFile()
@@ -358,15 +348,15 @@ class FileTest(MongoDBTestCase):
        files = db.fs.files.find()
        chunks = db.fs.chunks.find()
-        self.assertEqual(len(list(files)), 1)
+        self.assertEquals(len(list(files)), 1)
-        self.assertEqual(len(list(chunks)), 1)
+        self.assertEquals(len(list(chunks)), 1)
        testfile.delete()
        files = db.fs.files.find()
        chunks = db.fs.chunks.find()
-        self.assertEqual(len(list(files)), 0)
+        self.assertEquals(len(list(files)), 0)
-        self.assertEqual(len(list(chunks)), 0)
+        self.assertEquals(len(list(chunks)), 0)
    def test_image_field(self):
        if not HAS_PIL:
@@ -389,7 +379,7 @@ class FileTest(MongoDBTestCase):
                self.assertEqual("%s" % e, "Invalid image: cannot identify image file %s" % f)
        t = TestImage()
-        t.image.put(get_file(TEST_IMAGE_PATH))
+        t.image.put(open(TEST_IMAGE_PATH, 'rb'))
        t.save()
        t = TestImage.objects.first()
@@ -410,11 +400,11 @@ class FileTest(MongoDBTestCase):
            the_file = ImageField()
        TestFile.drop_collection()
-        test_file = TestFile(the_file=get_file(TEST_IMAGE_PATH)).save()
+        test_file = TestFile(the_file=open(TEST_IMAGE_PATH, 'rb')).save()
        self.assertEqual(test_file.the_file.size, (371, 76))
        test_file = TestFile.objects.first()
-        test_file.the_file = get_file(TEST_IMAGE2_PATH)
+        test_file.the_file = open(TEST_IMAGE2_PATH, 'rb')
        test_file.save()
        self.assertEqual(test_file.the_file.size, (45, 101))
@@ -428,7 +418,7 @@ class FileTest(MongoDBTestCase):
        TestImage.drop_collection()
        t = TestImage()
-        t.image.put(get_file(TEST_IMAGE_PATH))
+        t.image.put(open(TEST_IMAGE_PATH, 'rb'))
        t.save()
        t = TestImage.objects.first()
@@ -451,7 +441,7 @@ class FileTest(MongoDBTestCase):
        TestImage.drop_collection()
        t = TestImage()
-        t.image.put(get_file(TEST_IMAGE_PATH))
+        t.image.put(open(TEST_IMAGE_PATH, 'rb'))
        t.save()
        t = TestImage.objects.first()
@@ -474,7 +464,7 @@ class FileTest(MongoDBTestCase):
        TestImage.drop_collection()
        t = TestImage()
-        t.image.put(get_file(TEST_IMAGE_PATH))
+        t.image.put(open(TEST_IMAGE_PATH, 'rb'))
        t.save()
        t = TestImage.objects.first()
@@ -552,8 +542,8 @@ class FileTest(MongoDBTestCase):
        TestImage.drop_collection()
        t = TestImage()
-        t.image1.put(get_file(TEST_IMAGE_PATH))
+        t.image1.put(open(TEST_IMAGE_PATH, 'rb'))
-        t.image2.put(get_file(TEST_IMAGE2_PATH))
+        t.image2.put(open(TEST_IMAGE2_PATH, 'rb'))
        t.save()
        test = TestImage.objects.first()
@@ -573,10 +563,12 @@ class FileTest(MongoDBTestCase):
        Animal.drop_collection()
        marmot = Animal(genus='Marmota', family='Sciuridae')
-        with open(TEST_IMAGE_PATH, 'rb') as marmot_photo:   # Retrieve a photo from disk
+        marmot_photo = open(TEST_IMAGE_PATH, 'rb')  # Retrieve a photo from disk
        photos_field = marmot._fields['photos'].field
        new_proxy = photos_field.get_proxy_obj('photos', marmot)
        new_proxy.put(marmot_photo, content_type='image/jpeg', foo='bar')
        marmot_photo.close()
        marmot.photos.append(new_proxy)
        marmot.save()
@@ -586,6 +578,5 @@ class FileTest(MongoDBTestCase):
        self.assertEqual(marmot.photos[0].foo, 'bar')
        self.assertEqual(marmot.photos[0].get().length, 8313)
 if __name__ == '__main__':
    unittest.main()
--- a/tests/fields/geo.py
+++ b/tests/fields/geo.py
@@ -40,11 +40,6 @@ class GeoFieldTest(unittest.TestCase):
            expected = "Both values (%s) in point must be float or int" % repr(coord)
            self._test_for_expected_error(Location, coord, expected)
        invalid_coords = [21, 4, 'a']
        for coord in invalid_coords:
            expected = "GeoPointField can only accept tuples or lists of (x, y)"
            self._test_for_expected_error(Location, coord, expected)
    def test_point_validation(self):
        class Location(Document):
            loc = PointField()
@@ -303,9 +298,9 @@ class GeoFieldTest(unittest.TestCase):
            polygon = PolygonField()
        geo_indicies = Event._geo_indices()
-        self.assertIn({'fields': [('line', '2dsphere')]}, geo_indicies)
+        self.assertTrue({'fields': [('line', '2dsphere')]} in geo_indicies)
-        self.assertIn({'fields': [('polygon', '2dsphere')]}, geo_indicies)
+        self.assertTrue({'fields': [('polygon', '2dsphere')]} in geo_indicies)
-        self.assertIn({'fields': [('point', '2dsphere')]}, geo_indicies)
+        self.assertTrue({'fields': [('point', '2dsphere')]} in geo_indicies)
    def test_indexes_2dsphere_embedded(self):
        """Ensure that indexes are created automatically for GeoPointFields.
@@ -321,9 +316,9 @@ class GeoFieldTest(unittest.TestCase):
            venue = EmbeddedDocumentField(Venue)
        geo_indicies = Event._geo_indices()
-        self.assertIn({'fields': [('venue.line', '2dsphere')]}, geo_indicies)
+        self.assertTrue({'fields': [('venue.line', '2dsphere')]} in geo_indicies)
-        self.assertIn({'fields': [('venue.polygon', '2dsphere')]}, geo_indicies)
+        self.assertTrue({'fields': [('venue.polygon', '2dsphere')]} in geo_indicies)
-        self.assertIn({'fields': [('venue.point', '2dsphere')]}, geo_indicies)
+        self.assertTrue({'fields': [('venue.point', '2dsphere')]} in geo_indicies)
    def test_geo_indexes_recursion(self):
@@ -340,9 +335,9 @@ class GeoFieldTest(unittest.TestCase):
        Parent(name='Berlin').save()
        info = Parent._get_collection().index_information()
-        self.assertNotIn('location_2d', info)
+        self.assertFalse('location_2d' in info)
        info = Location._get_collection().index_information()
-        self.assertIn('location_2d', info)
+        self.assertTrue('location_2d' in info)
        self.assertEqual(len(Parent._geo_indices()), 0)
        self.assertEqual(len(Location._geo_indices()), 1)
--- a/tests/fields/test_binary_field.py
+++ b/tests/fields/test_binary_field.py
@@ -1,143 +0,0 @@
 # -*- coding: utf-8 -*-
 import uuid
 from nose.plugins.skip import SkipTest
 import six
 from bson import Binary
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 BIN_VALUE = six.b('\xa9\xf3\x8d(\xd7\x03\x84\xb4k[\x0f\xe3\xa2\x19\x85p[J\xa3\xd2>\xde\xe6\x87\xb1\x7f\xc6\xe6\xd9r\x18\xf5')
 class TestBinaryField(MongoDBTestCase):
    def test_binary_fields(self):
        """Ensure that binary fields can be stored and retrieved.
        """
        class Attachment(Document):
            content_type = StringField()
            blob = BinaryField()
        BLOB = six.b('\xe6\x00\xc4\xff\x07')
        MIME_TYPE = 'application/octet-stream'
        Attachment.drop_collection()
        attachment = Attachment(content_type=MIME_TYPE, blob=BLOB)
        attachment.save()
        attachment_1 = Attachment.objects().first()
        self.assertEqual(MIME_TYPE, attachment_1.content_type)
        self.assertEqual(BLOB, six.binary_type(attachment_1.blob))
    def test_validation_succeeds(self):
        """Ensure that valid values can be assigned to binary fields.
        """
        class AttachmentRequired(Document):
            blob = BinaryField(required=True)
        class AttachmentSizeLimit(Document):
            blob = BinaryField(max_bytes=4)
        attachment_required = AttachmentRequired()
        self.assertRaises(ValidationError, attachment_required.validate)
        attachment_required.blob = Binary(six.b('\xe6\x00\xc4\xff\x07'))
        attachment_required.validate()
        _5_BYTES = six.b('\xe6\x00\xc4\xff\x07')
        _4_BYTES = six.b('\xe6\x00\xc4\xff')
        self.assertRaises(ValidationError, AttachmentSizeLimit(blob=_5_BYTES).validate)
        AttachmentSizeLimit(blob=_4_BYTES).validate()
    def test_validation_fails(self):
        """Ensure that invalid values cannot be assigned to binary fields."""
        class Attachment(Document):
            blob = BinaryField()
        for invalid_data in (2, u'Im_a_unicode', ['some_str']):
            self.assertRaises(ValidationError, Attachment(blob=invalid_data).validate)
    def test__primary(self):
        class Attachment(Document):
            id = BinaryField(primary_key=True)
        Attachment.drop_collection()
        binary_id = uuid.uuid4().bytes
        att = Attachment(id=binary_id).save()
        self.assertEqual(1, Attachment.objects.count())
        self.assertEqual(1, Attachment.objects.filter(id=att.id).count())
        att.delete()
        self.assertEqual(0, Attachment.objects.count())
    def test_primary_filter_by_binary_pk_as_str(self):
        raise SkipTest("Querying by id as string is not currently supported")
        class Attachment(Document):
            id = BinaryField(primary_key=True)
        Attachment.drop_collection()
        binary_id = uuid.uuid4().bytes
        att = Attachment(id=binary_id).save()
        self.assertEqual(1, Attachment.objects.filter(id=binary_id).count())
        att.delete()
        self.assertEqual(0, Attachment.objects.count())
    def test_match_querying_with_bytes(self):
        class MyDocument(Document):
            bin_field = BinaryField()
        MyDocument.drop_collection()
        doc = MyDocument(bin_field=BIN_VALUE).save()
        matched_doc = MyDocument.objects(bin_field=BIN_VALUE).first()
        self.assertEqual(matched_doc.id, doc.id)
    def test_match_querying_with_binary(self):
        class MyDocument(Document):
            bin_field = BinaryField()
        MyDocument.drop_collection()
        doc = MyDocument(bin_field=BIN_VALUE).save()
        matched_doc = MyDocument.objects(bin_field=Binary(BIN_VALUE)).first()
        self.assertEqual(matched_doc.id, doc.id)
    def test_modify_operation__set(self):
        """Ensures no regression of bug #1127"""
        class MyDocument(Document):
            some_field = StringField()
            bin_field = BinaryField()
        MyDocument.drop_collection()
        doc = MyDocument.objects(some_field='test').modify(
            upsert=True, new=True,
            set__bin_field=BIN_VALUE
        )
        self.assertEqual(doc.some_field, 'test')
        if six.PY3:
            self.assertEqual(doc.bin_field, BIN_VALUE)
        else:
            self.assertEqual(doc.bin_field, Binary(BIN_VALUE))
    def test_update_one(self):
        """Ensures no regression of bug #1127"""
        class MyDocument(Document):
            bin_field = BinaryField()
        MyDocument.drop_collection()
        bin_data = six.b('\xe6\x00\xc4\xff\x07')
        doc = MyDocument(bin_field=bin_data).save()
        n_updated = MyDocument.objects(bin_field=bin_data).update_one(bin_field=BIN_VALUE)
        self.assertEqual(n_updated, 1)
        fetched = MyDocument.objects.with_id(doc.id)
        if six.PY3:
            self.assertEqual(fetched.bin_field, BIN_VALUE)
        else:
            self.assertEqual(fetched.bin_field, Binary(BIN_VALUE))
--- a/tests/fields/test_boolean_field.py
+++ b/tests/fields/test_boolean_field.py
@@ -1,49 +0,0 @@
 # -*- coding: utf-8 -*-
 from mongoengine import *
 from tests.utils import MongoDBTestCase, get_as_pymongo
 class TestBooleanField(MongoDBTestCase):
    def test_storage(self):
        class Person(Document):
            admin = BooleanField()
        person = Person(admin=True)
        person.save()
        self.assertEqual(
            get_as_pymongo(person),
            {'_id': person.id,
             'admin': True})
    def test_validation(self):
        """Ensure that invalid values cannot be assigned to boolean
        fields.
        """
        class Person(Document):
            admin = BooleanField()
        person = Person()
        person.admin = True
        person.validate()
        person.admin = 2
        self.assertRaises(ValidationError, person.validate)
        person.admin = 'Yes'
        self.assertRaises(ValidationError, person.validate)
        person.admin = 'False'
        self.assertRaises(ValidationError, person.validate)
    def test_weirdness_constructor(self):
        """When attribute is set in contructor, it gets cast into a bool
        which causes some weird behavior. We dont necessarily want to maintain this behavior
        but its a known issue
        """
        class Person(Document):
            admin = BooleanField()
        new_person = Person(admin='False')
        self.assertTrue(new_person.admin)
        new_person = Person(admin='0')
        self.assertTrue(new_person.admin)
--- a/tests/fields/test_cached_reference_field.py
+++ b/tests/fields/test_cached_reference_field.py
@@ -1,446 +0,0 @@
 # -*- coding: utf-8 -*-
 from decimal import Decimal
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestCachedReferenceField(MongoDBTestCase):
    def test_get_and_save(self):
        """
        Tests #1047: CachedReferenceField creates DBRefs on to_python,
        but can't save them on to_mongo.
