one more test

respect db fields in multiple layers of embedded docs
2017-03-05 17:39:53 -05:00 · 2017-03-05 17:35:37 -05:00
160 changed files with 23148 additions and 30526 deletions
--- a/.github/workflows/github-actions.yml
+++ b/.github/workflows/github-actions.yml
@ -1,143 +0,0 @@
-name: MongoengineCI
-on:
-  # All PR
-  pull_request:
-  # master branch merge
-  push:
-    branches:
-      - master
-  # release tags
-  create:
-    tags:
-      - 'v[0-9]+\.[0-9]+\.[0-9]+*'
-env:
-  MONGODB_3_6: 3.6.14
-  MONGODB_4_0: 4.0.23
-  MONGODB_4_2: 4.2
-  MONGODB_4_4: 4.4
-
-  PYMONGO_3_4: 3.4
-  PYMONGO_3_6: 3.6
-  PYMONGO_3_9: 3.9
-  PYMONGO_3_11: 3.11
-
-  MAIN_PYTHON_VERSION: 3.7
-
-jobs:
-  linting:
-    # Run pre-commit (https://pre-commit.com/)
-    # which runs pre-configured linter & autoformatter
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.7
-      uses: actions/setup-python@v2
-      with:
-        python-version: 3.7
-    - run: bash .github/workflows/install_ci_python_dep.sh
-    - run: pre-commit run -a
-
-  test:
-    # Test suite run against recent python versions
-    # and against a few combination of MongoDB and pymongo
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, "3.10", pypy3]
-        MONGODB: [$MONGODB_4_0]
-        PYMONGO: [$PYMONGO_3_11]
-        include:
-          - python-version: 3.7
-            MONGODB: $MONGODB_3_6
-            PYMONGO: $PYMONGO_3_9
-          - python-version: 3.7
-            MONGODB: $MONGODB_4_2
-            PYMONGO: $PYMONGO_3_6
-          - python-version: 3.7
-            MONGODB: $MONGODB_4_4
-            PYMONGO: $PYMONGO_3_11
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: install mongo and ci dependencies
-      run: |
-        bash .github/workflows/install_mongo.sh ${{ matrix.MONGODB }}
-        bash .github/workflows/install_ci_python_dep.sh
-        bash .github/workflows/start_mongo.sh ${{ matrix.MONGODB }}
-    - name: tox dry-run (to pre-install venv)
-      run: tox -e $(echo py${{ matrix.python-version }}-mg${{ matrix.PYMONGO }} | tr -d . | sed -e 's/pypypy/pypy/') -- -a "-k=test_ci_placeholder"
-    - name: Run test suite
-      run: tox -e $(echo py${{ matrix.python-version }}-mg${{ matrix.PYMONGO }} | tr -d . | sed -e 's/pypypy/pypy/') -- -a "--cov=mongoengine"
-    - name: Send coverage to Coveralls
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        COVERALLS_SERVICE_NAME: github
-      if: ${{ matrix.python-version == env.MAIN_PYTHON_VERSION }}
-      run: coveralls
-
-  build_doc_dryrun:
-    # ensures that readthedocs can be built continuously
-    # to avoid that it breaks when new releases are being created
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
-      with:
-        python-version: 3.7
-    - name: install python dep
-      run: |
-        pip install -e .
-        pip install -r docs/requirements.txt
-    - name: build doc
-      run: |
-        cd docs
-        make html-readthedocs
-
-  build-n-publish-dummy:
-    runs-on: ubuntu-latest
-    needs: [linting, test, build_doc_dryrun]
-    if: github.event_name != 'pull_request'
-    steps:
-    - uses: actions/checkout@master
-    - name: Set up Python 3.7
-      uses: actions/setup-python@v1
-      with:
-        python-version: 3.7
-    - name: build dummy wheel for test-pypi
-      run: |
-        pip install wheel
-        python setup.py egg_info -b ".dev`date '+%Y%m%d%H%M%S'`" build sdist bdist_wheel
-#    - name: publish test-pypi
-#      # Although working and recommended, test-pypi has a limit
-#      # in the size of projects so it's better to avoid publishing
-#      # until there is a way to garbage collect these dummy releases
-#      uses: pypa/gh-action-pypi-publish@master
-#      with:
-#        password: ${{ secrets.test_pypi_token }}
-#        repository_url: https://test.pypi.org/legacy/
-
-  build-n-publish:
-    runs-on: ubuntu-latest
-    needs: [linting, test, build_doc_dryrun, build-n-publish-dummy]
-    if: github.event_name == 'create' && startsWith(github.ref, 'refs/tags/v')
-    steps:
-    - uses: actions/checkout@master
-    - name: Set up Python 3.7
-      uses: actions/setup-python@v1
-      with:
-        python-version: 3.7
-    # todo separate build from publish
-    # https://stackoverflow.com/questions/59349905/which-properties-does-github-event-in-a-github-workflow-have
-    - name: build dummy wheel for test-pypi
-      run: |
-        pip install wheel
-        python setup.py sdist bdist_wheel
-    - name: publish pypi
-      uses: pypa/gh-action-pypi-publish@master
-      with:
-        password: ${{ secrets.pypi_token }}
--- a/.github/workflows/install_ci_python_dep.sh
+++ b/.github/workflows/install_ci_python_dep.sh
@ -1,5 +0,0 @@
-#!/bin/bash
-pip install --upgrade pip
-pip install coveralls
-pip install pre-commit
-pip install tox
--- a/.github/workflows/install_mongo.sh
+++ b/.github/workflows/install_mongo.sh
@ -1,18 +0,0 @@
-#!/bin/bash
-
-MONGODB=$1
-
-# Mongo > 4.0 follows different name convention for download links
-mongo_build=mongodb-linux-x86_64-${MONGODB}
-
-if [[ "$MONGODB" == *"4.2"* ]]; then
-  mongo_build=mongodb-linux-x86_64-ubuntu1804-v${MONGODB}-latest
-elif [[ "$MONGODB" == *"4.4"* ]]; then
-  mongo_build=mongodb-linux-x86_64-ubuntu1804-v${MONGODB}-latest
-fi
-
-wget http://fastdl.mongodb.org/linux/$mongo_build.tgz
-tar xzf $mongo_build.tgz
-
-mongodb_dir=$(find ${PWD}/ -type d -name "mongodb-linux-x86_64*")
-$mongodb_dir/bin/mongod --version
--- a/.github/workflows/start_mongo.sh
+++ b/.github/workflows/start_mongo.sh
@ -1,9 +0,0 @@
-#!/bin/bash
-
-MONGODB=$1
-
-mongodb_dir=$(find ${PWD}/ -type d -name "mongodb-linux-x86_64*")
-
-mkdir $mongodb_dir/data
-$mongodb_dir/bin/mongod --dbpath $mongodb_dir/data --logpath $mongodb_dir/mongodb.log --fork
-mongo --eval 'db.version();'    # Make sure mongo is awake
--- a/.gitignore
+++ b/.gitignore
@ -1,15 +1,8 @@
+.*
 !.gitignore
 *~
 *.py[co]
 .*.sw[po]
-.cache/
-.coverage
-.coveragerc
-.env
-.idea/
-.pytest_cache/
-.tox/
-.eggs/
 *.egg
 docs/.build
 docs/_build
@ -20,6 +13,8 @@ env/
 .settings
 .project
 .pydevproject
+tests/test_bugfix.py
 htmlcov/
 venv
 venv3
+scratchpad
--- a/.install_mongodb_on_travis.sh
+++ b/.install_mongodb_on_travis.sh
@ -0,0 +1,23 @@
+#!/bin/bash
+
+sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10
+
+if [ "$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/.landscape.yml
+++ b/.landscape.yml
@ -0,0 +1,22 @@
+pylint:
+    disable:
+        # We use this a lot (e.g. via document._meta)
+        - protected-access
+
+    options:
+        additional-builtins:
+            # add xrange and long as valid built-ins. In Python 3, xrange is
+            # translated into range and long is translated into int via 2to3 (see
+            # "use_2to3" in setup.py). This should be removed when we drop Python
+            # 2 support (which probably won't happen any time soon).
+            - xrange
+            - long
+
+pyflakes:
+    disable:
+        # undefined variables are already covered by pylint (and exclude
+        # xrange & long)
+        - F821
+
+ignore-paths:
+    - benchmark.py
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@ -1,26 +0,0 @@
-fail_fast: false
-repos:
-  - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.0.1
-    hooks:
-      - id: check-merge-conflict
-      - id: debug-statements
-      - id: trailing-whitespace
-      - id: end-of-file-fixer
-  - repo: https://github.com/ambv/black
-    rev: 21.5b2
-    hooks:
-      - id: black
-  - repo: https://gitlab.com/pycqa/flake8
-    rev: 3.9.2
-    hooks:
-      - id: flake8
-  - repo: https://github.com/asottile/pyupgrade
-    rev: v2.19.1
-    hooks:
-      - id: pyupgrade
-        args: [--py36-plus]
-  - repo: https://github.com/pycqa/isort
-    rev: 5.8.0
-    hooks:
-      - id: isort
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@ -1,20 +0,0 @@
-# .readthedocs.yml
-# Read the Docs configuration file
-# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
-
-# Required
-version: 2
-
-# Build documentation in the docs/ directory with Sphinx
-sphinx:
-  configuration: docs/conf.py
-
-# Optionally set the version of Python and requirements required to build your docs
-python:
-  version: 3.7
-  install:
-    - requirements: docs/requirements.txt
-    # docs/conf.py is importing mongoengine
-    # so mongoengine needs to be installed as well
-    - method: setuptools
-      path: .
--- a/.travis.yml
+++ b/.travis.yml
@ -0,0 +1,101 @@
+# For full coverage, we'd have to test all supported Python, MongoDB, and
+# PyMongo combinations. However, that would result in an overly long build
+# with a very large number of jobs, hence we only test a subset of all the
+# combinations:
+# * MongoDB v2.4 & v3.0 are only tested against Python v2.7 & v3.5.
+# * MongoDB v2.4 is tested against PyMongo v2.7 & v3.x.
+# * MongoDB v3.0 is tested against PyMongo v3.x.
+# * MongoDB v2.6 is currently the "main" version tested against Python v2.7,
+#   v3.5, PyPy & PyPy3, and PyMongo v2.7, v2.8 & v3.x.
+#
+# Reminder: Update README.rst if you change MongoDB versions we test.
+
+language: python
+
+python:
+- 2.7
+- 3.5
+- pypy
+- pypy3
+
+env:
+- MONGODB=2.6 PYMONGO=2.7
+- MONGODB=2.6 PYMONGO=2.8
+- MONGODB=2.6 PYMONGO=3.0
+
+matrix:
+  # Finish the build as soon as one job fails
+  fast_finish: true
+
+  include:
+  - python: 2.7
+    env: MONGODB=2.4 PYMONGO=2.7
+  - python: 2.7
+    env: MONGODB=2.4 PYMONGO=3.0
+  - python: 2.7
+    env: MONGODB=3.0 PYMONGO=3.0
+  - python: 3.5
+    env: MONGODB=2.4 PYMONGO=2.7
+  - python: 3.5
+    env: MONGODB=2.4 PYMONGO=3.0
+  - python: 3.5
+    env: MONGODB=3.0 PYMONGO=3.0
+
+before_install:
+- bash .install_mongodb_on_travis.sh
+
+install:
+- sudo apt-get install python-dev python3-dev libopenjpeg-dev zlib1g-dev libjpeg-turbo8-dev
+  libtiff4-dev libjpeg8-dev libfreetype6-dev liblcms2-dev libwebp-dev tcl8.5-dev tk8.5-dev
+  python-tk
+- travis_retry pip install --upgrade pip
+- travis_retry pip install coveralls
+- travis_retry pip install flake8 flake8-import-order
+- travis_retry pip install tox>=1.9
+- travis_retry pip install "virtualenv<14.0.0"  # virtualenv>=14.0.0 has dropped Python 3.2 support (and pypy3 is based on py32)
+- travis_retry tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- -e test
+
+# Cache dependencies installed via pip
+cache: pip
+
+# Run flake8 for py27
+before_script:
+- if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then flake8 .; else echo "flake8 only runs on py27"; fi
+
+script:
+- tox -e $(echo py$TRAVIS_PYTHON_VERSION-mg$PYMONGO | tr -d . | sed -e 's/pypypy/pypy/') -- --with-coverage
+
+# For now only submit coveralls for Python v2.7. Python v3.x currently shows
+# 0% coverage. That's caused by 'use_2to3', which builds the py3-compatible
+# code in a separate dir and runs tests on that.
+after_success:
+- if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then coveralls --verbose; fi
+
+notifications:
+  irc: irc.freenode.org#mongoengine
+
+# Only run builds on the master branch and GitHub releases (tagged as vX.Y.Z)
+branches:
+  only:
+  - master
+  - /^v.*$/
+
+# Whenever a new release is created via GitHub, publish it on PyPI.
+deploy:
+  provider: pypi
+  user: the_drow
+  password:
+    secure: QMyatmWBnC6ZN3XLW2+fTBDU4LQcp1m/LjR2/0uamyeUzWKdlOoh/Wx5elOgLwt/8N9ppdPeG83ose1jOz69l5G0MUMjv8n/RIcMFSpCT59tGYqn3kh55b0cIZXFT9ar+5cxlif6a5rS72IHm5li7QQyxexJIII6Uxp0kpvUmek=
+
+  # create a source distribution and a pure python wheel for faster installs
+  distributions: "sdist bdist_wheel"
+
+  # only deploy on tagged commits (aka GitHub releases) and only for the
+  # parent repo's builds running Python 2.7 along with dev PyMongo (we run
+  # Travis against many different Python and PyMongo versions and we don't
+  # want the deploy to occur multiple times).
+  on:
+    tags: true
+    repo: MongoEngine/mongoengine
+    condition: "$PYMONGO = 3.0"
+    python: 2.7
--- a/20
+++ b/20
@ -243,23 +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)
- * Filip Kucharczyk (https://github.com/Pacu2)
- * Eric Timmons (https://github.com/daewok)
- * Matthew Simpson (https://github.com/mcsimps2)
- * Leonardo Domingues (https://github.com/leodmgs)
- * Agustin Barto (https://github.com/abarto)
- * Stankiewicz Mateusz (https://github.com/mas15)
- * Felix Schultheiß (https://github.com/felix-smashdocs)
- * Jan Stein (https://github.com/janste63)
- * Timothé Perez (https://github.com/AchilleAsh)
- * oleksandr-l5 (https://github.com/oleksandr-l5)
- * Ido Shraga (https://github.com/idoshr)
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@ -20,47 +20,20 @@ post to the `user group <http://groups.google.com/group/mongoengine-users>`
 Supported Interpreters
 ----------------------

-MongoEngine supports CPython 3.5 and newer as well as Pypy3.
-Language features not supported by all interpreters can not be used.
-
-Python3 codebase
----------------------
-
-Since 0.20, the codebase is exclusively Python 3.
-
-Earlier versions were exclusively Python2, and were relying on 2to3 to support Python3 installs.
-Travis runs the tests against the main Python 3.x versions.
-
+MongoEngine supports CPython 2.7 and newer. Language
+features not supported by all interpreters can not be used.
+Please also ensure that your code is properly converted by
+`2to3 <http://docs.python.org/library/2to3.html>`_ for Python 3 support.

 Style Guide
 -----------

-MongoEngine's codebase is auto-formatted with `black <https://github.com/python/black>`_, imports are ordered with `isort <https://pycqa.github.io/isort/>`_
-and other tools like flake8 are also used. Those tools will run as part of the CI and will fail in case the code is not formatted properly.
-
-To install all development tools, simply run the following commands:
-
-.. code-block:: console
-
-    $ python -m pip install -r requirements-dev.txt
-
-
-You can install `pre-commit <https://pre-commit.com/>`_ into your git hooks,
-to automatically check and fix any formatting issue before creating a
-git commit.
-
-To enable ``pre-commit`` simply run:
-
-.. code-block:: console
-
-    $ pre-commit install
-
-See the ``.pre-commit-config.yaml`` configuration file for more information
-on how it works.
-
-pre-commit will now run upon every commit and will reject anything that doesn't comply.
-
-You can also run all the checks with ``pre-commit run -a``, this is what is used in the CI.
+MongoEngine aims to follow `PEP8 <http://www.python.org/dev/peps/pep-0008/>`_
+including 4 space indents. When possible we try to stick to 79 character line
+limits. However, screens got bigger and an ORM has a strong focus on
+readability and if it can help, we accept 119 as maximum line length, in a
+similar way as `django does
+<https://docs.djangoproject.com/en/dev/internals/contributing/writing-code/coding-style/#python-style>`_

 Testing
 -------
@ -82,7 +55,7 @@ General Guidelines
  should adapt to the breaking change in docs/upgrade.rst.
 - Write inline documentation for new classes and methods.
 - Write tests and make sure they pass (make sure you have a mongod
-  running on the default port, then execute ``python setup.py test``
+  running on the default port, then execute ``python setup.py nosetests``
  from the cmd line to run the test suite).
 - Ensure tests pass on all supported Python, PyMongo, and MongoDB versions.
  You can test various Python and PyMongo versions locally by executing
@ -104,6 +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,
-go to the ``docs`` directory, run ``make html`` and inspect the updated docs
-by running ``open _build/html/index.html``.
+the ``sphinx`` package.
--- a/README.rst
+++ b/README.rst
@ -12,8 +12,9 @@ MongoEngine
 .. image:: https://coveralls.io/repos/github/MongoEngine/mongoengine/badge.svg?branch=master
  :target: https://coveralls.io/github/MongoEngine/mongoengine?branch=master

-.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
-  :target: https://github.com/ambv/black
+.. image:: https://landscape.io/github/MongoEngine/mongoengine/master/landscape.svg?style=flat
+  :target: https://landscape.io/github/MongoEngine/mongoengine/master
+  :alt: Code Health

 About
 =====
@ -25,30 +26,27 @@ an `API reference <https://mongoengine-odm.readthedocs.io/apireference.html>`_.

 Supported MongoDB Versions
 ==========================
-MongoEngine is currently tested against MongoDB v3.4, v3.6 and v4.0. Future versions
-should be supported as well, but aren't actively tested at the moment. Make
-sure to open an issue or submit a pull request if you experience any problems
-with MongoDB version > 4.0.
+MongoEngine is currently tested against MongoDB v2.4, v2.6, and v3.0. Future
+versions should be supported as well, but aren't actively tested at the moment.
+Make sure to open an issue or submit a pull request if you experience any
+problems with MongoDB v3.2+.

 Installation
 ============
 We recommend the use of `virtualenv <https://virtualenv.pypa.io/>`_ and of
-`pip <https://pip.pypa.io/>`_. You can then use ``python -m pip install -U mongoengine``.
+`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
-`pipenv <https://docs.pipenv.org/>`_. You can then use ``pipenv install mongoengine``
-to both create the virtual environment and install the package. Otherwise, you can
-download the source from `GitHub <http://github.com/MongoEngine/mongoengine>`_ and
-run ``python setup.py install``.
-
-The support for Python2 was dropped with MongoEngine 0.20.0
+and thus you can use ``easy_install -U mongoengine``. Otherwise, you can download the
+source from `GitHub <http://github.com/MongoEngine/mongoengine>`_ and run ``python
+setup.py install``.

 Dependencies
 ============
-All of the dependencies can easily be installed via `python -m pip <https://pip.pypa.io/>`_.
+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:

@ -58,10 +56,6 @@ If you need to use an ``ImageField`` or ``ImageGridFsProxy``:

 - Pillow>=2.0.0

-If you need to use signals:
-
- blinker>=1.3
-
 Examples
 ========
 Some simple examples of what MongoEngine code looks like:
@ -95,11 +89,12 @@ Some simple examples of what MongoEngine code looks like:

    # Iterate over all posts using the BlogPost superclass
    >>> for post in BlogPost.objects:
-    ...     print('===', post.title, '===')
+    ...     print '===', post.title, '==='
    ...     if isinstance(post, TextPost):
-    ...         print(post.content)
+    ...         print post.content
    ...     elif isinstance(post, LinkPost):
-    ...         print('Link:', post.url)
+    ...         print 'Link:', post.url
+    ...     print
    ...

    # Count all blog posts and its subtypes
@ -119,8 +114,7 @@ Some simple examples of what MongoEngine code looks like:
 Tests
 =====
 To run the test suite, ensure you are running a local instance of MongoDB on
-the standard port and have ``pytest`` installed. Then, run ``python setup.py test``
-or simply ``pytest``.
+the standard port and have ``nose`` installed. Then, run ``python setup.py nosetests``.

 To run the test suite on every supported Python and PyMongo version, you can
 use ``tox``. You'll need to make sure you have each supported Python version
@ -129,18 +123,20 @@ installed in your environment and then:
 .. code-block:: shell

    # Install tox
-    $ python -m pip install tox
+    $ pip install tox
    # Run the test suites
    $ tox

-If you wish to run a subset of tests, use the pytest convention:
+If you wish to run a subset of tests, use the nosetests convention:

 .. code-block:: shell

    # Run all the tests in a particular test file
-    $ pytest tests/fields/test_fields.py
+    $ python setup.py nosetests --tests tests/fields/fields.py
    # Run only particular test class in that file
-    $ pytest tests/fields/test_fields.py::TestField
+    $ python setup.py nosetests --tests tests/fields/fields.py:FieldTest
+    # Use the -s option if you want to print some debug statements or use pdb
+    $ python setup.py nosetests --tests tests/fields/fields.py:FieldTest -s

 Community
 =========
--- 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
@ -1,142 +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)  # noqa B010
-    )
-
-    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
@ -1,161 +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(f"{t.timeit(1)}s")
-
-    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(f"{t.timeit(1)}s")
-
-    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(f"{t.timeit(1)}s")
-
-    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(f"{t.timeit(1)}s")
-
-    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(f"{t.timeit(1)}s")
-
-    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(f"{t.timeit(1)}s")
-
-    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(f"{t.timeit(1)}s")
-
-
-if __name__ == "__main__":
-    main()
--- a/docs/Makefile
+++ b/docs/Makefile
@ -33,14 +33,8 @@ clean:
 html:
 	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html
 	@echo
-	@echo "Build finished. Check $(BUILDDIR)/html/index.html"
-
-html-readthedocs:
-	$(SPHINXBUILD) -T -E -b readthedocs $(ALLSPHINXOPTS) $(BUILDDIR)/html
-	@echo
 	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."

-
 dirhtml:
 	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
 	@echo
--- 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
+++ b/docs/_themes/sphinx_rtd_theme/static/font/fontawesome_webfont.svg
@ -0,0 +1,399 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
+<svg xmlns="http://www.w3.org/2000/svg">
+<metadata></metadata>
+<defs>
+<font id="fontawesomeregular" horiz-adv-x="1536" >
+<font-face units-per-em="1792" ascent="1536" descent="-256" />
+<missing-glyph horiz-adv-x="448" />
+<glyph unicode=" "  horiz-adv-x="448" />
+<glyph unicode="&#x09;" horiz-adv-x="448" />
+<glyph unicode="&#xa0;" horiz-adv-x="448" />
+<glyph unicode="&#xa8;" horiz-adv-x="1792" />
+<glyph unicode="&#xa9;" horiz-adv-x="1792" />
+<glyph unicode="&#xae;" horiz-adv-x="1792" />
+<glyph unicode="&#xb4;" horiz-adv-x="1792" />
+<glyph unicode="&#xc6;" horiz-adv-x="1792" />
+<glyph unicode="&#x2000;" horiz-adv-x="768" />
+<glyph unicode="&#x2001;" />
+<glyph unicode="&#x2002;" horiz-adv-x="768" />
+<glyph unicode="&#x2003;" />
+<glyph unicode="&#x2004;" horiz-adv-x="512" />
+<glyph unicode="&#x2005;" horiz-adv-x="384" />
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+<glyph unicode="&#x2009;" horiz-adv-x="307" />
+<glyph unicode="&#x200a;" horiz-adv-x="85" />
+<glyph unicode="&#x202f;" horiz-adv-x="307" />
+<glyph unicode="&#x205f;" horiz-adv-x="384" />
+<glyph unicode="&#x2122;" horiz-adv-x="1792" />
+<glyph unicode="&#x221e;" horiz-adv-x="1792" />
+<glyph unicode="&#x2260;" horiz-adv-x="1792" />
+<glyph unicode="&#xe000;" horiz-adv-x="500" d="M0 0z" />
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@ -0,0 +1,16 @@
+$( 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

@ -22,18 +21,15 @@ Documents

 .. autoclass:: mongoengine.EmbeddedDocument
   :members:
-   :inherited-members:

 .. autoclass:: mongoengine.DynamicDocument
   :members:
-   :inherited-members:

 .. autoclass:: mongoengine.DynamicEmbeddedDocument
   :members:
-   :inherited-members:

 .. autoclass:: mongoengine.document.MapReduceDocument
-   :members:
+  :members:

 .. autoclass:: mongoengine.ValidationError
  :members:
@ -75,7 +71,6 @@ Fields
 .. autoclass:: mongoengine.fields.StringField
 .. autoclass:: mongoengine.fields.URLField
 .. autoclass:: mongoengine.fields.EmailField
-.. autoclass:: mongoengine.fields.EnumField
 .. autoclass:: mongoengine.fields.IntField
 .. autoclass:: mongoengine.fields.LongField
 .. autoclass:: mongoengine.fields.FloatField
@ -92,9 +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
@ -1,5 +1,3 @@
-
-
 =========
 Changelog
 =========
@ -7,300 +5,65 @@ Changelog
 Development
 ===========
 - (Fill this out as you fix issues and develop your features).
- EnumField improvements: now `choices` limits the values of an enum to allow
- Fix deepcopy of EmbeddedDocument #2202
- Fix error when using precision=0 with DecimalField #2535
- Add support for regex and whole word text search query #2568
-
-Changes in 0.23.1
-===========
- Bug fix: ignore LazyReferenceFields when clearing _changed_fields #2484
- Improve connection doc #2481
-
-Changes in 0.23.0
-=================
- Bugfix: manually setting SequenceField in DynamicDocument doesn't increment the counter #2471
- Add MongoDB 4.2 and 4.4 to CI
- Add support for allowDiskUse on querysets #2468
-
-Changes in 0.22.1
-=================
- Declare that Py3.5 is not supported in package metadata #2449
- Moved CI from Travis to Github-Actions
-
-Changes in 0.22.0
-=================
- Fix LazyReferenceField dereferencing in embedded documents #2426
- Fix regarding the recent use of Cursor.__spec in .count() that was interfering with mongomock #2425
- Drop support for Python 3.5 by introducing f-strings in the codebase
-
-Changes in 0.21.0
-=================
- Bug fix in DynamicDocument which is not parsing known fields in constructor like Document do #2412
- When using pymongo >= 3.7, make use of Collection.count_documents instead of Collection.count
-    and Cursor.count that got deprecated in pymongo >= 3.7.
-    This should have a negative impact on performance of count see Issue #2219
- Fix a bug that made the queryset drop the read_preference after clone().
- Remove Py3.5 from CI as it reached EOL and add Python 3.9
- Fix some issues related with db_field/field conflict in constructor #2414
- BREAKING CHANGE: Fix the behavior of Doc.objects.limit(0) which should return all documents (similar to mongodb) #2311
- Bug fix in ListField when updating the first item, it was saving the whole list, instead of
-    just replacing the first item (as usually done when updating 1 item of the list) #2392
- Add EnumField: ``mongoengine.fields.EnumField``
- Refactoring - Remove useless code related to Document.__only_fields and Queryset.only_fields
- Fix query transformation regarding special operators #2365
- Bug Fix: Document.save() fails when shard_key is not _id #2154
-
-Changes in 0.20.0
-=================
- ATTENTION: Drop support for Python2
- Add Mongo 4.0 to Travis
- Fix error when setting a string as a ComplexDateTimeField #2253
- Bump development Status classifier to Production/Stable #2232
- Improve Queryset.get to avoid confusing MultipleObjectsReturned message in case multiple match are found #630
- Fixed a bug causing inaccurate query results, while combining ``__raw__`` and regular filters for the same field #2264
- Add support for the `elemMatch` projection operator in .fields() (e.g BlogPost.objects.fields(elemMatch__comments="test")) #2267
- DictField validate failed without default connection (bug introduced in 0.19.0) #2239
- Remove methods that were deprecated years ago:
-    - name parameter in Field constructor e.g `StringField(name="...")`, was replaced by db_field
-    - Queryset.slave_okay() was deprecated since pymongo3
-    - dropDups was dropped with MongoDB3
-    - ``Queryset._ensure_indexes`` and ``Queryset.ensure_indexes``, the right method to use is ``Document.ensure_indexes``
- Added pre-commit for development/CI #2212
- Renamed requirements-lint.txt to requirements-dev.txt #2212
- Support for setting ReadConcern #2255
-
-Changes in 0.19.1
-=================
- Tests require Pillow < 7.0.0 as it dropped Python2 support
- DEPRECATION: The interface of ``QuerySet.aggregate`` method was changed, it no longer takes an unpacked list of
-    pipeline steps (*pipeline) but simply takes the pipeline list just like ``pymongo.Collection.aggregate`` does. #2079
-
-Changes in 0.19.0
-=================
- BREAKING CHANGE: ``class_check`` and ``read_preference`` keyword arguments are no longer available when filtering a ``QuerySet``. #2112
-    - Instead of ``Doc.objects(foo=bar, read_preference=...)`` use ``Doc.objects(foo=bar).read_preference(...)``.
-    - Instead of ``Doc.objects(foo=bar, class_check=False)`` use ``Doc.objects(foo=bar).clear_cls_query(...)``.
-    - This change also renames the private ``QuerySet._initial_query`` attribute to ``_cls_query``.
- BREAKING CHANGE: Removed the deprecated ``format`` param from ``QuerySet.explain``. #2113
- BREAKING CHANGE: Renamed ``MongoEngineConnectionError`` to ``ConnectionFailure``. #2111
-    - If you catch/use ``MongoEngineConnectionError`` in your code, you'll have to rename it.
- BREAKING CHANGE: Positional arguments when instantiating a document are no longer supported. #2103
-    - From now on keyword arguments (e.g. ``Doc(field_name=value)``) are required.
- BREAKING CHANGE: A ``LazyReferenceField`` is now stored in the ``_data`` field of its parent as a ``DBRef``, ``Document``, or ``EmbeddedDocument`` (``ObjectId`` is no longer allowed). #2182
- DEPRECATION: ``Q.empty`` & ``QNode.empty`` are marked as deprecated and will be removed in a next version of MongoEngine. #2210
-    - Added ability to check if Q or QNode are empty by parsing them to bool.
-    - Instead of ``Q(name="John").empty`` use ``not Q(name="John")``.
- Fix updating/modifying/deleting/reloading a document that's sharded by a field with ``db_field`` specified. #2125
- Only set no_cursor_timeout when requested (fixes an incompatibility with MongoDB 4.2) #2148
- ``ListField`` now accepts an optional ``max_length`` parameter. #2110
- Improve error message related to InvalidDocumentError #2180
- Added BulkWriteError to replace NotUniqueError which was misleading in bulk write insert #2152
- Added ability to compare Q and Q operations #2204
- Added ability to use a db alias on query_counter #2194
- Added ability to specify collations for querysets with ``Doc.objects.collation`` #2024
- Fix updates of a list field by negative index #2094
- Switch from nosetest to pytest as test runner #2114
- The codebase is now formatted using ``black``. #2109
- Documentation improvements:
-    - Documented how `pymongo.monitoring` can be used to log all queries issued by MongoEngine to the driver.
-
-Changes in 0.18.2
-=================
- Replace deprecated PyMongo v2.x methods with their v3.x equivalents in the ``SequenceField``. #2097
- Various code clarity and documentation improvements.
-
-Changes in 0.18.1
-=================
- Fix a bug introduced in 0.18.0 which was causing ``Document.save`` to update all the fields instead of updating only the modified fields. This bug only occurred when using a custom PK. #2082
- Add Python 3.7 to Travis CI. #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 connection/disconnection 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`` no longer exist. #1552
-
-Changes in 0.17.0
-=================
- 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
- DEPRECATION: ``EmbeddedDocument.save`` & ``.reload`` are marked as deprecated and will be removed in a next version of MongoEngine. #1552
- Fix ``QuerySet.only`` working improperly after using ``QuerySet.count`` of the same instance of a ``QuerySet``.
- Fix ``batch_size`` that was not copied when cloning a ``QuerySet`` object. #2011
- Fix ``InvalidStringData`` error when using ``modify`` on a ``BinaryField``. #1127
- Fix test suite and CI to support MongoDB v3.4. #1445
- Fix reference fields querying the database on each access if value contains orphan DBRefs.
-
-Changes in 0.16.3
-=================
- Fix ``$push`` with the ``$position`` operator not working with lists in embedded documents. #1965
-
-Changes in 0.16.2
-=================
- Fix ``Document.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 the ``Document`` constructor (regression). #1950
- Fix a bug in the ``_delta`` method - update of a ``ListField`` depends on an unrelated dynamic field update. #1733
- Remove PyMongo's deprecated ``Collection.save`` method and use ``Collection.insert_one`` instead. #1899
-
-Changes in 0.16.0
-=================
- 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 the ``ComplexDateTime`` field is now ``None`` (and no longer the current datetime). #1368
- Fix an unhashable ``TypeError`` when referencing a ``Document`` with a compound key in an ``EmbeddedDocument``. #1685
- Fix a bug where an ``EmbeddedDocument`` with the same id as its parent would not be tracked for changes. #1768
- Fix the fact that a bulk ``QuerySet.insert`` was not setting primary keys of inserted document instances. #1919
- Fix a bug when referencing an abstract class in a ``ReferenceField``. #1920
- Allow modifications to the document made in ``pre_save_post_validation`` to be taken into account. #1202
- Replace MongoDB v2.4 tests in Travis CI with MongoDB v3.2. #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 Python 2-3 codebase compatibility. #1889
- Fix support for changing the default value of the ``ComplexDateTime`` field. #1368
- Improve error message in case an ``EmbeddedDocumentListField`` receives an ``EmbeddedDocument`` instance instead of a list. #1877
- Fix the ``inc`` and ``dec`` operators for the ``DecimalField``. #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
- Repair 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 Python 2. #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 a harmless bug related to ``GenericReferenceField`` where modifications in the generic-referenced document were tracked in the parent. #1934
- Improve validation of the ``BinaryField``. #273
- Implement lazy regex compiling in Field classes to improve ``import mongoengine`` performance. #1806
- Update ``GridFSProxy.__str__``  so that it would always print both the filename and grid_id. #710
- Add ``__repr__`` to ``Q`` and ``QCombination`` classes. #1843
- Fix bug in the ``BaseList.__iter__`` operator (was occuring when modifying a BaseList while iterating over it). #1676
- Add a ``DateField``. #513
- Various improvements to the documentation.
- Various code quality improvements.
-
-Changes in 0.15.3
-=================
- ``Queryset.update/update_one`` methods now return an ``UpdateResult`` when ``full_result=True`` is provided and no longer a dict. #1491
- Improve ``LazyReferenceField`` and ``GenericLazyReferenceField`` with nested fields. #1704
- Fix the subfield resolve error in ``generic_emdedded_document`` query. #1651 #1652
- Use each modifier only with ``$position``. #1673 #1675
- Fix validation errors in the ``GenericEmbeddedDocumentField``. #1067
- Update cached fields when a ``fields`` argument is given. #1712
- Add a ``db`` parameter to ``register_connection`` for compatibility with ``connect``.
- Use PyMongo v3.x's ``insert_one`` and ``insert_many`` in ``Document.insert``. #1491
- Use PyMongo v3.x's ``update_one`` and ``update_many`` in ``Document.update`` and ``QuerySet.update``. #1491
- Fix how ``reload(fields)`` affects changed fields. #1371
- Fix a bug where the read-only access to the database fails when trying to create indexes. #1338
-
-Changes in 0.15.0
-=================
- Add ``LazyReferenceField`` and ``GenericLazyReferenceField``. #1230
-
-Changes in 0.14.1
-=================
- Remove ``SemiStrictDict`` and start using a regular dict for ``BaseDocument._data``. #1630
- Add support for the ``$position`` param in the ``$push`` operator. #1566
- Fix ``DateTimeField`` interpreting an empty string as today. #1533
- Add a missing ``__ne__`` method to the ``GridFSProxy`` class. #1632
- Fix ``BaseQuerySet._fields_to_db_fields``. #1553
-
-Changes in 0.14.0
-=================
- BREAKING CHANGE: Remove the ``coerce_types`` param from ``QuerySet.as_pymongo``. #1549
- POTENTIAL BREAKING CHANGE: Make ``EmbeddedDocument`` not hashable by default. #1528
- Improve 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: Fix ``limit``/``skip``/``hint``/``batch_size`` chaining. #1476
- POTENTIAL BREAKING CHANGE: Change a public ``QuerySet.clone_into`` method to a private ``QuerySet._clone_into``. #1476
- Fix the way ``Document.objects.create`` works with duplicate IDs. #1485
- Fix connecting to a replica set with PyMongo 2.x. #1436
- Fix using sets in field choices. #1481
- Fix deleting items from a ``ListField``. #1318
- Fix an obscure error message when filtering by ``field__in=non_iterable``. #1237
- Fix behavior of a ``dec`` update operator. #1450
- Add a ``rename`` update operator. #1454
- Add validation for the ``db_field`` parameter. #1448
- Fix the error message displayed when querying an ``EmbeddedDocumentField`` by an invalid value. #1440
- Fix the error message displayed when validating Unicode URLs. #1486
- Raise an error when trying to save an abstract document. #1449
+- Fixed using sets in field choices #1481
+- 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 connecting to a replica set with PyMongo 2.x #1436
+- Fixed an obscure error message when filtering by `field__in=non_iterable`. #1237

 Changes in 0.11.0
 =================
- BREAKING CHANGE: Rename ``ConnectionError`` to ``MongoEngineConnectionError`` since the former is a built-in exception name in Python v3.x. #1428
- BREAKING CHANGE: Drop Python v2.6 support. #1428
- BREAKING CHANGE: ``from mongoengine.base import ErrorClass`` won't work anymore for any error from ``mongoengine.errors`` (e.g. ``ValidationError``). Use ``from mongoengine.errors import ErrorClass instead``. #1428
- BREAKING CHANGE: Accessing a broken reference will raise a ``DoesNotExist`` error. In the past it used to return ``None``. #1334
- Fix absent rounding for the ``DecimalField`` when ``force_string`` is set. #1103
+- BREAKING CHANGE: Renamed `ConnectionError` to `MongoEngineConnectionError` since the former is a built-in exception name in Python v3.x. #1428
+- BREAKING CHANGE: Dropped Python 2.6 support. #1428
+- BREAKING CHANGE: `from mongoengine.base import ErrorClass` won't work anymore for any error from `mongoengine.errors` (e.g. `ValidationError`). Use `from mongoengine.errors import ErrorClass instead`. #1428
+- BREAKING CHANGE: Accessing a broken reference will raise a `DoesNotExist` error. In the past it used to return `None`. #1334
+- Fixed absent rounding for DecimalField when `force_string` is set. #1103

 Changes in 0.10.8
 =================
- Add support for ``QuerySet.batch_size``. (#1426)
- Fix a query set iteration within an iteration. #1427
- Fix an issue where specifying a MongoDB URI host would override more information than it should. #1421
- Add an ability to filter the ``GenericReferenceField`` by an ``ObjectId`` and a ``DBRef``. #1425
- Fix cascading deletes for models with a custom primary key field. #1247
- Add ability to specify an authentication mechanism (e.g. X.509). #1333
- Add support for falsy primary keys (e.g. ``doc.pk = 0``). #1354
- Fix ``QuerySet.sum/average`` for fields w/ an explicit ``db_field``. #1417
- Fix filtering by ``embedded_doc=None``. #1422
- Add support for ``Cursor.comment``. #1420
- Fix ``doc.get_<field>_display`` methods. #1419
- Fix the ``__repr__`` method of the ``StrictDict`` #1424
- Add a deprecation warning for Python v2.6.
+- Added support for QuerySet.batch_size (#1426)
+- Fixed query set iteration within iteration #1427
+- Fixed an issue where specifying a MongoDB URI host would override more information than it should #1421
+- Added ability to filter the generic reference field by ObjectId and DBRef #1425
+- Fixed delete cascade for models with a custom primary key field #1247
+- Added ability to specify an authentication mechanism (e.g. X.509) #1333
+- Added support for falsey primary keys (e.g. doc.pk = 0) #1354
+- Fixed QuerySet#sum/average for fields w/ explicit db_field #1417
+- Fixed filtering by embedded_doc=None #1422
+- Added support for cursor.comment #1420
+- Fixed doc.get_<field>_display #1419
+- Fixed __repr__ method of the StrictDict #1424
+- Added a deprecation warning for Python 2.6

 Changes in 0.10.7
 =================
- Drop Python 3.2 support #1390
- Fix a bug where a dynamic doc has an index inside a dict field. #1278
- Fix: ``ListField`` minus index assignment does not work. #1128
- Fix cascade delete mixing among collections. #1224
- Add ``signal_kwargs`` argument to ``Document.save``, ``Document.delete`` and ``BaseQuerySet.insert`` to be passed to signals calls. #1206
- Raise ``OperationError`` when trying to do a ``drop_collection`` on document with no collection set.
- Fix a bug where a count on ``ListField`` of ``EmbeddedDocumentField`` fails. #1187
- Fix ``LongField`` values stored as int32 in Python 3. #1253
- ``MapField`` now handles unicode keys correctly. #1267
- ``ListField`` now handles negative indicies correctly. #1270
- Fix an ``AttributeError`` when initializing an ``EmbeddedDocument`` with positional args. #681
- Fix a ``no_cursor_timeout`` error with PyMongo v3.x. #1304
- Replace map-reduce based ``QuerySet.sum/average`` with aggregation-based implementations. #1336
- Fix support for ``__`` to escape field names that match operators' names in ``update``. #1351
- Fix ``BaseDocument._mark_as_changed``. #1369
- Add support for pickling ``QuerySet`` instances. #1397
- Fix connecting to a list of hosts. #1389
- Fix a bug where accessing broken references wouldn't raise a ``DoesNotExist`` error. #1334
- Fix not being able to specify ``use_db_field=False`` on ``ListField(EmbeddedDocumentField)`` instances. #1218
- Improvements to the dictionary field's docs. #1383
+- Dropped Python 3.2 support #1390
+- Fixed the bug where dynamic doc has index inside a dict field #1278
+- Fixed: ListField minus index assignment does not work #1128
+- Fixed cascade delete mixing among collections #1224
+- Add `signal_kwargs` argument to `Document.save`, `Document.delete` and `BaseQuerySet.insert` to be passed to signals calls #1206
+- Raise `OperationError` when trying to do a `drop_collection` on document with no collection set.
+- count on ListField of EmbeddedDocumentField fails. #1187
+- Fixed long fields stored as int32 in Python 3. #1253
+- MapField now handles unicodes keys correctly. #1267
+- ListField now handles negative indicies correctly. #1270
+- Fixed AttributeError when initializing EmbeddedDocument with positional args. #681
+- Fixed no_cursor_timeout error with pymongo 3.0+ #1304
+- Replaced map-reduce based QuerySet.sum/average with aggregation-based implementations #1336
+- Fixed support for `__` to escape field names that match operators names in `update` #1351
+- Fixed BaseDocument#_mark_as_changed #1369
+- Added support for pickling QuerySet instances. #1397
+- Fixed connecting to a list of hosts #1389
+- Fixed a bug where accessing broken references wouldn't raise a DoesNotExist error #1334
+- Fixed not being able to specify use_db_field=False on ListField(EmbeddedDocumentField) instances #1218
+- Improvements to the dictionary fields docs #1383

 Changes in 0.10.6
 =================
 - Add support for mocking MongoEngine based on mongomock. #1151
- Fix not being able to run tests on Windows. #1153
+- Fixed not being able to run tests on Windows. #1153
 - Allow creation of sparse compound indexes. #1114
+- count on ListField of EmbeddedDocumentField fails. #1187

 Changes in 0.10.5
 =================
@ -308,12 +71,12 @@ Changes in 0.10.5

 Changes in 0.10.4
 =================
- ``SaveConditionError`` is now importable from the top level package. #1165
- Add a ``QuerySet.upsert_one`` method. #1157
+- SaveConditionError is now importable from the top level package. #1165
+- upsert_one method added. #1157

 Changes in 0.10.3
 =================
- Fix ``read_preference`` (it had chaining issues with PyMongo v2.x and it didn't work at all with PyMongo v3.x). #1042
+- Fix `read_preference` (it had chaining issues with PyMongo 2.x and it didn't work at all with PyMongo 3.x) #1042

 Changes in 0.10.2
 =================
@ -323,16 +86,16 @@ Changes in 0.10.2

 Changes in 0.10.1
 =================
- Fix infinite recursion with cascade delete rules under specific conditions. #1046
- Fix ``CachedReferenceField`` bug when loading cached docs as ``DBRef`` but failing to save them. #1047
- Fix ignored chained options. #842
- ``Document.save``'s ``save_condition`` error raises a ``SaveConditionError`` exception. #1070
- Fix ``Document.reload`` for the ``DynamicDocument``. #1050
- ``StrictDict`` & ``SemiStrictDict`` are shadowed at init time. #1105
- Fix ``ListField`` negative index assignment not working. #1119
- Remove code that marks a field as changed when the field has a default value but does not exist in the database. #1126
- Remove test dependencies (nose and rednose) from install dependencies. #1079
- Recursively build a query when using the ``elemMatch`` operator. #1130
+- Fix infinite recursion with CASCADE delete rules under specific conditions. #1046
+- Fix CachedReferenceField bug when loading cached docs as DBRef but failing to save them. #1047
+- Fix ignored chained options #842
+- Document save's save_condition error raises `SaveConditionError` exception #1070
+- Fix Document.reload for DynamicDocument. #1050
+- StrictDict & SemiStrictDict are shadowed at init time. #1105
+- Fix ListField minus index assignment does not work. #1119
+- Remove code that marks field as changed when the field has default but not existed in database #1126
+- Remove test dependencies (nose and rednose) from install dependencies list. #1079
+- Recursively build query when using elemMatch operator. #1130
 - Fix instance back references for lists of embedded documents. #1131

 Changes in 0.10.0
@ -343,7 +106,7 @@ Changes in 0.10.0
 - Removed get_or_create() deprecated since 0.8.0. #300
 - Improve Document._created status when switch collection and db #1020
 - Queryset update doesn't go through field validation #453
- Added support for specifying authentication source as option ``authSource`` in URI. #967
+- Added support for specifying authentication source as option `authSource` in URI. #967
 - Fixed mark_as_changed to handle higher/lower level fields changed. #927
 - ListField of embedded docs doesn't set the _instance attribute when iterating over it #914
 - Support += and *= for ListField #595
@ -359,7 +122,7 @@ Changes in 0.10.0
 - Fixes some internal _id handling issue. #961
 - Updated URL and Email Field regex validators, added schemes argument to URLField validation. #652
 - Capped collection multiple of 256. #1011
- Added ``BaseQuerySet.aggregate_sum`` and ``BaseQuerySet.aggregate_average`` methods.
+- Added `BaseQuerySet.aggregate_sum` and `BaseQuerySet.aggregate_average` methods.
 - Fix for delete with write_concern {'w': 0}. #1008
 - Allow dynamic lookup for more than two parts. #882
 - Added support for min_distance on geo queries. #831
@ -368,10 +131,10 @@ Changes in 0.10.0
 Changes in 0.9.0
 ================
 - Update FileField when creating a new file #714
- Added ``EmbeddedDocumentListField`` for Lists of Embedded Documents. #826
+- Added `EmbeddedDocumentListField` for Lists of Embedded Documents. #826
 - ComplexDateTimeField should fall back to None when null=True #864
 - Request Support for $min, $max Field update operators #863
- ``BaseDict`` does not follow ``setdefault`` #866
+- `BaseDict` does not follow `setdefault` #866
 - Add support for $type operator # 766
 - Fix tests for pymongo 2.8+ #877
 - No module named 'django.utils.importlib' (Django dev) #872
@ -392,13 +155,13 @@ Changes in 0.9.0
 - Stop ensure_indexes running on a secondaries unless connection is through mongos #746
 - Not overriding default values when loading a subset of fields #399
 - Saving document doesn't create new fields in existing collection #620
- Added ``Queryset.aggregate`` wrapper to aggregation framework #703
+- Added `Queryset.aggregate` wrapper to aggregation framework #703
 - Added support to show original model fields on to_json calls instead of db_field #697
 - Added Queryset.search_text to Text indexes searchs #700
 - Fixed tests for Django 1.7 #696
 - Follow ReferenceFields in EmbeddedDocuments with select_related #690
 - Added preliminary support for text indexes #680
- Added ``elemMatch`` operator as well - ``match`` is too obscure #653
+- Added `elemMatch` operator as well - `match` is too obscure #653
 - Added support for progressive JPEG #486 #548
 - Allow strings to be used in index creation #675
 - Fixed EmbeddedDoc weakref proxy issue #592
@ -434,11 +197,11 @@ Changes in 0.9.0
 - Increase email field length to accommodate new TLDs #726
 - index_cls is ignored when deciding to set _cls as index prefix #733
 - Make 'db' argument to connection optional #737
- Allow atomic update for the entire ``DictField`` #742
+- Allow atomic update for the entire `DictField` #742
 - Added MultiPointField, MultiLineField, MultiPolygonField
 - Fix multiple connections aliases being rewritten #748
 - Fixed a few instances where reverse_delete_rule was written as reverse_delete_rules. #791
- Make ``in_bulk()`` respect ``no_dereference()`` #775
+- Make `in_bulk()` respect `no_dereference()` #775
 - Handle None from model __str__; Fixes #753 #754
 - _get_changed_fields fix for embedded documents with id field. #925

@ -492,15 +255,18 @@ Changes in 0.8.4

 Changes in 0.8.3
 ================
- Fixed EmbeddedDocuments with ``id`` also storing ``_id`` (#402)
+- Fixed EmbeddedDocuments with `id` also storing `_id` (#402)
 - Added get_proxy_object helper to filefields (#391)
 - Added QuerySetNoCache and QuerySet.no_cache() for lower memory consumption (#365)
 - Fixed sum and average mapreduce dot notation support (#375, #376, #393)
 - Fixed as_pymongo to return the id (#386)
- Document.select_related() now respects ``db_alias`` (#377)
+- Document.select_related() now respects `db_alias` (#377)
 - Reload uses shard_key if applicable (#384)
 - Dynamic fields are ordered based on creation and stored in _fields_ordered (#396)
- Fixed pickling dynamic documents ``_dynamic_fields`` (#387)
+
+  **Potential breaking change:** http://docs.mongoengine.org/en/latest/upgrade.html#to-0-8-3
+
+- Fixed pickling dynamic documents `_dynamic_fields` (#387)
 - Fixed ListField setslice and delslice dirty tracking (#390)
 - Added Django 1.5 PY3 support (#392)
 - Added match ($elemMatch) support for EmbeddedDocuments (#379)
@ -541,7 +307,7 @@ Changes in 0.8.0
 ================
 - Fixed querying ReferenceField custom_id (#317)
 - Fixed pickle issues with collections (#316)
- Added ``get_next_value`` preview for SequenceFields (#319)
+- Added `get_next_value` preview for SequenceFields (#319)
 - Added no_sub_classes context manager and queryset helper (#312)
 - Querysets now utilises a local cache
 - Changed __len__ behaviour in the queryset (#247, #311)
@ -570,7 +336,7 @@ Changes in 0.8.0
 - Updated connection to use MongoClient (#262, #274)
 - Fixed db_alias and inherited Documents (#143)
 - Documentation update for document errors (#124)
- Deprecated ``get_or_create`` (#35)
+- Deprecated `get_or_create` (#35)
 - Updated inheritable objects created by upsert now contain _cls (#118)
 - Added support for creating documents with embedded documents in a single operation (#6)
 - Added to_json and from_json to Document (#1)
@ -691,7 +457,7 @@ Changes in 0.7.0
 - Fixed UnboundLocalError in composite index with pk field (#88)
 - Updated ReferenceField's to optionally store ObjectId strings
  this will become the default in 0.8 (#89)
- Added FutureWarning - save will default to ``cascade=False`` in 0.8
+- Added FutureWarning - save will default to `cascade=False` in 0.8
 - Added example of indexing embedded document fields (#75)
 - Fixed ImageField resizing when forcing size (#80)
 - Add flexibility for fields handling bad data (#78)
@ -787,7 +553,7 @@ Changes in 0.6.8
 ================
 - Fixed FileField losing reference when no default set
 - Removed possible race condition from FileField (grid_file)
- Added assignment to save, can now do: ``b = MyDoc(**kwargs).save()``
+- Added assignment to save, can now do: `b = MyDoc(**kwargs).save()`
 - Added support for pull operations on nested EmbeddedDocuments
 - Added support for choices with GenericReferenceFields
 - Added support for choices with GenericEmbeddedDocumentFields
@ -802,7 +568,7 @@ Changes in 0.6.7
 - Fixed indexing on '_id' or 'pk' or 'id'
 - Invalid data from the DB now raises a InvalidDocumentError
 - Cleaned up the Validation Error - docs and code
- Added meta ``auto_create_index`` so you can disable index creation
+- Added meta `auto_create_index` so you can disable index creation
 - Added write concern options to inserts
 - Fixed typo in meta for index options
 - Bug fix Read preference now passed correctly
@ -843,6 +609,7 @@ Changes in 0.6.1

 Changes in 0.6
 ==============
+
 - Added FutureWarning to inherited classes not declaring 'allow_inheritance' as the default will change in 0.7
 - Added support for covered indexes when inheritance is off
 - No longer always upsert on save for items with a '_id'
@ -1067,6 +834,7 @@ Changes in v0.1.3
  querying takes place
 - A few minor bugfixes

+
 Changes in v0.1.2
 =================
 - Query values may be processed before before being used in queries
@ -1075,6 +843,7 @@ Changes in v0.1.2
 - Added ``BooleanField``
 - Added ``Document.reload()`` method

+
 Changes in v0.1.1
 =================
 - Documents may now use capped collections
--- a/docs/code/tumblelog.py
+++ b/docs/code/tumblelog.py
@ -1,19 +1,16 @@
 from mongoengine import *

-connect("tumblelog")
-
+connect('tumblelog')

 class Comment(EmbeddedDocument):
    content = StringField()
    name = StringField(max_length=120)

-
 class User(Document):
    email = StringField(required=True)
    first_name = StringField(max_length=50)
    last_name = StringField(max_length=50)

-
 class Post(Document):
    title = StringField(max_length=120, required=True)
    author = ReferenceField(User)
@ -21,57 +18,54 @@ class Post(Document):
    comments = ListField(EmbeddedDocumentField(Comment))

    # bugfix
-    meta = {"allow_inheritance": True}
+    meta = {'allow_inheritance': True}


 class TextPost(Post):
    content = StringField()

-
 class ImagePost(Post):
    image_path = StringField()

-
 class LinkPost(Post):
    link_url = StringField()

-
 Post.drop_collection()

-john = User(email="jdoe@example.com", first_name="John", last_name="Doe")
+john = User(email='jdoe@example.com', first_name='John', last_name='Doe')
 john.save()

-post1 = TextPost(title="Fun with MongoEngine", author=john)
-post1.content = "Took a look at MongoEngine today, looks pretty cool."
-post1.tags = ["mongodb", "mongoengine"]
+post1 = TextPost(title='Fun with MongoEngine', author=john)
+post1.content = 'Took a look at MongoEngine today, looks pretty cool.'
+post1.tags = ['mongodb', 'mongoengine']
 post1.save()

-post2 = LinkPost(title="MongoEngine Documentation", author=john)
-post2.link_url = "http://tractiondigital.com/labs/mongoengine/docs"
-post2.tags = ["mongoengine"]
+post2 = LinkPost(title='MongoEngine Documentation', author=john)
+post2.link_url = 'http://tractiondigital.com/labs/mongoengine/docs'
+post2.tags = ['mongoengine']
 post2.save()

-print("ALL POSTS")
-print()
+print 'ALL POSTS'
+print
 for post in Post.objects:
-    print(post.title)
-    # print '=' * post.title.count()
-    print("=" * 20)
+    print post.title
+    #print '=' * post.title.count()
+    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()
-for post in Post.objects(tags="mongodb"):
-    print(post.title)
-print()
+print 'POSTS TAGGED \'MONGODB\''
+print
+for post in Post.objects(tags='mongodb'):
+    print post.title
+print

-num_posts = Post.objects(tags="mongodb").count()
-print('Found %d posts with tag "mongodb"' % num_posts)
+num_posts = Post.objects(tags='mongodb').count()
+print 'Found %d posts with tag "mongodb"' % num_posts
--- a/docs/conf.py
+++ b/docs/conf.py
@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 #
 # MongoEngine documentation build configuration file, created by
 # sphinx-quickstart on Sun Nov 22 18:14:13 2009.
@ -10,44 +11,40 @@
 # All configuration values have a default; values that are commented out
 # serve to show the default.