        """
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocorrence(Document):
            person = StringField()
            animal = CachedReferenceField(Animal)
        Animal.drop_collection()
        Ocorrence.drop_collection()
        Ocorrence(person="testte",
                  animal=Animal(name="Leopard", tag="heavy").save()).save()
        p = Ocorrence.objects.get()
        p.person = 'new_testte'
        p.save()
    def test_general_things(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocorrence(Document):
            person = StringField()
            animal = CachedReferenceField(
                Animal, fields=['tag'])
        Animal.drop_collection()
        Ocorrence.drop_collection()
        a = Animal(name="Leopard", tag="heavy")
        a.save()
        self.assertEqual(Animal._cached_reference_fields, [Ocorrence.animal])
        o = Ocorrence(person="teste", animal=a)
        o.save()
        p = Ocorrence(person="Wilson")
        p.save()
        self.assertEqual(Ocorrence.objects(animal=None).count(), 1)
        self.assertEqual(
            a.to_mongo(fields=['tag']), {'tag': 'heavy', "_id": a.pk})
        self.assertEqual(o.to_mongo()['animal']['tag'], 'heavy')
        # counts
        Ocorrence(person="teste 2").save()
        Ocorrence(person="teste 3").save()
        count = Ocorrence.objects(animal__tag='heavy').count()
        self.assertEqual(count, 1)
        ocorrence = Ocorrence.objects(animal__tag='heavy').first()
        self.assertEqual(ocorrence.person, "teste")
        self.assertIsInstance(ocorrence.animal, Animal)
    def test_with_decimal(self):
        class PersonAuto(Document):
            name = StringField()
            salary = DecimalField()
        class SocialTest(Document):
            group = StringField()
            person = CachedReferenceField(
                PersonAuto,
                fields=('salary',))
        PersonAuto.drop_collection()
        SocialTest.drop_collection()
        p = PersonAuto(name="Alberto", salary=Decimal('7000.00'))
        p.save()
        s = SocialTest(group="dev", person=p)
        s.save()
        self.assertEqual(
            SocialTest.objects._collection.find_one({'person.salary': 7000.00}), {
                '_id': s.pk,
                'group': s.group,
                'person': {
                    '_id': p.pk,
                    'salary': 7000.00
                }
            })
    def test_cached_reference_field_reference(self):
        class Group(Document):
            name = StringField()
        class Person(Document):
            name = StringField()
            group = ReferenceField(Group)
        class SocialData(Document):
            obs = StringField()
            tags = ListField(
                StringField())
            person = CachedReferenceField(
                Person,
                fields=('group',))
        Group.drop_collection()
        Person.drop_collection()
        SocialData.drop_collection()
        g1 = Group(name='dev')
        g1.save()
        g2 = Group(name="designers")
        g2.save()
        p1 = Person(name="Alberto", group=g1)
        p1.save()
        p2 = Person(name="Andre", group=g1)
        p2.save()
        p3 = Person(name="Afro design", group=g2)
        p3.save()
        s1 = SocialData(obs="testing 123", person=p1, tags=['tag1', 'tag2'])
        s1.save()
        s2 = SocialData(obs="testing 321", person=p3, tags=['tag3', 'tag4'])
        s2.save()
        self.assertEqual(SocialData.objects._collection.find_one(
            {'tags': 'tag2'}), {
                '_id': s1.pk,
                'obs': 'testing 123',
                'tags': ['tag1', 'tag2'],
                'person': {
                    '_id': p1.pk,
                    'group': g1.pk
                }
        })
        self.assertEqual(SocialData.objects(person__group=g2).count(), 1)
        self.assertEqual(SocialData.objects(person__group=g2).first(), s2)
    def test_cached_reference_field_push_with_fields(self):
        class Product(Document):
            name = StringField()
        Product.drop_collection()
        class Basket(Document):
            products = ListField(CachedReferenceField(Product, fields=['name']))
        Basket.drop_collection()
        product1 = Product(name='abc').save()
        product2 = Product(name='def').save()
        basket = Basket(products=[product1]).save()
        self.assertEqual(
            Basket.objects._collection.find_one(),
            {
                '_id': basket.pk,
                'products': [
                    {
                        '_id': product1.pk,
                        'name': product1.name
                    }
                ]
            }
        )
        # push to list
        basket.update(push__products=product2)
        basket.reload()
        self.assertEqual(
            Basket.objects._collection.find_one(),
            {
                '_id': basket.pk,
                'products': [
                    {
                        '_id': product1.pk,
                        'name': product1.name
                    },
                    {
                        '_id': product2.pk,
                        'name': product2.name
                    }
                ]
            }
        )
    def test_cached_reference_field_update_all(self):
        class Person(Document):
            TYPES = (
                ('pf', "PF"),
                ('pj', "PJ")
            )
            name = StringField()
            tp = StringField(choices=TYPES)
            father = CachedReferenceField('self', fields=('tp',))
        Person.drop_collection()
        a1 = Person(name="Wilson Father", tp="pj")
        a1.save()
        a2 = Person(name='Wilson Junior', tp='pf', father=a1)
        a2.save()
        a2 = Person.objects.with_id(a2.id)
        self.assertEqual(a2.father.tp, a1.tp)
        self.assertEqual(dict(a2.to_mongo()), {
            "_id": a2.pk,
            "name": u"Wilson Junior",
            "tp": u"pf",
            "father": {
                "_id": a1.pk,
                "tp": u"pj"
            }
        })
        self.assertEqual(Person.objects(father=a1)._query, {
            'father._id': a1.pk
        })
        self.assertEqual(Person.objects(father=a1).count(), 1)
        Person.objects.update(set__tp="pf")
        Person.father.sync_all()
        a2.reload()
        self.assertEqual(dict(a2.to_mongo()), {
            "_id": a2.pk,
            "name": u"Wilson Junior",
            "tp": u"pf",
            "father": {
                "_id": a1.pk,
                "tp": u"pf"
            }
        })
    def test_cached_reference_fields_on_embedded_documents(self):
        with self.assertRaises(InvalidDocumentError):
            class Test(Document):
                name = StringField()
            type('WrongEmbeddedDocument', (
                EmbeddedDocument,), {
                    'test': CachedReferenceField(Test)
            })
    def test_cached_reference_auto_sync(self):
        class Person(Document):
            TYPES = (
                ('pf', "PF"),
                ('pj', "PJ")
            )
            name = StringField()
            tp = StringField(
                choices=TYPES
            )
            father = CachedReferenceField('self', fields=('tp',))
        Person.drop_collection()
        a1 = Person(name="Wilson Father", tp="pj")
        a1.save()
        a2 = Person(name='Wilson Junior', tp='pf', father=a1)
        a2.save()
        a1.tp = 'pf'
        a1.save()
        a2.reload()
        self.assertEqual(dict(a2.to_mongo()), {
            '_id': a2.pk,
            'name': 'Wilson Junior',
            'tp': 'pf',
            'father': {
                '_id': a1.pk,
                'tp': 'pf'
            }
        })
    def test_cached_reference_auto_sync_disabled(self):
        class Persone(Document):
            TYPES = (
                ('pf', "PF"),
                ('pj', "PJ")
            )
            name = StringField()
            tp = StringField(
                choices=TYPES
            )
            father = CachedReferenceField(
                'self', fields=('tp',), auto_sync=False)
        Persone.drop_collection()
        a1 = Persone(name="Wilson Father", tp="pj")
        a1.save()
        a2 = Persone(name='Wilson Junior', tp='pf', father=a1)
        a2.save()
        a1.tp = 'pf'
        a1.save()
        self.assertEqual(Persone.objects._collection.find_one({'_id': a2.pk}), {
            '_id': a2.pk,
            'name': 'Wilson Junior',
            'tp': 'pf',
            'father': {
                '_id': a1.pk,
                'tp': 'pj'
            }
        })
    def test_cached_reference_embedded_fields(self):
        class Owner(EmbeddedDocument):
            TPS = (
                ('n', "Normal"),
                ('u', "Urgent")
            )
            name = StringField()
            tp = StringField(
                verbose_name="Type",
                db_field="t",
                choices=TPS)
        class Animal(Document):
            name = StringField()
            tag = StringField()
            owner = EmbeddedDocumentField(Owner)
        class Ocorrence(Document):
            person = StringField()
            animal = CachedReferenceField(
                Animal, fields=['tag', 'owner.tp'])
        Animal.drop_collection()
        Ocorrence.drop_collection()
        a = Animal(name="Leopard", tag="heavy",
                   owner=Owner(tp='u', name="Wilson Júnior")
                   )
        a.save()
        o = Ocorrence(person="teste", animal=a)
        o.save()
        self.assertEqual(dict(a.to_mongo(fields=['tag', 'owner.tp'])), {
            '_id': a.pk,
            'tag': 'heavy',
            'owner': {
                't': 'u'
            }
        })
        self.assertEqual(o.to_mongo()['animal']['tag'], 'heavy')
        self.assertEqual(o.to_mongo()['animal']['owner']['t'], 'u')
        # Check to_mongo with fields
        self.assertNotIn('animal', o.to_mongo(fields=['person']))
        # counts
        Ocorrence(person="teste 2").save()
        Ocorrence(person="teste 3").save()
        count = Ocorrence.objects(
            animal__tag='heavy', animal__owner__tp='u').count()
        self.assertEqual(count, 1)
        ocorrence = Ocorrence.objects(
            animal__tag='heavy',
            animal__owner__tp='u').first()
        self.assertEqual(ocorrence.person, "teste")
        self.assertIsInstance(ocorrence.animal, Animal)
    def test_cached_reference_embedded_list_fields(self):
        class Owner(EmbeddedDocument):
            name = StringField()
            tags = ListField(StringField())
        class Animal(Document):
            name = StringField()
            tag = StringField()
            owner = EmbeddedDocumentField(Owner)
        class Ocorrence(Document):
            person = StringField()
            animal = CachedReferenceField(
                Animal, fields=['tag', 'owner.tags'])
        Animal.drop_collection()
        Ocorrence.drop_collection()
        a = Animal(name="Leopard", tag="heavy",
                   owner=Owner(tags=['cool', 'funny'],
                               name="Wilson Júnior")
                   )
        a.save()
        o = Ocorrence(person="teste 2", animal=a)
        o.save()
        self.assertEqual(dict(a.to_mongo(fields=['tag', 'owner.tags'])), {
            '_id': a.pk,
            'tag': 'heavy',
            'owner': {
                'tags': ['cool', 'funny']
            }
        })
        self.assertEqual(o.to_mongo()['animal']['tag'], 'heavy')
        self.assertEqual(o.to_mongo()['animal']['owner']['tags'],
                         ['cool', 'funny'])
        # counts
        Ocorrence(person="teste 2").save()
        Ocorrence(person="teste 3").save()
        query = Ocorrence.objects(
            animal__tag='heavy', animal__owner__tags='cool')._query
        self.assertEqual(
            query, {'animal.owner.tags': 'cool', 'animal.tag': 'heavy'})
        ocorrence = Ocorrence.objects(
            animal__tag='heavy',
            animal__owner__tags='cool').first()
        self.assertEqual(ocorrence.person, "teste 2")
        self.assertIsInstance(ocorrence.animal, Animal)
--- a/tests/fields/test_complex_datetime_field.py
+++ b/tests/fields/test_complex_datetime_field.py
@@ -1,184 +0,0 @@
 # -*- coding: utf-8 -*-
 import datetime
 import math
 import itertools
 import re
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class ComplexDateTimeFieldTest(MongoDBTestCase):
    def test_complexdatetime_storage(self):
        """Tests for complex datetime fields - which can handle
        microseconds without rounding.
        """
        class LogEntry(Document):
            date = ComplexDateTimeField()
            date_with_dots = ComplexDateTimeField(separator='.')
        LogEntry.drop_collection()
        # Post UTC - microseconds are rounded (down) nearest millisecond and
        # dropped - with default datetimefields
        d1 = datetime.datetime(1970, 1, 1, 0, 0, 1, 999)
        log = LogEntry()
        log.date = d1
        log.save()
        log.reload()
        self.assertEqual(log.date, d1)
        # Post UTC - microseconds are rounded (down) nearest millisecond - with
        # default datetimefields
        d1 = datetime.datetime(1970, 1, 1, 0, 0, 1, 9999)
        log.date = d1
        log.save()
        log.reload()
        self.assertEqual(log.date, d1)
        # Pre UTC dates microseconds below 1000 are dropped - with default
        # datetimefields
        d1 = datetime.datetime(1969, 12, 31, 23, 59, 59, 999)
        log.date = d1
        log.save()
        log.reload()
        self.assertEqual(log.date, d1)
        # Pre UTC microseconds above 1000 is wonky - with default datetimefields
        # log.date has an invalid microsecond value so I can't construct
        # a date to compare.
        for i in range(1001, 3113, 33):
            d1 = datetime.datetime(1969, 12, 31, 23, 59, 59, i)
            log.date = d1
            log.save()
            log.reload()
            self.assertEqual(log.date, d1)
            log1 = LogEntry.objects.get(date=d1)
            self.assertEqual(log, log1)
        # Test string padding
        microsecond = map(int, [math.pow(10, x) for x in range(6)])
        mm = dd = hh = ii = ss = [1, 10]
        for values in itertools.product([2014], mm, dd, hh, ii, ss, microsecond):
            stored = LogEntry(date=datetime.datetime(*values)).to_mongo()['date']
            self.assertTrue(re.match('^\d{4},\d{2},\d{2},\d{2},\d{2},\d{2},\d{6}$', stored) is not None)
        # Test separator
        stored = LogEntry(date_with_dots=datetime.datetime(2014, 1, 1)).to_mongo()['date_with_dots']
        self.assertTrue(re.match('^\d{4}.\d{2}.\d{2}.\d{2}.\d{2}.\d{2}.\d{6}$', stored) is not None)
    def test_complexdatetime_usage(self):
        """Tests for complex datetime fields - which can handle
        microseconds without rounding.