-import os
-import sys
-
-import sphinx_rtd_theme
-
-import mongoengine
+import sys, os

 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-sys.path.insert(0, os.path.abspath(".."))
+sys.path.insert(0, os.path.abspath('..'))

 # -- General configuration -----------------------------------------------------

 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ["sphinx.ext.autodoc", "sphinx.ext.todo", "readthedocs_ext.readthedocs"]
+extensions = ['sphinx.ext.autodoc', 'sphinx.ext.todo']

 # Add any paths that contain templates here, relative to this directory.
-templates_path = ["_templates"]
+templates_path = ['_templates']

 # The suffix of source filenames.
-source_suffix = ".rst"
+source_suffix = '.rst'

 # The encoding of source files.
-# source_encoding = 'utf-8'
+#source_encoding = 'utf-8'

 # The master toctree document.
-master_doc = "index"
+master_doc = 'index'

 # General information about the project.
-project = "MongoEngine"
-copyright = "2009, MongoEngine Authors"  # noqa: A001
+project = u'MongoEngine'
+copyright = u'2009, MongoEngine Authors'

 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 #
+import mongoengine
 # The short X.Y version.
 version = mongoengine.get_version()
 # The full version, including alpha/beta/rc tags.
@ -55,66 +52,66 @@ release = mongoengine.get_version()

 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
-# language = None
+#language = None

 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:
-# today = ''
+#today = ''
 # Else, today_fmt is used as the format for a strftime call.
-# today_fmt = '%B %d, %Y'
+#today_fmt = '%B %d, %Y'

 # List of documents that shouldn't be included in the build.
-# unused_docs = []
+#unused_docs = []

 # List of directories, relative to source directory, that shouldn't be searched
 # for source files.
-exclude_trees = ["_build"]
+exclude_trees = ['_build']

 # The reST default role (used for this markup: `text`) to use for all documents.
-# default_role = None
+#default_role = None

 # If true, '()' will be appended to :func: etc. cross-reference text.
-# add_function_parentheses = True
+#add_function_parentheses = True

 # If true, the current module name will be prepended to all description
 # unit titles (such as .. function::).
-# add_module_names = True
+#add_module_names = True

 # If true, sectionauthor and moduleauthor directives will be shown in the
 # output. They are ignored by default.
-# show_authors = False
+#show_authors = False

 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = "sphinx"
+pygments_style = 'sphinx'

 # A list of ignored prefixes for module index sorting.
-# modindex_common_prefix = []
+#modindex_common_prefix = []


 # -- Options for HTML output ---------------------------------------------------

 # The theme to use for HTML and HTML Help pages.  Major themes that come with
 # Sphinx are currently 'default' and 'sphinxdoc'.
-html_theme = "sphinx_rtd_theme"
+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 = {"canonical_url": "http://docs.mongoengine.org/en/latest/"}
+#html_theme_options = {}

 # 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".
-# html_title = None
+#html_title = None

 # A shorter title for the navigation bar.  Default is the same as html_title.
-# html_short_title = None
+#html_short_title = None

 # The name of an image file (relative to this directory) to place at the top
 # of the sidebar.
-# html_logo = None
+#html_logo = None

 # The name of an image file (within the static path) to use as favicon of the
 # docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
@ -124,11 +121,11 @@ html_favicon = "favicon.ico"
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
 # so a file named "default.css" will overwrite the builtin "default.css".
-# html_static_path = ['_static']
+#html_static_path = ['_static']

 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.
-# html_last_updated_fmt = '%b %d, %Y'
+#html_last_updated_fmt = '%b %d, %Y'

 # If true, SmartyPants will be used to convert quotes and dashes to
 # typographically correct entities.
@ -136,68 +133,73 @@ html_use_smartypants = True

 # Custom sidebar templates, maps document names to template names.
 html_sidebars = {
-    "index": ["globaltoc.html", "searchbox.html"],
-    "**": ["localtoc.html", "relations.html", "searchbox.html"],
+    'index': ['globaltoc.html', 'searchbox.html'],
+    '**': ['localtoc.html', 'relations.html', 'searchbox.html']
 }


 # Additional templates that should be rendered to pages, maps page names to
 # template names.
-# html_additional_pages = {}
+#html_additional_pages = {}

 # If false, no module index is generated.
-# html_use_modindex = True
+#html_use_modindex = True

 # If false, no index is generated.
-# html_use_index = True
+#html_use_index = True

 # If true, the index is split into individual pages for each letter.
-# html_split_index = False
+#html_split_index = False

 # If true, links to the reST sources are added to the pages.
-# html_show_sourcelink = True
+#html_show_sourcelink = True

 # If true, an OpenSearch description file will be output, and all pages will
 # contain a <link> tag referring to it.  The value of this option must be the
 # base URL from which the finished HTML is served.
-# html_use_opensearch = ''
+#html_use_opensearch = ''

 # If nonempty, this is the file name suffix for HTML files (e.g. ".xhtml").
-# html_file_suffix = ''
+#html_file_suffix = ''

 # Output file base name for HTML help builder.
-htmlhelp_basename = "MongoEnginedoc"
+htmlhelp_basename = 'MongoEnginedoc'


 # -- Options for LaTeX output --------------------------------------------------

 # The paper size ('letter' or 'a4').
-latex_paper_size = "a4"
+latex_paper_size = 'a4'

 # The font size ('10pt', '11pt' or '12pt').
-# latex_font_size = '10pt'
+#latex_font_size = '10pt'

 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass [howto/manual]).
 latex_documents = [
-    ("index", "MongoEngine.tex", "MongoEngine Documentation", "Ross Lawley", "manual")
+  ('index', 'MongoEngine.tex', 'MongoEngine Documentation',
+   'Ross Lawley', 'manual'),
 ]

 # The name of an image file (relative to this directory) to place at the top of
 # the title page.
-# latex_logo = None
+#latex_logo = None

 # For "manual" documents, if this is true, then toplevel headings are parts,
 # not chapters.
-# latex_use_parts = False
+#latex_use_parts = False

 # Additional stuff for the LaTeX preamble.
-# latex_preamble = ''
+#latex_preamble = ''

 # Documents to append as an appendix to all manuals.
-# latex_appendices = []
+#latex_appendices = []

 # If false, no module index is generated.
-# latex_use_modindex = True
+#latex_use_modindex = True

-autoclass_content = "both"
+autoclass_content = 'both'
+
+html_theme_options = dict(
+    canonical_url='http://docs.mongoengine.org/en/latest/'
+)
--- a/docs/django.rst
+++ b/docs/django.rst
@ -13,7 +13,7 @@ Help Wanted!

 The MongoEngine team is looking for help contributing and maintaining a new
 Django extension for MongoEngine! If you have Django experience and would like
-to help contribute to the project, please get in touch on the
-`mailing list <http://groups.google.com/group/mongoengine-users>`_ or by
+to help contribute to the project, please get in touch on the 
+`mailing list <http://groups.google.com/group/mongoengine-users>`_ or by 
 simply contributing on
 `GitHub <https://github.com/MongoEngine/django-mongoengine>`_.
--- a/docs/faq.rst
+++ b/docs/faq.rst
@ -1,12 +0,0 @@
-==========================
-Frequently Asked Questions
-==========================
-
-Does MongoEngine support asynchronous drivers (Motor, TxMongo)?
---------------------------------------------------------------
-
-No, MongoEngine is exclusively based on PyMongo and isn't designed to support other driver.
-If this is a requirement for your project, check the alternative:  `uMongo`_ and `MotorEngine`_.
-
-.. _uMongo: https://umongo.readthedocs.io/
-.. _MotorEngine: https://motorengine.readthedocs.io/
--- a/docs/guide/connecting.rst
+++ b/docs/guide/connecting.rst
@ -4,76 +4,33 @@
 Connecting to MongoDB
 =====================

-Connections in MongoEngine are registered globally and are identified with aliases.
-If no ``alias`` is provided during the connection, it will use "default" as alias.
-
-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::
+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')

 By default, MongoEngine assumes that the :program:`mongod` instance is running
-on **localhost** on port **27017**.
+on **localhost** on port **27017**. If MongoDB is running elsewhere, you should
+provide the :attr:`host` and :attr:`port` arguments to
+:func:`~mongoengine.connect`::

-If MongoDB is running elsewhere, you need to provide details on how to connect. There are two ways of
-doing this. Using a connection string in URI format (**this is the preferred method**) or individual attributes
-provided as keyword arguments.
+    connect('project1', host='192.168.1.35', port=12345)

-Connect with URI string
-=======================
+If the database requires authentication, :attr:`username` and :attr:`password`
+arguments should be provided::

-When using a connection string in URI format you should specify the connection details
-as the :attr:`host` to :func:`~mongoengine.connect`. In a web application context for instance, the URI
-is typically read from the config file::
+    connect('project1', username='webapp', password='pwd123')

-        connect(host="mongodb://127.0.0.1:27017/my_db")
+URI style connections are also supported -- just supply the URI as
+the :attr:`host` to
+:func:`~mongoengine.connect`::

-If the database requires authentication, you can specify it in the
-URI. As each database can have its own users configured, you need to tell MongoDB
-where to look for the user you are working with, that's what the ``?authSource=admin`` bit
-of the MongoDB connection string is for::
-
-    # Connects to 'my_db' database by authenticating
-    # with given credentials against the 'admin' database (by default as authSource isn't provided)
-    connect(host="mongodb://my_user:my_password@127.0.0.1:27017/my_db")
-
-    # Equivalent to previous connection but explicitly states that
-    # it should use admin as the authentication source database
-    connect(host="mongodb://my_user:my_password@hostname:port/my_db?authSource=admin")
-
-    # Connects to 'my_db' database by authenticating
-    # with given credentials against that same database
-    connect(host="mongodb://my_user:my_password@127.0.0.1:27017/my_db?authSource=my_db")
-
-The URI string can also be used to configure advanced parameters like ssl, replicaSet, etc. For more
-information or example about URI string, you can refer to the `official doc <https://docs.mongodb.com/manual/reference/connection-string/>`_::
-
-    connect(host="mongodb://my_user:my_password@127.0.0.1:27017/my_db?authSource=admin&ssl=true&replicaSet=globaldb")
-
-.. note:: URI containing SRV records (e.g "mongodb+srv://server.example.com/") can be used as well
-
-Connect with keyword attributes
-===============================
-
-The second option for specifying the connection details is to provide the information as keyword
-attributes to :func:`~mongoengine.connect`::
-
-    connect('my_db', host='127.0.0.1', port=27017)
-
-If the database requires authentication, :attr:`username`, :attr:`password`
-and :attr:`authentication_source` arguments should be provided::
-
-    connect('my_db', username='my_user', password='my_password', authentication_source='admin')
-
-The set of attributes that :func:`~mongoengine.connect` recognizes includes but is not limited to:
-:attr:`host`, :attr:`port`, :attr:`read_preference`, :attr:`username`, :attr:`password`, :attr:`authentication_source`, :attr:`authentication_mechanism`,
-:attr:`replicaset`, :attr:`tls`, etc. Most of the parameters accepted by `pymongo.MongoClient <https://pymongo.readthedocs.io/en/stable/api/pymongo/mongo_client.html#pymongo.mongo_client.MongoClient>`_
-can be used with :func:`~mongoengine.connect` and will simply be forwarded when instantiating the `pymongo.MongoClient`.
+    connect('project1', host='mongodb://localhost/database_name')

 .. note:: Database, username and password from URI string overrides
-    corresponding parameters in :func:`~mongoengine.connect`, this should
-    obviously be avoided: ::
+    corresponding parameters in :func:`~mongoengine.connect`: ::

        connect(
            db='test',
@ -82,19 +39,25 @@ can be used with :func:`~mongoengine.connect` and will simply be forwarded when
            host='mongodb://admin:qwerty@localhost/production'
        )

-    will establish connection to ``production`` database using ``admin`` username and ``qwerty`` password.
+    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
+============

-Read Preferences
-================
+MongoEngine supports connecting to replica sets::

-As stated above, Read preferences are supported through the connection but also via individual
+    from mongoengine import connect
+
+    # Regular connect
+    connect('dbname', replicaset='rs-name')
+
+    # MongoDB URI-style connect
+    connect(host='mongodb://localhost/dbname?replicaSet=rs-name')
+
+Read preferences are supported through the connection or via individual
 queries by passing the read_preference ::

-    from pymongo import ReadPreference
-
    Bar.objects().read_preference(ReadPreference.PRIMARY)
    Bar.objects(read_preference=ReadPreference.PRIMARY)

@ -108,61 +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 be attached to different databases by providing a
+Individual documents can also support multiple databases by providing a
 `db_alias` in their meta data. This allows :class:`~pymongo.dbref.DBRef`
 objects to point across databases and collections. Below is an example schema,
 using 3 different databases to store data::

-        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.
@ -189,7 +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
@ -22,13 +22,11 @@ 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.

-.. _dynamic-document-schemas:
-
 Dynamic document schemas
 ========================
 One of the benefits of MongoDB is dynamic schemas for a collection, whilst data
@ -78,21 +76,17 @@ are as follows:
 * :class:`~mongoengine.fields.EmailField`
 * :class:`~mongoengine.fields.EmbeddedDocumentField`
 * :class:`~mongoengine.fields.EmbeddedDocumentListField`
-* :class:`~mongoengine.fields.EnumField`
 * :class:`~mongoengine.fields.FileField`
 * :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`
@ -159,7 +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'),
@ -179,21 +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
@ -233,9 +212,6 @@ document class as the first argument::
    comment2 = Comment(content='Nice article!')
    page = Page(comments=[comment1, comment2])

-Embedded documents can also leverage the flexibility of :ref:`dynamic-document-schemas:`
-by inheriting :class:`~mongoengine.DynamicEmbeddedDocument`.
-
 Dictionary Fields
 -----------------
 Often, an embedded document may be used instead of a dictionary – generally
@ -248,7 +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()
@ -295,12 +271,12 @@ as the constructor's argument::
        content = StringField()


-.. _many-to-many-with-listfields:
+.. _one-to-many-with-listfields:

-Many to Many with ListFields
+One to Many with ListFields
 '''''''''''''''''''''''''''

-If you are implementing a many to many relationship via a list of references,
+If you are implementing a one to many relationship via a list of references,
 then the references are stored as DBRefs and to query you need to pass an
 instance of the object to the query::

@ -341,6 +317,7 @@ supplying the :attr:`reverse_delete_rule` attributes on the
 :class:`ReferenceField` definition, like this::

    class ProfilePage(Document):
+        ...
        employee = ReferenceField('Employee', reverse_delete_rule=mongoengine.CASCADE)

 The declaration in this example means that when an :class:`Employee` object is
@ -357,7 +334,7 @@ Its value can take any of the following constants:
  Deletion is denied if there still exist references to the object being
  deleted.
 :const:`mongoengine.NULLIFY`
-  Any object's fields still referring to the object being deleted are set to None
+  Any object's fields still referring to the object being deleted are removed
  (using MongoDB's "unset" operation), effectively nullifying the relationship.
 :const:`mongoengine.CASCADE`
  Any object containing fields that are referring to the object being deleted
@ -431,15 +408,28 @@ either a single field name, or a list or tuple of field names::
        first_name = StringField()
        last_name = StringField(unique_with='first_name')

+Skipping Document validation on save
+------------------------------------
+You can also skip the whole document validation process by setting
+``validate=False`` when calling the :meth:`~mongoengine.document.Document.save`
+method::
+
+    class Recipient(Document):
+        name = StringField()
+        email = EmailField()
+
+    recipient = Recipient(name='admin', email='root@localhost')
+    recipient.save()               # will raise a ValidationError while
+    recipient.save(validate=False) # won't

 Document collections
 ====================
 Document classes that inherit **directly** from :class:`~mongoengine.Document`
 will have their own **collection** in the database. The name of the collection
-is by default the name of the class converted to snake_case (e.g if your Document class
-is named `CompanyUser`, the corresponding collection would be `company_user`). If you need
-to change the name of the collection (e.g. to use MongoEngine with an existing database),
-then create a class dictionary attribute called :attr:`meta` on your document, and
+is by default the name of the class, converted to lowercase (so in the example
+above, the collection would be called `page`). If you need to change the name
+of the collection (e.g. to use MongoEngine with an existing database), then
+create a class dictionary attribute called :attr:`meta` on your document, and
 set :attr:`collection` to the name of the collection that you want your
 document class to use::

@ -477,7 +467,7 @@ dictionary containing a full index definition.

 A direction may be specified on fields by prefixing the field name with a
 **+** (for ascending) or a **-** sign (for descending). Note that direction
-only matters on compound indexes. Text indexes may be specified by prefixing
+only matters on multi-field indexes. Text indexes may be specified by prefixing
 the field name with a **$**. Hashed indexes may be specified by prefixing
 the field name with a **#**::

@ -488,21 +478,19 @@ the field name with a **#**::
        created = DateTimeField()
        meta = {
            'indexes': [
-                'title',   # single-field index
+                'title',
                '$title',  # text index
                '#title',  # hashed index
-                ('title', '-rating'),  # compound index
-                ('category', '_cls'),  # compound index
+                ('title', '-rating'),
+                ('category', '_cls'),
                {
                    'fields': ['created'],
-                    'expireAfterSeconds': 3600  # ttl index
+                    'expireAfterSeconds': 3600
                }
            ]
        }

-If a dictionary is passed then additional options become available. Valid options include,
-but are not limited to:
-
+If a dictionary is passed then the following options are available:

 :attr:`fields` (Default: None)
    The fields to index. Specified in the same format as described above.
@ -523,15 +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
@ -543,15 +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)
-    Set any default index options - see the `full options list <https://docs.mongodb.com/manual/reference/method/db.collection.createIndex/#db.collection.createIndex>`_
+:attr:`index_options` (Optional)
+    Set any default index options - see the `full options list <http://docs.mongodb.org/manual/reference/method/db.collection.ensureIndex/#db.collection.ensureIndex>`_

 :attr:`index_background` (Optional)
    Set the default value for if an index should be indexed in the background
@ -559,11 +540,11 @@ 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
+
+.. note:: Since MongoDB 3.0 drop_dups is not supported anymore. Raises a Warning
+    and has no effect


 Compound Indexes and Indexing sub documents
@ -628,8 +609,8 @@ point. To create a geospatial index you must prefix the field with the
            ],
        }

-Time To Live (TTL) indexes
--------------------------
+Time To Live indexes
+--------------------

 A special index type that allows you to automatically expire data from a
 collection after a given period. See the official
@ -637,7 +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}
@ -700,16 +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
-routing (and thus the performance of your application) by specifying the shard
-key, using the :attr:`shard_key` attribute of
-:attr:`~mongoengine.Document.meta`. The shard key should be defined as a tuple.
-
-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
+If your collection is sharded, then you need to specify the shard key as a tuple,
+using the :attr:`shard_key` attribute of :attr:`~mongoengine.Document.meta`.
+This ensures that the shard key is sent with the query when calling the
+:meth:`~mongoengine.document.Document.save` or
+:meth:`~mongoengine.document.Document.update` method on an existing
 :class:`~mongoengine.Document` instance::

    class LogEntry(Document):
@ -719,8 +695,7 @@ methods such as :meth:`~mongoengine.document.Document.save`,
        data = StringField()

        meta = {
-            'shard_key': ('machine', 'timestamp'),
-            'indexes': ('machine', 'timestamp'),
+            'shard_key': ('machine', 'timestamp',)
        }

 .. _document-inheritance:
@ -730,7 +705,7 @@ Document inheritance

 To create a specialised type of a :class:`~mongoengine.Document` you have
 defined, you may subclass it and add any extra fields or methods you may need.
-As this new class is not a direct subclass of
+As this is new class is not a direct subclass of
 :class:`~mongoengine.Document`, it will not be stored in its own collection; it
 will use the same collection as its superclass uses. This allows for more
 convenient and efficient retrieval of related documents -- all you need do is
@ -750,30 +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
-
-When it comes to querying using :attr:`.objects()`, querying `Page.objects()` will query
-both `Page` and `DatedPage` whereas querying `DatedPage` will only query the `DatedPage` documents.
-Behind the scenes, MongoEngine deals with inheritance by adding a :attr:`_cls` attribute that contains
-the class name in every documents. When a document is loaded, MongoEngine checks
-it's :attr:`_cls` attribute and use that class to construct the instance.::
-
-    Page(title='a funky title').save()
-    DatedPage(title='another title', date=datetime.utcnow()).save()
-
-    print(Page.objects().count())         # 2
-    print(DatedPage.objects().count())    # 1
-
-    # print documents in their native form
-    # we remove 'id' to avoid polluting the output with unnecessary detail
-    qs = Page.objects.exclude('id').as_pymongo()
-    print(list(qs))
-    # [
-    #   {'_cls': u 'Page', 'title': 'a funky title'},
-    #   {'_cls': u 'Page.DatedPage', 'title': u 'another title', 'date': datetime.datetime(2019, 12, 13, 20, 16, 59, 993000)}
-    # ]
-
 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
@ -41,6 +41,34 @@ already exist, then any changes will be updated atomically.  For example::
 .. seealso::
    :ref:`guide-atomic-updates`

+Pre save data validation and cleaning
+-------------------------------------
+MongoEngine allows you to create custom cleaning rules for your documents when
+calling :meth:`~mongoengine.Document.save`.  By providing a custom
+:meth:`~mongoengine.Document.clean` method you can do any pre validation / data
+cleaning.
+
+This might be useful if you want to ensure a default value based on other
+document values for example::
+
+    class Essay(Document):
+        status = StringField(choices=('Published', 'Draft'), required=True)
+        pub_date = DateTimeField()
+
+        def clean(self):
+            """Ensures that only published essays have a `pub_date` and
+            automatically sets the pub_date if published and not set"""
+            if self.status == 'Draft' and self.pub_date is not None:
+                msg = 'Draft entries should not have a publication date.'
+                raise ValidationError(msg)
+            # Set the pub_date for published items if not set.
+            if self.status == 'Published' and self.pub_date is None:
+                self.pub_date = datetime.now()
+
+.. note::
+    Cleaning is only called if validation is turned on and when calling
+    :meth:`~mongoengine.Document.save`.
+
 Cascading Saves
 ---------------
 If your document contains :class:`~mongoengine.fields.ReferenceField` or
--- a/docs/guide/gridfs.rst
+++ b/docs/guide/gridfs.rst
@ -2,15 +2,16 @@
 GridFS
 ======

+.. versionadded:: 0.4
+
 Writing
 -------

 GridFS support comes in the form of the :class:`~mongoengine.fields.FileField` field
 object. This field acts as a file-like object and provides a couple of
 different ways of inserting and retrieving data. Arbitrary metadata such as
-content type can also be stored alongside the files. The object returned when accessing a
-FileField is a proxy to `Pymongo's GridFS <https://api.mongodb.com/python/current/examples/gridfs.html#gridfs-example>`_
-In the following example, a document is created to store details about animals, including a photo::
+content type can also be stored alongside the files. In the following example,
+a document is created to store details about animals, including a photo::

    class Animal(Document):
        genus = StringField()
@ -19,8 +20,8 @@ In the following example, a document is created to store details about animals,

    marmot = Animal(genus='Marmota', family='Sciuridae')

-    with open('marmot.jpg', 'rb') as fd:
-        marmot.photo.put(fd, content_type = 'image/jpeg')
+    marmot_photo = open('marmot.jpg', 'rb')
+    marmot.photo.put(marmot_photo, content_type = 'image/jpeg')
    marmot.save()

 Retrieval
@ -33,20 +34,6 @@ field. The file can also be retrieved just as easily::
    photo = marmot.photo.read()
    content_type = marmot.photo.content_type

-.. note:: If you need to read() the content of a file multiple times, you'll need to "rewind"
-    the file-like object using `seek`::
-
-        marmot = Animal.objects(genus='Marmota').first()
-        content1 = marmot.photo.read()
-        assert content1 != ""
-
-        content2 = marmot.photo.read()    # will be empty
-        assert content2 == ""
-
-        marmot.photo.seek(0)              # rewind the file by setting the current position of the cursor in the file to 0
-        content3 = marmot.photo.read()
-        assert content3 == content1
-
 Streaming
 ---------

@ -66,8 +53,7 @@ Deletion

 Deleting stored files is achieved with the :func:`delete` method::

-    marmot.photo.delete()    # Deletes the GridFS document
-    marmot.save()            # Saves the GridFS reference (being None) contained in the marmot instance
+    marmot.photo.delete()

 .. warning::

@ -85,5 +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.save()                                                   # Replaces the GridFS reference contained in marmot instance
+    marmot.photo.replace(another_marmot, content_type='image/png')
--- a/docs/guide/index.rst
+++ b/docs/guide/index.rst
@ -10,10 +10,7 @@ User Guide
   defining-documents
   document-instances
   querying
-   validation
   gridfs
   signals
   text-indexes
-   migration
-   logging-monitoring
   mongomock
--- a/docs/guide/installing.rst
+++ b/docs/guide/installing.rst
@ -12,7 +12,7 @@ MongoEngine is available on PyPI, so you can use :program:`pip`:

 .. code-block:: console

-    $ python -m pip install mongoengine
+    $ pip install mongoengine

 Alternatively, if you don't have setuptools installed, `download it from PyPi
 <http://pypi.python.org/pypi/mongoengine/>`_ and run
--- a/docs/guide/logging-monitoring.rst
+++ b/docs/guide/logging-monitoring.rst
@ -1,80 +0,0 @@
-==================
-Logging/Monitoring
-==================
-
-It is possible to use `pymongo.monitoring <https://api.mongodb.com/python/current/api/pymongo/monitoring.html>`_ to monitor
-the driver events (e.g: queries, connections, etc). This can be handy if you want to monitor the queries issued by
-MongoEngine to the driver.
-
-To use `pymongo.monitoring` with MongoEngine, you need to make sure that you are registering the listeners
-**before** establishing the database connection (i.e calling `connect`):
-
-The following snippet provides a basic logging of all command events:
-
-.. code-block:: python
-
-    import logging
-    from pymongo import monitoring
-    from mongoengine import *
-
-    log = logging.getLogger()
-    log.setLevel(logging.DEBUG)
-    logging.basicConfig(level=logging.DEBUG)
-
-
-    class CommandLogger(monitoring.CommandListener):
-
-        def started(self, event):
-            log.debug("Command {0.command_name} with request id "
-                     "{0.request_id} started on server "
-                     "{0.connection_id}".format(event))
-
-        def succeeded(self, event):
-            log.debug("Command {0.command_name} with request id "
-                     "{0.request_id} on server {0.connection_id} "
-                     "succeeded in {0.duration_micros} "
-                     "microseconds".format(event))
-
-        def failed(self, event):
-            log.debug("Command {0.command_name} with request id "
-                     "{0.request_id} on server {0.connection_id} "
-                     "failed in {0.duration_micros} "
-                     "microseconds".format(event))
-
-    monitoring.register(CommandLogger())
-
-
-    class Jedi(Document):
-        name = StringField()
-
-
-    connect()
-
-
-    log.info('GO!')
-
-    log.info('Saving an item through MongoEngine...')
-    Jedi(name='Obi-Wan Kenobii').save()
-
-    log.info('Querying through MongoEngine...')
-    obiwan = Jedi.objects.first()
-
-    log.info('Updating through MongoEngine...')
-    obiwan.name = 'Obi-Wan Kenobi'
-    obiwan.save()
-
-
-Executing this prints the following output::
-
-    INFO:root:GO!
-    INFO:root:Saving an item through MongoEngine...
-    DEBUG:root:Command insert with request id 1681692777 started on server ('localhost', 27017)
-    DEBUG:root:Command insert with request id 1681692777 on server ('localhost', 27017) succeeded in 562 microseconds
-    INFO:root:Querying through MongoEngine...
-    DEBUG:root:Command find with request id 1714636915 started on server ('localhost', 27017)
-    DEBUG:root:Command find with request id 1714636915 on server ('localhost', 27017) succeeded in 341 microseconds
-    INFO:root:Updating through MongoEngine...
-    DEBUG:root:Command update with request id 1957747793 started on server ('localhost', 27017)
-    DEBUG:root:Command update with request id 1957747793 on server ('localhost', 27017) succeeded in 455 microseconds
-
-More details can of course be obtained by checking the `event` argument from the `CommandListener`.
--- a/docs/guide/migration.rst
+++ b/docs/guide/migration.rst
@ -1,308 +0,0 @@
-===================
-Documents migration
-===================
-
-The structure of your documents and their associated mongoengine schemas are likely
-to change over the lifetime of an application. This section provides guidance and
-recommendations on how to deal with migrations.
-
-Due to the very flexible nature of mongodb, migrations of models aren't trivial and
-for people that know about `alembic` for `sqlalchemy`, there is unfortunately no equivalent
-library that will manage the migration in an automatic fashion for mongoengine.
-
-Example 1: Addition of a field
-==============================
-
-Let's start by taking a simple example of a model change and review the different option you
-have to deal with the migration.
-
-Let's assume we start with the following schema and save an instance:
-
-.. code-block:: python
-
-    class User(Document):
-        name = StringField()
-
-    User(name="John Doe").save()
-
-    # print the objects as they exist in mongodb
-    print(User.objects().as_pymongo())    # [{u'_id': ObjectId('5d06b9c3d7c1f18db3e7c874'), u'name': u'John Doe'}]
-
-On the next version of your application, let's now assume that a new field `enabled` gets added to the
-existing ``User`` model with a `default=True`. Thus you simply update the ``User`` class to the following:
-
-.. code-block:: python
-
-    class User(Document):
-        name = StringField(required=True)
-        enabled = BooleanField(default=True)
-
-Without applying any migration, we now reload an object from the database into the ``User`` class
-and checks its `enabled` attribute:
-
-.. code-block:: python
-
-    assert User.objects.count() == 1
-    user = User.objects().first()
-    assert user.enabled is True
-    assert User.objects(enabled=True).count() == 0    # uh?
-    assert User.objects(enabled=False).count() == 0   # uh?
-
-    # this is consistent with what we have in the database
-    # in fact, 'enabled' does not exist
-    print(User.objects().as_pymongo().first())    # {u'_id': ObjectId('5d06b9c3d7c1f18db3e7c874'), u'name': u'John'}
-    assert User.objects(enabled=None).count() == 1
-
-As you can see, even if the document wasn't updated, mongoengine applies the default value seamlessly when it
-loads the pymongo dict into a ``User`` instance. At first sight it looks like you don't need to migrate the
-existing documents when adding new fields but this actually leads to inconsistencies when it comes to querying.
-
-In fact, when querying, mongoengine isn't trying to account for the default value of the new field and so
-if you don't actually migrate the existing documents, you are taking a risk that querying/updating
-will be missing relevant record.
-
-When adding fields/modifying default values, you can use any of the following to do the migration
-as a standalone script:
-
-.. code-block:: python
-
-    # Use mongoengine to set a default value for a given field
-    User.objects().update(enabled=True)
-    # or use pymongo
-    user_coll = User._get_collection()
-    user_coll.update_many({}, {'$set': {'enabled': True}})
-
-
-Example 2: Inheritance change
-=============================
-
-Let's consider the following example:
-
-.. code-block:: python
-
-    class Human(Document):
-        name = StringField()
-        meta = {"allow_inheritance": True}
-
-    class Jedi(Human):
-        dark_side = BooleanField()
-        light_saber_color = StringField()
-
-    Jedi(name="Darth Vader", dark_side=True, light_saber_color="red").save()
-    Jedi(name="Obi Wan Kenobi", dark_side=False, light_saber_color="blue").save()
-
-    assert Human.objects.count() == 2
-    assert Jedi.objects.count() == 2
-
-    # Let's check how these documents got stored in mongodb
-    print(Jedi.objects.as_pymongo())
-    # [
-    #   {'_id': ObjectId('5fac4aaaf61d7fb06046e0f9'), '_cls': 'Human.Jedi', 'name': 'Darth Vader', 'dark_side': True, 'light_saber_color': 'red'},
-    #   {'_id': ObjectId('5fac4ac4f61d7fb06046e0fa'), '_cls': 'Human.Jedi', 'name': 'Obi Wan Kenobi', 'dark_side': False, 'light_saber_color': 'blue'}
-    # ]
-
-As you can observe, when you use inheritance, MongoEngine stores a field named '_cls' behind the scene to keep
-track of the Document class.
-
-Let's now take the scenario that you want to refactor the inheritance schema and:
- Have the Jedi's with dark_side=True/False become GoodJedi's/DarkSith
- get rid of the 'dark_side' field
-
-move to the following schemas:
-
-.. code-block:: python
-
-    # unchanged
-    class Human(Document):
-        name = StringField()
-        meta = {"allow_inheritance": True}
-
-    # attribute 'dark_side' removed
-    class GoodJedi(Human):
-        light_saber_color = StringField()
-
-    # new class
-    class BadSith(Human):
-        light_saber_color = StringField()
-
-MongoEngine doesn't know about the change or how to map them with the existing data
-so if you don't apply any migration, you will observe a strange behavior, as if the collection was suddenly
-empty.
-
-.. code-block:: python
-
-    # As a reminder, the documents that we inserted
-    # have the _cls field = 'Human.Jedi'
-
-    # Following has no match
-    # because the query that is used behind the scene is
-    # filtering on {'_cls': 'Human.GoodJedi'}
-    assert GoodJedi.objects().count() == 0
-
-    # Following has also no match
-    # because it is filtering on {'_cls': {'$in': ('Human', 'Human.GoodJedi', 'Human.BadSith')}}
-    # which has no match
-    assert Human.objects.count() == 0
-    assert Human.objects.first() is None
-
-    # If we bypass MongoEngine and make use of underlying driver (PyMongo)
-    # we can see that the documents are there
-    humans_coll = Human._get_collection()
-    assert humans_coll.count_documents({}) == 2
-    # print first document
-    print(humans_coll.find_one())
-    # {'_id': ObjectId('5fac4aaaf61d7fb06046e0f9'), '_cls': 'Human.Jedi', 'name': 'Darth Vader', 'dark_side': True, 'light_saber_color': 'red'}
-
-As you can see, first obvious problem is that we need to modify '_cls' values based on existing values of
-'dark_side' documents.
-
-.. code-block:: python
-
-    humans_coll = Human._get_collection()
-    old_class = 'Human.Jedi'
-    good_jedi_class = 'Human.GoodJedi'
-    bad_sith_class = 'Human.BadSith'
-    humans_coll.update_many({'_cls': old_class, 'dark_side': False}, {'$set': {'_cls': good_jedi_class}})
-    humans_coll.update_many({'_cls': old_class, 'dark_side': True}, {'$set': {'_cls': bad_sith_class}})
-
-Let's now check if querying improved in MongoEngine:
-
-.. code-block:: python
-
-    assert GoodJedi.objects().count() == 1  # Hoorah!
-    assert BadSith.objects().count() == 1   # Hoorah!
-    assert Human.objects.count() == 2       # Hoorah!
-
-    # let's now check that documents load correctly
-    jedi = GoodJedi.objects().first()
-    # raises FieldDoesNotExist: The fields "{'dark_side'}" do not exist on the document "Human.GoodJedi"
-
-In fact we only took care of renaming the _cls values but we havn't removed the 'dark_side' fields
-which does not exist anymore on the GoodJedi's and BadSith's models.
-Let's remove the field from the collections:
-
-.. code-block:: python
-
-    humans_coll = Human._get_collection()
-    humans_coll.update_many({}, {'$unset': {'dark_side': 1}})
-
-.. note:: We did this migration in 2 different steps for the sake of example but it could have been combined
-    with the migration of the _cls fields: ::
-
-        humans_coll.update_many(
-            {'_cls': old_class, 'dark_side': False},
-            {
-                '$set': {'_cls': good_jedi_class},
-                '$unset': {'dark_side': 1}
-            }
-        )
-
-
-And verify that the documents now load correctly:
-
-.. code-block:: python
-
-    jedi = GoodJedi.objects().first()
-    assert jedi.name == "Obi Wan Kenobi"
-
-    sith = BadSith.objects().first()
-    assert sith.name == "Darth Vader"
-
-
-An other way of dealing with this migration is to iterate over
-the documents and update/replace them one by one. This is way slower but
-it is often useful for complex migrations of Document models.
-
-.. code-block:: python
-
-    for doc in humans_coll.find():
-        if doc['_cls'] == 'Human.Jedi':
-            doc['_cls'] =  'Human.BadSith' if doc['dark_side'] else 'Human.GoodJedi'
-            doc.pop('dark_side')
-            humans_coll.replace_one({'_id': doc['_id']}, doc)
-
-.. warning:: Be aware of this `flaw <https://groups.google.com/g/mongodb-user/c/AFC1ia7MHzk>`_ if you modify documents while iterating
-
-Example 4: Index removal
-========================
-
-If you remove an index from your Document class, or remove an indexed Field from your Document class,
-you'll need to manually drop the corresponding index. MongoEngine will not do that for you.
-
-The way to deal with this case is to identify the name of the index to drop with `index_information()`, and then drop
-it with `drop_index()`
-
-Let's for instance assume that you start with the following Document class
-
-.. code-block:: python
-
-    class User(Document):
-        name = StringField(index=True)
-
-        meta = {"indexes": ["name"]}
-
-    User(name="John Doe").save()
-
-As soon as you start interacting with the Document collection (when `.save()` is called in this case),
-it would create the following indexes:
-
-.. code-block:: python
-
-    print(User._get_collection().index_information())
-    # {
-    #  '_id_': {'key': [('_id', 1)], 'v': 2},
-    #  'name_1': {'background': False, 'key': [('name', 1)], 'v': 2},
-    # }
-
-Thus: '_id' which is the default index and 'name_1' which is our custom index.
-If you would remove the 'name' field or its index, you would have to call:
-
-.. code-block:: python
-
-    User._get_collection().drop_index('name_1')
-
-.. note:: When adding new fields or new indexes, MongoEngine will take care of creating them
-    (unless `auto_create_index` is disabled) ::
-
-Recommendations
-===============
-
- Write migration scripts whenever you do changes to the model schemas
- Using :class:`~mongoengine.DynamicDocument` or ``meta = {"strict": False}`` may help to avoid some migrations or to have the 2 versions of your application to co-exist.
- Write post-processing checks to verify that migrations script worked. See below
-
-Post-processing checks
-======================
-
-The following recipe can be used to sanity check a Document collection after you applied migration.
-It does not make any assumption on what was migrated, it will fetch 1000 objects randomly and
-run some quick checks on the documents to make sure the document looks OK. As it is, it will fail
-on the first occurrence of an error but this is something that can be adapted based on your needs.
-
-.. code-block:: python
-
-    def get_random_oids(collection, sample_size):
-        pipeline = [{"$project": {'_id': 1}}, {"$sample": {"size": sample_size}}]
-        return [s['_id'] for s in collection.aggregate(pipeline)]
-
-    def get_random_documents(DocCls, sample_size):
-        doc_collection = DocCls._get_collection()
-        random_oids = get_random_oids(doc_collection, sample_size)
-        return DocCls.objects(id__in=random_oids)
-
-    def check_documents(DocCls, sample_size):
-        for doc in get_random_documents(DocCls, sample_size):
-            # general validation (types and values)
-            doc.validate()
-
-            # load all subfields,
-            # this may trigger additional queries if you have ReferenceFields
-            # so it may be slow
-            for field in doc._fields:
-                try:
-                    getattr(doc, field)
-                except Exception:
-                    LOG.warning(f"Could not load field {field} in Document {doc.id}")
-                    raise
-
-    check_documents(Human, sample_size=1000)
--- a/docs/guide/mongomock.rst
+++ b/docs/guide/mongomock.rst
@ -2,10 +2,10 @@
 Use mongomock for testing
 ==============================

-`mongomock <https://github.com/vmalloc/mongomock/>`_ is a package to do just
+`mongomock <https://github.com/vmalloc/mongomock/>`_ is a package to do just 
 what the name implies, mocking a mongo database.

-To use with mongoengine, simply specify mongomock when connecting with
+To use with mongoengine, simply specify mongomock when connecting with 
 mongoengine:

 .. code-block:: python
@ -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()
-            assert 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
@ -86,10 +86,6 @@ expressions:
 * ``istartswith`` -- string field starts with value (case insensitive)
 * ``endswith`` -- string field ends with value
 * ``iendswith`` -- string field ends with value (case insensitive)
-* ``wholeword`` -- string field contains whole word
-* ``iwholeword`` -- string field contains whole word (case insensitive)
-* ``regex`` -- string field match by regex
-* ``iregex`` -- string field match by regex (case insensitive)
 * ``match``  -- performs an $elemMatch so you can match an entire document within an array


@ -226,24 +222,12 @@ keyword argument::

 .. versionadded:: 0.4

-Sorting/Ordering results
-========================
-It is possible to order the results by 1 or more keys using :meth:`~mongoengine.queryset.QuerySet.order_by`.
-The order may be specified by prepending each of the keys by "+" or "-". Ascending order is assumed if there's no prefix.::
-
-    # Order by ascending date
-    blogs = BlogPost.objects().order_by('date')    # equivalent to .order_by('+date')
-
-    # Order by ascending date first, then descending title
-    blogs = BlogPost.objects().order_by('+date', '-title')
-
-
 Limiting and skipping results
 =============================
 Just as with traditional ORMs, you may limit the number of results returned or
 skip a number or results in you query.
 :meth:`~mongoengine.queryset.QuerySet.limit` and
-:meth:`~mongoengine.queryset.QuerySet.skip` methods are available on
+:meth:`~mongoengine.queryset.QuerySet.skip` and methods are available on
 :class:`~mongoengine.queryset.QuerySet` objects, but the `array-slicing` syntax
 is preferred for achieving this::

@ -365,9 +349,9 @@ Just as with limiting and skipping results, there is a method on a
 You could technically use ``len(User.objects)`` to get the same result, but it
 would be significantly slower than :meth:`~mongoengine.queryset.QuerySet.count`.
 When you execute a server-side count query, you let MongoDB do the heavy
-lifting and you receive a single integer over the wire. Meanwhile, ``len()``
+lifting and you receive a single integer over the wire. Meanwhile, len()
 retrieves all the results, places them in a local cache, and finally counts
-them. If we compare the performance of the two operations, ``len()`` is much slower
+them. If we compare the performance of the two operations, len() is much slower
 than :meth:`~mongoengine.queryset.QuerySet.count`.

 Further aggregation
@ -402,25 +386,6 @@ would be generating "tag-clouds"::
    top_tags = sorted(tag_freqs.items(), key=itemgetter(1), reverse=True)[:10]


-MongoDB aggregation API
-----------------------
-If you need to run aggregation pipelines, MongoEngine provides an entry point to `Pymongo's aggregation framework <https://api.mongodb.com/python/current/examples/aggregation.html#aggregation-framework>`_
-through :meth:`~mongoengine.queryset.QuerySet.aggregate`. Check out Pymongo's documentation for the syntax and pipeline.
-An example of its use would be::
-
-        class Person(Document):
-            name = StringField()
-
-        Person(name='John').save()
-        Person(name='Bob').save()
-
-        pipeline = [
-            {"$sort" : {"name" : -1}},
-            {"$project": {"_id": 0, "name": {"$toUpper": "$name"}}}
-            ]
-        data = Person.objects().aggregate(pipeline)
-        assert data == [{'name': 'BOB'}, {'name': 'JOHN'}]
-
 Query efficiency and performance
 ================================

@ -491,14 +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))
@ -547,10 +512,7 @@ Documents may be updated atomically by using the
 There are several different "modifiers" that you may use with these methods:

 * ``set`` -- set a particular value
-* ``set_on_insert`` -- set only if this is new document  `need to add upsert=True`_
 * ``unset`` -- delete a particular value (since MongoDB v1.3)
-* ``max`` -- update only if value is bigger
-* ``min`` -- update only if value is smaller
 * ``inc`` -- increment a value by a given amount
 * ``dec`` -- decrement a value by a given amount
 * ``push`` -- append a value to a list
@ -559,7 +521,6 @@ There are several different "modifiers" that you may use with these methods:
 * ``pull`` -- remove a value from a list
 * ``pull_all`` -- remove several values from a list
 * ``add_to_set`` -- add value to a list only if its not in the list already
-* ``rename`` -- rename the key name

 .. _depending on the value: http://docs.mongodb.org/manual/reference/operator/update/pop/

@ -604,20 +565,10 @@ 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
-    operator <https://docs.mongodb.com/manual/tutorial/update-documents/#Updating-The%24positionaloperator>`_.
+    operator <http://www.mongodb.org/display/DOCS/Updating#Updating-The%24positionaloperator>`_.

 Server-side javascript execution
 ================================
--- 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
-  (validation, insert/update, and cascades, but not clearing dirty flags) have
-  completed successfully.  Passed the additional boolean keyword argument
-  `created` to indicate if the save was an insert or an update.
+  Called within :meth:`~mongoengine.Document.save` after all actions
+  (validation, insert/update, cascades, clearing dirty flags) have completed
+  successfully.  Passed the additional boolean keyword argument `created` to
+  indicate if the save was an insert or an update.

 `pre_delete`
  Called within :meth:`~mongoengine.Document.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
@ -8,7 +8,7 @@ After MongoDB 2.4 version, supports search documents by text indexes.
 Defining a Document with text index
 ===================================
 Use the *$* prefix to set a text index, Look the declaration::
-
+  
  class News(Document):
      title = StringField()
      content = StringField()
@ -35,10 +35,10 @@ Saving a document::
       content="Various improvements").save()

 Next, start a text search using :attr:`QuerySet.search_text` method::
-
+  
  document = News.objects.search_text('testing').first()
  document.title # may be: "Using mongodb text search"
-
+  
  document = News.objects.search_text('released').first()
  document.title # may be: "MongoEngine 0.9 released"

@ -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/guide/validation.rst
+++ b/docs/guide/validation.rst
@ -1,122 +0,0 @@
-====================
-Document Validation
-====================
-
-By design, MongoEngine strictly validates the documents right before they are inserted in MongoDB
-and makes sure they are consistent with the fields defined in your models.
-
-MongoEngine makes the assumption that the documents that exists in the DB are compliant with the schema.
-This means that Mongoengine will not validate a document when an object is loaded from the DB into an instance
-of your model but this operation may fail under some circumstances (e.g. if there is a field in
-the document fetched from the database that is not defined in your model).
-
-
-Built-in validation
-===================
-
-Mongoengine provides different fields that encapsulate the corresponding validation
-out of the box. Validation runs when calling `.validate()` or `.save()`
-
-.. code-block:: python
-
-    from mongoengine import Document, EmailField
-
-    class User(Document):
-        email = EmailField()
-        age = IntField(min_value=0, max_value=99)
-
-    user = User(email='invalid@', age=24)
-    user.validate()     # raises ValidationError (Invalid email address: ['email'])
-    user.save()         # raises ValidationError (Invalid email address: ['email'])
-
-    user2 = User(email='john.doe@garbage.com', age=1000)
-    user2.save()        # raises ValidationError (Integer value is too large: ['age'])
-
-Custom validation
-=================
-
-The following feature can be used to customize the validation:
-
-* Field `validation` parameter
-
-.. code-block:: python
-
-    def not_john_doe(name):
-        if name == 'John Doe':
-            raise ValidationError("John Doe is not a valid name")
-
-    class Person(Document):
-        full_name = StringField(validation=not_john_doe)
-
-    Person(full_name='Billy Doe').save()
-    Person(full_name='John Doe').save()  # raises ValidationError (John Doe is not a valid name)
-
-
-* Document `clean` method
-
-This method is called as part of :meth:`~mongoengine.document.Document.save` and should be used to provide
-custom model validation and/or to modify some of the field values prior to validation.
-For instance, you could use it to automatically provide a value for a field, or to do validation
-that requires access to more than a single field.
-
-.. code-block:: python
-
-    class Essay(Document):
-        status = StringField(choices=('Published', 'Draft'), required=True)
-        pub_date = DateTimeField()
-
-        def clean(self):
-            # Validate that only published essays have a `pub_date`
-            if self.status == 'Draft' and self.pub_date is not None:
-                raise ValidationError('Draft entries should not have a publication date.')
-            # Set the pub_date for published items if not set.
-            if self.status == 'Published' and self.pub_date is None:
-                self.pub_date = datetime.now()
-
-.. note::
-    Cleaning is only called if validation is turned on and when calling
-    :meth:`~mongoengine.Document.save`.
-
-* Adding custom Field classes
-
-We recommend as much as possible to use fields provided by MongoEngine. However, it is also possible
-to subclass a Field and encapsulate some validation by overriding the `validate` method
-
-.. code-block:: python
-
-    class AgeField(IntField):
-
-        def validate(self, value):
-            super(AgeField, self).validate(value)     # let IntField.validate run first
-            if value == 60:
-                self.error('60 is not allowed')
-
-    class Person(Document):
-        age = AgeField(min_value=0, max_value=99)
-
-    Person(age=20).save()   # passes
-    Person(age=1000).save() # raises ValidationError (Integer value is too large: ['age'])
-    Person(age=60).save()   # raises ValidationError (Person:None) (60 is not allowed: ['age'])
-
-
-.. note::
-
-   When overriding `validate`, use `self.error("your-custom-error")` instead of raising ValidationError explicitly,
-   it will provide a better context with the error message
-
-Skipping validation
-====================
-
-Although discouraged as it allows to violate fields constraints, if for some reason you need to disable
-the validation and cleaning of a document when you call :meth:`~mongoengine.document.Document.save`, you can use `.save(validate=False)`.
-
-.. code-block:: python
-
-    class Person(Document):
-        age = IntField(max_value=100)
-
-    Person(age=1000).save()    # raises ValidationError (Integer value is too large)
-
-    Person(age=1000).save(validate=False)
-    person = Person.objects.first()
-    assert person.age == 1000
--- a/docs/index.rst
+++ b/docs/index.rst
@ -7,7 +7,7 @@ MongoDB. To install it, simply run

 .. code-block:: console

-    $ python -m pip install -U mongoengine
+    $ pip install -U mongoengine

 :doc:`tutorial`
  A quick tutorial building a tumblelog to get you up and running with
@ -23,18 +23,9 @@ MongoDB. To install it, simply run
 :doc:`upgrade`
  How to upgrade MongoEngine.

-:doc:`faq`
-  Frequently Asked Questions
-
 :doc:`django`
  Using MongoEngine and Django

-MongoDB and driver support
--------------------------
-
-MongoEngine is based on the PyMongo driver and tested against multiple versions of MongoDB.
-For further details, please refer to the `readme <https://github.com/MongoEngine/mongoengine#mongoengine>`_.
-
 Community
 ---------

@ -82,7 +73,6 @@ formats for offline reading.
    apireference
    changelog
    upgrade
-    faq
    django

 Indices and tables
@ -91,3 +81,4 @@ Indices and tables
 * :ref:`genindex`
 * :ref:`modindex`
 * :ref:`search`
+
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@ -1,3 +0,0 @@
-Sphinx==3.3.0
-sphinx-rtd-theme==0.5.0
-readthedocs-sphinx-ext==2.1.1
--- a/docs/tutorial.rst
+++ b/docs/tutorial.rst
@ -18,7 +18,7 @@ location --- running it locally will be easier, but if that is not an option
 then it may be run on a remote server. If you haven't installed MongoEngine,
 simply use pip to install it like so::

-    $ python -m pip install mongoengine
+    $ pip install mongoengine

 Before we can start using MongoEngine, we need to tell it how to connect to our
 instance of :program:`mongod`. For this we use the :func:`~mongoengine.connect`
@ -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
-``ross``.
-
-Now that we've got our users in the database, let's add a couple of posts::
+Now that we've got our user 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.
@ -52,7 +21,7 @@ rename its occurrences.
 This release includes a major rehaul of MongoEngine's code quality and
 introduces a few breaking changes. It also touches many different parts of
 the package and although all the changes have been tested and scrutinized,
-you're encouraged to thoroughly test the upgrade.
+you're encouraged to thorougly test the upgrade.

 First breaking change involves renaming `ConnectionError` to `MongoEngineConnectionError`.
 If you import or catch this exception, you'll need to rename it in your code.
@ -85,10 +54,10 @@ by default from now on.

 The 0.8.7 package on pypi was corrupted.  If upgrading from 0.8.7 to 0.9.0 please follow: ::

-    python -m pip uninstall pymongo
-    python -m pip uninstall mongoengine
-    python -m pip install pymongo==2.8
-    python -m pip install mongoengine
+    pip uninstall pymongo
+    pip uninstall mongoengine
+    pip install pymongo==2.8
+    pip install mongoengine

 0.8.7
 *****
@ -153,7 +122,7 @@ inherited classes like so: ::

    # 4. Remove indexes
    info = collection.index_information()
-    indexes_to_drop = [key for key, value in info.items()
+    indexes_to_drop = [key for key, value in info.iteritems()
                       if '_types' in dict(value['key'])]
    for index in indexes_to_drop:
        collection.drop_index(index)
--- a/mongoengine/init.py
+++ b/mongoengine/init.py
@ -1,43 +1,36 @@
 # Import submodules so that we can expose their __all__
-from mongoengine import (
-    connection,
-    document,
-    errors,
-    fields,
-    queryset,
-    signals,
-)
+from mongoengine import connection
+from mongoengine import document
+from mongoengine import errors
+from mongoengine import fields
+from mongoengine import queryset
+from mongoengine import signals

 # Import everything from each submodule so that it can be accessed via
 # mongoengine, e.g. instead of `from mongoengine.connection import connect`,
 # users can simply use `from mongoengine import connect`, or even
 # `from mongoengine import *` and then `connect('testdb')`.
-from mongoengine.connection import *  # noqa: F401
-from mongoengine.document import *  # noqa: F401
-from mongoengine.errors import *  # noqa: F401
-from mongoengine.fields import *  # noqa: F401
-from mongoengine.queryset import *  # noqa: F401
-from mongoengine.signals import *  # noqa: F401
-
-__all__ = (
-    list(document.__all__)
-    + list(fields.__all__)
-    + list(connection.__all__)
-    + list(queryset.__all__)
-    + list(signals.__all__)
-    + list(errors.__all__)
-)
+from mongoengine.connection import *
+from mongoengine.document import *
+from mongoengine.errors import *
+from mongoengine.fields import *
+from mongoengine.queryset import *
+from mongoengine.signals import *


-VERSION = (0, 23, 1)
+__all__ = (list(document.__all__) + list(fields.__all__) +
+           list(connection.__all__) + list(queryset.__all__) +
+           list(signals.__all__) + list(errors.__all__))
+
+
+VERSION = (0, 11, 0)


 def get_version():
-    """Return the VERSION as a string.
-
-    For example, if `VERSION == (0, 10, 7)`, return '0.10.7'.
+    """Return the VERSION as a string, e.g. for VERSION == (0, 10, 7),
+    return '0.10.7'.
    """
-    return ".".join(map(str, VERSION))
+    return '.'.join(map(str, VERSION))


 __version__ = get_version()
--- a/mongoengine/base/init.py
+++ b/mongoengine/base/init.py
@ -12,22 +12,17 @@ from mongoengine.base.metaclasses import *

 __all__ = (
    # common
-    "UPDATE_OPERATORS",
-    "_document_registry",
-    "get_document",
+    'UPDATE_OPERATORS', '_document_registry', 'get_document',
+
    # datastructures
-    "BaseDict",
-    "BaseList",
-    "EmbeddedDocumentList",
-    "LazyReference",
+    'BaseDict', 'BaseList', 'EmbeddedDocumentList',
+
    # document
-    "BaseDocument",
+    'BaseDocument',
+
    # fields
-    "BaseField",
-    "ComplexBaseField",
-    "ObjectIdField",
-    "GeoJsonBaseField",
+    'BaseField', 'ComplexBaseField', 'ObjectIdField', 'GeoJsonBaseField',
+
    # metaclasses
-    "DocumentMetaclass",
-    "TopLevelDocumentMetaclass",
+    'DocumentMetaclass', 'TopLevelDocumentMetaclass'
 )
--- a/mongoengine/base/common.py
+++ b/mongoengine/base/common.py
@ -1,62 +1,31 @@
 from mongoengine.errors import NotRegistered

-__all__ = ("UPDATE_OPERATORS", "get_document", "_document_registry")
+__all__ = ('UPDATE_OPERATORS', 'get_document', '_document_registry')


-UPDATE_OPERATORS = {
-    "set",
-    "unset",
-    "inc",
-    "dec",
-    "mul",
-    "pop",
-    "push",
-    "push_all",
-    "pull",
-    "pull_all",
-    "add_to_set",
-    "set_on_insert",
-    "min",
-    "max",
-    "rename",
-}
+UPDATE_OPERATORS = set(['set', 'unset', 'inc', 'dec', 'pop', 'push',
+                        'push_all', 'pull', 'pull_all', 'add_to_set',
+                        'set_on_insert', '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 if k.endswith(compound_end) or k == single_end
-        ]
+        single_end = name.split('.')[-1]
+        compound_end = '.%s' % single_end
+        possible_match = [k for k in _document_registry.keys()
+                          if k.endswith(compound_end) or k == single_end]
        if len(possible_match) == 1:
            doc = _document_registry.get(possible_match.pop(), None)
    if not doc:
-        raise NotRegistered(
-            """
+        raise NotRegistered("""
            `%s` has not been registered in the document registry.
            Importing the document class automatically registers it, has it
            been imported?
-        """.strip()
-            % name
-        )
+        """.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
@ -1,41 +1,12 @@
+import itertools
 import weakref