        """
        class LogEntry(Document):
            date = ComplexDateTimeField()
        LogEntry.drop_collection()
        d1 = datetime.datetime(1950, 1, 1, 0, 0, 1, 999)
        log = LogEntry()
        log.date = d1
        log.save()
        log1 = LogEntry.objects.get(date=d1)
        self.assertEqual(log, log1)
        # create extra 59 log entries for a total of 60
        for i in range(1951, 2010):
            d = datetime.datetime(i, 1, 1, 0, 0, 1, 999)
            LogEntry(date=d).save()
        self.assertEqual(LogEntry.objects.count(), 60)
        # Test ordering
        logs = LogEntry.objects.order_by("date")
        i = 0
        while i < 59:
            self.assertTrue(logs[i].date <= logs[i + 1].date)
            i += 1
        logs = LogEntry.objects.order_by("-date")
        i = 0
        while i < 59:
            self.assertTrue(logs[i].date >= logs[i + 1].date)
            i += 1
        # Test searching
        logs = LogEntry.objects.filter(date__gte=datetime.datetime(1980, 1, 1))
        self.assertEqual(logs.count(), 30)
        logs = LogEntry.objects.filter(date__lte=datetime.datetime(1980, 1, 1))
        self.assertEqual(logs.count(), 30)
        logs = LogEntry.objects.filter(
            date__lte=datetime.datetime(2011, 1, 1),
            date__gte=datetime.datetime(2000, 1, 1),
        )
        self.assertEqual(logs.count(), 10)
        LogEntry.drop_collection()
        # Test microsecond-level ordering/filtering
        for microsecond in (99, 999, 9999, 10000):
            LogEntry(
                date=datetime.datetime(2015, 1, 1, 0, 0, 0, microsecond)
            ).save()
        logs = list(LogEntry.objects.order_by('date'))
        for next_idx, log in enumerate(logs[:-1], start=1):
            next_log = logs[next_idx]
            self.assertTrue(log.date < next_log.date)
        logs = list(LogEntry.objects.order_by('-date'))
        for next_idx, log in enumerate(logs[:-1], start=1):
            next_log = logs[next_idx]
            self.assertTrue(log.date > next_log.date)
        logs = LogEntry.objects.filter(
            date__lte=datetime.datetime(2015, 1, 1, 0, 0, 0, 10000))
        self.assertEqual(logs.count(), 4)
    def test_no_default_value(self):
        class Log(Document):
            timestamp = ComplexDateTimeField()
        Log.drop_collection()
        log = Log()
        self.assertIsNone(log.timestamp)
        log.save()
        fetched_log = Log.objects.with_id(log.id)
        self.assertIsNone(fetched_log.timestamp)
    def test_default_static_value(self):
        NOW = datetime.datetime.utcnow()
        class Log(Document):
            timestamp = ComplexDateTimeField(default=NOW)
        Log.drop_collection()
        log = Log()
        self.assertEqual(log.timestamp, NOW)
        log.save()
        fetched_log = Log.objects.with_id(log.id)
        self.assertEqual(fetched_log.timestamp, NOW)
    def test_default_callable(self):
        NOW = datetime.datetime.utcnow()
        class Log(Document):
            timestamp = ComplexDateTimeField(default=datetime.datetime.utcnow)
        Log.drop_collection()
        log = Log()
        self.assertGreaterEqual(log.timestamp, NOW)
        log.save()
        fetched_log = Log.objects.with_id(log.id)
        self.assertGreaterEqual(fetched_log.timestamp, NOW)
--- a/tests/fields/test_date_field.py
+++ b/tests/fields/test_date_field.py
@@ -1,165 +0,0 @@
 # -*- coding: utf-8 -*-
 import datetime
 import six
 try:
    import dateutil
 except ImportError:
    dateutil = None
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestDateField(MongoDBTestCase):
    def test_date_from_empty_string(self):
        """
        Ensure an exception is raised when trying to
        cast an empty string to datetime.
        """
        class MyDoc(Document):
            dt = DateField()
        md = MyDoc(dt='')
        self.assertRaises(ValidationError, md.save)
    def test_date_from_whitespace_string(self):
        """
        Ensure an exception is raised when trying to
        cast a whitespace-only string to datetime.
        """
        class MyDoc(Document):
            dt = DateField()
        md = MyDoc(dt='   ')
        self.assertRaises(ValidationError, md.save)
    def test_default_values_today(self):
        """Ensure that default field values are used when creating
        a document.
        """
        class Person(Document):
            day = DateField(default=datetime.date.today)
        person = Person()
        person.validate()
        self.assertEqual(person.day, person.day)
        self.assertEqual(person.day, datetime.date.today())
        self.assertEqual(person._data['day'], person.day)
    def test_date(self):
        """Tests showing pymongo date fields
        See: http://api.mongodb.org/python/current/api/bson/son.html#dt
        """
        class LogEntry(Document):
            date = DateField()
        LogEntry.drop_collection()
        # Test can save dates
        log = LogEntry()
        log.date = datetime.date.today()
        log.save()
        log.reload()
        self.assertEqual(log.date, datetime.date.today())
        d1 = datetime.datetime(1970, 1, 1, 0, 0, 1, 999)
        d2 = datetime.datetime(1970, 1, 1, 0, 0, 1)
        log = LogEntry()
        log.date = d1
        log.save()
        log.reload()
        self.assertEqual(log.date, d1.date())
        self.assertEqual(log.date, d2.date())
        d1 = datetime.datetime(1970, 1, 1, 0, 0, 1, 9999)
        d2 = datetime.datetime(1970, 1, 1, 0, 0, 1, 9000)
        log.date = d1
        log.save()
        log.reload()
        self.assertEqual(log.date, d1.date())
        self.assertEqual(log.date, d2.date())
        if not six.PY3:
            # Pre UTC dates microseconds below 1000 are dropped
            # This does not seem to be true in PY3
            d1 = datetime.datetime(1969, 12, 31, 23, 59, 59, 999)
            d2 = datetime.datetime(1969, 12, 31, 23, 59, 59)
            log.date = d1
            log.save()
            log.reload()
            self.assertEqual(log.date, d1.date())
            self.assertEqual(log.date, d2.date())
    def test_regular_usage(self):
        """Tests for regular datetime fields"""
        class LogEntry(Document):
            date = DateField()
        LogEntry.drop_collection()
        d1 = datetime.datetime(1970, 1, 1, 0, 0, 1)
        log = LogEntry()
        log.date = d1
        log.validate()
        log.save()
        for query in (d1, d1.isoformat(' ')):
            log1 = LogEntry.objects.get(date=query)
            self.assertEqual(log, log1)
        if dateutil:
            log1 = LogEntry.objects.get(date=d1.isoformat('T'))
            self.assertEqual(log, log1)
        # create additional 19 log entries for a total of 20
        for i in range(1971, 1990):
            d = datetime.datetime(i, 1, 1, 0, 0, 1)
            LogEntry(date=d).save()
        self.assertEqual(LogEntry.objects.count(), 20)
        # Test ordering
        logs = LogEntry.objects.order_by("date")
        i = 0
        while i < 19:
            self.assertTrue(logs[i].date <= logs[i + 1].date)
            i += 1
        logs = LogEntry.objects.order_by("-date")
        i = 0
        while i < 19:
            self.assertTrue(logs[i].date >= logs[i + 1].date)
            i += 1
        # Test searching
        logs = LogEntry.objects.filter(date__gte=datetime.datetime(1980, 1, 1))
        self.assertEqual(logs.count(), 10)
    def test_validation(self):
        """Ensure that invalid values cannot be assigned to datetime
        fields.
        """
        class LogEntry(Document):
            time = DateField()
        log = LogEntry()
        log.time = datetime.datetime.now()
        log.validate()
        log.time = datetime.date.today()
        log.validate()
        log.time = datetime.datetime.now().isoformat(' ')
        log.validate()
        if dateutil:
            log.time = datetime.datetime.now().isoformat('T')
            log.validate()
        log.time = -1
        self.assertRaises(ValidationError, log.validate)
        log.time = 'ABC'
        self.assertRaises(ValidationError, log.validate)
--- a/tests/fields/test_datetime_field.py
+++ b/tests/fields/test_datetime_field.py
@@ -1,231 +0,0 @@
 # -*- coding: utf-8 -*-
 import datetime as dt
 import six
 try:
    import dateutil
 except ImportError:
    dateutil = None
 from mongoengine import *
 from mongoengine import connection
 from tests.utils import MongoDBTestCase
 class TestDateTimeField(MongoDBTestCase):
    def test_datetime_from_empty_string(self):
        """
        Ensure an exception is raised when trying to
        cast an empty string to datetime.
        """
        class MyDoc(Document):
            dt = DateTimeField()
        md = MyDoc(dt='')
        self.assertRaises(ValidationError, md.save)
    def test_datetime_from_whitespace_string(self):
        """
        Ensure an exception is raised when trying to
        cast a whitespace-only string to datetime.
        """
        class MyDoc(Document):
            dt = DateTimeField()
        md = MyDoc(dt='   ')
        self.assertRaises(ValidationError, md.save)
    def test_default_value_utcnow(self):
        """Ensure that default field values are used when creating
        a document.
        """
        class Person(Document):
            created = DateTimeField(default=dt.datetime.utcnow)
        utcnow = dt.datetime.utcnow()
        person = Person()
        person.validate()
        person_created_t0 = person.created
        self.assertLess(person.created - utcnow, dt.timedelta(seconds=1))
        self.assertEqual(person_created_t0, person.created)  # make sure it does not change
        self.assertEqual(person._data['created'], person.created)
    def test_handling_microseconds(self):
        """Tests showing pymongo datetime fields handling of microseconds.
        Microseconds are rounded to the nearest millisecond and pre UTC
        handling is wonky.
        See: http://api.mongodb.org/python/current/api/bson/son.html#dt
        """
        class LogEntry(Document):
            date = DateTimeField()
        LogEntry.drop_collection()
        # Test can save dates
        log = LogEntry()
        log.date = dt.date.today()
        log.save()
        log.reload()
        self.assertEqual(log.date.date(), dt.date.today())
        # Post UTC - microseconds are rounded (down) nearest millisecond and
        # dropped
        d1 = dt.datetime(1970, 1, 1, 0, 0, 1, 999)
        d2 = dt.datetime(1970, 1, 1, 0, 0, 1)
        log = LogEntry()
        log.date = d1
        log.save()
        log.reload()
        self.assertNotEqual(log.date, d1)
        self.assertEqual(log.date, d2)
        # Post UTC - microseconds are rounded (down) nearest millisecond
        d1 = dt.datetime(1970, 1, 1, 0, 0, 1, 9999)
        d2 = dt.datetime(1970, 1, 1, 0, 0, 1, 9000)
        log.date = d1
        log.save()
        log.reload()
        self.assertNotEqual(log.date, d1)
        self.assertEqual(log.date, d2)
        if not six.PY3:
            # Pre UTC dates microseconds below 1000 are dropped
            # This does not seem to be true in PY3
            d1 = dt.datetime(1969, 12, 31, 23, 59, 59, 999)
            d2 = dt.datetime(1969, 12, 31, 23, 59, 59)
            log.date = d1
            log.save()
            log.reload()
            self.assertNotEqual(log.date, d1)
            self.assertEqual(log.date, d2)
    def test_regular_usage(self):
        """Tests for regular datetime fields"""
        class LogEntry(Document):
            date = DateTimeField()
        LogEntry.drop_collection()
        d1 = dt.datetime(1970, 1, 1, 0, 0, 1)
        log = LogEntry()
        log.date = d1
        log.validate()
        log.save()
        for query in (d1, d1.isoformat(' ')):
            log1 = LogEntry.objects.get(date=query)
            self.assertEqual(log, log1)
        if dateutil:
            log1 = LogEntry.objects.get(date=d1.isoformat('T'))
            self.assertEqual(log, log1)
        # create additional 19 log entries for a total of 20
        for i in range(1971, 1990):
            d = dt.datetime(i, 1, 1, 0, 0, 1)
            LogEntry(date=d).save()
        self.assertEqual(LogEntry.objects.count(), 20)
        # Test ordering
        logs = LogEntry.objects.order_by("date")
        i = 0
        while i < 19:
            self.assertTrue(logs[i].date <= logs[i + 1].date)
            i += 1
        logs = LogEntry.objects.order_by("-date")
        i = 0
        while i < 19:
            self.assertTrue(logs[i].date >= logs[i + 1].date)
            i += 1
        # Test searching
        logs = LogEntry.objects.filter(date__gte=dt.datetime(1980, 1, 1))
        self.assertEqual(logs.count(), 10)
        logs = LogEntry.objects.filter(date__lte=dt.datetime(1980, 1, 1))
        self.assertEqual(logs.count(), 10)
        logs = LogEntry.objects.filter(
            date__lte=dt.datetime(1980, 1, 1),
            date__gte=dt.datetime(1975, 1, 1),
        )
        self.assertEqual(logs.count(), 5)
    def test_datetime_validation(self):
        """Ensure that invalid values cannot be assigned to datetime
        fields.
        """
        class LogEntry(Document):
            time = DateTimeField()
        log = LogEntry()
        log.time = dt.datetime.now()
        log.validate()
        log.time = dt.date.today()
        log.validate()
        log.time = dt.datetime.now().isoformat(' ')
        log.validate()
        log.time = '2019-05-16 21:42:57.897847'
        log.validate()
        if dateutil:
            log.time = dt.datetime.now().isoformat('T')
            log.validate()
        log.time = -1
        self.assertRaises(ValidationError, log.validate)
        log.time = 'ABC'
        self.assertRaises(ValidationError, log.validate)
        log.time = '2019-05-16 21:GARBAGE:12'
        self.assertRaises(ValidationError, log.validate)
        log.time = '2019-05-16 21:42:57.GARBAGE'
        self.assertRaises(ValidationError, log.validate)
        log.time = '2019-05-16 21:42:57.123.456'
        self.assertRaises(ValidationError, log.validate)
    def test_parse_datetime_as_str(self):
        class DTDoc(Document):
            date = DateTimeField()
        date_str = '2019-03-02 22:26:01'
        # make sure that passing a parsable datetime works
        dtd = DTDoc()
        dtd.date = date_str
        self.assertIsInstance(dtd.date, six.string_types)
        dtd.save()
        dtd.reload()
        self.assertIsInstance(dtd.date, dt.datetime)
        self.assertEqual(str(dtd.date), date_str)
        dtd.date = 'January 1st, 9999999999'
        self.assertRaises(ValidationError, dtd.validate)
 class TestDateTimeTzAware(MongoDBTestCase):
    def test_datetime_tz_aware_mark_as_changed(self):
        # Reset the connections
        connection._connection_settings = {}
        connection._connections = {}
        connection._dbs = {}
        connect(db='mongoenginetest', tz_aware=True)
        class LogEntry(Document):
            time = DateTimeField()
        LogEntry.drop_collection()
        LogEntry(time=dt.datetime(2013, 1, 1, 0, 0, 0)).save()
        log = LogEntry.objects.first()
        log.time = dt.datetime(2013, 1, 1, 0, 0, 0)
        self.assertEqual(['time'], log._changed_fields)
--- a/tests/fields/test_decimal_field.py
+++ b/tests/fields/test_decimal_field.py
@@ -1,91 +0,0 @@
 # -*- coding: utf-8 -*-
 from decimal import Decimal
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestDecimalField(MongoDBTestCase):
    def test_validation(self):
        """Ensure that invalid values cannot be assigned to decimal fields.
        """
        class Person(Document):
            height = DecimalField(min_value=Decimal('0.1'),
                                  max_value=Decimal('3.5'))
        Person.drop_collection()
        Person(height=Decimal('1.89')).save()
        person = Person.objects.first()
        self.assertEqual(person.height, Decimal('1.89'))
        person.height = '2.0'
        person.save()
        person.height = 0.01
        self.assertRaises(ValidationError, person.validate)
        person.height = Decimal('0.01')
        self.assertRaises(ValidationError, person.validate)
        person.height = Decimal('4.0')
        self.assertRaises(ValidationError, person.validate)
        person.height = 'something invalid'
        self.assertRaises(ValidationError, person.validate)
        person_2 = Person(height='something invalid')
        self.assertRaises(ValidationError, person_2.validate)
    def test_comparison(self):
        class Person(Document):
            money = DecimalField()
        Person.drop_collection()
        Person(money=6).save()
        Person(money=7).save()
        Person(money=8).save()
        Person(money=10).save()
        self.assertEqual(2, Person.objects(money__gt=Decimal("7")).count())
        self.assertEqual(2, Person.objects(money__gt=7).count())
        self.assertEqual(2, Person.objects(money__gt="7").count())
        self.assertEqual(3, Person.objects(money__gte="7").count())
    def test_storage(self):
        class Person(Document):
            float_value = DecimalField(precision=4)
            string_value = DecimalField(precision=4, force_string=True)
        Person.drop_collection()
        values_to_store = [10, 10.1, 10.11, "10.111", Decimal("10.1111"), Decimal("10.11111")]
        for store_at_creation in [True, False]:
            for value in values_to_store:
                # to_python is called explicitly if values were sent in the kwargs of __init__
                if store_at_creation:
                    Person(float_value=value, string_value=value).save()
                else:
                    person = Person.objects.create()
                    person.float_value = value
                    person.string_value = value
                    person.save()
        # How its stored
        expected = [
            {'float_value': 10.0, 'string_value': '10.0000'},
            {'float_value': 10.1, 'string_value': '10.1000'},
            {'float_value': 10.11, 'string_value': '10.1100'},
            {'float_value': 10.111, 'string_value': '10.1110'},
            {'float_value': 10.1111, 'string_value': '10.1111'},
            {'float_value': 10.1111, 'string_value': '10.1111'}]
        expected.extend(expected)
        actual = list(Person.objects.exclude('id').as_pymongo())
        self.assertEqual(expected, actual)
        # How it comes out locally
        expected = [Decimal('10.0000'), Decimal('10.1000'), Decimal('10.1100'),
                    Decimal('10.1110'), Decimal('10.1111'), Decimal('10.1111')]
        expected.extend(expected)
        for field_name in ['float_value', 'string_value']:
            actual = list(Person.objects().scalar(field_name))
            self.assertEqual(expected, actual)
--- a/tests/fields/test_dict_field.py
+++ b/tests/fields/test_dict_field.py
@@ -1,324 +0,0 @@
 # -*- coding: utf-8 -*-
 from mongoengine import *
 from mongoengine.base import BaseDict
 from tests.utils import MongoDBTestCase, get_as_pymongo
 class TestDictField(MongoDBTestCase):
    def test_storage(self):
        class BlogPost(Document):
            info = DictField()
        BlogPost.drop_collection()
        info = {'testkey': 'testvalue'}
        post = BlogPost(info=info).save()
        self.assertEqual(
            get_as_pymongo(post),
            {
                '_id': post.id,
                'info': info
            }
        )
    def test_general_things(self):
        """Ensure that dict types work as expected."""
        class BlogPost(Document):
            info = DictField()
        BlogPost.drop_collection()
        post = BlogPost()
        post.info = 'my post'
        self.assertRaises(ValidationError, post.validate)
        post.info = ['test', 'test']
        self.assertRaises(ValidationError, post.validate)
        post.info = {'$title': 'test'}
        self.assertRaises(ValidationError, post.validate)
        post.info = {'nested': {'$title': 'test'}}
        self.assertRaises(ValidationError, post.validate)
        post.info = {'the.title': 'test'}
        self.assertRaises(ValidationError, post.validate)
        post.info = {'nested': {'the.title': 'test'}}
        self.assertRaises(ValidationError, post.validate)
        post.info = {1: 'test'}
        self.assertRaises(ValidationError, post.validate)
        post.info = {'title': 'test'}
        post.save()
        post = BlogPost()
        post.info = {'title': 'dollar_sign', 'details': {'te$t': 'test'}}
        post.save()
        post = BlogPost()
        post.info = {'details': {'test': 'test'}}
        post.save()
        post = BlogPost()
        post.info = {'details': {'test': 3}}
        post.save()
        self.assertEqual(BlogPost.objects.count(), 4)
        self.assertEqual(
            BlogPost.objects.filter(info__title__exact='test').count(), 1)
        self.assertEqual(
            BlogPost.objects.filter(info__details__test__exact='test').count(), 1)
        post = BlogPost.objects.filter(info__title__exact='dollar_sign').first()
        self.assertIn('te$t', post['info']['details'])
        # Confirm handles non strings or non existing keys
        self.assertEqual(
            BlogPost.objects.filter(info__details__test__exact=5).count(), 0)
        self.assertEqual(
            BlogPost.objects.filter(info__made_up__test__exact='test').count(), 0)
        post = BlogPost.objects.create(info={'title': 'original'})
        post.info.update({'title': 'updated'})
        post.save()
        post.reload()
        self.assertEqual('updated', post.info['title'])
        post.info.setdefault('authors', [])
        post.save()
        post.reload()
        self.assertEqual([], post.info['authors'])
    def test_dictfield_dump_document(self):
        """Ensure a DictField can handle another document's dump."""
        class Doc(Document):
            field = DictField()
        class ToEmbed(Document):
            id = IntField(primary_key=True, default=1)
            recursive = DictField()
        class ToEmbedParent(Document):
            id = IntField(primary_key=True, default=1)
            recursive = DictField()
            meta = {'allow_inheritance': True}
        class ToEmbedChild(ToEmbedParent):
            pass
        to_embed_recursive = ToEmbed(id=1).save()
        to_embed = ToEmbed(
            id=2, recursive=to_embed_recursive.to_mongo().to_dict()).save()
        doc = Doc(field=to_embed.to_mongo().to_dict())
        doc.save()
        self.assertIsInstance(doc.field, dict)
        self.assertEqual(doc.field, {'_id': 2, 'recursive': {'_id': 1, 'recursive': {}}})
        # Same thing with a Document with a _cls field
        to_embed_recursive = ToEmbedChild(id=1).save()
        to_embed_child = ToEmbedChild(
            id=2, recursive=to_embed_recursive.to_mongo().to_dict()).save()
        doc = Doc(field=to_embed_child.to_mongo().to_dict())
        doc.save()
        self.assertIsInstance(doc.field, dict)
        expected = {
            '_id': 2, '_cls': 'ToEmbedParent.ToEmbedChild',
            'recursive': {'_id': 1, '_cls': 'ToEmbedParent.ToEmbedChild', 'recursive': {}}
        }
        self.assertEqual(doc.field, expected)
    def test_dictfield_strict(self):
        """Ensure that dict field handles validation if provided a strict field type."""
        class Simple(Document):
            mapping = DictField(field=IntField())
        Simple.drop_collection()
        e = Simple()
        e.mapping['someint'] = 1
        e.save()
        # try creating an invalid mapping
        with self.assertRaises(ValidationError):
            e.mapping['somestring'] = "abc"
            e.save()
    def test_dictfield_complex(self):
        """Ensure that the dict field can handle the complex types."""
        class SettingBase(EmbeddedDocument):
            meta = {'allow_inheritance': True}
        class StringSetting(SettingBase):
            value = StringField()
        class IntegerSetting(SettingBase):
            value = IntField()
        class Simple(Document):
            mapping = DictField()
        Simple.drop_collection()
        e = Simple()
        e.mapping['somestring'] = StringSetting(value='foo')
        e.mapping['someint'] = IntegerSetting(value=42)
        e.mapping['nested_dict'] = {'number': 1, 'string': 'Hi!',
                                    'float': 1.001,
                                    'complex': IntegerSetting(value=42),
                                    'list': [IntegerSetting(value=42),
                                             StringSetting(value='foo')]}
        e.save()
        e2 = Simple.objects.get(id=e.id)
        self.assertIsInstance(e2.mapping['somestring'], StringSetting)
        self.assertIsInstance(e2.mapping['someint'], IntegerSetting)
        # Test querying
        self.assertEqual(
            Simple.objects.filter(mapping__someint__value=42).count(), 1)
        self.assertEqual(
            Simple.objects.filter(mapping__nested_dict__number=1).count(), 1)
        self.assertEqual(
            Simple.objects.filter(mapping__nested_dict__complex__value=42).count(), 1)
        self.assertEqual(
            Simple.objects.filter(mapping__nested_dict__list__0__value=42).count(), 1)
        self.assertEqual(
            Simple.objects.filter(mapping__nested_dict__list__1__value='foo').count(), 1)
        # Confirm can update
        Simple.objects().update(
            set__mapping={"someint": IntegerSetting(value=10)})
        Simple.objects().update(
            set__mapping__nested_dict__list__1=StringSetting(value='Boo'))
        self.assertEqual(
            Simple.objects.filter(mapping__nested_dict__list__1__value='foo').count(), 0)
        self.assertEqual(
            Simple.objects.filter(mapping__nested_dict__list__1__value='Boo').count(), 1)
    def test_push_dict(self):
        class MyModel(Document):
            events = ListField(DictField())
        doc = MyModel(events=[{'a': 1}]).save()
        raw_doc = get_as_pymongo(doc)
        expected_raw_doc = {
            '_id': doc.id,
            'events': [{'a': 1}]
        }
        self.assertEqual(raw_doc, expected_raw_doc)
        MyModel.objects(id=doc.id).update(push__events={})
        raw_doc = get_as_pymongo(doc)
        expected_raw_doc = {
            '_id': doc.id,
            'events': [{'a': 1}, {}]
        }
        self.assertEqual(raw_doc, expected_raw_doc)
    def test_ensure_unique_default_instances(self):
        """Ensure that every field has it's own unique default instance."""
        class D(Document):
            data = DictField()
            data2 = DictField(default=lambda: {})
        d1 = D()
        d1.data['foo'] = 'bar'
        d1.data2['foo'] = 'bar'
        d2 = D()
        self.assertEqual(d2.data, {})
        self.assertEqual(d2.data2, {})
    def test_dict_field_invalid_dict_value(self):
        class DictFieldTest(Document):
            dictionary = DictField(required=True)
        DictFieldTest.drop_collection()
        test = DictFieldTest(dictionary=None)
        test.dictionary  # Just access to test getter
        self.assertRaises(ValidationError, test.validate)
        test = DictFieldTest(dictionary=False)
        test.dictionary  # Just access to test getter
        self.assertRaises(ValidationError, test.validate)
    def test_dict_field_raises_validation_error_if_wrongly_assign_embedded_doc(self):
        class DictFieldTest(Document):
            dictionary = DictField(required=True)
        DictFieldTest.drop_collection()
        class Embedded(EmbeddedDocument):
            name = StringField()
        embed = Embedded(name='garbage')
        doc = DictFieldTest(dictionary=embed)
        with self.assertRaises(ValidationError) as ctx_err:
            doc.validate()
        self.assertIn("'dictionary'", str(ctx_err.exception))
        self.assertIn('Only dictionaries may be used in a DictField', str(ctx_err.exception))
    def test_atomic_update_dict_field(self):
        """Ensure that the entire DictField can be atomically updated."""
        class Simple(Document):
            mapping = DictField(field=ListField(IntField(required=True)))
        Simple.drop_collection()
        e = Simple()
        e.mapping['someints'] = [1, 2]
        e.save()
        e.update(set__mapping={"ints": [3, 4]})
        e.reload()
        self.assertEqual(BaseDict, type(e.mapping))
        self.assertEqual({"ints": [3, 4]}, e.mapping)
        # try creating an invalid mapping
        with self.assertRaises(ValueError):
            e.update(set__mapping={"somestrings": ["foo", "bar", ]})
    def test_dictfield_with_referencefield_complex_nesting_cases(self):
        """Ensure complex nesting inside DictField handles dereferencing of ReferenceField(dbref=True | False)"""
        # Relates to Issue #1453
        class Doc(Document):
            s = StringField()
        class Simple(Document):
            mapping0 = DictField(ReferenceField(Doc, dbref=True))
            mapping1 = DictField(ReferenceField(Doc, dbref=False))
            mapping2 = DictField(ListField(ReferenceField(Doc, dbref=True)))
            mapping3 = DictField(ListField(ReferenceField(Doc, dbref=False)))
            mapping4 = DictField(DictField(field=ReferenceField(Doc, dbref=True)))
            mapping5 = DictField(DictField(field=ReferenceField(Doc, dbref=False)))
            mapping6 = DictField(ListField(DictField(ReferenceField(Doc, dbref=True))))
            mapping7 = DictField(ListField(DictField(ReferenceField(Doc, dbref=False))))
            mapping8 = DictField(ListField(DictField(ListField(ReferenceField(Doc, dbref=True)))))
            mapping9 = DictField(ListField(DictField(ListField(ReferenceField(Doc, dbref=False)))))
        Doc.drop_collection()
        Simple.drop_collection()
        d = Doc(s='aa').save()
        e = Simple()
        e.mapping0['someint'] = e.mapping1['someint'] = d
        e.mapping2['someint'] = e.mapping3['someint'] = [d]
        e.mapping4['someint'] = e.mapping5['someint'] = {'d': d}
        e.mapping6['someint'] = e.mapping7['someint'] = [{'d': d}]
        e.mapping8['someint'] = e.mapping9['someint'] = [{'d': [d]}]
        e.save()
        s = Simple.objects.first()
        self.assertIsInstance(s.mapping0['someint'], Doc)
        self.assertIsInstance(s.mapping1['someint'], Doc)
        self.assertIsInstance(s.mapping2['someint'][0], Doc)
        self.assertIsInstance(s.mapping3['someint'][0], Doc)
        self.assertIsInstance(s.mapping4['someint']['d'], Doc)
        self.assertIsInstance(s.mapping5['someint']['d'], Doc)
        self.assertIsInstance(s.mapping6['someint'][0]['d'], Doc)
        self.assertIsInstance(s.mapping7['someint'][0]['d'], Doc)
        self.assertIsInstance(s.mapping8['someint'][0]['d'][0], Doc)
        self.assertIsInstance(s.mapping9['someint'][0]['d'][0], Doc)
--- a/tests/fields/test_email_field.py
+++ b/tests/fields/test_email_field.py
@@ -1,130 +0,0 @@
 # -*- coding: utf-8 -*-
 import sys
 from unittest import SkipTest
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestEmailField(MongoDBTestCase):
    def test_generic_behavior(self):
        class User(Document):
            email = EmailField()
        user = User(email='ross@example.com')
        user.validate()
        user = User(email='ross@example.co.uk')
        user.validate()
        user = User(email=('Kofq@rhom0e4klgauOhpbpNdogawnyIKvQS0wk2mjqrgGQ5S'
                           'aJIazqqWkm7.net'))
        user.validate()
        user = User(email='new-tld@example.technology')
        user.validate()
        user = User(email='ross@example.com.')