-from bson import DBRef
+import six

 from mongoengine.common import _import_class
 from mongoengine.errors import DoesNotExist, MultipleObjectsReturned

-__all__ = (
-    "BaseDict",
-    "StrictDict",
-    "BaseList",
-    "EmbeddedDocumentList",
-    "LazyReference",
-)
-
-
-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
+__all__ = ('BaseDict', 'BaseList', 'EmbeddedDocumentList')


 class BaseDict(dict):
@ -46,36 +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().__init__(dict_items)
+        super(BaseDict, self).__init__(dict_items)

-    def get(self, key, default=None):
-        # 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, *args, **kwargs):
+        value = super(BaseDict, self).__getitem__(key)

-    def __getitem__(self, key):
-        value = super().__getitem__(key)
-
-        EmbeddedDocument = _import_class("EmbeddedDocument")
+        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):
-            value = BaseDict(value, None, f"{self._name}.{key}")
-            super().__setitem__(key, value)
+        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):
-            value = BaseList(value, None, f"{self._name}.{key}")
-            super().__setitem__(key, value)
+        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
@ -85,19 +66,30 @@ class BaseDict(dict):
        self = state
        return self

-    __setitem__ = mark_key_as_changed_wrapper(dict.__setitem__)
-    __delattr__ = mark_key_as_changed_wrapper(dict.__delattr__)
-    __delitem__ = mark_key_as_changed_wrapper(dict.__delitem__)
-    pop = mark_as_changed_wrapper(dict.pop)
-    clear = mark_as_changed_wrapper(dict.clear)
-    update = mark_as_changed_wrapper(dict.update)
-    popitem = mark_as_changed_wrapper(dict.popitem)
-    setdefault = mark_as_changed_wrapper(dict.setdefault)
+    def clear(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).clear()
+
+    def pop(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).pop(*args, **kwargs)
+
+    def popitem(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseDict, self).popitem()
+
+    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"):
+        if hasattr(self._instance, '_mark_as_changed'):
            if key:
-                self._instance._mark_as_changed(f"{self._name}.{key}")
+                self._instance._mark_as_changed('%s.%s' % (self._name, key))
            else:
                self._instance._mark_as_changed(self._name)

@ -110,41 +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().__init__(list_items)
+        super(BaseList, self).__init__(list_items)

-    def __getitem__(self, key):
-        # change index to positive value because MongoDB does not support negative one
-        if isinstance(key, int) and key < 0:
-            key = len(self) + key
-        value = super().__getitem__(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")
+        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):
-            # Replace dict by BaseDict
-            value = BaseDict(value, None, f"{self._name}.{key}")
-            super().__setitem__(key, value)
+        elif not isinstance(value, BaseDict) and isinstance(value, dict):
+            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):
-            # Replace list by BaseList
-            value = BaseList(value, None, f"{self._name}.{key}")
-            super().__setitem__(key, value)
+        elif not isinstance(value, BaseList) and isinstance(value, list):
+            value = BaseList(value, None, '%s.%s' % (self._name, key))
+            super(BaseList, self).__setitem__(key, value)
            value._instance = self._instance
        return value

    def __iter__(self):
-        yield from super().__iter__()
+        for i in xrange(self.__len__()):
+            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
@ -155,40 +158,53 @@ class BaseList(list):
        self = state
        return self

-    def __setitem__(self, key, value):
-        changed_key = key
-        if isinstance(key, slice):
-            # 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
+    def __iadd__(self, other):
+        self._mark_as_changed()
+        return super(BaseList, self).__iadd__(other)

-        result = super().__setitem__(key, value)
-        self._mark_as_changed(changed_key)
-        return result
+    def __imul__(self, other):
+        self._mark_as_changed()
+        return super(BaseList, self).__imul__(other)

-    append = mark_as_changed_wrapper(list.append)
-    extend = mark_as_changed_wrapper(list.extend)
-    insert = mark_as_changed_wrapper(list.insert)
-    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__)
+    def append(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).append(*args, **kwargs)
+
+    def extend(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).extend(*args, **kwargs)
+
+    def insert(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).insert(*args, **kwargs)
+
+    def pop(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).pop(*args, **kwargs)
+
+    def remove(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).remove(*args, **kwargs)
+
+    def reverse(self, *args, **kwargs):
+        self._mark_as_changed()
+        return super(BaseList, self).reverse()
+
+    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"):
-            if key is not None:
-                self._instance._mark_as_changed(f"{self._name}.{key % len(self)}")
+        if hasattr(self._instance, '_mark_as_changed'):
+            if key:
+                self._instance._mark_as_changed(
+                    '%s.%s' % (self._name, key % len(self))
+                )
            else:
                self._instance._mark_as_changed(self._name)


 class EmbeddedDocumentList(BaseList):
-    def __init__(self, list_items, instance, name):
-        super().__init__(list_items, instance, name)
-        self._instance = instance

    @classmethod
    def __match_all(cls, embedded_doc, kwargs):
@ -197,7 +213,7 @@ class EmbeddedDocumentList(BaseList):
        """
        for key, expected_value in kwargs.items():
            doc_val = getattr(embedded_doc, key)
-            if doc_val != expected_value and str(doc_val) != expected_value:
+            if doc_val != expected_value and six.text_type(doc_val) != expected_value:
                return False
        return True

@ -208,14 +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.*
@ -270,10 +287,12 @@ class EmbeddedDocumentList(BaseList):
        """
        values = self.__only_matches(self, kwargs)
        if len(values) == 0:
-            raise DoesNotExist("%s matching query does not exist." % self._name)
+            raise DoesNotExist(
+                '%s matching query does not exist.' % self._name
+            )
        elif len(values) > 1:
            raise MultipleObjectsReturned(
-                "%d items returned, instead of 1" % len(values)
+                '%d items returned, instead of 1' % len(values)
            )

        return values[0]
@ -287,11 +306,11 @@ class EmbeddedDocumentList(BaseList):

    def create(self, **values):
        """
-        Creates a new instance of the EmbeddedDocument and appends it to this EmbeddedDocumentList.
+        Creates a new embedded document and saves it to the database.

        .. note::
-            the instance of the EmbeddedDocument is not automatically saved to the database.
-            You still need to call .save() on the parent Document.
+            The embedded document changes are not automatically saved
+            to the database after calling this method.

        :param values: A dictionary of values for the embedded document.
        :return: The new embedded document instance.
@ -331,8 +350,7 @@ class EmbeddedDocumentList(BaseList):

    def update(self, **update):
        """
-        Updates the embedded documents with the given replacement values. This
-        function does not support mongoDB update operators such as ``inc__``.
+        Updates the embedded documents with the given update values.

        .. note::
            The embedded document changes are not automatically saved
@ -352,24 +370,24 @@ class EmbeddedDocumentList(BaseList):
        return len(values)


-class StrictDict:
+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 kwargs.items():
+        for k, v in kwargs.iteritems():
            setattr(self, k, v)

    def __getitem__(self, key):
-        key = "_reserved_" + key if key in self._special_fields else key
+        key = '_reserved_' + key if key in self._special_fields else key
        try:
            return getattr(self, key)
        except AttributeError:
            raise KeyError(key)

    def __setitem__(self, key, value):
-        key = "_reserved_" + key if key in self._special_fields else key
+        key = '_reserved_' + key if key in self._special_fields else key
        return setattr(self, key, value)

    def __contains__(self, key):
@ -406,68 +424,63 @@ class StrictDict:
        return (key for key in self.__slots__ if hasattr(self, key))

    def __len__(self):
-        return len(list(self.items()))
+        return len(list(self.iteritems()))

    def __eq__(self, other):
-        return list(self.items()) == list(other.items())
+        return self.items() == other.items()

    def __ne__(self, other):
-        return not (self == other)
+        return self.items() != other.items()

    @classmethod
    def create(cls, allowed_keys):
-        allowed_keys_tuple = tuple(
-            ("_reserved_" + k if k in cls._special_fields else k) for k in allowed_keys
-        )
+        allowed_keys_tuple = tuple(('_reserved_' + k if k in cls._special_fields else k) for k in allowed_keys)
        allowed_keys = frozenset(allowed_keys_tuple)
        if allowed_keys not in cls._classes:
-
            class SpecificStrictDict(cls):
                __slots__ = allowed_keys_tuple

                def __repr__(self):
-                    return "{%s}" % ", ".join(
-                        f'"{k!s}": {v!r}' for k, v in self.items()
-                    )
+                    return '{%s}' % ', '.join('"{0!s}": {1!r}'.format(k, v) for k, v in self.items())

            cls._classes[allowed_keys] = SpecificStrictDict
        return cls._classes[allowed_keys]


-class LazyReference(DBRef):
-    __slots__ = ("_cached_doc", "passthrough", "document_type")
+class SemiStrictDict(StrictDict):
+    __slots__ = ('_extras', )
+    _classes = {}

-    def fetch(self, force=False):
-        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().__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()
+    def __getattr__(self, attr):
        try:
-            return document[name]
-        except KeyError:
-            raise AttributeError()
+            super(SemiStrictDict, self).__getattr__(attr)
+        except AttributeError:
+            try:
+                return self.__getattribute__('_extras')[attr]
+            except KeyError as e:
+                raise AttributeError(e)

-    def __repr__(self):
-        return f"<LazyReference({self.document_type}, {self.pk!r})>"
+    def __setattr__(self, attr, value):
+        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
--- a/mongoengine/base/fields.py
+++ b/mongoengine/base/fields.py
@ -1,27 +1,29 @@
 import operator
+import warnings
 import weakref

+from bson import DBRef, ObjectId, SON
 import pymongo
-from bson import SON, DBRef, ObjectId
+import six

 from mongoengine.base.common import UPDATE_OPERATORS
-from mongoengine.base.datastructures import (
-    BaseDict,
-    BaseList,
-    EmbeddedDocumentList,
-)
+from mongoengine.base.datastructures import (BaseDict, BaseList,
+                                             EmbeddedDocumentList)
 from mongoengine.common import _import_class
-from mongoengine.errors import DeprecatedError, ValidationError
-
-__all__ = ("BaseField", "ComplexBaseField", "ObjectIdField", "GeoJsonBaseField")
+from mongoengine.errors import ValidationError


-class BaseField:
+__all__ = ('BaseField', 'ComplexBaseField', 'ObjectIdField',
+           'GeoJsonBaseField')
+
+
+class BaseField(object):
    """A base class for fields in a MongoDB document. Instances of this class
    may be added to subclasses of `Document` to define a document's schema.
-    """

-    name = None  # set in TopLevelDocumentMetaclass
+    .. versionchanged:: 0.5 - added verbose and help text
+    """
+    name = None
    _geo_index = False
    _auto_gen = False  # Call `generate` to generate a value
    _auto_dereference = True
@ -32,23 +34,14 @@ class BaseField:
    creation_counter = 0
    auto_creation_counter = -1

-    def __init__(
-        self,
-        db_field=None,
-        required=False,
-        default=None,
-        unique=False,
-        unique_with=None,
-        primary_key=False,
-        validation=None,
-        choices=None,
-        null=False,
-        sparse=False,
-        **kwargs,
-    ):
+    def __init__(self, db_field=None, name=None, required=False, default=None,
+                 unique=False, unique_with=None, primary_key=False,
+                 validation=None, choices=None, null=False, sparse=False,
+                 **kwargs):
        """
        :param db_field: The database field to store this field in
            (defaults to the name of the field)
+        :param name: Deprecated - use db_field
        :param required: If the field is required. Whether it has to have a
            value or not. Defaults to False.
        :param default: (optional) The default value for this field if no value
@ -59,10 +52,10 @@ class BaseField:
            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
-            a ValidationError if validation fails
+            field.  Generally this is deprecated in favour of the
+            `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
@ -72,8 +65,11 @@ class BaseField:
            existing attributes. Common metadata includes `verbose_name` and
            `help_text`.
        """
-        self.db_field = db_field if not primary_key else "_id"
+        self.db_field = (db_field or name) if not primary_key else '_id'

+        if name:
+            msg = 'Field\'s "name" attribute deprecated in favour of "db_field"'
+            warnings.warn(msg, DeprecationWarning)
        self.required = required or primary_key
        self.default = default
        self.unique = bool(unique or unique_with)
@ -85,15 +81,11 @@ class BaseField:
        self.sparse = sparse
        self._owner_document = None

-        # Make sure db_field is a string (if it's explicitly defined).
-        if self.db_field is not None and not isinstance(self.db_field, str):
-            raise TypeError("db_field should be a string.")
-
-        # Make sure db_field doesn't contain any forbidden characters.
-        if isinstance(self.db_field, str) and (
-            "." in self.db_field
-            or "\0" in self.db_field
-            or self.db_field.startswith("$")
+        # Validate the db_field
+        if isinstance(self.db_field, six.string_types) and (
+            '.' in self.db_field or
+            '\0' in self.db_field or
+            self.db_field.startswith('$')
        ):
            raise ValueError(
                'field names cannot contain dots (".") or null characters '
@ -103,17 +95,15 @@ class BaseField:
        # Detect and report conflicts between metadata and base properties.
        conflicts = set(dir(self)) & set(kwargs)
        if conflicts:
-            raise TypeError(
-                "%s already has attribute(s): %s"
-                % (self.__class__.__name__, ", ".join(conflicts))
-            )
+            raise TypeError('%s already has attribute(s): %s' % (
+                self.__class__.__name__, ', '.join(conflicts)))

        # Assign metadata to the instance
        # This efficient method is available because no __slots__ are defined.
        self.__dict__.update(kwargs)

        # Adjust the appropriate creation counter, and save our local copy.
-        if self.db_field == "_id":
+        if self.db_field == '_id':
            self.creation_counter = BaseField.auto_creation_counter
            BaseField.auto_creation_counter -= 1
        else:
@ -121,7 +111,8 @@ class BaseField:
            BaseField.creation_counter += 1

    def __get__(self, instance, owner):
-        """Descriptor for retrieving a value from a field in a document."""
+        """Descriptor for retrieving a value from a field in a document.
+        """
        if instance is None:
            # Document class being used rather than a document object
            return self
@ -130,9 +121,11 @@ class BaseField:
        return instance._data.get(self.name)

    def __set__(self, instance, value):
-        """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.
+        """Descriptor for assigning a value to a field in a document.
+        """
+
+        # 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
@ -143,29 +136,24 @@ class BaseField:

        if instance._initialised:
            try:
-                value_has_changed = (
-                    self.name not in instance._data
-                    or instance._data[self.name] != value
-                )
-                if value_has_changed:
+                if (self.name not in instance._data or
+                        instance._data[self.name] != value):
                    instance._mark_as_changed(self.name)
            except Exception:
-                # Some values can't be compared and throw an error when we
-                # attempt to do so (e.g. tz-naive and tz-aware datetimes).
-                # Mark the field as changed in such cases.
+                # Values cant be compared eg: naive and tz datetimes
+                # So mark it as changed
                instance._mark_as_changed(self.name)

-        EmbeddedDocument = _import_class("EmbeddedDocument")
+        EmbeddedDocument = _import_class('EmbeddedDocument')
        if isinstance(value, EmbeddedDocument):
            value._instance = weakref.proxy(instance)
        elif isinstance(value, (list, tuple)):
            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):
+    def error(self, message='', errors=None, field_name=None):
        """Raise a ValidationError."""
        field_name = field_name if field_name else self.name
        raise ValidationError(message, errors=errors, field_name=field_name)
@ -182,11 +170,11 @@ class BaseField:
        """Helper method to call to_mongo with proper inputs."""
        f_inputs = self.to_mongo.__code__.co_varnames
        ex_vars = {}
-        if "fields" in f_inputs:
-            ex_vars["fields"] = fields
+        if 'fields' in f_inputs:
+            ex_vars['fields'] = fields

-        if "use_db_field" in f_inputs:
-            ex_vars["use_db_field"] = use_db_field
+        if 'use_db_field' in f_inputs:
+            ex_vars['use_db_field'] = use_db_field

        return self.to_mongo(value, **ex_vars)

@ -201,8 +189,8 @@ class BaseField:
        pass

    def _validate_choices(self, value):
-        Document = _import_class("Document")
-        EmbeddedDocument = _import_class("EmbeddedDocument")
+        Document = _import_class('Document')
+        EmbeddedDocument = _import_class('EmbeddedDocument')

        choice_list = self.choices
        if isinstance(next(iter(choice_list)), (list, tuple)):
@ -212,12 +200,14 @@ class BaseField:
        # Choices which are other types of Documents
        if isinstance(value, (Document, EmbeddedDocument)):
            if not any(isinstance(value, c) for c in choice_list):
-                self.error("Value must be an instance of %s" % (choice_list))
+                self.error(
+                    'Value must be an instance of %s' % (
+                        six.text_type(choice_list)
+                    )
+                )
        # Choices which are types other than Documents
-        else:
-            values = value if isinstance(value, (list, tuple)) else [value]
-            if len(set(values) - set(choice_list)):
-                self.error("Value must be one of %s" % str(choice_list))
+        elif value not in choice_list:
+            self.error('Value must be one of %s' % six.text_type(choice_list))

    def _validate(self, value, **kwargs):
        # Check the Choices Constraint
@ -227,23 +217,11 @@ class BaseField:
        # check validation argument
        if self.validation is not None:
            if callable(self.validation):
-                try:
-                    # breaking change of 0.18
-                    # 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))
+                if not self.validation(value):
+                    self.error('Value does not match custom validation method')
            else:
-                raise ValueError(
-                    'validation argument for `"%s"` must be a ' "callable." % self.name
-                )
+                raise ValueError('validation argument for "%s" must be a '
+                                 'callable.' % self.name)

        self.validate(value, **kwargs)

@ -265,22 +243,11 @@ class ComplexBaseField(BaseField):
    Allows for nesting of embedded documents inside complex types.
    Handles the lazy dereferencing of a queryset by lazily dereferencing all
    items in a list / dict rather than one at a time.
+
+    .. versionadded:: 0.5
    """

-    def __init__(self, field=None, **kwargs):
-        self.field = field
-        super().__init__(**kwargs)
-
-    @staticmethod
-    def _lazy_load_refs(instance, name, ref_values, *, max_depth):
-        _dereference = _import_class("DeReference")()
-        documents = _dereference(
-            ref_values,
-            max_depth=max_depth,
-            instance=instance,
-            name=name,
-        )
-        return documents
+    field = None

    def __get__(self, instance, owner):
        """Descriptor to automatically dereference references."""
@ -288,37 +255,28 @@ class ComplexBaseField(BaseField):
            # Document class being used rather than a document object
            return self

-        ReferenceField = _import_class("ReferenceField")
-        GenericReferenceField = _import_class("GenericReferenceField")
-        EmbeddedDocumentListField = _import_class("EmbeddedDocumentListField")
+        ReferenceField = _import_class('ReferenceField')
+        GenericReferenceField = _import_class('GenericReferenceField')
+        EmbeddedDocumentListField = _import_class('EmbeddedDocumentListField')
+        dereference = (self._auto_dereference and
+                       (self.field is None or isinstance(self.field,
+                                                         (GenericReferenceField, ReferenceField))))

-        auto_dereference = instance._fields[self.name]._auto_dereference
+        _dereference = _import_class('DeReference')()

-        dereference = auto_dereference and (
-            self.field is None
-            or isinstance(self.field, (GenericReferenceField, ReferenceField))
-        )
-
-        if (
-            instance._initialised
-            and dereference
-            and instance._data.get(self.name)
-            and not getattr(instance._data[self.name], "_dereferenced", False)
-        ):
-            ref_values = instance._data.get(self.name)
-            instance._data[self.name] = self._lazy_load_refs(
-                ref_values=ref_values, instance=instance, name=self.name, max_depth=1
+        self._auto_dereference = instance._fields[self.name]._auto_dereference
+        if instance._initialised and dereference and instance._data.get(self.name):
+            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().__get__(instance, owner)
+        value = super(ComplexBaseField, self).__get__(instance, owner)

        # Convert lists / values so we can watch for any changes on them
        if isinstance(value, (list, tuple)):
-            if issubclass(type(self), EmbeddedDocumentListField) and not isinstance(
-                value, EmbeddedDocumentList
-            ):
+            if (issubclass(type(self), EmbeddedDocumentListField) and
+                    not isinstance(value, EmbeddedDocumentList)):
                value = EmbeddedDocumentList(value, instance, self.name)
            elif not isinstance(value, BaseList):
                value = BaseList(value, instance, self.name)
@ -327,14 +285,11 @@ class ComplexBaseField(BaseField):
            value = BaseDict(value, instance, self.name)
            instance._data[self.name] = value

-        if (
-            auto_dereference
-            and instance._initialised
-            and isinstance(value, (BaseList, BaseDict))
-            and not value._dereferenced
-        ):
-            value = self._lazy_load_refs(
-                ref_values=value, instance=instance, name=self.name, max_depth=1
+        if (self._auto_dereference and instance._initialised and
+                isinstance(value, (BaseList, BaseDict)) and
+                not value._dereferenced):
+            value = _dereference(
+                value, max_depth=1, instance=instance, name=self.name
            )
            value._dereferenced = True
            instance._data[self.name] = value
@ -343,75 +298,66 @@ class ComplexBaseField(BaseField):

    def to_python(self, value):
        """Convert a MongoDB-compatible type to a Python type."""
-        if isinstance(value, str):
+        if isinstance(value, six.string_types):
            return value

-        if hasattr(value, "to_python"):
+        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"):
+        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

        if self.field:
            self.field._auto_dereference = self._auto_dereference
-            value_dict = {
-                key: self.field.to_python(item) for key, item in value.items()
-            }
+            value_dict = {key: self.field.to_python(item)
+                          for key, item in value.items()}
        else:
-            Document = _import_class("Document")
+            Document = _import_class('Document')
            value_dict = {}
            for k, v in value.items():
                if isinstance(v, Document):
                    # We need the id from the saved object to create the DBRef
                    if v.pk is None:
-                        self.error(
-                            "You can only reference documents once they"
-                            " have been saved to the database"
-                        )
+                        self.error('You can only reference documents once they'
+                                   ' have been saved to the database')
                    collection = v._get_collection_name()
                    value_dict[k] = DBRef(collection, v.pk)
-                elif hasattr(v, "to_python"):
+                elif hasattr(v, 'to_python'):
                    value_dict[k] = v.to_python()
                else:
                    value_dict[k] = self.to_python(v)

        if is_list:  # Convert back to a list
-            return [
-                v for _, v in sorted(value_dict.items(), key=operator.itemgetter(0))
-            ]
+            return [v for _, v in sorted(value_dict.items(),
+                                         key=operator.itemgetter(0))]
        return value_dict

    def to_mongo(self, value, use_db_field=True, fields=None):
        """Convert a Python type to a MongoDB-compatible type."""
-        Document = _import_class("Document")
-        EmbeddedDocument = _import_class("EmbeddedDocument")
-        GenericReferenceField = _import_class("GenericReferenceField")
+        Document = _import_class('Document')
+        EmbeddedDocument = _import_class('EmbeddedDocument')
+        GenericReferenceField = _import_class('GenericReferenceField')

-        if isinstance(value, str):
+        if isinstance(value, six.string_types):
            return value

-        if hasattr(value, "to_mongo"):
+        if hasattr(value, 'to_mongo'):
            if isinstance(value, Document):
                return GenericReferenceField().to_mongo(value)
            cls = value.__class__
            val = value.to_mongo(use_db_field, fields)
            # If it's a document that is not inherited add _cls
            if isinstance(value, EmbeddedDocument):
-                val["_cls"] = cls.__name__
+                val['_cls'] = cls.__name__
            return val

        is_list = False
-        if not hasattr(value, "items"):
+        if not hasattr(value, 'items'):
            try:
                is_list = True
                value = {k: v for k, v in enumerate(value)}
@ -421,51 +367,48 @@ class ComplexBaseField(BaseField):
        if self.field:
            value_dict = {
                key: self.field._to_mongo_safe_call(item, use_db_field, fields)
-                for key, item in value.items()
+                for key, item in value.iteritems()
            }
        else:
            value_dict = {}
-            for k, v in value.items():
+            for k, v in value.iteritems():
                if isinstance(v, Document):
                    # We need the id from the saved object to create the DBRef
                    if v.pk is None:
-                        self.error(
-                            "You can only reference documents once they"
-                            " have been saved to the database"
-                        )
+                        self.error('You can only reference documents once they'
+                                   ' have been saved to the database')

                    # If its a document that is not inheritable it won't have
                    # any _cls data so make it a generic reference allows
                    # us to dereference
-                    meta = getattr(v, "_meta", {})
-                    allow_inheritance = meta.get("allow_inheritance")
+                    meta = getattr(v, '_meta', {})
+                    allow_inheritance = meta.get('allow_inheritance')
                    if not allow_inheritance and not self.field:
                        value_dict[k] = GenericReferenceField().to_mongo(v)
                    else:
                        collection = v._get_collection_name()
                        value_dict[k] = DBRef(collection, v.pk)
-                elif hasattr(v, "to_mongo"):
+                elif hasattr(v, 'to_mongo'):
                    cls = v.__class__
                    val = v.to_mongo(use_db_field, fields)
                    # If it's a document that is not inherited add _cls
                    if isinstance(v, (Document, EmbeddedDocument)):
-                        val["_cls"] = cls.__name__
+                        val['_cls'] = cls.__name__
                    value_dict[k] = val
                else:
                    value_dict[k] = self.to_mongo(v, use_db_field, fields)

        if is_list:  # Convert back to a list
-            return [
-                v for _, v in sorted(value_dict.items(), key=operator.itemgetter(0))
-            ]
+            return [v for _, v in sorted(value_dict.items(),
+                                         key=operator.itemgetter(0))]
        return value_dict

    def validate(self, value):
        """If field is provided ensure the value is valid."""
        errors = {}
        if self.field:
-            if hasattr(value, "items"):
-                sequence = value.items()
+            if hasattr(value, 'iteritems') or hasattr(value, 'items'):
+                sequence = value.iteritems()
            else:
                sequence = enumerate(value)
            for k, v in sequence:
@ -478,10 +421,11 @@ class ComplexBaseField(BaseField):

            if errors:
                field_class = self.field.__class__.__name__
-                self.error(f"Invalid {field_class} item ({value})", errors=errors)
+                self.error('Invalid %s item (%s)' % (field_class, value),
+                           errors=errors)
        # Don't allow empty values if required
        if self.required and not value:
-            self.error("Field is required and cannot be empty")
+            self.error('Field is required and cannot be empty')

    def prepare_query_value(self, op, value):
        return self.to_mongo(value)
@ -511,9 +455,10 @@ class ObjectIdField(BaseField):
    def to_mongo(self, value):
        if not isinstance(value, ObjectId):
            try:
-                return ObjectId(str(value))
+                return ObjectId(six.text_type(value))
            except Exception as e:
-                self.error(str(e))
+                # e.message attribute has been deprecated since Python 2.6
+                self.error(six.text_type(e))
        return value

    def prepare_query_value(self, op, value):
@ -521,82 +466,84 @@ class ObjectIdField(BaseField):

    def validate(self, value):
        try:
-            ObjectId(str(value))
+            ObjectId(six.text_type(value))
        except Exception:
-            self.error("Invalid ObjectID")
+            self.error('Invalid Object ID')


 class GeoJsonBaseField(BaseField):
-    """A geo json field storing a geojson style object."""
+    """A geo json field storing a geojson style object.
+
+    .. versionadded:: 0.8
+    """

    _geo_index = pymongo.GEOSPHERE
-    _type = "GeoBase"
+    _type = 'GeoBase'

    def __init__(self, auto_index=True, *args, **kwargs):
        """
        :param bool auto_index: Automatically create a '2dsphere' index.\
            Defaults to `True`.
        """
-        self._name = "%sField" % self._type
+        self._name = '%sField' % self._type
        if not auto_index:
            self._geo_index = False
-        super().__init__(*args, **kwargs)
+        super(GeoJsonBaseField, self).__init__(*args, **kwargs)

    def validate(self, value):
        """Validate the GeoJson object based on its type."""
        if isinstance(value, dict):
-            if set(value.keys()) == {"type", "coordinates"}:
-                if value["type"] != self._type:
-                    self.error(f'{self._name} type must be "{self._type}"')
-                return self.validate(value["coordinates"])
+            if set(value.keys()) == set(['type', 'coordinates']):
+                if value['type'] != self._type:
+                    self.error('%s type must be "%s"' %
+                               (self._name, self._type))
+                return self.validate(value['coordinates'])
            else:
-                self.error(
-                    "%s can only accept a valid GeoJson dictionary"
-                    " or lists of (x, y)" % self._name
-                )
+                self.error('%s can only accept a valid GeoJson dictionary'
+                           ' or lists of (x, y)' % self._name)
                return
        elif not isinstance(value, (list, tuple)):
-            self.error("%s can only accept lists of [x, y]" % self._name)
+            self.error('%s can only accept lists of [x, y]' % self._name)
            return

-        validate = getattr(self, "_validate_%s" % self._type.lower())
+        validate = getattr(self, '_validate_%s' % self._type.lower())
        error = validate(value)
        if error:
            self.error(error)

    def _validate_polygon(self, value, top_level=True):
        if not isinstance(value, (list, tuple)):
-            return "Polygons must contain list of linestrings"
+            return 'Polygons must contain list of linestrings'

        # Quick and dirty validator
        try:
            value[0][0][0]
        except (TypeError, IndexError):
-            return "Invalid Polygon must contain at least one valid linestring"
+            return 'Invalid Polygon must contain at least one valid linestring'

        errors = []
        for val in value:
            error = self._validate_linestring(val, False)
            if not error and val[0] != val[-1]:
-                error = "LineStrings must start and end at the same point"
+                error = 'LineStrings must start and end at the same point'
            if error and error not in errors:
                errors.append(error)
        if errors:
            if top_level:
-                return "Invalid Polygon:\n%s" % ", ".join(errors)
+                return 'Invalid Polygon:\n%s' % ', '.join(errors)
            else:
-                return "%s" % ", ".join(errors)
+                return '%s' % ', '.join(errors)

    def _validate_linestring(self, value, top_level=True):
        """Validate a linestring."""
        if not isinstance(value, (list, tuple)):
-            return "LineStrings must contain list of coordinate pairs"
+            return 'LineStrings must contain list of coordinate pairs'

        # Quick and dirty validator
        try:
            value[0][0]
        except (TypeError, IndexError):
-            return "Invalid LineString must contain at least one valid point"
+            return 'Invalid LineString must contain at least one valid point'

        errors = []
        for val in value:
@ -605,30 +552,29 @@ class GeoJsonBaseField(BaseField):
                errors.append(error)
        if errors:
            if top_level:
-                return "Invalid LineString:\n%s" % ", ".join(errors)
+                return 'Invalid LineString:\n%s' % ', '.join(errors)
            else:
-                return "%s" % ", ".join(errors)
+                return '%s' % ', '.join(errors)

    def _validate_point(self, value):
        """Validate each set of coords"""
        if not isinstance(value, (list, tuple)):
-            return "Points must be a list of coordinate pairs"
+            return 'Points must be a list of coordinate pairs'
        elif not len(value) == 2:
-            return "Value (%s) must be a two-dimensional point" % repr(value)
-        elif not isinstance(value[0], (float, int)) or not isinstance(
-            value[1], (float, int)
-        ):
-            return "Both values (%s) in point must be float or int" % repr(value)
+            return 'Value (%s) must be a two-dimensional point' % repr(value)
+        elif (not isinstance(value[0], (float, int)) or
+              not isinstance(value[1], (float, int))):
+            return 'Both values (%s) in point must be float or int' % repr(value)

    def _validate_multipoint(self, value):
        if not isinstance(value, (list, tuple)):
-            return "MultiPoint must be a list of Point"
+            return 'MultiPoint must be a list of Point'

        # Quick and dirty validator
        try:
            value[0][0]
        except (TypeError, IndexError):
-            return "Invalid MultiPoint must contain at least one valid point"
+            return 'Invalid MultiPoint must contain at least one valid point'

        errors = []
        for point in value:
@ -637,17 +583,17 @@ class GeoJsonBaseField(BaseField):
                errors.append(error)

        if errors:
-            return "%s" % ", ".join(errors)
+            return '%s' % ', '.join(errors)

    def _validate_multilinestring(self, value, top_level=True):
        if not isinstance(value, (list, tuple)):
-            return "MultiLineString must be a list of LineString"
+            return 'MultiLineString must be a list of LineString'

        # Quick and dirty validator
        try:
            value[0][0][0]
        except (TypeError, IndexError):
-            return "Invalid MultiLineString must contain at least one valid linestring"
+            return 'Invalid MultiLineString must contain at least one valid linestring'

        errors = []
        for linestring in value:
@ -657,19 +603,19 @@ class GeoJsonBaseField(BaseField):

        if errors:
            if top_level:
-                return "Invalid MultiLineString:\n%s" % ", ".join(errors)
+                return 'Invalid MultiLineString:\n%s' % ', '.join(errors)
            else:
-                return "%s" % ", ".join(errors)
+                return '%s' % ', '.join(errors)

    def _validate_multipolygon(self, value):
        if not isinstance(value, (list, tuple)):
-            return "MultiPolygon must be a list of Polygon"
+            return 'MultiPolygon must be a list of Polygon'

        # Quick and dirty validator
        try:
            value[0][0][0][0]
        except (TypeError, IndexError):
-            return "Invalid MultiPolygon must contain at least one valid Polygon"
+            return 'Invalid MultiPolygon must contain at least one valid Polygon'

        errors = []
        for polygon in value:
@ -678,9 +624,9 @@ class GeoJsonBaseField(BaseField):
                errors.append(error)

        if errors:
-            return "Invalid MultiPolygon:\n%s" % ", ".join(errors)
+            return 'Invalid MultiPolygon:\n%s' % ', '.join(errors)

    def to_mongo(self, value):
        if isinstance(value, dict):
            return value
-        return SON([("type", self._type), ("coordinates", value)])
+        return SON([('type', self._type), ('coordinates', value)])
--- a/mongoengine/base/metaclasses.py
+++ b/mongoengine/base/metaclasses.py
@ -1,75 +1,68 @@
-import itertools
 import warnings

+import six
+
 from mongoengine.base.common import _document_registry
-from mongoengine.base.fields import (
-    BaseField,
-    ComplexBaseField,
-    ObjectIdField,
-)
+from mongoengine.base.fields import BaseField, ComplexBaseField, ObjectIdField
 from mongoengine.common import _import_class
 from mongoengine.errors import InvalidDocumentError
-from mongoengine.queryset import (
-    DO_NOTHING,
-    DoesNotExist,
-    MultipleObjectsReturned,
-    QuerySetManager,
-)
+from mongoengine.queryset import (DO_NOTHING, DoesNotExist,
+                                  MultipleObjectsReturned,
+                                  QuerySetManager)

-__all__ = ("DocumentMetaclass", "TopLevelDocumentMetaclass")
+
+__all__ = ('DocumentMetaclass', 'TopLevelDocumentMetaclass')


 class DocumentMetaclass(type):
    """Metaclass for all documents."""

    # TODO lower complexity of this method
-    def __new__(mcs, name, bases, attrs):
-        flattened_bases = mcs._get_bases(bases)
-        super_new = super().__new__
+    def __new__(cls, name, bases, attrs):
+        flattened_bases = cls._get_bases(bases)
+        super_new = super(DocumentMetaclass, cls).__new__

        # If a base class just call super
-        metaclass = attrs.get("my_metaclass")
+        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"] = []
+        attrs['_is_document'] = attrs.get('_is_document', False)
+        attrs['_cached_reference_fields'] = []

        # EmbeddedDocuments could have meta data for inheritance
-        if "meta" in attrs:
-            attrs["_meta"] = attrs.pop("meta")
+        if 'meta' in attrs:
+            attrs['_meta'] = attrs.pop('meta')

        # EmbeddedDocuments should inherit meta data
-        if "_meta" not in attrs:
+        if '_meta' not in attrs:
            meta = MetaDict()
            for base in flattened_bases[::-1]:
                # Add any mixin metadata from plain objects
-                if hasattr(base, "meta"):
+                if hasattr(base, 'meta'):
                    meta.merge(base.meta)
-                elif hasattr(base, "_meta"):
+                elif hasattr(base, '_meta'):
                    meta.merge(base._meta)
-            attrs["_meta"] = meta
-            attrs["_meta"][
-                "abstract"
-            ] = False  # 789: EmbeddedDocument shouldn't inherit abstract
+            attrs['_meta'] = meta
+            attrs['_meta']['abstract'] = False  # 789: EmbeddedDocument shouldn't inherit abstract

        # If allow_inheritance is True, add a "_cls" string field to the attrs
-        if attrs["_meta"].get("allow_inheritance"):
-            StringField = _import_class("StringField")
-            attrs["_cls"] = StringField()
+        if attrs['_meta'].get('allow_inheritance'):
+            StringField = _import_class('StringField')
+            attrs['_cls'] = StringField()

        # Handle document Fields

        # Merge all fields from subclasses
        doc_fields = {}
        for base in flattened_bases[::-1]:
-            if hasattr(base, "_fields"):
+            if hasattr(base, '_fields'):
                doc_fields.update(base._fields)

            # Standard object mixin - merge in any Fields
-            if not hasattr(base, "_meta"):
+            if not hasattr(base, '_meta'):
                base_fields = {}
-                for attr_name, attr_value in base.__dict__.items():
+                for attr_name, attr_value in base.__dict__.iteritems():
                    if not isinstance(attr_value, BaseField):
                        continue
                    attr_value.name = attr_name
@ -81,7 +74,7 @@ class DocumentMetaclass(type):

        # Discover any document fields
        field_names = {}
-        for attr_name, attr_value in attrs.items():
+        for attr_name, attr_value in attrs.iteritems():
            if not isinstance(attr_value, BaseField):
                continue
            attr_value.name = attr_name
@ -90,29 +83,27 @@ class DocumentMetaclass(type):
            doc_fields[attr_name] = attr_value

            # Count names to ensure no db_field redefinitions
-            field_names[attr_value.db_field] = (
-                field_names.get(attr_value.db_field, 0) + 1
-            )
+            field_names[attr_value.db_field] = field_names.get(
+                attr_value.db_field, 0) + 1

        # Ensure no duplicate db_fields
        duplicate_db_fields = [k for k, v in field_names.items() if v > 1]
        if duplicate_db_fields:
-            msg = "Multiple db_fields defined for: %s " % ", ".join(duplicate_db_fields)
+            msg = ('Multiple db_fields defined for: %s ' %
+                   ', '.join(duplicate_db_fields))
            raise InvalidDocumentError(msg)

        # Set _fields and db_field maps
-        attrs["_fields"] = doc_fields
-        attrs["_db_field_map"] = {
-            k: getattr(v, "db_field", k) for k, v in doc_fields.items()
-        }
-        attrs["_reverse_db_field_map"] = {
-            v: k for k, v in attrs["_db_field_map"].items()
+        attrs['_fields'] = doc_fields
+        attrs['_db_field_map'] = {k: getattr(v, 'db_field', k)
+                                  for k, v in doc_fields.items()}
+        attrs['_reverse_db_field_map'] = {
+            v: k for k, v in attrs['_db_field_map'].items()
        }

-        attrs["_fields_ordered"] = tuple(
-            i[1]
-            for i in sorted((v.creation_counter, v.name) for v in doc_fields.values())
-        )
+        attrs['_fields_ordered'] = tuple(i[1] for i in sorted(
+                                         (v.creation_counter, v.name)
+                                         for v in doc_fields.itervalues()))

        #
        # Set document hierarchy
@ -120,37 +111,34 @@ class DocumentMetaclass(type):
        superclasses = ()
        class_name = [name]
        for base in flattened_bases:
-            if not getattr(base, "_is_base_cls", True) and not getattr(
-                base, "_meta", {}
-            ).get("abstract", True):
+            if (not getattr(base, '_is_base_cls', True) and
+                    not getattr(base, '_meta', {}).get('abstract', True)):
                # Collate hierarchy for _cls and _subclasses
                class_name.append(base.__name__)

-            if hasattr(base, "_meta"):
+            if hasattr(base, '_meta'):
                # Warn if allow_inheritance isn't set and prevent
                # inheritance of classes where inheritance is set to False
-                allow_inheritance = base._meta.get("allow_inheritance")
-                if not allow_inheritance and not base._meta.get("abstract"):
-                    raise ValueError(
-                        "Document %s may not be subclassed. "
-                        'To enable inheritance, use the "allow_inheritance" meta attribute.'
-                        % base.__name__
-                    )
+                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' %
+                                     base.__name__)

        # Get superclasses from last base superclass
-        document_bases = [b for b in flattened_bases if hasattr(b, "_class_name")]
+        document_bases = [b for b in flattened_bases
+                          if hasattr(b, '_class_name')]
        if document_bases:
            superclasses = document_bases[0]._superclasses
-            superclasses += (document_bases[0]._class_name,)
+            superclasses += (document_bases[0]._class_name, )

-        _cls = ".".join(reversed(class_name))
-        attrs["_class_name"] = _cls
-        attrs["_superclasses"] = superclasses
-        attrs["_subclasses"] = (_cls,)
-        attrs["_types"] = attrs["_subclasses"]  # TODO depreciate _types
+        _cls = '.'.join(reversed(class_name))
+        attrs['_class_name'] = _cls
+        attrs['_superclasses'] = superclasses
+        attrs['_subclasses'] = (_cls, )
+        attrs['_types'] = attrs['_subclasses']  # TODO depreciate _types

        # Create the new_class
-        new_class = super_new(mcs, name, bases, attrs)
+        new_class = super_new(cls, name, bases, attrs)

        # Set _subclasses
        for base in document_bases:
@ -158,12 +146,8 @@ class DocumentMetaclass(type):
                base._subclasses += (_cls,)
            base._types = base._subclasses  # TODO depreciate _types

-        (
-            Document,
-            EmbeddedDocument,
-            DictField,
-            CachedReferenceField,
-        ) = mcs._import_classes()
+        (Document, EmbeddedDocument, DictField,
+         CachedReferenceField) = cls._import_classes()

        if issubclass(new_class, Document):
            new_class._collection = None
@ -171,77 +155,97 @@ class DocumentMetaclass(type):
        # Add class to the _document_registry
        _document_registry[new_class._class_name] = new_class

+        # In Python 2, User-defined methods objects have special read-only
+        # attributes 'im_func' and 'im_self' which contain the function obj
+        # and class instance object respectively.  With Python 3 these special
+        # attributes have been replaced by __func__ and __self__.  The Blinker
+        # module continues to use im_func and im_self, so the code below
+        # copies __func__ into im_func and __self__ into im_self for
+        # classmethod objects in Document derived classes.
+        if six.PY3:
+            for val in new_class.__dict__.values():
+                if isinstance(val, classmethod):
+                    f = val.__get__(new_class)
+                    if hasattr(f, '__func__') and not hasattr(f, 'im_func'):
+                        f.__dict__.update({'im_func': getattr(f, '__func__')})
+                    if hasattr(f, '__self__') and not hasattr(f, 'im_self'):
+                        f.__dict__.update({'im_self': getattr(f, '__self__')})
+
        # Handle delete rules
-        for field in new_class._fields.values():
+        for field in new_class._fields.itervalues():
            f = field
            if f.owner_document is None:
                f.owner_document = new_class
-            delete_rule = getattr(f, "reverse_delete_rule", DO_NOTHING)
+            delete_rule = getattr(f, 'reverse_delete_rule', DO_NOTHING)
            if isinstance(f, CachedReferenceField):

                if issubclass(new_class, EmbeddedDocument):
+                    raise InvalidDocumentError('CachedReferenceFields is not '
+                                               'allowed in EmbeddedDocuments')
+                if not f.document_type:
                    raise InvalidDocumentError(
-                        "CachedReferenceFields is not allowed in EmbeddedDocuments"
-                    )
+                        'Document is not available to sync')

                if f.auto_sync:
                    f.start_listener()

                f.document_type._cached_reference_fields.append(f)

-            if isinstance(f, ComplexBaseField) and hasattr(f, "field"):
-                delete_rule = getattr(f.field, "reverse_delete_rule", DO_NOTHING)
+            if isinstance(f, ComplexBaseField) and hasattr(f, 'field'):
+                delete_rule = getattr(f.field,
+                                      'reverse_delete_rule',
+                                      DO_NOTHING)
                if isinstance(f, DictField) and delete_rule != DO_NOTHING:
-                    msg = (
-                        "Reverse delete rules are not supported "
-                        "for %s (field: %s)" % (field.__class__.__name__, field.name)
-                    )
+                    msg = ('Reverse delete rules are not supported '
+                           'for %s (field: %s)' %
+                           (field.__class__.__name__, field.name))
                    raise InvalidDocumentError(msg)

                f = field.field

            if delete_rule != DO_NOTHING:
                if issubclass(new_class, EmbeddedDocument):
-                    msg = (
-                        "Reverse delete rules are not supported for "
-                        "EmbeddedDocuments (field: %s)" % field.name
-                    )
+                    msg = ('Reverse delete rules are not supported for '
+                           'EmbeddedDocuments (field: %s)' % field.name)
                    raise InvalidDocumentError(msg)
-                f.document_type.register_delete_rule(new_class, field.name, delete_rule)
+                f.document_type.register_delete_rule(new_class,
+                                                     field.name, delete_rule)

-            if (
-                field.name
-                and hasattr(Document, field.name)
-                and EmbeddedDocument not in new_class.mro()
-            ):
-                msg = "%s is a document method and not a valid field name" % field.name
+            if (field.name and hasattr(Document, field.name) and
+                    EmbeddedDocument not in new_class.mro()):
+                msg = ('%s is a document method and not a valid '
+                       'field name' % field.name)
                raise InvalidDocumentError(msg)

        return new_class

+    def add_to_class(self, name, value):
+        setattr(self, name, value)
+
    @classmethod
-    def _get_bases(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
-            yield from mcs.__get_bases(base.__bases__)
+            for child_base in cls.__get_bases(base.__bases__):
+                yield child_base

    @classmethod
-    def _import_classes(mcs):
-        Document = _import_class("Document")
-        EmbeddedDocument = _import_class("EmbeddedDocument")
-        DictField = _import_class("DictField")
-        CachedReferenceField = _import_class("CachedReferenceField")
+    def _import_classes(cls):
+        Document = _import_class('Document')
+        EmbeddedDocument = _import_class('EmbeddedDocument')
+        DictField = _import_class('DictField')
+        CachedReferenceField = _import_class('CachedReferenceField')
        return Document, EmbeddedDocument, DictField, CachedReferenceField


@ -250,213 +254,193 @@ class TopLevelDocumentMetaclass(DocumentMetaclass):
    collection in the database.
    """

-    def __new__(mcs, name, bases, attrs):
-        flattened_bases = mcs._get_bases(bases)
-        super_new = super().__new__
+    def __new__(cls, name, bases, attrs):
+        flattened_bases = cls._get_bases(bases)
+        super_new = super(TopLevelDocumentMetaclass, cls).__new__

        # Set default _meta data if base class, otherwise get user defined meta
-        if attrs.get("my_metaclass") == TopLevelDocumentMetaclass:
+        if attrs.get('my_metaclass') == TopLevelDocumentMetaclass:
            # defaults
-            attrs["_meta"] = {
-                "abstract": True,
-                "max_documents": None,
-                "max_size": None,
-                "ordering": [],  # default ordering applied at runtime
-                "indexes": [],  # indexes to be ensured at runtime
-                "id_field": None,
-                "index_background": False,
-                "index_opts": None,
-                "delete_rules": None,
+            attrs['_meta'] = {
+                'abstract': True,
+                'max_documents': None,
+                'max_size': None,
+                'ordering': [],  # default ordering applied at runtime
+                'indexes': [],  # indexes to be ensured at runtime
+                'id_field': None,
+                'index_background': False,
+                'index_drop_dups': False,
+                'index_opts': None,
+                'delete_rules': None,
+
                # allow_inheritance can be True, False, and None. True means
                # "allow inheritance", False means "don't allow inheritance",
                # None means "do whatever your parent does, or don't allow
                # inheritance if you're a top-level class".
-                "allow_inheritance": None,
+                'allow_inheritance': None,
            }
-            attrs["_is_base_cls"] = True
-            attrs["_meta"].update(attrs.get("meta", {}))
+            attrs['_is_base_cls'] = True
+            attrs['_meta'].update(attrs.get('meta', {}))
        else:
-            attrs["_meta"] = attrs.get("meta", {})
+            attrs['_meta'] = attrs.get('meta', {})
            # Explicitly set abstract to false unless set
-            attrs["_meta"]["abstract"] = attrs["_meta"].get("abstract", False)
-            attrs["_is_base_cls"] = False
+            attrs['_meta']['abstract'] = attrs['_meta'].get('abstract', False)
+            attrs['_is_base_cls'] = False

        # Set flag marking as document class - as opposed to an object mixin
-        attrs["_is_document"] = True
+        attrs['_is_document'] = True

        # Ensure queryset_class is inherited
-        if "objects" in attrs:
-            manager = attrs["objects"]
-            if hasattr(manager, "queryset_class"):
-                attrs["_meta"]["queryset_class"] = manager.queryset_class
+        if 'objects' in attrs:
+            manager = attrs['objects']
+            if hasattr(manager, 'queryset_class'):
+                attrs['_meta']['queryset_class'] = manager.queryset_class

        # Clean up top level meta
-        if "meta" in attrs:
-            del attrs["meta"]
+        if 'meta' in attrs:
+            del attrs['meta']

        # Find the parent document class
-        parent_doc_cls = [
-            b for b in flattened_bases if b.__class__ == TopLevelDocumentMetaclass
-        ]
+        parent_doc_cls = [b for b in flattened_bases
+                          if b.__class__ == TopLevelDocumentMetaclass]
        parent_doc_cls = None if not parent_doc_cls else parent_doc_cls[0]

        # Prevent classes setting collection different to their parents
        # If parent wasn't an abstract class
-        if (
-            parent_doc_cls
-            and "collection" in attrs.get("_meta", {})
-            and not parent_doc_cls._meta.get("abstract", True)
-        ):
-            msg = "Trying to set a collection on a subclass (%s)" % name
+        if (parent_doc_cls and 'collection' in attrs.get('_meta', {}) and
+                not parent_doc_cls._meta.get('abstract', True)):
+            msg = 'Trying to set a collection on a subclass (%s)' % name
            warnings.warn(msg, SyntaxWarning)
-            del attrs["_meta"]["collection"]
+            del attrs['_meta']['collection']

        # Ensure abstract documents have abstract bases
-        if attrs.get("_is_base_cls") or attrs["_meta"].get("abstract"):
-            if parent_doc_cls and not parent_doc_cls._meta.get("abstract", False):
-                msg = "Abstract document cannot have non-abstract base"
+        if attrs.get('_is_base_cls') or attrs['_meta'].get('abstract'):
+            if (parent_doc_cls and
+                    not parent_doc_cls._meta.get('abstract', False)):
+                msg = 'Abstract document cannot have non-abstract base'
                raise ValueError(msg)
-            return super_new(mcs, name, bases, attrs)
+            return super_new(cls, name, bases, attrs)

        # Merge base class metas.
        # Uses a special MetaDict that handles various merging rules
        meta = MetaDict()
        for base in flattened_bases[::-1]:
            # Add any mixin metadata from plain objects
-            if hasattr(base, "meta"):
+            if hasattr(base, 'meta'):
                meta.merge(base.meta)
-            elif hasattr(base, "_meta"):
+            elif hasattr(base, '_meta'):
                meta.merge(base._meta)

            # Set collection in the meta if its callable
-            if getattr(base, "_is_document", False) and not base._meta.get("abstract"):
-                collection = meta.get("collection", None)
+            if (getattr(base, '_is_document', False) and
+                    not base._meta.get('abstract')):
+                collection = meta.get('collection', None)
                if callable(collection):
-                    meta["collection"] = collection(base)
+                    meta['collection'] = collection(base)

-        meta.merge(attrs.get("_meta", {}))  # Top level meta
+        meta.merge(attrs.get('_meta', {}))  # Top level meta

        # Only simple classes (i.e. direct subclasses of Document) may set
        # allow_inheritance to False. If the base Document allows inheritance,
        # none of its subclasses can override allow_inheritance to False.
-        simple_class = all(
-            b._meta.get("abstract") for b in flattened_bases if hasattr(b, "_meta")
-        )
+        simple_class = all([b._meta.get('abstract')
+                            for b in flattened_bases if hasattr(b, '_meta')])
        if (
-            not simple_class
-            and meta["allow_inheritance"] is False
-            and not meta["abstract"]
+            not simple_class and
+            meta['allow_inheritance'] is False and
+            not meta['abstract']
        ):
-            raise ValueError(
-                "Only direct subclasses of Document may set "
-                '"allow_inheritance" to False'
-            )
+            raise ValueError('Only direct subclasses of Document may set '
+                             '"allow_inheritance" to False')

        # Set default collection name
-        if "collection" not in meta:
-            meta["collection"] = (
-                "".join("_%s" % c if c.isupper() else c for c in name)
-                .strip("_")
-                .lower()
-            )
-        attrs["_meta"] = meta
+        if 'collection' not in meta:
+            meta['collection'] = ''.join('_%s' % c if c.isupper() else c
+                                         for c in name).strip('_').lower()
+        attrs['_meta'] = meta

        # Call super and get the new class
-        new_class = super_new(mcs, name, bases, attrs)
+        new_class = super_new(cls, name, bases, attrs)

        meta = new_class._meta

        # Set index specifications
-        meta["index_specs"] = new_class._build_index_specs(meta["indexes"])
+        meta['index_specs'] = new_class._build_index_specs(meta['indexes'])

        # If collection is a callable - call it and set the value
-        collection = meta.get("collection")
+        collection = meta.get('collection')
        if callable(collection):
-            new_class._meta["collection"] = collection(new_class)
+            new_class._meta['collection'] = collection(new_class)

        # Provide a default queryset unless exists or one has been set
-        if "objects" not in dir(new_class):
+        if 'objects' not in dir(new_class):
            new_class.objects = QuerySetManager()

        # Validate the fields and set primary key if needed
-        for field_name, field in new_class._fields.items():
+        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")
+                current_pk = new_class._meta.get('id_field')
                if current_pk and current_pk != field_name:
-                    raise ValueError("Cannot override primary key field")
+                    raise ValueError('Cannot override primary key field')

                # Set primary key
                if not current_pk:
-                    new_class._meta["id_field"] = field_name
+                    new_class._meta['id_field'] = field_name
                    new_class.id = field

-        # If the document doesn't explicitly define a primary key field, create
-        # one. Make it an ObjectIdField and give it a non-clashing name ("id"
-        # by default, but can be different if that one's taken).
-        if not new_class._meta.get("id_field"):
-            id_name, id_db_name = mcs.get_auto_id_names(new_class)
-            new_class._meta["id_field"] = id_name
+        # Set primary key if not defined by the document
+        new_class._auto_id_field = getattr(parent_doc_cls,
+                                           '_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 = 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)
            new_class._fields[id_name].name = id_name
            new_class.id = new_class._fields[id_name]
            new_class._db_field_map[id_name] = id_db_name
            new_class._reverse_db_field_map[id_db_name] = id_name
+            # Prepend id field to _fields_ordered
+            new_class._fields_ordered = (id_name, ) + new_class._fields_ordered