        self.assertRaises(ValidationError, user.validate)
        # unicode domain
        user = User(email=u'user@пример.рф')
        user.validate()
        # invalid unicode domain
        user = User(email=u'user@пример')
        self.assertRaises(ValidationError, user.validate)
        # invalid data type
        user = User(email=123)
        self.assertRaises(ValidationError, user.validate)
    def test_email_field_unicode_user(self):
        # Don't run this test on pypy3, which doesn't support unicode regex:
        # https://bitbucket.org/pypy/pypy/issues/1821/regular-expression-doesnt-find-unicode
        if sys.version_info[:2] == (3, 2):
            raise SkipTest('unicode email addresses are not supported on PyPy 3')
        class User(Document):
            email = EmailField()
        # unicode user shouldn't validate by default...
        user = User(email=u'Dörte@Sörensen.example.com')
        self.assertRaises(ValidationError, user.validate)
        # ...but it should be fine with allow_utf8_user set to True
        class User(Document):
            email = EmailField(allow_utf8_user=True)
        user = User(email=u'Dörte@Sörensen.example.com')
        user.validate()
    def test_email_field_domain_whitelist(self):
        class User(Document):
            email = EmailField()
        # localhost domain shouldn't validate by default...
        user = User(email='me@localhost')
        self.assertRaises(ValidationError, user.validate)
        # ...but it should be fine if it's whitelisted
        class User(Document):
            email = EmailField(domain_whitelist=['localhost'])
        user = User(email='me@localhost')
        user.validate()
    def test_email_domain_validation_fails_if_invalid_idn(self):
        class User(Document):
            email = EmailField()
        invalid_idn = '.google.com'
        user = User(email='me@%s' % invalid_idn)
        with self.assertRaises(ValidationError) as ctx_err:
            user.validate()
        self.assertIn("domain failed IDN encoding", str(ctx_err.exception))
    def test_email_field_ip_domain(self):
        class User(Document):
            email = EmailField()
        valid_ipv4 = 'email@[127.0.0.1]'
        valid_ipv6 = 'email@[2001:dB8::1]'
        invalid_ip = 'email@[324.0.0.1]'
        # IP address as a domain shouldn't validate by default...
        user = User(email=valid_ipv4)
        self.assertRaises(ValidationError, user.validate)
        user = User(email=valid_ipv6)
        self.assertRaises(ValidationError, user.validate)
        user = User(email=invalid_ip)
        self.assertRaises(ValidationError, user.validate)
        # ...but it should be fine with allow_ip_domain set to True
        class User(Document):
            email = EmailField(allow_ip_domain=True)
        user = User(email=valid_ipv4)
        user.validate()
        user = User(email=valid_ipv6)
        user.validate()
        # invalid IP should still fail validation
        user = User(email=invalid_ip)
        self.assertRaises(ValidationError, user.validate)
    def test_email_field_honors_regex(self):
        class User(Document):
            email = EmailField(regex=r'\w+@example.com')
        # Fails regex validation
        user = User(email='me@foo.com')
        self.assertRaises(ValidationError, user.validate)
        # Passes regex validation
        user = User(email='me@example.com')
        self.assertIsNone(user.validate())
--- a/tests/fields/test_embedded_document_field.py
+++ b/tests/fields/test_embedded_document_field.py
@@ -1,344 +0,0 @@
 # -*- coding: utf-8 -*-
 from mongoengine import Document, StringField, ValidationError, EmbeddedDocument, EmbeddedDocumentField, \
    InvalidQueryError, LookUpError, IntField, GenericEmbeddedDocumentField, ListField, EmbeddedDocumentListField, \
    ReferenceField
 from tests.utils import MongoDBTestCase
 class TestEmbeddedDocumentField(MongoDBTestCase):
    def test___init___(self):
        class MyDoc(EmbeddedDocument):
            name = StringField()
        field = EmbeddedDocumentField(MyDoc)
        self.assertEqual(field.document_type_obj, MyDoc)
        field2 = EmbeddedDocumentField('MyDoc')
        self.assertEqual(field2.document_type_obj, 'MyDoc')
    def test___init___throw_error_if_document_type_is_not_EmbeddedDocument(self):
        with self.assertRaises(ValidationError):
            EmbeddedDocumentField(dict)
    def test_document_type_throw_error_if_not_EmbeddedDocument_subclass(self):
        class MyDoc(Document):
            name = StringField()
        emb = EmbeddedDocumentField('MyDoc')
        with self.assertRaises(ValidationError) as ctx:
            emb.document_type
        self.assertIn('Invalid embedded document class provided to an EmbeddedDocumentField', str(ctx.exception))
    def test_embedded_document_field_only_allow_subclasses_of_embedded_document(self):
        # Relates to #1661
        class MyDoc(Document):
            name = StringField()
        with self.assertRaises(ValidationError):
            class MyFailingDoc(Document):
                emb = EmbeddedDocumentField(MyDoc)
        with self.assertRaises(ValidationError):
            class MyFailingdoc2(Document):
                emb = EmbeddedDocumentField('MyDoc')
    def test_query_embedded_document_attribute(self):
        class AdminSettings(EmbeddedDocument):
            foo1 = StringField()
            foo2 = StringField()
        class Person(Document):
            settings = EmbeddedDocumentField(AdminSettings)
            name = StringField()
        Person.drop_collection()
        p = Person(
            settings=AdminSettings(foo1='bar1', foo2='bar2'),
            name='John',
        ).save()
        # Test non exiting attribute
        with self.assertRaises(InvalidQueryError) as ctx_err:
            Person.objects(settings__notexist='bar').first()
        self.assertEqual(unicode(ctx_err.exception), u'Cannot resolve field "notexist"')
        with self.assertRaises(LookUpError):
            Person.objects.only('settings.notexist')
        # Test existing attribute
        self.assertEqual(Person.objects(settings__foo1='bar1').first().id, p.id)
        only_p = Person.objects.only('settings.foo1').first()
        self.assertEqual(only_p.settings.foo1, p.settings.foo1)
        self.assertIsNone(only_p.settings.foo2)
        self.assertIsNone(only_p.name)
        exclude_p = Person.objects.exclude('settings.foo1').first()
        self.assertIsNone(exclude_p.settings.foo1)
        self.assertEqual(exclude_p.settings.foo2, p.settings.foo2)
        self.assertEqual(exclude_p.name, p.name)
    def test_query_embedded_document_attribute_with_inheritance(self):
        class BaseSettings(EmbeddedDocument):
            meta = {'allow_inheritance': True}
            base_foo = StringField()
        class AdminSettings(BaseSettings):
            sub_foo = StringField()
        class Person(Document):
            settings = EmbeddedDocumentField(BaseSettings)
        Person.drop_collection()
        p = Person(settings=AdminSettings(base_foo='basefoo', sub_foo='subfoo'))
        p.save()
        # Test non exiting attribute
        with self.assertRaises(InvalidQueryError) as ctx_err:
            self.assertEqual(Person.objects(settings__notexist='bar').first().id, p.id)
        self.assertEqual(unicode(ctx_err.exception), u'Cannot resolve field "notexist"')
        # Test existing attribute
        self.assertEqual(Person.objects(settings__base_foo='basefoo').first().id, p.id)
        self.assertEqual(Person.objects(settings__sub_foo='subfoo').first().id, p.id)
        only_p = Person.objects.only('settings.base_foo', 'settings._cls').first()
        self.assertEqual(only_p.settings.base_foo, 'basefoo')
        self.assertIsNone(only_p.settings.sub_foo)
    def test_query_list_embedded_document_with_inheritance(self):
        class Post(EmbeddedDocument):
            title = StringField(max_length=120, required=True)
            meta = {'allow_inheritance': True}
        class TextPost(Post):
            content = StringField()
        class MoviePost(Post):
            author = StringField()
        class Record(Document):
            posts = ListField(EmbeddedDocumentField(Post))
        record_movie = Record(posts=[MoviePost(author='John', title='foo')]).save()
        record_text = Record(posts=[TextPost(content='a', title='foo')]).save()
        records = list(Record.objects(posts__author=record_movie.posts[0].author))
        self.assertEqual(len(records), 1)
        self.assertEqual(records[0].id, record_movie.id)
        records = list(Record.objects(posts__content=record_text.posts[0].content))
        self.assertEqual(len(records), 1)
        self.assertEqual(records[0].id, record_text.id)
        self.assertEqual(Record.objects(posts__title='foo').count(), 2)
 class TestGenericEmbeddedDocumentField(MongoDBTestCase):
    def test_generic_embedded_document(self):
        class Car(EmbeddedDocument):
            name = StringField()
        class Dish(EmbeddedDocument):
            food = StringField(required=True)
            number = IntField()
        class Person(Document):
            name = StringField()
            like = GenericEmbeddedDocumentField()
        Person.drop_collection()
        person = Person(name='Test User')
        person.like = Car(name='Fiat')
        person.save()
        person = Person.objects.first()
        self.assertIsInstance(person.like, Car)
        person.like = Dish(food="arroz", number=15)
        person.save()
        person = Person.objects.first()
        self.assertIsInstance(person.like, Dish)
    def test_generic_embedded_document_choices(self):
        """Ensure you can limit GenericEmbeddedDocument choices."""
        class Car(EmbeddedDocument):
            name = StringField()
        class Dish(EmbeddedDocument):
            food = StringField(required=True)
            number = IntField()
        class Person(Document):
            name = StringField()
            like = GenericEmbeddedDocumentField(choices=(Dish,))
        Person.drop_collection()
        person = Person(name='Test User')
        person.like = Car(name='Fiat')
        self.assertRaises(ValidationError, person.validate)
        person.like = Dish(food="arroz", number=15)
        person.save()
        person = Person.objects.first()
        self.assertIsInstance(person.like, Dish)
    def test_generic_list_embedded_document_choices(self):
        """Ensure you can limit GenericEmbeddedDocument choices inside
        a list field.
        """
        class Car(EmbeddedDocument):
            name = StringField()
        class Dish(EmbeddedDocument):
            food = StringField(required=True)
            number = IntField()
        class Person(Document):
            name = StringField()
            likes = ListField(GenericEmbeddedDocumentField(choices=(Dish,)))
        Person.drop_collection()
        person = Person(name='Test User')
        person.likes = [Car(name='Fiat')]
        self.assertRaises(ValidationError, person.validate)
        person.likes = [Dish(food="arroz", number=15)]
        person.save()
        person = Person.objects.first()
        self.assertIsInstance(person.likes[0], Dish)
    def test_choices_validation_documents(self):
        """
        Ensure fields with document choices validate given a valid choice.
        """
        class UserComments(EmbeddedDocument):
            author = StringField()
            message = StringField()
        class BlogPost(Document):
            comments = ListField(
                GenericEmbeddedDocumentField(choices=(UserComments,))
            )
        # Ensure Validation Passes
        BlogPost(comments=[
            UserComments(author='user2', message='message2'),
        ]).save()
    def test_choices_validation_documents_invalid(self):
        """
        Ensure fields with document choices validate given an invalid choice.
        This should throw a ValidationError exception.
        """
        class UserComments(EmbeddedDocument):
            author = StringField()
            message = StringField()
        class ModeratorComments(EmbeddedDocument):
            author = StringField()
            message = StringField()
        class BlogPost(Document):
            comments = ListField(
                GenericEmbeddedDocumentField(choices=(UserComments,))
            )
        # Single Entry Failure
        post = BlogPost(comments=[
            ModeratorComments(author='mod1', message='message1'),
        ])
        self.assertRaises(ValidationError, post.save)
        # Mixed Entry Failure
        post = BlogPost(comments=[
            ModeratorComments(author='mod1', message='message1'),
            UserComments(author='user2', message='message2'),
        ])
        self.assertRaises(ValidationError, post.save)
    def test_choices_validation_documents_inheritance(self):
        """
        Ensure fields with document choices validate given subclass of choice.
        """
        class Comments(EmbeddedDocument):
            meta = {
                'abstract': True
            }
            author = StringField()
            message = StringField()
        class UserComments(Comments):
            pass
        class BlogPost(Document):
            comments = ListField(
                GenericEmbeddedDocumentField(choices=(Comments,))
            )
        # Save Valid EmbeddedDocument Type
        BlogPost(comments=[
            UserComments(author='user2', message='message2'),
        ]).save()
    def test_query_generic_embedded_document_attribute(self):
        class AdminSettings(EmbeddedDocument):
            foo1 = StringField()
        class NonAdminSettings(EmbeddedDocument):
            foo2 = StringField()
        class Person(Document):
            settings = GenericEmbeddedDocumentField(choices=(AdminSettings, NonAdminSettings))
        Person.drop_collection()
        p1 = Person(settings=AdminSettings(foo1='bar1')).save()
        p2 = Person(settings=NonAdminSettings(foo2='bar2')).save()
        # Test non exiting attribute
        with self.assertRaises(InvalidQueryError) as ctx_err:
            Person.objects(settings__notexist='bar').first()
        self.assertEqual(unicode(ctx_err.exception), u'Cannot resolve field "notexist"')
        with self.assertRaises(LookUpError):
            Person.objects.only('settings.notexist')
        # Test existing attribute
        self.assertEqual(Person.objects(settings__foo1='bar1').first().id, p1.id)
        self.assertEqual(Person.objects(settings__foo2='bar2').first().id, p2.id)
    def test_query_generic_embedded_document_attribute_with_inheritance(self):
        class BaseSettings(EmbeddedDocument):
            meta = {'allow_inheritance': True}
            base_foo = StringField()
        class AdminSettings(BaseSettings):
            sub_foo = StringField()
        class Person(Document):
            settings = GenericEmbeddedDocumentField(choices=[BaseSettings])
        Person.drop_collection()
        p = Person(settings=AdminSettings(base_foo='basefoo', sub_foo='subfoo'))
        p.save()
        # Test non exiting attribute
        with self.assertRaises(InvalidQueryError) as ctx_err:
            self.assertEqual(Person.objects(settings__notexist='bar').first().id, p.id)
        self.assertEqual(unicode(ctx_err.exception), u'Cannot resolve field "notexist"')
        # Test existing attribute
        self.assertEqual(Person.objects(settings__base_foo='basefoo').first().id, p.id)
        self.assertEqual(Person.objects(settings__sub_foo='subfoo').first().id, p.id)
--- a/tests/fields/test_float_field.py
+++ b/tests/fields/test_float_field.py
@@ -1,58 +0,0 @@
 # -*- coding: utf-8 -*-
 import six
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestFloatField(MongoDBTestCase):
    def test_float_ne_operator(self):
        class TestDocument(Document):
            float_fld = FloatField()
        TestDocument.drop_collection()
        TestDocument(float_fld=None).save()
        TestDocument(float_fld=1).save()
        self.assertEqual(1, TestDocument.objects(float_fld__ne=None).count())
        self.assertEqual(1, TestDocument.objects(float_fld__ne=1).count())
    def test_validation(self):
        """Ensure that invalid values cannot be assigned to float fields.
        """
        class Person(Document):
            height = FloatField(min_value=0.1, max_value=3.5)
        class BigPerson(Document):
            height = FloatField()
        person = Person()
        person.height = 1.89
        person.validate()
        person.height = '2.0'
        self.assertRaises(ValidationError, person.validate)
        person.height = 0.01
        self.assertRaises(ValidationError, person.validate)
        person.height = 4.0
        self.assertRaises(ValidationError, person.validate)
        person_2 = Person(height='something invalid')
        self.assertRaises(ValidationError, person_2.validate)
        big_person = BigPerson()
        for value, value_type in enumerate(six.integer_types):
            big_person.height = value_type(value)
            big_person.validate()
        big_person.height = 2 ** 500
        big_person.validate()
        big_person.height = 2 ** 100000  # Too big for a float value
        self.assertRaises(ValidationError, big_person.validate)
--- a/tests/fields/test_int_field.py
+++ b/tests/fields/test_int_field.py
@@ -1,42 +0,0 @@
 # -*- coding: utf-8 -*-
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestIntField(MongoDBTestCase):
    def test_int_validation(self):
        """Ensure that invalid values cannot be assigned to int fields.
        """
        class Person(Document):
            age = IntField(min_value=0, max_value=110)
        person = Person()
        person.age = 0
        person.validate()
        person.age = 50
        person.validate()
        person.age = 110
        person.validate()
        person.age = -1
        self.assertRaises(ValidationError, person.validate)
        person.age = 120
        self.assertRaises(ValidationError, person.validate)
        person.age = 'ten'
        self.assertRaises(ValidationError, person.validate)
    def test_ne_operator(self):
        class TestDocument(Document):
            int_fld = IntField()
        TestDocument.drop_collection()
        TestDocument(int_fld=None).save()
        TestDocument(int_fld=1).save()
        self.assertEqual(1, TestDocument.objects(int_fld__ne=None).count())
        self.assertEqual(1, TestDocument.objects(int_fld__ne=1).count())
--- a/tests/fields/test_lazy_reference_field.py
+++ b/tests/fields/test_lazy_reference_field.py
@@ -1,570 +0,0 @@
 # -*- coding: utf-8 -*-
 from bson import DBRef, ObjectId
 from mongoengine import *
 from mongoengine.base import LazyReference
 from tests.utils import MongoDBTestCase
 class TestLazyReferenceField(MongoDBTestCase):
    def test_lazy_reference_config(self):
        # Make sure ReferenceField only accepts a document class or a string
        # with a document class name.
        self.assertRaises(ValidationError, LazyReferenceField, EmbeddedDocument)
    def test___repr__(self):
        class Animal(Document):
            pass
        class Ocurrence(Document):
            animal = LazyReferenceField(Animal)
        Animal.drop_collection()
        Ocurrence.drop_collection()
        animal = Animal()
        oc = Ocurrence(animal=animal)
        self.assertIn('LazyReference', repr(oc.animal))
    def test___getattr___unknown_attr_raises_attribute_error(self):
        class Animal(Document):
            pass
        class Ocurrence(Document):
            animal = LazyReferenceField(Animal)
        Animal.drop_collection()
        Ocurrence.drop_collection()
        animal = Animal().save()
        oc = Ocurrence(animal=animal)
        with self.assertRaises(AttributeError):
            oc.animal.not_exist
    def test_lazy_reference_simple(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = LazyReferenceField(Animal)
        Animal.drop_collection()
        Ocurrence.drop_collection()
        animal = Animal(name="Leopard", tag="heavy").save()
        Ocurrence(person="test", animal=animal).save()
        p = Ocurrence.objects.get()
        self.assertIsInstance(p.animal, LazyReference)
        fetched_animal = p.animal.fetch()
        self.assertEqual(fetched_animal, animal)
        # `fetch` keep cache on referenced document by default...
        animal.tag = "not so heavy"
        animal.save()
        double_fetch = p.animal.fetch()
        self.assertIs(fetched_animal, double_fetch)
        self.assertEqual(double_fetch.tag, "heavy")
        # ...unless specified otherwise
        fetch_force = p.animal.fetch(force=True)
        self.assertIsNot(fetch_force, fetched_animal)
        self.assertEqual(fetch_force.tag, "not so heavy")
    def test_lazy_reference_fetch_invalid_ref(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = LazyReferenceField(Animal)
        Animal.drop_collection()
        Ocurrence.drop_collection()
        animal = Animal(name="Leopard", tag="heavy").save()
        Ocurrence(person="test", animal=animal).save()
        animal.delete()
        p = Ocurrence.objects.get()
        self.assertIsInstance(p.animal, LazyReference)
        with self.assertRaises(DoesNotExist):
            p.animal.fetch()
    def test_lazy_reference_set(self):
        class Animal(Document):
            meta = {'allow_inheritance': True}
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = LazyReferenceField(Animal)
        Animal.drop_collection()
        Ocurrence.drop_collection()
        class SubAnimal(Animal):
            nick = StringField()
        animal = Animal(name="Leopard", tag="heavy").save()
        sub_animal = SubAnimal(nick='doggo', name='dog').save()
        for ref in (
                animal,
                animal.pk,
                DBRef(animal._get_collection_name(), animal.pk),
                LazyReference(Animal, animal.pk),
                sub_animal,
                sub_animal.pk,
                DBRef(sub_animal._get_collection_name(), sub_animal.pk),
                LazyReference(SubAnimal, sub_animal.pk),
                ):
            p = Ocurrence(person="test", animal=ref).save()
            p.reload()
            self.assertIsInstance(p.animal, LazyReference)
            p.animal.fetch()
    def test_lazy_reference_bad_set(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = LazyReferenceField(Animal)
        Animal.drop_collection()
        Ocurrence.drop_collection()
        class BadDoc(Document):
            pass
        animal = Animal(name="Leopard", tag="heavy").save()
        baddoc = BadDoc().save()
        for bad in (
                42,
                'foo',
                baddoc,
                DBRef(baddoc._get_collection_name(), animal.pk),
                LazyReference(BadDoc, animal.pk)
                ):
            with self.assertRaises(ValidationError):
                p = Ocurrence(person="test", animal=bad).save()
    def test_lazy_reference_query_conversion(self):
        """Ensure that LazyReferenceFields can be queried using objects and values
        of the type of the primary key of the referenced object.
        """
        class Member(Document):
            user_num = IntField(primary_key=True)
        class BlogPost(Document):
            title = StringField()
            author = LazyReferenceField(Member, dbref=False)
        Member.drop_collection()
        BlogPost.drop_collection()
        m1 = Member(user_num=1)
        m1.save()
        m2 = Member(user_num=2)
        m2.save()
        post1 = BlogPost(title='post 1', author=m1)
        post1.save()
        post2 = BlogPost(title='post 2', author=m2)
        post2.save()
        post = BlogPost.objects(author=m1).first()
        self.assertEqual(post.id, post1.id)
        post = BlogPost.objects(author=m2).first()
        self.assertEqual(post.id, post2.id)
        # Same thing by passing a LazyReference instance
        post = BlogPost.objects(author=LazyReference(Member, m2.pk)).first()
        self.assertEqual(post.id, post2.id)
    def test_lazy_reference_query_conversion_dbref(self):
        """Ensure that LazyReferenceFields can be queried using objects and values
        of the type of the primary key of the referenced object.
        """
        class Member(Document):
            user_num = IntField(primary_key=True)
        class BlogPost(Document):
            title = StringField()
            author = LazyReferenceField(Member, dbref=True)
        Member.drop_collection()
        BlogPost.drop_collection()
        m1 = Member(user_num=1)
        m1.save()
        m2 = Member(user_num=2)
        m2.save()
        post1 = BlogPost(title='post 1', author=m1)
        post1.save()
        post2 = BlogPost(title='post 2', author=m2)
        post2.save()
        post = BlogPost.objects(author=m1).first()
        self.assertEqual(post.id, post1.id)
        post = BlogPost.objects(author=m2).first()
        self.assertEqual(post.id, post2.id)
        # Same thing by passing a LazyReference instance
        post = BlogPost.objects(author=LazyReference(Member, m2.pk)).first()
        self.assertEqual(post.id, post2.id)
    def test_lazy_reference_passthrough(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            animal = LazyReferenceField(Animal, passthrough=False)
            animal_passthrough = LazyReferenceField(Animal, passthrough=True)
        Animal.drop_collection()
        Ocurrence.drop_collection()
        animal = Animal(name="Leopard", tag="heavy").save()
        Ocurrence(animal=animal, animal_passthrough=animal).save()
        p = Ocurrence.objects.get()
        self.assertIsInstance(p.animal, LazyReference)
        with self.assertRaises(KeyError):
            p.animal['name']
        with self.assertRaises(AttributeError):
            p.animal.name
        self.assertEqual(p.animal.pk, animal.pk)
        self.assertEqual(p.animal_passthrough.name, "Leopard")
        self.assertEqual(p.animal_passthrough['name'], "Leopard")
        # Should not be able to access referenced document's methods
        with self.assertRaises(AttributeError):
            p.animal.save
        with self.assertRaises(KeyError):
            p.animal['save']
    def test_lazy_reference_not_set(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = LazyReferenceField(Animal)
        Animal.drop_collection()
        Ocurrence.drop_collection()
        Ocurrence(person='foo').save()
        p = Ocurrence.objects.get()
        self.assertIs(p.animal, None)
    def test_lazy_reference_equality(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        Animal.drop_collection()
        animal = Animal(name="Leopard", tag="heavy").save()
        animalref = LazyReference(Animal, animal.pk)
        self.assertEqual(animal, animalref)
        self.assertEqual(animalref, animal)
        other_animalref = LazyReference(Animal, ObjectId("54495ad94c934721ede76f90"))
        self.assertNotEqual(animal, other_animalref)
        self.assertNotEqual(other_animalref, animal)
    def test_lazy_reference_embedded(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class EmbeddedOcurrence(EmbeddedDocument):
            in_list = ListField(LazyReferenceField(Animal))
            direct = LazyReferenceField(Animal)
        class Ocurrence(Document):
            in_list = ListField(LazyReferenceField(Animal))
            in_embedded = EmbeddedDocumentField(EmbeddedOcurrence)
            direct = LazyReferenceField(Animal)
        Animal.drop_collection()
        Ocurrence.drop_collection()
        animal1 = Animal('doggo').save()
        animal2 = Animal('cheeta').save()
        def check_fields_type(occ):
            self.assertIsInstance(occ.direct, LazyReference)
            for elem in occ.in_list:
                self.assertIsInstance(elem, LazyReference)
            self.assertIsInstance(occ.in_embedded.direct, LazyReference)
            for elem in occ.in_embedded.in_list:
                self.assertIsInstance(elem, LazyReference)
        occ = Ocurrence(
            in_list=[animal1, animal2],
            in_embedded={'in_list': [animal1, animal2], 'direct': animal1},
            direct=animal1
        ).save()
        check_fields_type(occ)
        occ.reload()
        check_fields_type(occ)
        occ.direct = animal1.id
        occ.in_list = [animal1.id, animal2.id]
        occ.in_embedded.direct = animal1.id
        occ.in_embedded.in_list = [animal1.id, animal2.id]
        check_fields_type(occ)
 class TestGenericLazyReferenceField(MongoDBTestCase):
    def test_generic_lazy_reference_simple(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = GenericLazyReferenceField()
        Animal.drop_collection()
        Ocurrence.drop_collection()
        animal = Animal(name="Leopard", tag="heavy").save()
        Ocurrence(person="test", animal=animal).save()
        p = Ocurrence.objects.get()
        self.assertIsInstance(p.animal, LazyReference)
        fetched_animal = p.animal.fetch()
        self.assertEqual(fetched_animal, animal)