-            # Prepend the ID field to _fields_ordered (so that it's *always*
-            # the first field).
-            new_class._fields_ordered = (id_name,) + new_class._fields_ordered
-
-        # Merge in exceptions with parent hierarchy.
+        # Merge in exceptions with parent hierarchy
        exceptions_to_merge = (DoesNotExist, MultipleObjectsReturned)
-        module = attrs.get("__module__")
+        module = attrs.get('__module__')
        for exc in exceptions_to_merge:
            name = exc.__name__
-            parents = tuple(
-                getattr(base, name) for base in flattened_bases if hasattr(base, name)
-            ) or (exc,)
-
-            # Create a new exception and set it as an attribute on the new
-            # class.
-            exception = type(name, parents, {"__module__": module})
+            parents = tuple(getattr(base, name) for base in flattened_bases
+                            if hasattr(base, name)) or (exc,)
+            # Create new exception and set to new_class
+            exception = type(name, parents, {'__module__': module})
            setattr(new_class, name, exception)

        return new_class

    @classmethod
-    def get_auto_id_names(mcs, new_class):
-        """Find a name for the automatic ID field for the given new class.
-
-        Return a two-element tuple where the first item is the field name (i.e.
-        the attribute name on the object) and the second element is the DB
-        field name (i.e. the name of the key stored in MongoDB).
-
-        Defaults to ('id', '_id'), or generates a non-clashing name in the form
-        of ('auto_id_X', '_auto_id_X') if the default name is already taken.
-        """
-        id_name, id_db_name = ("id", "_id")
-        existing_fields = {field_name for field_name in new_class._fields}
-        existing_db_fields = {v.db_field for v in new_class._fields.values()}
-        if id_name not in existing_fields and id_db_name not in existing_db_fields:
+    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()):
            return id_name, id_db_name
-
-        id_basename, id_db_basename, i = ("auto_id", "_auto_id", 0)
-        for i in itertools.count():
-            id_name = f"{id_basename}_{i}"
-            id_db_name = f"{id_db_basename}_{i}"
-            if id_name not in existing_fields and id_db_name not in existing_db_fields:
-                return id_name, id_db_name
+        id_basename, id_db_basename, i = 'auto_id', '_auto_id', 0
+        while id_name in new_class._fields or \
+                id_db_name in (v.db_field for v in new_class._fields.values()):
+            id_name = '{0}_{1}'.format(id_basename, i)
+            id_db_name = '{0}_{1}'.format(id_db_basename, i)
+            i += 1
+        return id_name, id_db_name


 class MetaDict(dict):
    """Custom dictionary for meta classes.
    Handles the merging of set indexes
    """
-
-    _merge_options = ("indexes",)
+    _merge_options = ('indexes',)

    def merge(self, new_options):
-        for k, v in new_options.items():
+        for k, v in new_options.iteritems():
            if k in self._merge_options:
                self[k] = self.get(k, []) + v
            else:
@ -465,5 +449,4 @@ class MetaDict(dict):

 class BasesTuple(tuple):
    """Special class to handle introspection of bases tuple in __new__"""
-
    pass
--- a/mongoengine/base/utils.py
+++ b/mongoengine/base/utils.py
@ -1,22 +0,0 @@
-import re
-
-
-class LazyRegexCompiler:
-    """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
@ -19,44 +19,38 @@ def _import_class(cls_name):
    if cls_name in _class_registry_cache:
        return _class_registry_cache.get(cls_name)

-    doc_classes = (
-        "Document",
-        "DynamicEmbeddedDocument",
-        "EmbeddedDocument",
-        "MapReduceDocument",
-    )
+    doc_classes = ('Document', 'DynamicEmbeddedDocument', 'EmbeddedDocument',
+                   'MapReduceDocument')

    # Field Classes
    if not _field_list_cache:
        from mongoengine.fields import __all__ as fields
-
        _field_list_cache.extend(fields)
        from mongoengine.base.fields import __all__ as fields
-
        _field_list_cache.extend(fields)

    field_classes = _field_list_cache

-    deref_classes = ("DeReference",)
+    queryset_classes = ('OperationError',)
+    deref_classes = ('DeReference',)

-    if cls_name == "BaseDocument":
+    if cls_name == 'BaseDocument':
        from mongoengine.base import document as module
-
-        import_classes = ["BaseDocument"]
+        import_classes = ['BaseDocument']
    elif cls_name in doc_classes:
        from mongoengine import document as module
-
        import_classes = doc_classes
    elif cls_name in field_classes:
        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
@ -1,68 +1,48 @@
 from pymongo import MongoClient, ReadPreference, uri_parser
-from pymongo.database import _check_name
+import six

-__all__ = [
-    "DEFAULT_CONNECTION_NAME",
-    "DEFAULT_DATABASE_NAME",
-    "ConnectionFailure",
-    "connect",
-    "disconnect",
-    "disconnect_all",
-    "get_connection",
-    "get_db",
-    "register_connection",
-]
+from mongoengine.python_support import IS_PYMONGO_3
+
+__all__ = ['MongoEngineConnectionError', 'connect', 'register_connection',
+           'DEFAULT_CONNECTION_NAME']


-DEFAULT_CONNECTION_NAME = "default"
-DEFAULT_DATABASE_NAME = "test"
-DEFAULT_HOST = "localhost"
-DEFAULT_PORT = 27017
+DEFAULT_CONNECTION_NAME = 'default'
+
+if IS_PYMONGO_3:
+    READ_PREFERENCE = ReadPreference.PRIMARY
+else:
+    from pymongo import MongoReplicaSetClient
+    READ_PREFERENCE = False
+
+
+class MongoEngineConnectionError(Exception):
+    """Error raised when the database connection can't be established or
+    when a connection with a requested alias can't be retrieved.
+    """
+    pass
+

 _connection_settings = {}
 _connections = {}
 _dbs = {}

-READ_PREFERENCE = ReadPreference.PRIMARY

+def register_connection(alias, name=None, host=None, port=None,
+                        read_preference=READ_PREFERENCE,
+                        username=None, password=None,
+                        authentication_source=None,
+                        authentication_mechanism=None,
+                        **kwargs):
+    """Add a connection.

-class ConnectionFailure(Exception):
-    """Error raised when the database connection can't be established or
-    when a connection with a requested alias can't be retrieved.
-    """
-
-    pass
-
-
-def _check_db_name(name):
-    """Check if a database name is valid.
-    This functionality is copied from pymongo Database class constructor.
-    """
-    if not isinstance(name, str):
-        raise TypeError("name must be an instance of %s" % str)
-    elif name != "$external":
-        _check_name(name)
-
-
-def _get_connection_settings(
-    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
-
-    :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
+        throughout MongoEngine
    :param name: the name of the specific database to use
-    :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 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
+       ** Added pymongo 2.1
    :param username: username to authenticate with
    :param password: password to authenticate with
    :param authentication_source: database to authenticate against
@ -70,176 +50,79 @@ def _get_connection_settings(
        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)
+        (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 = {
-        "name": name or db or DEFAULT_DATABASE_NAME,
-        "host": host or DEFAULT_HOST,
-        "port": port or DEFAULT_PORT,
-        "read_preference": read_preference,
-        "username": username,
-        "password": password,
-        "authentication_source": authentication_source,
-        "authentication_mechanism": authentication_mechanism,
+        'name': name or 'test',
+        'host': host or 'localhost',
+        'port': port or 27017,
+        'read_preference': read_preference,
+        'username': username,
+        'password': password,
+        'authentication_source': authentication_source,
+        'authentication_mechanism': authentication_mechanism
    }

-    _check_db_name(conn_settings["name"])
-    conn_host = conn_settings["host"]
+    conn_host = conn_settings['host']

    # Host can be a list or a string, so if string, force to a list.
-    if isinstance(conn_host, str):
+    if isinstance(conn_host, six.string_types):
        conn_host = [conn_host]

    resolved_hosts = []
    for entity in conn_host:

        # Handle Mongomock
-        if entity.startswith("mongomock://"):
-            conn_settings["is_mock"] = True
+        if entity.startswith('mongomock://'):
+            conn_settings['is_mock'] = True
            # `mongomock://` is not a valid url prefix and must be replaced by `mongodb://`
-            new_entity = entity.replace("mongomock://", "mongodb://", 1)
-            resolved_hosts.append(new_entity)
-
-            uri_dict = uri_parser.parse_uri(new_entity)
-
-            database = uri_dict.get("database")
-            if database:
-                conn_settings["name"] = database
+            resolved_hosts.append(entity.replace('mongomock://', 'mongodb://', 1))

        # Handle URI style connections, only updating connection params which
        # were explicitly specified in the URI.
-        elif "://" in entity:
+        elif '://' in entity:
            uri_dict = uri_parser.parse_uri(entity)
            resolved_hosts.append(entity)

-            database = uri_dict.get("database")
-            if database:
-                conn_settings["name"] = database
+            if uri_dict.get('database'):
+                conn_settings['name'] = uri_dict.get('database')

-            for param in ("read_preference", "username", "password"):
+            for param in ('read_preference', 'username', 'password'):
                if uri_dict.get(param):
                    conn_settings[param] = uri_dict[param]

-            uri_options = uri_dict["options"]
-            if "replicaset" in uri_options:
-                conn_settings["replicaSet"] = uri_options["replicaset"]
-            if "authsource" in uri_options:
-                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, str):
-                    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
+            uri_options = uri_dict['options']
+            if 'replicaset' in uri_options:
+                conn_settings['replicaSet'] = uri_options['replicaset']
+            if 'authsource' in uri_options:
+                conn_settings['authentication_source'] = uri_options['authsource']
+            if 'authmechanism' in uri_options:
+                conn_settings['authentication_mechanism'] = uri_options['authmechanism']
        else:
            resolved_hosts.append(entity)
-    conn_settings["host"] = resolved_hosts
+    conn_settings['host'] = resolved_hosts

    # Deprecated parameters that should not be passed on
-    kwargs.pop("slaves", None)
-    kwargs.pop("is_slave", None)
+    kwargs.pop('slaves', None)
+    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 db: the name of the database to use, for compatibility with connect
-    :param name: the name of the specific database to use
-    :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.
-    """
-    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 import Document
-    from mongoengine.base.common import _get_documents_by_db
-
    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."""
@ -254,93 +137,84 @@ def get_connection(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
        return _connections[alias]

    # Validate that the requested alias exists in the _connection_settings.
-    # Raise ConnectionFailure if it doesn't.
+    # Raise MongoEngineConnectionError if it doesn't.
    if alias not in _connection_settings:
        if alias == DEFAULT_CONNECTION_NAME:
-            msg = "You have not defined a default connection"
+            msg = 'You have not defined a default connection'
        else:
            msg = 'Connection with alias "%s" has not been defined' % alias
-        raise ConnectionFailure(msg)
+        raise MongoEngineConnectionError(msg)

    def _clean_settings(settings_dict):
-        irrelevant_fields_set = {
-            "name",
-            "username",
-            "password",
-            "authentication_source",
-            "authentication_mechanism",
-        }
+        irrelevant_fields = set([
+            'name', 'username', 'password', 'authentication_source',
+            'authentication_mechanism'
+        ])
        return {
-            k: v for k, v in settings_dict.items() if k not in irrelevant_fields_set
+            k: v for k, v in settings_dict.items()
+            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)
+    is_mock = conn_settings.pop('is_mock', False)
    if is_mock:
        try:
            import mongomock
        except ImportError:
-            raise RuntimeError("You need mongomock installed to mock MongoEngine.")
+            raise RuntimeError('You need mongomock installed to mock '
+                               'MongoEngine.')
        connection_class = mongomock.MongoClient
    else:
        connection_class = MongoClient

-    # Re-use existing connection if one is suitable.
-    existing_connection = _find_existing_connection(raw_conn_settings)
-    if existing_connection:
-        connection = existing_connection
-    else:
-        connection = _create_connection(
-            alias=alias, connection_class=connection_class, **conn_settings
-        )
-    _connections[alias] = connection
-    return _connections[alias]
+        # For replica set connections with PyMongo 2.x, use
+        # MongoReplicaSetClient.
+        # TODO remove this once we stop supporting PyMongo 2.x.
+        if 'replicaSet' in conn_settings and not IS_PYMONGO_3:
+            connection_class = MongoReplicaSetClient
+            conn_settings['hosts_or_uri'] = conn_settings.pop('host', None)

+            # hosts_or_uri has to be a string, so if 'host' was provided
+            # as a list, join its parts and separate them by ','
+            if isinstance(conn_settings['hosts_or_uri'], list):
+                conn_settings['hosts_or_uri'] = ','.join(
+                    conn_settings['hosts_or_uri'])

-def _create_connection(alias, connection_class, **connection_settings):
-    """
-    Create the new connection for this alias. Raise
-    ConnectionFailure if it can't be established.
-    """
-    try:
-        return connection_class(**connection_settings)
-    except Exception as e:
-        raise ConnectionFailure(f"Cannot connect to database {alias} :\n{e}")
+            # Discard port since it can't be used on MongoReplicaSetClient
+            conn_settings.pop('port', None)

-
-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 = (
+    # Iterate over all of the connection settings and if a connection with
+    # the same parameters is already established, use it instead of creating
+    # a new one.
+    existing_connection = None
+    connection_settings_iterator = (
        (db_alias, settings.copy())
        for db_alias, settings in _connection_settings.items()
    )
+    for db_alias, connection_settings in connection_settings_iterator:
+        connection_settings = _clean_settings(connection_settings)
+        if conn_settings == connection_settings and _connections.get(db_alias):
+            existing_connection = _connections[db_alias]
+            break

-    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"}
+    # If an existing connection was found, assign it to the new alias
+    if existing_connection:
+        _connections[alias] = existing_connection
+    else:
+        # Otherwise, create the new connection for this alias. Raise
+        # MongoEngineConnectionError if it can't be established.
+        try:
+            _connections[alias] = connection_class(**conn_settings)
+        except Exception as e:
+            raise MongoEngineConnectionError(
+                'Cannot connect to database %s :\n%s' % (alias, e))

-    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]
+    return _connections[alias]


 def get_db(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
@ -350,18 +224,14 @@ def get_db(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
    if alias not in _dbs:
        conn = get_connection(alias)
        conn_settings = _connection_settings[alias]
-        db = conn[conn_settings["name"]]
-        auth_kwargs = {"source": conn_settings["authentication_source"]}
-        if conn_settings["authentication_mechanism"] is not None:
-            auth_kwargs["mechanism"] = conn_settings["authentication_mechanism"]
+        db = conn[conn_settings['name']]
+        auth_kwargs = {'source': conn_settings['authentication_source']}
+        if conn_settings['authentication_mechanism'] is not None:
+            auth_kwargs['mechanism'] = conn_settings['authentication_mechanism']
        # Authenticate if necessary
-        if conn_settings["username"] and (
-            conn_settings["password"]
-            or conn_settings["authentication_mechanism"] == "MONGODB-X509"
-        ):
-            db.authenticate(
-                conn_settings["username"], conn_settings["password"], **auth_kwargs
-            )
+        if conn_settings['username'] and (conn_settings['password'] or
+                                          conn_settings['authentication_mechanism'] == 'MONGODB-X509'):
+            db.authenticate(conn_settings['username'], conn_settings['password'], **auth_kwargs)
        _dbs[alias] = db
    return _dbs[alias]

@ -374,25 +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`.
-
-    In order to replace a connection identified by a given alias, you'll
-    need to call ``disconnect`` first
+    `alias` to connect to a different instance of :program:`mongod`.

    See the docstring for `register_connection` for more details about all
    supported kwargs.
-    """
-    if alias 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 = (
-                "A different connection with alias `{}` was already "
-                "registered. Use disconnect() first"
-            ).format(alias)
-            raise ConnectionFailure(err_msg)
-    else:
+    .. versionchanged:: 0.6 - added multiple database support.
+    """
+    if alias not in _connections:
        register_connection(alias, db, **kwargs)

    return get_connection(alias)
--- a/mongoengine/context_managers.py
+++ b/mongoengine/context_managers.py
@ -1,24 +1,12 @@
-from contextlib import contextmanager
-
-from pymongo.read_concern import ReadConcern
-from pymongo.write_concern import WriteConcern
-
 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",
-    "set_read_write_concern",
-)


-class switch_db:
+__all__ = ('switch_db', 'switch_collection', 'no_dereference',
+           'no_sub_classes', 'query_counter')
+
+
+class switch_db(object):
    """switch_db alias context manager.

    Example ::
@ -45,21 +33,21 @@ class switch_db:
        self.cls = cls
        self.collection = cls._get_collection()
        self.db_alias = db_alias
-        self.ori_db_alias = cls._meta.get("db_alias", DEFAULT_CONNECTION_NAME)
+        self.ori_db_alias = cls._meta.get('db_alias', DEFAULT_CONNECTION_NAME)

    def __enter__(self):
        """Change the db_alias and clear the cached collection."""
-        self.cls._meta["db_alias"] = self.db_alias
+        self.cls._meta['db_alias'] = self.db_alias
        self.cls._collection = None
        return self.cls

    def __exit__(self, t, value, traceback):
        """Reset the db_alias and collection."""
-        self.cls._meta["db_alias"] = self.ori_db_alias
+        self.cls._meta['db_alias'] = self.ori_db_alias
        self.cls._collection = self.collection


-class switch_collection:
+class switch_collection(object):
    """switch_collection alias context manager.

    Example ::
@ -101,7 +89,7 @@ class switch_collection:
        self.cls._get_collection_name = self.ori_get_collection_name


-class no_dereference:
+class no_dereference(object):
    """no_dereference context manager.

    Turns off all dereferencing in Documents for the duration of the context
@ -118,15 +106,14 @@ class no_dereference:
        """
        self.cls = cls

-        ReferenceField = _import_class("ReferenceField")
-        GenericReferenceField = _import_class("GenericReferenceField")
-        ComplexBaseField = _import_class("ComplexBaseField")
+        ReferenceField = _import_class('ReferenceField')
+        GenericReferenceField = _import_class('GenericReferenceField')
+        ComplexBaseField = _import_class('ComplexBaseField')

-        self.deref_fields = [
-            k
-            for k, v in self.cls._fields.items()
-            if isinstance(v, (ReferenceField, GenericReferenceField, ComplexBaseField))
-        ]
+        self.deref_fields = [k for k, v in self.cls._fields.iteritems()
+                             if isinstance(v, (ReferenceField,
+                                               GenericReferenceField,
+                                               ComplexBaseField))]

    def __enter__(self):
        """Change the objects default and _auto_dereference values."""
@ -141,7 +128,7 @@ class no_dereference:
        return self.cls


-class no_sub_classes:
+class no_sub_classes(object):
    """no_sub_classes context manager.

    Only returns instances of this class and no sub (inherited) classes::
@ -156,136 +143,75 @@ class no_sub_classes:
        :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._subclasses = (self.cls._class_name,)
+        self.cls._all_subclasses = self.cls._subclasses
+        self.cls._subclasses = (self.cls,)
        return self.cls

    def __exit__(self, t, value, traceback):
        """Reset the default and _auto_dereference values."""
-        self.cls._subclasses = self.cls_initial_subclasses
+        self.cls._subclasses = self.cls._all_subclasses
+        delattr(self.cls, '_all_subclasses')
+        return self.cls


-class query_counter:
-    """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 beginning of the context and counting the new entries.
+class query_counter(object):
+    """Query_counter context manager to get the number of queries."""

-    This was designed for debugging purpose. In fact it is a global counter so queries issued by other threads/processes
-    can interfere with it
+    def __init__(self):
+        """Construct the query_counter."""
+        self.counter = 0
+        self.db = get_db()

-    Usage:
-
-    .. code-block:: python
-
-        class User(Document):
-            name = StringField()
-
-        with query_counter() as q:
-            user = User(name='Bob')
-            assert q == 0       # no query fired yet
-            user.save()
-            assert q == 1       # 1 query was fired, an 'insert'
-            user_bis = User.objects().first()
-            assert q == 2       # a 2nd query was fired, a 'find_one'
-
-    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, alias=DEFAULT_CONNECTION_NAME):
-        self.db = get_db(alias=alias)
-        self.initial_profiling_level = None
-        self._ctx_query_counter = 0  # number of queries issued by the context
-
-        self._ignored_query = {
-            "ns": {"$ne": "%s.system.indexes" % self.db.name},
-            "op": {"$ne": "killcursors"},  # MONGODB < 3.2
-            "command.killCursors": {"$exists": False},  # MONGODB >= 3.2
-        }
-
-    def _turn_on_profiling(self):
-        self.initial_profiling_level = self.db.profiling_level()
+    def __enter__(self):
+        """On every with block we need to drop the profile collection."""
        self.db.set_profiling_level(0)
        self.db.system.profile.drop()
        self.db.set_profiling_level(2)
-
-    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):
        """repr query_counter as the number of queries."""
-        return "%s" % self._get_count()
+        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
-        and substracting the queries issued by this context. In fact everytime this is called, 1 query is
-        issued so we need to balance that
-        """
-        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
-        )
+        """Get the number of queries."""
+        ignore_query = {'ns': {'$ne': '%s.system.indexes' % self.db.name}}
+        count = self.db.system.profile.find(ignore_query).count() - self.counter
+        self.counter += 1
        return count
-
-
-@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))
-
-
-@contextmanager
-def set_read_write_concern(collection, write_concerns, read_concerns):
-    combined_write_concerns = dict(collection.write_concern.document.items())
-
-    if write_concerns is not None:
-        combined_write_concerns.update(write_concerns)
-
-    combined_read_concerns = dict(collection.read_concern.document.items())
-
-    if read_concerns is not None:
-        combined_read_concerns.update(read_concerns)
-
-    yield collection.with_options(
-        write_concern=WriteConcern(**combined_write_concerns),
-        read_concern=ReadConcern(**combined_read_concerns),
-    )
--- a/mongoengine/dereference.py
+++ b/mongoengine/dereference.py
@ -1,25 +1,15 @@
-from bson import SON, DBRef
+from bson import DBRef, SON
+import six

-from mongoengine.base import (
-    BaseDict,
-    BaseList,
-    EmbeddedDocumentList,
-    TopLevelDocumentMetaclass,
-    get_document,
-)
-from mongoengine.base.datastructures import LazyReference
+from mongoengine.base import (BaseDict, BaseList, EmbeddedDocumentList,
+                              TopLevelDocumentMetaclass, get_document)
 from mongoengine.connection import get_db
 from mongoengine.document import Document, EmbeddedDocument
-from mongoengine.fields import (
-    DictField,
-    ListField,
-    MapField,
-    ReferenceField,
-)
+from mongoengine.fields import DictField, ListField, MapField, ReferenceField
 from mongoengine.queryset import QuerySet


-class DeReference:
+class DeReference(object):
    def __call__(self, items, max_depth=1, instance=None, name=None):
        """
        Cheaply dereferences the items to a set depth.
@ -33,7 +23,7 @@ class DeReference:
            :class:`~mongoengine.base.ComplexBaseField`
        :param get: A boolean determining if being called by __get__
        """
-        if items is None or isinstance(items, str):
+        if items is None or isinstance(items, six.string_types):
            return items

        # cheapest way to convert a queryset to a list
@ -44,59 +34,43 @@ class DeReference:
        self.max_depth = max_depth
        doc_type = None

-        if instance and isinstance(
-            instance, (Document, EmbeddedDocument, TopLevelDocumentMetaclass)
-        ):
+        if instance and isinstance(instance, (Document, EmbeddedDocument,
+                                              TopLevelDocumentMetaclass)):
            doc_type = instance._fields.get(name)
-            while hasattr(doc_type, "field"):
+            while hasattr(doc_type, 'field'):
                doc_type = doc_type.field

            if isinstance(doc_type, ReferenceField):
                field = doc_type
                doc_type = doc_type.document_type
-                is_list = not hasattr(items, "items")
+                is_list = not hasattr(items, 'items')

-                if is_list and all(i.__class__ == doc_type for i in items):
+                if is_list and all([i.__class__ == doc_type for i in items]):
                    return items
                elif not is_list and all(
-                    i.__class__ == doc_type for i in items.values()
-                ):
+                        [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
-                    # 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(items):
+                            new_items = []
+                            for v in items:
+                                if isinstance(v, list):
+                                    new_items.append(_get_items(v))
+                                elif not isinstance(v, (DBRef, Document)):
+                                    new_items.append(field.to_python(v))
+                                else:
+                                    new_items.append(v)
+                            return new_items

-                    def _get_items_from_dict(items):
-                        new_items = {}
-                        for k, v in items.items():
-                            value = v
-                            if isinstance(v, list):
-                                value = _get_items_from_list(v)
-                            elif isinstance(v, dict):
-                                value = _get_items_from_dict(v)
-                            elif not isinstance(v, (DBRef, Document)):
-                                value = field.to_python(v)
-                            new_items[k] = value
-                        return new_items
-
-                    if not hasattr(items, "items"):
-                        items = _get_items_from_list(items)
+                        items = _get_items(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)
@ -123,85 +97,63 @@ class DeReference:
        depth += 1
        for item in iterator:
            if isinstance(item, (Document, EmbeddedDocument)):
-                for field_name, field in item._fields.items():
+                for field_name, field in item._fields.iteritems():
                    v = item._data.get(field_name, None)
-                    if isinstance(v, LazyReference):
-                        # LazyReference inherits DBRef but should not be dereferenced here !
-                        continue
-                    elif isinstance(v, DBRef):
+                    if 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, 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
-                        )
+                        field_cls = getattr(getattr(field, 'field', None), 'document_type', None)
                        references = self._find_references(v, depth)
-                        for key, refs in references.items():
-                            if isinstance(
-                                field_cls, (Document, TopLevelDocumentMetaclass)
-                            ):
+                        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, 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 references.items():
+                for key, refs in references.iteritems():
                    reference_map.setdefault(key, set()).update(refs)

        return reference_map

    def _fetch_objects(self, doc_type=None):
-        """Fetch all references and convert to their document objects"""
+        """Fetch all references and convert to their document objects
+        """
        object_map = {}
-        for collection, dbrefs in self.reference_map.items():
-
-            # 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:
+        for collection, dbrefs in self.reference_map.iteritems():
+            if hasattr(collection, 'objects'):  # We have a document class for the refs
                col_name = collection._get_collection_name()
-                refs = [
-                    dbref for dbref in dbrefs if (col_name, dbref) not in object_map
-                ]
+                refs = [dbref for dbref in dbrefs
+                        if (col_name, dbref) not in object_map]
                references = collection.objects.in_bulk(refs)
-                for key, doc in references.items():
+                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 if (collection, dbref) not in object_map
-                ]
+                refs = [dbref for dbref in dbrefs
+                        if (collection, dbref) not in object_map]

                if doc_type:
-                    references = doc_type._get_db()[collection].find(
-                        {"_id": {"$in": refs}}
-                    )
+                    references = doc_type._get_db()[collection].find({'_id': {'$in': refs}})
                    for ref in references:
                        doc = doc_type._from_son(ref)
                        object_map[(collection, doc.id)] = doc
                else:
-                    references = get_db()[collection].find({"_id": {"$in": refs}})
+                    references = get_db()[collection].find({'_id': {'$in': refs}})
                    for ref in references:
-                        if "_cls" in ref:
-                            doc = get_document(ref["_cls"])._from_son(ref)
+                        if '_cls' in ref:
+                            doc = get_document(ref['_cls'])._from_son(ref)
                        elif doc_type is None:
                            doc = get_document(
-                                "".join(x.capitalize() for x in collection.split("_"))
-                            )._from_son(ref)
+                                ''.join(x.capitalize()
+                                        for x in collection.split('_')))._from_son(ref)
                        else:
                            doc = doc_type._from_son(ref)
                        object_map[(collection, doc.id)] = doc
@ -229,20 +181,19 @@ class DeReference:
                    return BaseList(items, instance, name)

        if isinstance(items, (dict, SON)):
-            if "_ref" in items:
+            if '_ref' in items:
                return self.object_map.get(
-                    (items["_ref"].collection, items["_ref"].id), items
-                )
-            elif "_cls" in items:
-                doc = get_document(items["_cls"])._from_son(items)
-                _cls = doc._data.pop("_cls", None)
-                del items["_cls"]
+                    (items['_ref'].collection, items['_ref'].id), items)
+            elif '_cls' in items:
+                doc = get_document(items['_cls'])._from_son(items)
+                _cls = doc._data.pop('_cls', None)
+                del items['_cls']
                doc._data = self._attach_objects(doc._data, depth, doc, None)
                if _cls is not None:
-                    doc._data["_cls"] = _cls
+                    doc._data['_cls'] = _cls
                return doc

-        if not hasattr(items, "items"):
+        if not hasattr(items, 'items'):
            is_list = True
            list_type = BaseList
            if isinstance(items, EmbeddedDocumentList):
@ -252,7 +203,7 @@ class DeReference:
            data = []
        else:
            is_list = False
-            iterator = items.items()
+            iterator = items.iteritems()
            data = {}

        depth += 1
@ -269,23 +220,17 @@ class DeReference:
                    v = data[k]._data.get(field_name, None)
                    if isinstance(v, DBRef):
                        data[k]._data[field_name] = self.object_map.get(
-                            (v.collection, v.id), v
-                        )
-                    elif isinstance(v, (dict, SON)) and "_ref" in v:
+                            (v.collection, v.id), v)
+                    elif isinstance(v, (dict, SON)) and '_ref' in v:
                        data[k]._data[field_name] = self.object_map.get(
-                            (v["_ref"].collection, v["_ref"].id), v
-                        )
+                            (v['_ref'].collection, v['_ref'].id), v)
                    elif isinstance(v, (dict, list, tuple)) and depth <= self.max_depth:
-                        item_name = f"{name}.{k}.{field_name}"
-                        data[k]._data[field_name] = self._attach_objects(
-                            v, depth, instance=instance, name=item_name
-                        )
+                        item_name = six.text_type('{0}.{1}.{2}').format(name, k, field_name)
+                        data[k]._data[field_name] = self._attach_objects(v, depth, instance=instance, name=item_name)
            elif isinstance(v, (dict, list, tuple)) and depth <= self.max_depth:
-                item_name = f"{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"):
+                item_name = '%s.%s' % (name, k) if name else name
+                data[k] = self._attach_objects(v, depth - 1, instance=instance, name=item_name)
+            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
--- a/mongoengine/errors.py
+++ b/mongoengine/errors.py
@ -1,31 +1,18 @@
 from collections import defaultdict