        # `fetch` keep cache on referenced document by default...
        animal.tag = "not so heavy"
        animal.save()
        double_fetch = p.animal.fetch()
        self.assertIs(fetched_animal, double_fetch)
        self.assertEqual(double_fetch.tag, "heavy")
        # ...unless specified otherwise
        fetch_force = p.animal.fetch(force=True)
        self.assertIsNot(fetch_force, fetched_animal)
        self.assertEqual(fetch_force.tag, "not so heavy")
    def test_generic_lazy_reference_choices(self):
        class Animal(Document):
            name = StringField()
        class Vegetal(Document):
            name = StringField()
        class Mineral(Document):
            name = StringField()
        class Ocurrence(Document):
            living_thing = GenericLazyReferenceField(choices=[Animal, Vegetal])
            thing = GenericLazyReferenceField()
        Animal.drop_collection()
        Vegetal.drop_collection()
        Mineral.drop_collection()
        Ocurrence.drop_collection()
        animal = Animal(name="Leopard").save()
        vegetal = Vegetal(name="Oak").save()
        mineral = Mineral(name="Granite").save()
        occ_animal = Ocurrence(living_thing=animal, thing=animal).save()
        occ_vegetal = Ocurrence(living_thing=vegetal, thing=vegetal).save()
        with self.assertRaises(ValidationError):
            Ocurrence(living_thing=mineral).save()
        occ = Ocurrence.objects.get(living_thing=animal)
        self.assertEqual(occ, occ_animal)
        self.assertIsInstance(occ.thing, LazyReference)
        self.assertIsInstance(occ.living_thing, LazyReference)
        occ.thing = vegetal
        occ.living_thing = vegetal
        occ.save()
        occ.thing = mineral
        occ.living_thing = mineral
        with self.assertRaises(ValidationError):
            occ.save()
    def test_generic_lazy_reference_set(self):
        class Animal(Document):
            meta = {'allow_inheritance': True}
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = GenericLazyReferenceField()
        Animal.drop_collection()
        Ocurrence.drop_collection()
        class SubAnimal(Animal):
            nick = StringField()
        animal = Animal(name="Leopard", tag="heavy").save()
        sub_animal = SubAnimal(nick='doggo', name='dog').save()
        for ref in (
                animal,
                LazyReference(Animal, animal.pk),
                {'_cls': 'Animal', '_ref': DBRef(animal._get_collection_name(), animal.pk)},
                sub_animal,
                LazyReference(SubAnimal, sub_animal.pk),
                {'_cls': 'SubAnimal', '_ref': DBRef(sub_animal._get_collection_name(), sub_animal.pk)},
                ):
            p = Ocurrence(person="test", animal=ref).save()
            p.reload()
            self.assertIsInstance(p.animal, (LazyReference, Document))
            p.animal.fetch()
    def test_generic_lazy_reference_bad_set(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = GenericLazyReferenceField(choices=['Animal'])
        Animal.drop_collection()
        Ocurrence.drop_collection()
        class BadDoc(Document):
            pass
        animal = Animal(name="Leopard", tag="heavy").save()
        baddoc = BadDoc().save()
        for bad in (
                42,
                'foo',
                baddoc,
                LazyReference(BadDoc, animal.pk)
                ):
            with self.assertRaises(ValidationError):
                p = Ocurrence(person="test", animal=bad).save()
    def test_generic_lazy_reference_query_conversion(self):
        class Member(Document):
            user_num = IntField(primary_key=True)
        class BlogPost(Document):
            title = StringField()
            author = GenericLazyReferenceField()
        Member.drop_collection()
        BlogPost.drop_collection()
        m1 = Member(user_num=1)
        m1.save()
        m2 = Member(user_num=2)
        m2.save()
        post1 = BlogPost(title='post 1', author=m1)
        post1.save()
        post2 = BlogPost(title='post 2', author=m2)
        post2.save()
        post = BlogPost.objects(author=m1).first()
        self.assertEqual(post.id, post1.id)
        post = BlogPost.objects(author=m2).first()
        self.assertEqual(post.id, post2.id)
        # Same thing by passing a LazyReference instance
        post = BlogPost.objects(author=LazyReference(Member, m2.pk)).first()
        self.assertEqual(post.id, post2.id)
    def test_generic_lazy_reference_not_set(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = GenericLazyReferenceField()
        Animal.drop_collection()
        Ocurrence.drop_collection()
        Ocurrence(person='foo').save()
        p = Ocurrence.objects.get()
        self.assertIs(p.animal, None)
    def test_generic_lazy_reference_accepts_string_instead_of_class(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class Ocurrence(Document):
            person = StringField()
            animal = GenericLazyReferenceField('Animal')
        Animal.drop_collection()
        Ocurrence.drop_collection()
        animal = Animal().save()
        Ocurrence(animal=animal).save()
        p = Ocurrence.objects.get()
        self.assertEqual(p.animal, animal)
    def test_generic_lazy_reference_embedded(self):
        class Animal(Document):
            name = StringField()
            tag = StringField()
        class EmbeddedOcurrence(EmbeddedDocument):
            in_list = ListField(GenericLazyReferenceField())
            direct = GenericLazyReferenceField()
        class Ocurrence(Document):
            in_list = ListField(GenericLazyReferenceField())
            in_embedded = EmbeddedDocumentField(EmbeddedOcurrence)
            direct = GenericLazyReferenceField()
        Animal.drop_collection()
        Ocurrence.drop_collection()
        animal1 = Animal('doggo').save()
        animal2 = Animal('cheeta').save()
        def check_fields_type(occ):
            self.assertIsInstance(occ.direct, LazyReference)
            for elem in occ.in_list:
                self.assertIsInstance(elem, LazyReference)
            self.assertIsInstance(occ.in_embedded.direct, LazyReference)
            for elem in occ.in_embedded.in_list:
                self.assertIsInstance(elem, LazyReference)
        occ = Ocurrence(
            in_list=[animal1, animal2],
            in_embedded={'in_list': [animal1, animal2], 'direct': animal1},
            direct=animal1
        ).save()
        check_fields_type(occ)
        occ.reload()
        check_fields_type(occ)
        animal1_ref = {'_cls': 'Animal', '_ref': DBRef(animal1._get_collection_name(), animal1.pk)}
        animal2_ref = {'_cls': 'Animal', '_ref': DBRef(animal2._get_collection_name(), animal2.pk)}
        occ.direct = animal1_ref
        occ.in_list = [animal1_ref, animal2_ref]
        occ.in_embedded.direct = animal1_ref
        occ.in_embedded.in_list = [animal1_ref, animal2_ref]
        check_fields_type(occ)
--- a/tests/fields/test_long_field.py
+++ b/tests/fields/test_long_field.py
@@ -1,56 +0,0 @@
 # -*- coding: utf-8 -*-
 import six
 try:
    from bson.int64 import Int64
 except ImportError:
    Int64 = long
 from mongoengine import *
 from mongoengine.connection import get_db
 from tests.utils import MongoDBTestCase
 class TestLongField(MongoDBTestCase):
    def test_long_field_is_considered_as_int64(self):
        """
        Tests that long fields are stored as long in mongo, even if long
        value is small enough to be an int.
        """
        class TestLongFieldConsideredAsInt64(Document):
            some_long = LongField()
        doc = TestLongFieldConsideredAsInt64(some_long=42).save()
        db = get_db()
        self.assertIsInstance(db.test_long_field_considered_as_int64.find()[0]['some_long'], Int64)
        self.assertIsInstance(doc.some_long, six.integer_types)
    def test_long_validation(self):
        """Ensure that invalid values cannot be assigned to long fields.
        """
        class TestDocument(Document):
            value = LongField(min_value=0, max_value=110)
        doc = TestDocument()
        doc.value = 50
        doc.validate()
        doc.value = -1
        self.assertRaises(ValidationError, doc.validate)
        doc.value = 120
        self.assertRaises(ValidationError, doc.validate)
        doc.value = 'ten'
        self.assertRaises(ValidationError, doc.validate)
    def test_long_ne_operator(self):
        class TestDocument(Document):
            long_fld = LongField()
        TestDocument.drop_collection()
        TestDocument(long_fld=None).save()
        TestDocument(long_fld=1).save()
        self.assertEqual(1, TestDocument.objects(long_fld__ne=None).count())
--- a/tests/fields/test_map_field.py
+++ b/tests/fields/test_map_field.py
@@ -1,144 +0,0 @@
 # -*- coding: utf-8 -*-
 import datetime
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestMapField(MongoDBTestCase):
    def test_mapfield(self):
        """Ensure that the MapField handles the declared type."""
        class Simple(Document):
            mapping = MapField(IntField())
        Simple.drop_collection()
        e = Simple()
        e.mapping['someint'] = 1
        e.save()
        with self.assertRaises(ValidationError):
            e.mapping['somestring'] = "abc"
            e.save()
        with self.assertRaises(ValidationError):
            class NoDeclaredType(Document):
                mapping = MapField()
    def test_complex_mapfield(self):
        """Ensure that the MapField can handle complex declared types."""
        class SettingBase(EmbeddedDocument):
            meta = {"allow_inheritance": True}
        class StringSetting(SettingBase):
            value = StringField()
        class IntegerSetting(SettingBase):
            value = IntField()
        class Extensible(Document):
            mapping = MapField(EmbeddedDocumentField(SettingBase))
        Extensible.drop_collection()
        e = Extensible()
        e.mapping['somestring'] = StringSetting(value='foo')
        e.mapping['someint'] = IntegerSetting(value=42)
        e.save()
        e2 = Extensible.objects.get(id=e.id)
        self.assertIsInstance(e2.mapping['somestring'], StringSetting)
        self.assertIsInstance(e2.mapping['someint'], IntegerSetting)
        with self.assertRaises(ValidationError):
            e.mapping['someint'] = 123
            e.save()
    def test_embedded_mapfield_db_field(self):
        class Embedded(EmbeddedDocument):
            number = IntField(default=0, db_field='i')
        class Test(Document):
            my_map = MapField(field=EmbeddedDocumentField(Embedded),
                              db_field='x')
        Test.drop_collection()
        test = Test()
        test.my_map['DICTIONARY_KEY'] = Embedded(number=1)
        test.save()
        Test.objects.update_one(inc__my_map__DICTIONARY_KEY__number=1)
        test = Test.objects.get()
        self.assertEqual(test.my_map['DICTIONARY_KEY'].number, 2)
        doc = self.db.test.find_one()
        self.assertEqual(doc['x']['DICTIONARY_KEY']['i'], 2)
    def test_mapfield_numerical_index(self):
        """Ensure that MapField accept numeric strings as indexes."""
        class Embedded(EmbeddedDocument):
            name = StringField()
        class Test(Document):
            my_map = MapField(EmbeddedDocumentField(Embedded))
        Test.drop_collection()
        test = Test()
        test.my_map['1'] = Embedded(name='test')
        test.save()
        test.my_map['1'].name = 'test updated'
        test.save()
    def test_map_field_lookup(self):
        """Ensure MapField lookups succeed on Fields without a lookup
        method.
        """
        class Action(EmbeddedDocument):
            operation = StringField()
            object = StringField()
        class Log(Document):
            name = StringField()
            visited = MapField(DateTimeField())
            actions = MapField(EmbeddedDocumentField(Action))
        Log.drop_collection()
        Log(name="wilson", visited={'friends': datetime.datetime.now()},
            actions={'friends': Action(operation='drink', object='beer')}).save()
        self.assertEqual(1, Log.objects(
            visited__friends__exists=True).count())
        self.assertEqual(1, Log.objects(
            actions__friends__operation='drink',
            actions__friends__object='beer').count())
    def test_map_field_unicode(self):
        class Info(EmbeddedDocument):
            description = StringField()
            value_list = ListField(field=StringField())
        class BlogPost(Document):
            info_dict = MapField(field=EmbeddedDocumentField(Info))
        BlogPost.drop_collection()
        tree = BlogPost(info_dict={
            u"éééé": {
                'description': u"VALUE: éééé"
            }
        })
        tree.save()
        self.assertEqual(
            BlogPost.objects.get(id=tree.id).info_dict[u"éééé"].description,
            u"VALUE: éééé"
        )
--- a/tests/fields/test_reference_field.py
+++ b/tests/fields/test_reference_field.py
@@ -1,219 +0,0 @@
 # -*- coding: utf-8 -*-
 from bson import SON, DBRef
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestReferenceField(MongoDBTestCase):
    def test_reference_validation(self):
        """Ensure that invalid document objects cannot be assigned to
        reference fields.
        """
        class User(Document):
            name = StringField()
        class BlogPost(Document):
            content = StringField()
            author = ReferenceField(User)
        User.drop_collection()
        BlogPost.drop_collection()
        # Make sure ReferenceField only accepts a document class or a string
        # with a document class name.
        self.assertRaises(ValidationError, ReferenceField, EmbeddedDocument)
        user = User(name='Test User')
        # Ensure that the referenced object must have been saved
        post1 = BlogPost(content='Chips and gravy taste good.')
        post1.author = user
        self.assertRaises(ValidationError, post1.save)
        # Check that an invalid object type cannot be used
        post2 = BlogPost(content='Chips and chilli taste good.')
        post1.author = post2
        self.assertRaises(ValidationError, post1.validate)
        # Ensure ObjectID's are accepted as references
        user_object_id = user.pk
        post3 = BlogPost(content="Chips and curry sauce taste good.")
        post3.author = user_object_id
        post3.save()
        # Make sure referencing a saved document of the right type works
        user.save()
        post1.author = user
        post1.save()
        # Make sure referencing a saved document of the *wrong* type fails
        post2.save()
        post1.author = post2
        self.assertRaises(ValidationError, post1.validate)
    def test_objectid_reference_fields(self):
        """Make sure storing Object ID references works."""
        class Person(Document):
            name = StringField()
            parent = ReferenceField('self')
        Person.drop_collection()
        p1 = Person(name="John").save()
        Person(name="Ross", parent=p1.pk).save()
        p = Person.objects.get(name="Ross")
        self.assertEqual(p.parent, p1)
    def test_dbref_reference_fields(self):
        """Make sure storing references as bson.dbref.DBRef works."""
        class Person(Document):
            name = StringField()
            parent = ReferenceField('self', dbref=True)
        Person.drop_collection()
        p1 = Person(name="John").save()
        Person(name="Ross", parent=p1).save()
        self.assertEqual(
            Person._get_collection().find_one({'name': 'Ross'})['parent'],
            DBRef('person', p1.pk)
        )
        p = Person.objects.get(name="Ross")
        self.assertEqual(p.parent, p1)
    def test_dbref_to_mongo(self):
        """Make sure that calling to_mongo on a ReferenceField which
        has dbref=False, but actually actually contains a DBRef returns
        an ID of that DBRef.
        """
        class Person(Document):
            name = StringField()
            parent = ReferenceField('self', dbref=False)
        p = Person(
            name='Steve',
            parent=DBRef('person', 'abcdefghijklmnop')
        )
        self.assertEqual(p.to_mongo(), SON([
            ('name', u'Steve'),
            ('parent', 'abcdefghijklmnop')
        ]))
    def test_objectid_reference_fields(self):
        class Person(Document):
            name = StringField()
            parent = ReferenceField('self', dbref=False)
        Person.drop_collection()
        p1 = Person(name="John").save()
        Person(name="Ross", parent=p1).save()
        col = Person._get_collection()
        data = col.find_one({'name': 'Ross'})
        self.assertEqual(data['parent'], p1.pk)
        p = Person.objects.get(name="Ross")
        self.assertEqual(p.parent, p1)
    def test_undefined_reference(self):
        """Ensure that ReferenceFields may reference undefined Documents.
        """
        class Product(Document):
            name = StringField()
            company = ReferenceField('Company')
        class Company(Document):
            name = StringField()
        Product.drop_collection()
        Company.drop_collection()
        ten_gen = Company(name='10gen')
        ten_gen.save()
        mongodb = Product(name='MongoDB', company=ten_gen)
        mongodb.save()
        me = Product(name='MongoEngine')
        me.save()
        obj = Product.objects(company=ten_gen).first()
        self.assertEqual(obj, mongodb)
        self.assertEqual(obj.company, ten_gen)
        obj = Product.objects(company=None).first()
        self.assertEqual(obj, me)
        obj = Product.objects.get(company=None)
        self.assertEqual(obj, me)
    def test_reference_query_conversion(self):
        """Ensure that ReferenceFields can be queried using objects and values
        of the type of the primary key of the referenced object.
        """
        class Member(Document):
            user_num = IntField(primary_key=True)
        class BlogPost(Document):
            title = StringField()
            author = ReferenceField(Member, dbref=False)
        Member.drop_collection()
        BlogPost.drop_collection()
        m1 = Member(user_num=1)
        m1.save()
        m2 = Member(user_num=2)
        m2.save()
        post1 = BlogPost(title='post 1', author=m1)
        post1.save()
        post2 = BlogPost(title='post 2', author=m2)
        post2.save()
        post = BlogPost.objects(author=m1).first()
        self.assertEqual(post.id, post1.id)
        post = BlogPost.objects(author=m2).first()
        self.assertEqual(post.id, post2.id)
    def test_reference_query_conversion_dbref(self):
        """Ensure that ReferenceFields can be queried using objects and values
        of the type of the primary key of the referenced object.
        """
        class Member(Document):
            user_num = IntField(primary_key=True)
        class BlogPost(Document):
            title = StringField()
            author = ReferenceField(Member, dbref=True)
        Member.drop_collection()
        BlogPost.drop_collection()
        m1 = Member(user_num=1)
        m1.save()
        m2 = Member(user_num=2)
        m2.save()
        post1 = BlogPost(title='post 1', author=m1)
        post1.save()
        post2 = BlogPost(title='post 2', author=m2)
        post2.save()
        post = BlogPost.objects(author=m1).first()
        self.assertEqual(post.id, post1.id)
        post = BlogPost.objects(author=m2).first()
        self.assertEqual(post.id, post2.id)
--- a/tests/fields/test_sequence_field.py
+++ b/tests/fields/test_sequence_field.py
@@ -1,271 +0,0 @@
 # -*- coding: utf-8 -*-
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestSequenceField(MongoDBTestCase):
    def test_sequence_field(self):
        class Person(Document):
            id = SequenceField(primary_key=True)
            name = StringField()
        self.db['mongoengine.counters'].drop()
        Person.drop_collection()
        for x in range(10):
            Person(name="Person %s" % x).save()
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 10)
        ids = [i.id for i in Person.objects]
        self.assertEqual(ids, range(1, 11))
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 10)
        Person.id.set_next_value(1000)
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 1000)
    def test_sequence_field_get_next_value(self):
        class Person(Document):
            id = SequenceField(primary_key=True)
            name = StringField()
        self.db['mongoengine.counters'].drop()
        Person.drop_collection()
        for x in range(10):
            Person(name="Person %s" % x).save()
        self.assertEqual(Person.id.get_next_value(), 11)
        self.db['mongoengine.counters'].drop()
        self.assertEqual(Person.id.get_next_value(), 1)
        class Person(Document):
            id = SequenceField(primary_key=True, value_decorator=str)
            name = StringField()
        self.db['mongoengine.counters'].drop()
        Person.drop_collection()
        for x in range(10):
            Person(name="Person %s" % x).save()
        self.assertEqual(Person.id.get_next_value(), '11')
        self.db['mongoengine.counters'].drop()
        self.assertEqual(Person.id.get_next_value(), '1')
    def test_sequence_field_sequence_name(self):
        class Person(Document):
            id = SequenceField(primary_key=True, sequence_name='jelly')
            name = StringField()
        self.db['mongoengine.counters'].drop()
        Person.drop_collection()
        for x in range(10):
            Person(name="Person %s" % x).save()
        c = self.db['mongoengine.counters'].find_one({'_id': 'jelly.id'})
        self.assertEqual(c['next'], 10)
        ids = [i.id for i in Person.objects]
        self.assertEqual(ids, range(1, 11))
        c = self.db['mongoengine.counters'].find_one({'_id': 'jelly.id'})
        self.assertEqual(c['next'], 10)
        Person.id.set_next_value(1000)
        c = self.db['mongoengine.counters'].find_one({'_id': 'jelly.id'})
        self.assertEqual(c['next'], 1000)
    def test_multiple_sequence_fields(self):
        class Person(Document):
            id = SequenceField(primary_key=True)
            counter = SequenceField()
            name = StringField()
        self.db['mongoengine.counters'].drop()
        Person.drop_collection()
        for x in range(10):
            Person(name="Person %s" % x).save()
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 10)
        ids = [i.id for i in Person.objects]
        self.assertEqual(ids, range(1, 11))
        counters = [i.counter for i in Person.objects]
        self.assertEqual(counters, range(1, 11))
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 10)
        Person.id.set_next_value(1000)
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 1000)
        Person.counter.set_next_value(999)
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.counter'})
        self.assertEqual(c['next'], 999)
    def test_sequence_fields_reload(self):
        class Animal(Document):
            counter = SequenceField()
            name = StringField()
        self.db['mongoengine.counters'].drop()
        Animal.drop_collection()
        a = Animal(name="Boi").save()
        self.assertEqual(a.counter, 1)
        a.reload()
        self.assertEqual(a.counter, 1)
        a.counter = None
        self.assertEqual(a.counter, 2)
        a.save()
        self.assertEqual(a.counter, 2)
        a = Animal.objects.first()
        self.assertEqual(a.counter, 2)
        a.reload()
        self.assertEqual(a.counter, 2)
    def test_multiple_sequence_fields_on_docs(self):
        class Animal(Document):
            id = SequenceField(primary_key=True)
            name = StringField()
        class Person(Document):
            id = SequenceField(primary_key=True)
            name = StringField()
        self.db['mongoengine.counters'].drop()
        Animal.drop_collection()
        Person.drop_collection()
        for x in range(10):
            Animal(name="Animal %s" % x).save()
            Person(name="Person %s" % x).save()
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 10)
        c = self.db['mongoengine.counters'].find_one({'_id': 'animal.id'})
        self.assertEqual(c['next'], 10)
        ids = [i.id for i in Person.objects]
        self.assertEqual(ids, range(1, 11))
        id = [i.id for i in Animal.objects]
        self.assertEqual(id, range(1, 11))
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 10)
        c = self.db['mongoengine.counters'].find_one({'_id': 'animal.id'})
        self.assertEqual(c['next'], 10)
    def test_sequence_field_value_decorator(self):
        class Person(Document):
            id = SequenceField(primary_key=True, value_decorator=str)
            name = StringField()
        self.db['mongoengine.counters'].drop()
        Person.drop_collection()
        for x in range(10):
            p = Person(name="Person %s" % x)
            p.save()
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 10)
        ids = [i.id for i in Person.objects]
        self.assertEqual(ids, map(str, range(1, 11)))
        c = self.db['mongoengine.counters'].find_one({'_id': 'person.id'})
        self.assertEqual(c['next'], 10)
    def test_embedded_sequence_field(self):
        class Comment(EmbeddedDocument):
            id = SequenceField()
            content = StringField(required=True)
        class Post(Document):
            title = StringField(required=True)
            comments = ListField(EmbeddedDocumentField(Comment))
        self.db['mongoengine.counters'].drop()
        Post.drop_collection()
        Post(title="MongoEngine",
             comments=[Comment(content="NoSQL Rocks"),
                       Comment(content="MongoEngine Rocks")]).save()
        c = self.db['mongoengine.counters'].find_one({'_id': 'comment.id'})
        self.assertEqual(c['next'], 2)
        post = Post.objects.first()
        self.assertEqual(1, post.comments[0].id)
        self.assertEqual(2, post.comments[1].id)
    def test_inherited_sequencefield(self):
        class Base(Document):
            name = StringField()
            counter = SequenceField()
            meta = {'abstract': True}
        class Foo(Base):
            pass
        class Bar(Base):
            pass
        bar = Bar(name='Bar')
        bar.save()
        foo = Foo(name='Foo')
        foo.save()
        self.assertTrue('base.counter' in
                        self.db['mongoengine.counters'].find().distinct('_id'))
        self.assertFalse(('foo.counter' or 'bar.counter') in
                         self.db['mongoengine.counters'].find().distinct('_id'))
        self.assertNotEqual(foo.counter, bar.counter)
        self.assertEqual(foo._fields['counter'].owner_document, Base)
        self.assertEqual(bar._fields['counter'].owner_document, Base)
    def test_no_inherited_sequencefield(self):
        class Base(Document):
            name = StringField()
            meta = {'abstract': True}
        class Foo(Base):
            counter = SequenceField()
        class Bar(Base):
            counter = SequenceField()
        bar = Bar(name='Bar')
        bar.save()
        foo = Foo(name='Foo')
        foo.save()
        self.assertFalse('base.counter' in
                         self.db['mongoengine.counters'].find().distinct('_id'))
        self.assertTrue(('foo.counter' and 'bar.counter') in
                         self.db['mongoengine.counters'].find().distinct('_id'))
        self.assertEqual(foo.counter, bar.counter)
        self.assertEqual(foo._fields['counter'].owner_document, Foo)
        self.assertEqual(bar._fields['counter'].owner_document, Bar)
--- a/tests/fields/test_url_field.py
+++ b/tests/fields/test_url_field.py
@@ -1,59 +0,0 @@
 # -*- coding: utf-8 -*-
 from mongoengine import *
 from tests.utils import MongoDBTestCase
 class TestURLField(MongoDBTestCase):
    def test_validation(self):
        """Ensure that URLFields validate urls properly."""
        class Link(Document):
            url = URLField()
        link = Link()
        link.url = 'google'
        self.assertRaises(ValidationError, link.validate)
        link.url = 'http://www.google.com:8080'
        link.validate()
    def test_unicode_url_validation(self):
        """Ensure unicode URLs are validated properly."""
        class Link(Document):
            url = URLField()
        link = Link()
        link.url = u'http://привет.com'
        # TODO fix URL validation - this *IS* a valid URL
        # For now we just want to make sure that the error message is correct
        with self.assertRaises(ValidationError) as ctx_err:
            link.validate()
        self.assertEqual(unicode(ctx_err.exception),
                         u"ValidationError (Link:None) (Invalid URL: http://\u043f\u0440\u0438\u0432\u0435\u0442.com: ['url'])")
    def test_url_scheme_validation(self):
        """Ensure that URLFields validate urls with specific schemes properly.
        """
        class Link(Document):
            url = URLField()
        class SchemeLink(Document):
            url = URLField(schemes=['ws', 'irc'])
        link = Link()
        link.url = 'ws://google.com'
        self.assertRaises(ValidationError, link.validate)
        scheme_link = SchemeLink()
        scheme_link.url = 'ws://google.com'
        scheme_link.validate()
    def test_underscore_allowed_in_domains_names(self):
        class Link(Document):
            url = URLField()
        link = Link()
        link.url = 'https://san_leandro-ca.geebo.com'
        link.validate()
--- a/tests/fields/test_uuid_field.py
+++ b/tests/fields/test_uuid_field.py
@@ -1,65 +0,0 @@
 # -*- coding: utf-8 -*-
 import uuid
 from mongoengine import *
 from tests.utils import MongoDBTestCase, get_as_pymongo
 class Person(Document):
    api_key = UUIDField(binary=False)
 class TestUUIDField(MongoDBTestCase):
    def test_storage(self):
        uid = uuid.uuid4()
        person = Person(api_key=uid).save()
        self.assertEqual(
            get_as_pymongo(person),
            {'_id': person.id,
             'api_key': str(uid)
             }
            )
    def test_field_string(self):
        """Test UUID fields storing as String
        """
        Person.drop_collection()
        uu = uuid.uuid4()
        Person(api_key=uu).save()
        self.assertEqual(1, Person.objects(api_key=uu).count())
        self.assertEqual(uu, Person.objects.first().api_key)
        person = Person()
        valid = (uuid.uuid4(), uuid.uuid1())
        for api_key in valid:
            person.api_key = api_key
            person.validate()
        invalid = ('9d159858-549b-4975-9f98-dd2f987c113g',
                   '9d159858-549b-4975-9f98-dd2f987c113')
        for api_key in invalid:
            person.api_key = api_key
            self.assertRaises(ValidationError, person.validate)
    def test_field_binary(self):
        """Test UUID fields storing as Binary object."""
        Person.drop_collection()
        uu = uuid.uuid4()
        Person(api_key=uu).save()
        self.assertEqual(1, Person.objects(api_key=uu).count())
        self.assertEqual(uu, Person.objects.first().api_key)
        person = Person()
        valid = (uuid.uuid4(), uuid.uuid1())
        for api_key in valid:
            person.api_key = api_key
            person.validate()
        invalid = ('9d159858-549b-4975-9f98-dd2f987c113g',
                   '9d159858-549b-4975-9f98-dd2f987c113')
        for api_key in invalid:
            person.api_key = api_key
            self.assertRaises(ValidationError, person.validate)
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -48,7 +48,6 @@ class PickleSignalsTest(Document):
    def post_delete(self, sender, document, **kwargs):
        pickled = pickle.dumps(document)
 signals.post_save.connect(PickleSignalsTest.post_save, sender=PickleSignalsTest)
 signals.post_delete.connect(PickleSignalsTest.post_delete, sender=PickleSignalsTest)
--- a/Show More
+++ b/Show More
		`@@ -0,0 +1 @@`
							.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}}
`@@ -48,4 +48,4 @@ Ordering by text score`

	`::`	`::`

	`objects = News.objects.search_text('mongo').order_by('$text_score')`	`objects = News.objects.search('mongo').order_by('$text_score')`