-__all__ = (
-    "NotRegistered",
-    "InvalidDocumentError",
-    "LookUpError",
-    "DoesNotExist",
-    "MultipleObjectsReturned",
-    "InvalidQueryError",
-    "OperationError",
-    "NotUniqueError",
-    "BulkWriteError",
-    "FieldDoesNotExist",
-    "ValidationError",
-    "SaveConditionError",
-    "DeprecatedError",
-)
+import six
+
+__all__ = ('NotRegistered', 'InvalidDocumentError', 'LookUpError',
+           'DoesNotExist', 'MultipleObjectsReturned', 'InvalidQueryError',
+           'OperationError', 'NotUniqueError', 'FieldDoesNotExist',
+           'ValidationError', 'SaveConditionError')


-class MongoEngineException(Exception):
+class NotRegistered(Exception):
    pass


-class NotRegistered(MongoEngineException):
-    pass
-
-
-class InvalidDocumentError(MongoEngineException):
+class InvalidDocumentError(Exception):
    pass


@ -33,19 +20,19 @@ class LookUpError(AttributeError):
    pass


-class DoesNotExist(MongoEngineException):
+class DoesNotExist(Exception):
    pass


-class MultipleObjectsReturned(MongoEngineException):
+class MultipleObjectsReturned(Exception):
    pass


-class InvalidQueryError(MongoEngineException):
+class InvalidQueryError(Exception):
    pass


-class OperationError(MongoEngineException):
+class OperationError(Exception):
    pass


@ -53,15 +40,11 @@ class NotUniqueError(OperationError):
    pass


-class BulkWriteError(OperationError):
-    pass
-
-
 class SaveConditionError(OperationError):
    pass


-class FieldDoesNotExist(MongoEngineException):
+class FieldDoesNotExist(Exception):
    """Raised when trying to set a field
    not declared in a :class:`~mongoengine.Document`
    or an :class:`~mongoengine.EmbeddedDocument`.
@ -87,25 +70,24 @@ class ValidationError(AssertionError):
    field_name = None
    _message = None

-    def __init__(self, message="", **kwargs):
-        super().__init__(message)
-        self.errors = kwargs.get("errors", {})
-        self.field_name = kwargs.get("field_name")
+    def __init__(self, message='', **kwargs):
+        self.errors = kwargs.get('errors', {})
+        self.field_name = kwargs.get('field_name')
        self.message = message

    def __str__(self):
-        return str(self.message)
+        return six.text_type(self.message)

    def __repr__(self):
-        return f"{self.__class__.__name__}({self.message},)"
+        return '%s(%s,)' % (self.__class__.__name__, self.message)

    def __getattribute__(self, name):
-        message = super().__getattribute__(name)
-        if name == "message":
+        message = super(ValidationError, self).__getattribute__(name)
+        if name == 'message':
            if self.field_name:
-                message = "%s" % message
+                message = '%s' % message
            if self.errors:
-                message = f"{message}({self._format_errors()})"
+                message = '%s(%s)' % (message, self._format_errors())
        return message

    def _get_message(self):
@ -126,13 +108,16 @@ class ValidationError(AssertionError):

        def build_dict(source):
            errors_dict = {}
+            if not source:
+                return errors_dict
+
            if isinstance(source, dict):
-                for field_name, error in source.items():
+                for field_name, error in source.iteritems():
                    errors_dict[field_name] = build_dict(error)
            elif isinstance(source, ValidationError) and source.errors:
                return build_dict(source.errors)
            else:
-                return str(source)
+                return six.text_type(source)

            return errors_dict

@ -144,22 +129,17 @@ class ValidationError(AssertionError):
    def _format_errors(self):
        """Returns a string listing all errors within a document"""

-        def generate_key(value, prefix=""):
+        def generate_key(value, prefix=''):
            if isinstance(value, list):
-                value = " ".join([generate_key(k) for k in value])
+                value = ' '.join([generate_key(k) for k in value])
            elif isinstance(value, dict):
-                value = " ".join([generate_key(v, k) for k, v in value.items()])
+                value = ' '.join(
+                    [generate_key(v, k) for k, v in value.iteritems()])

-            results = f"{prefix}.{value}" if prefix else value
+            results = '%s.%s' % (prefix, value) if prefix else value
            return results

        error_dict = defaultdict(list)
-        for k, v in self.to_dict().items():
+        for k, v in self.to_dict().iteritems():
            error_dict[generate_key(v)].append(k)
-        return " ".join([f"{k}: {v}" for k, v in error_dict.items()])
-
-
-class DeprecatedError(MongoEngineException):
-    """Raise when a user uses a feature that has been Deprecated"""
-
-    pass
+        return ' '.join(['%s: %s' % (k, v) for k, v in error_dict.iteritems()])
--- a/mongoengine/fields.py
+++ b/mongoengine/fields.py
--- a/mongoengine/mongodb_support.py
+++ b/mongoengine/mongodb_support.py
@ -1,20 +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)
-MONGODB_42 = (4, 2)
-MONGODB_44 = (4, 4)
-
-
-def get_mongodb_version():
-    """Return the version of the default 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
@ -1,60 +0,0 @@
-"""
-Helper functions, constants, and types to aid with PyMongo v2.7 - v3.x support.
-"""
-import pymongo
-from pymongo.errors import OperationFailure
-
-_PYMONGO_37 = (3, 7)
-
-PYMONGO_VERSION = tuple(pymongo.version_tuple[:2])
-
-IS_PYMONGO_GTE_37 = PYMONGO_VERSION >= _PYMONGO_37
-
-
-def count_documents(
-    collection, filter, skip=None, limit=None, hint=None, collation=None
-):
-    """Pymongo>3.7 deprecates count in favour of count_documents"""
-    if limit == 0:
-        return 0  # Pymongo raises an OperationFailure if called with limit=0
-
-    kwargs = {}
-    if skip is not None:
-        kwargs["skip"] = skip
-    if limit is not None:
-        kwargs["limit"] = limit
-    if hint not in (-1, None):
-        kwargs["hint"] = hint
-    if collation is not None:
-        kwargs["collation"] = collation
-
-    # count_documents appeared in pymongo 3.7
-    if IS_PYMONGO_GTE_37:
-        try:
-            return collection.count_documents(filter=filter, **kwargs)
-        except OperationFailure:
-            # OperationFailure - accounts for some operators that used to work
-            # with .count but are no longer working with count_documents (i.e $geoNear, $near, and $nearSphere)
-            # fallback to deprecated Cursor.count
-            # Keeping this should be reevaluated the day pymongo removes .count entirely
-            pass
-
-    cursor = collection.find(filter)
-    for option, option_value in kwargs.items():
-        cursor_method = getattr(cursor, option)
-        cursor = cursor_method(option_value)
-    with_limit_and_skip = "skip" in kwargs or "limit" in kwargs
-    return cursor.count(with_limit_and_skip=with_limit_and_skip)
-
-
-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
@ -0,0 +1,25 @@
+"""
+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
+
+# Additionally for Py2, try to use the faster cStringIO, if available
+if not six.PY3:
+    try:
+        import cStringIO
+    except ImportError:
+        pass
+    else:
+        StringIO = cStringIO.StringIO
--- a/mongoengine/queryset/init.py
+++ b/mongoengine/queryset/init.py
@ -7,22 +7,11 @@ from mongoengine.queryset.visitor import *

 # Expose just the public subset of all imported objects and constants.
 __all__ = (
-    "QuerySet",
-    "QuerySetNoCache",
-    "Q",
-    "queryset_manager",
-    "QuerySetManager",
-    "QueryFieldList",
-    "DO_NOTHING",
-    "NULLIFY",
-    "CASCADE",
-    "DENY",
-    "PULL",
+    'QuerySet', 'QuerySetNoCache', 'Q', 'queryset_manager', 'QuerySetManager',
+    'QueryFieldList', 'DO_NOTHING', 'NULLIFY', 'CASCADE', 'DENY', 'PULL',
+
    # Errors that might be related to a queryset, mostly here for backward
    # compatibility
-    "DoesNotExist",
-    "InvalidQueryError",
-    "MultipleObjectsReturned",
-    "NotUniqueError",
-    "OperationError",
+    'DoesNotExist', 'InvalidQueryError', 'MultipleObjectsReturned',
+    'NotUniqueError', 'OperationError',
 )
--- a/mongoengine/queryset/base.py
+++ b/mongoengine/queryset/base.py
--- a/mongoengine/queryset/field_list.py
+++ b/mongoengine/queryset/field_list.py
@ -1,15 +1,12 @@
-__all__ = ("QueryFieldList",)
+__all__ = ('QueryFieldList',)


-class QueryFieldList:
+class QueryFieldList(object):
    """Object that handles combinations of .only() and .exclude() calls"""
-
    ONLY = 1
    EXCLUDE = 0

-    def __init__(
-        self, fields=None, value=ONLY, always_include=None, _only_called=False
-    ):
+    def __init__(self, fields=None, value=ONLY, always_include=None, _only_called=False):
        """The QueryFieldList builder

        :param fields: A list of fields used in `.only()` or `.exclude()`
@ -52,7 +49,7 @@ class QueryFieldList:
            self.fields = f.fields - self.fields
            self._clean_slice()

-        if "_id" in f.fields:
+        if '_id' in f.fields:
            self._id = f.value

        if self.always_include:
@ -62,11 +59,11 @@ class QueryFieldList:
            else:
                self.fields -= self.always_include

-        if getattr(f, "_only_called", False):
+        if getattr(f, '_only_called', False):
            self._only_called = True
        return self

-    def __bool__(self):
+    def __nonzero__(self):
        return bool(self.fields)

    def as_dict(self):
@ -74,11 +71,11 @@ class QueryFieldList:
        if self.slice:
            field_list.update(self.slice)
        if self._id is not None:
-            field_list["_id"] = self._id
+            field_list['_id'] = self._id
        return field_list

    def reset(self):
-        self.fields = set()
+        self.fields = set([])
        self.slice = {}
        self.value = self.ONLY

--- a/mongoengine/queryset/manager.py
+++ b/mongoengine/queryset/manager.py
@ -1,11 +1,10 @@
 from functools import partial
-
 from mongoengine.queryset.queryset import QuerySet

-__all__ = ("queryset_manager", "QuerySetManager")
+__all__ = ('queryset_manager', 'QuerySetManager')


-class QuerySetManager:
+class QuerySetManager(object):
    """
    The default QuerySet Manager.

@ -34,10 +33,10 @@ class QuerySetManager:
            return self

        # owner is the document that contains the QuerySetManager
-        queryset_class = owner._meta.get("queryset_class", self.default)
+        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
@ -1,22 +1,9 @@
 from mongoengine.errors import OperationError
-from mongoengine.queryset.base import (
-    CASCADE,
-    DENY,
-    DO_NOTHING,
-    NULLIFY,
-    PULL,
-    BaseQuerySet,
-)
+from mongoengine.queryset.base import (BaseQuerySet, CASCADE, DENY, DO_NOTHING,
+                                       NULLIFY, PULL)

-__all__ = (
-    "QuerySet",
-    "QuerySetNoCache",
-    "DO_NOTHING",
-    "NULLIFY",
-    "CASCADE",
-    "DENY",
-    "PULL",
-)
+__all__ = ('QuerySet', 'QuerySetNoCache', 'DO_NOTHING', 'NULLIFY', 'CASCADE',
+           'DENY', 'PULL')

 # The maximum number of items to display in a QuerySet.__repr__
 REPR_OUTPUT_SIZE = 20
@ -68,12 +55,12 @@ class QuerySet(BaseQuerySet):
    def __repr__(self):
        """Provide a string representation of the QuerySet"""
        if self._iter:
-            return ".. queryset mid-iteration .."
+            return '.. queryset mid-iteration ..'

        self._populate_cache()
-        data = self._result_cache[: REPR_OUTPUT_SIZE + 1]
+        data = self._result_cache[:REPR_OUTPUT_SIZE + 1]
        if len(data) > REPR_OUTPUT_SIZE:
-            data[-1] = "...(remaining elements truncated)..."
+            data[-1] = '...(remaining elements truncated)...'
        return repr(data)

    def _iter_results(self):
@ -100,10 +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:
@ -125,8 +112,8 @@ class QuerySet(BaseQuerySet):
        # Pull in ITER_CHUNK_SIZE docs from the database and store them in
        # the result cache.
        try:
-            for _ in range(ITER_CHUNK_SIZE):
-                self._result_cache.append(next(self))
+            for _ in xrange(ITER_CHUNK_SIZE):
+                self._result_cache.append(self.next())
        except StopIteration:
            # Getting this exception means there are no more docs in the
            # db cursor. Set _has_more to False so that we can use that
@ -141,43 +128,52 @@ class QuerySet(BaseQuerySet):
            getting the count
        """
        if with_limit_and_skip is False:
-            return super().count(with_limit_and_skip)
+            return super(QuerySet, self).count(with_limit_and_skip)

        if self._len is None:
-            # cache the length
-            self._len = super().count(with_limit_and_skip)
+            self._len = super(QuerySet, self).count(with_limit_and_skip)

        return self._len

    def no_cache(self):
-        """Convert to a non-caching queryset"""
-        if self._result_cache is not None:
-            raise OperationError("QuerySet already cached")
+        """Convert to a non-caching queryset

-        return self._clone_into(QuerySetNoCache(self._document, self._collection))
+        .. versionadded:: 0.8.3 Convert to non caching queryset
+        """
+        if self._result_cache is not None:
+            raise OperationError('QuerySet already cached')
+
+        return self._clone_into(QuerySetNoCache(self._document,
+                                                self._collection))


 class QuerySetNoCache(BaseQuerySet):
    """A non caching QuerySet"""

    def cache(self):
-        """Convert to a caching queryset"""
+        """Convert to a caching queryset
+
+        .. versionadded:: 0.8.3 Convert to caching queryset
+        """
        return self._clone_into(QuerySet(self._document, self._collection))

    def __repr__(self):
-        """Provides the string representation of the QuerySet"""
+        """Provides the string representation of the QuerySet
+
+        .. versionchanged:: 0.6.13 Now doesnt modify the cursor
+        """
        if self._iter:
-            return ".. queryset mid-iteration .."
+            return '.. queryset mid-iteration ..'

        data = []
-        for _ in range(REPR_OUTPUT_SIZE + 1):
+        for _ in xrange(REPR_OUTPUT_SIZE + 1):
            try:
-                data.append(next(self))
+                data.append(self.next())
            except StopIteration:
                break

        if len(data) > REPR_OUTPUT_SIZE:
-            data[-1] = "...(remaining elements truncated)..."
+            data[-1] = '...(remaining elements truncated)...'

        self.rewind()
        return repr(data)
@ -188,3 +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
@ -1,65 +1,31 @@
 from collections import defaultdict

-import pymongo
-from bson import SON, ObjectId
+from bson import ObjectId, SON
 from bson.dbref import DBRef
+import pymongo
+import six

 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", "STRING_OPERATORS")
+__all__ = ('query', 'update')

-COMPARISON_OPERATORS = (
-    "ne",
-    "gt",
-    "gte",
-    "lt",
-    "lte",
-    "in",
-    "nin",
-    "mod",
-    "all",
-    "size",
-    "exists",
-    "not",
-    "elemMatch",
-    "type",
-)
-GEO_OPERATORS = (
-    "within_distance",
-    "within_spherical_distance",
-    "within_box",
-    "within_polygon",
-    "near",
-    "near_sphere",
-    "max_distance",
-    "min_distance",
-    "geo_within",
-    "geo_within_box",
-    "geo_within_polygon",
-    "geo_within_center",
-    "geo_within_sphere",
-    "geo_intersects",
-)
-STRING_OPERATORS = (
-    "contains",
-    "icontains",
-    "startswith",
-    "istartswith",
-    "endswith",
-    "iendswith",
-    "exact",
-    "iexact",
-    "regex",
-    "iregex",
-    "wholeword",
-    "iwholeword",
-)
-CUSTOM_OPERATORS = ("match",)
-MATCH_OPERATORS = (
-    COMPARISON_OPERATORS + GEO_OPERATORS + STRING_OPERATORS + CUSTOM_OPERATORS
-)
+COMPARISON_OPERATORS = ('ne', 'gt', 'gte', 'lt', 'lte', 'in', 'nin', 'mod',
+                        'all', 'size', 'exists', 'not', 'elemMatch', 'type')
+GEO_OPERATORS = ('within_distance', 'within_spherical_distance',
+                 'within_box', 'within_polygon', 'near', 'near_sphere',
+                 'max_distance', 'min_distance', 'geo_within', 'geo_within_box',
+                 'geo_within_polygon', 'geo_within_center',
+                 'geo_within_sphere', 'geo_intersects')
+STRING_OPERATORS = ('contains', 'icontains', 'startswith',
+                    'istartswith', 'endswith', 'iendswith',
+                    'exact', 'iexact')
+CUSTOM_OPERATORS = ('match',)
+MATCH_OPERATORS = (COMPARISON_OPERATORS + GEO_OPERATORS +
+                   STRING_OPERATORS + CUSTOM_OPERATORS)


 # TODO make this less complex
@ -68,11 +34,11 @@ def query(_doc_cls=None, **kwargs):
    mongo_query = {}
    merge_query = defaultdict(list)
    for key, value in sorted(kwargs.items()):
-        if key == "__raw__":
+        if key == '__raw__':
            mongo_query.update(value)
            continue

-        parts = key.rsplit("__")
+        parts = key.rsplit('__')
        indices = [(i, p) for i, p in enumerate(parts) if p.isdigit()]
        parts = [part for part in parts if not part.isdigit()]
        # Check for an operator and transform to mongo-style if there is
@ -81,11 +47,11 @@ def query(_doc_cls=None, **kwargs):
            op = parts.pop()

        # Allow to escape operator-like field name by __
-        if len(parts) > 1 and parts[-1] == "":
+        if len(parts) > 1 and parts[-1] == '':
            parts.pop()

        negate = False
-        if len(parts) > 1 and parts[-1] == "not":
+        if len(parts) > 1 and parts[-1] == 'not':
            parts.pop()
            negate = True

@ -97,18 +63,18 @@ def query(_doc_cls=None, **kwargs):
                raise InvalidQueryError(e)
            parts = []

-            CachedReferenceField = _import_class("CachedReferenceField")
-            GenericReferenceField = _import_class("GenericReferenceField")
+            CachedReferenceField = _import_class('CachedReferenceField')
+            GenericReferenceField = _import_class('GenericReferenceField')

            cleaned_fields = []
            for field in fields:
                append_field = True
-                if isinstance(field, str):
+                if isinstance(field, six.string_types):
                    parts.append(field)
                    append_field = False
                # is last and CachedReferenceField
                elif isinstance(field, CachedReferenceField) and fields[-1] == field:
-                    parts.append("%s._id" % field.db_field)
+                    parts.append('%s._id' % field.db_field)
                else:
                    parts.append(field.db_field)

@ -118,17 +84,38 @@ def query(_doc_cls=None, **kwargs):
            # Convert value to proper value
            field = cleaned_fields[-1]

-            singular_ops = [None, "ne", "gt", "gte", "lt", "lte", "not"]
+            singular_ops = [None, 'ne', 'gt', 'gte', 'lt', 'lte', 'not']
            singular_ops += STRING_OPERATORS
            if op in singular_ops:
-                value = field.prepare_query_value(op, value)
+                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"]
+                    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.
-                value = _prepare_query_for_iterable(field, op, value)
+            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. 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]).")
+                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:
@ -136,77 +123,73 @@ def query(_doc_cls=None, **kwargs):
            # * If the value is an ObjectId, the key should be "field_name._ref.$id".
            if isinstance(field, GenericReferenceField):
                if isinstance(value, DBRef):
-                    parts[-1] += "._ref"
+                    parts[-1] += '._ref'
                elif isinstance(value, ObjectId):
-                    parts[-1] += "._ref.$id"
+                    parts[-1] += '._ref.$id'

        # if op and op not in COMPARISON_OPERATORS:
        if op:
            if op in GEO_OPERATORS:
                value = _geo_operator(field, op, value)
-            elif op in ("match", "elemMatch"):
-                ListField = _import_class("ListField")
-                EmbeddedDocumentField = _import_class("EmbeddedDocumentField")
+            elif op in ('match', 'elemMatch'):
+                ListField = _import_class('ListField')
+                EmbeddedDocumentField = _import_class('EmbeddedDocumentField')
                if (
-                    isinstance(value, dict)
-                    and isinstance(field, ListField)
-                    and isinstance(field.field, EmbeddedDocumentField)
+                    isinstance(value, dict) and
+                    isinstance(field, ListField) and
+                    isinstance(field.field, EmbeddedDocumentField)
                ):
                    value = query(field.field.document_type, **value)
                else:
                    value = field.prepare_query_value(op, value)
-                value = {"$elemMatch": value}
+                value = {'$elemMatch': value}
            elif op in CUSTOM_OPERATORS:
-                NotImplementedError(
-                    'Custom method "%s" has not ' "been implemented" % op
-                )
+                NotImplementedError('Custom method "%s" has not '
+                                    'been implemented' % op)
            elif op not in STRING_OPERATORS:
-                value = {"$" + op: value}
+                value = {'$' + op: value}

        if negate:
-            value = {"$not": value}
+            value = {'$not': value}

        for i, part in indices:
            parts.insert(i, part)

-        key = ".".join(parts)
+        key = '.'.join(parts)

-        if key not in mongo_query:
+        if op is None or key not in mongo_query:
            mongo_query[key] = value
-        else:
-            if isinstance(mongo_query[key], dict) and isinstance(value, dict):
+        elif key in mongo_query:
+            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 "$nearSphere" in value_dict
-                ):
+                if ('$maxDistance' in value_dict or '$minDistance' in value_dict) and \
+                        ('$near' in value_dict or '$nearSphere' in value_dict):
                    value_son = SON()
-                    for k, v in value_dict.items():
-                        if k == "$maxDistance" or k == "$minDistance":
+                    for k, v in value_dict.iteritems():
+                        if k == '$maxDistance' or k == '$minDistance':
                            continue
                        value_son[k] = v
                    # Required for MongoDB >= 2.6, may fail when combining
                    # PyMongo 3+ and MongoDB < 2.6
                    near_embedded = False
-                    for near_op in ("$near", "$nearSphere"):
-                        if isinstance(value_dict.get(near_op), dict):
+                    for near_op in ('$near', '$nearSphere'):
+                        if isinstance(value_dict.get(near_op), dict) and (
+                                IS_PYMONGO_3 or get_connection().max_wire_version > 1):
                            value_son[near_op] = SON(value_son[near_op])
-                            if "$maxDistance" in value_dict:
-                                value_son[near_op]["$maxDistance"] = value_dict[
-                                    "$maxDistance"
-                                ]
-                            if "$minDistance" in value_dict:
-                                value_son[near_op]["$minDistance"] = value_dict[
-                                    "$minDistance"
-                                ]
+                            if '$maxDistance' in value_dict:
+                                value_son[near_op][
+                                    '$maxDistance'] = value_dict['$maxDistance']
+                            if '$minDistance' in value_dict:
+                                value_son[near_op][
+                                    '$minDistance'] = value_dict['$minDistance']
                            near_embedded = True
-
                    if not near_embedded:
-                        if "$maxDistance" in value_dict:
-                            value_son["$maxDistance"] = value_dict["$maxDistance"]
-                        if "$minDistance" in value_dict:
-                            value_son["$minDistance"] = value_dict["$minDistance"]
+                        if '$maxDistance' in value_dict:
+                            value_son['$maxDistance'] = value_dict['$maxDistance']
+                        if '$minDistance' in value_dict:
+                            value_son['$minDistance'] = value_dict['$minDistance']
                    mongo_query[key] = value_son
            else:
                # Store for manually merging later
@ -218,10 +201,10 @@ def query(_doc_cls=None, **kwargs):
        del mongo_query[k]
        if isinstance(v, list):
            value = [{k: val} for val in v]
-            if "$and" in mongo_query.keys():
-                mongo_query["$and"].extend(value)
+            if '$and' in mongo_query.keys():
+                mongo_query['$and'].extend(value)
            else:
-                mongo_query["$and"] = value
+                mongo_query['$and'] = value

    return mongo_query

@ -231,44 +214,37 @@ def update(_doc_cls=None, **update):
    format.
    """
    mongo_update = {}
-
    for key, value in update.items():
-        if key == "__raw__":
+        if key == '__raw__':
            mongo_update.update(value)
            continue
-
-        parts = key.split("__")
-
+        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")
-
+            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 = {
-                "push_all": "pushAll",
-                "pull_all": "pullAll",
-                "dec": "inc",
-                "add_to_set": "addToSet",
-                "set_on_insert": "setOnInsert",
-            }
-            if op == "dec":
+            if op in ('push_all', 'pull_all'):
+                op = op.replace('_all', 'All')
+            elif op == 'dec':
                # Support decrement by flipping a positive value's sign
                # and using 'inc'
+                op = 'inc'
                value = -value
-            # If the operator doesn't found from operator map, the op value
-            # will stay unchanged
-            op = operator_map.get(op, op)
+            elif op == 'add_to_set':
+                op = 'addToSet'
+            elif op == 'set_on_insert':
+                op = 'setOnInsert'

        match = None
        if parts[-1] in COMPARISON_OPERATORS:
            match = parts.pop()

        # Allow to escape operator-like field name by __
-        if len(parts) > 1 and parts[-1] == "":
+        if len(parts) > 1 and parts[-1] == '':
            parts.pop()

        if _doc_cls:
@ -283,10 +259,10 @@ def update(_doc_cls=None, **update):
            appended_sub_field = False
            for field in fields:
                append_field = True
-                if isinstance(field, str):
+                if isinstance(field, six.string_types):
                    # Convert the S operator to $
-                    if field == "S":
-                        field = "$"
+                    if field == 'S':
+                        field = '$'
                    parts.append(field)
                    append_field = False
                else:
@ -294,7 +270,7 @@ def update(_doc_cls=None, **update):
                if append_field:
                    appended_sub_field = False
                    cleaned_fields.append(field)
-                    if hasattr(field, "field"):
+                    if hasattr(field, 'field'):
                        cleaned_fields.append(field.field)
                        appended_sub_field = True

@ -304,91 +280,63 @@ def update(_doc_cls=None, **update):
            else:
                field = cleaned_fields[-1]

-            GeoJsonBaseField = _import_class("GeoJsonBaseField")
+            GeoJsonBaseField = _import_class('GeoJsonBaseField')
            if isinstance(field, GeoJsonBaseField):
                value = field.to_mongo(value)

-            if op == "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 op in (None, 'set', 'push', 'pull'):
                if field.required or value is not None:
                    value = field.prepare_query_value(op, value)
-            elif op in ("pushAll", "pullAll"):
+            elif op in ('pushAll', 'pullAll'):
                value = [field.prepare_query_value(op, v) for v in value]
-            elif op in ("addToSet", "setOnInsert"):
+            elif op in ('addToSet', 'setOnInsert'):
                if isinstance(value, (list, tuple, set)):
                    value = [field.prepare_query_value(op, v) for v in value]
                elif field.required or value is not None:
                    value = field.prepare_query_value(op, value)
-            elif op == "unset":
+            elif op == 'unset':
                value = 1
-            elif op == "inc":
-                value = field.prepare_query_value(op, value)

        if match:
-            match = "$" + match
+            match = '$' + match
            value = {match: value}

-        key = ".".join(parts)
+        key = '.'.join(parts)

-        if "pull" in op and "." in key:
+        if not op:
+            raise InvalidQueryError('Updates must supply an operation '
+                                    'eg: set__FIELD=value')
+
+        if 'pull' in op and '.' in key:
            # Dot operators don't work on pull operations
            # unless they point to a list field
            # Otherwise it uses nested dict syntax
-            if op == "pullAll":
-                raise InvalidQueryError(
-                    "pullAll operations only support a single field depth"
-                )
+            if op == 'pullAll':
+                raise InvalidQueryError('pullAll operations only support '
+                                        'a single field depth')

            # Look for the last list field and use dot notation until there
            field_classes = [c.__class__ for c in cleaned_fields]
            field_classes.reverse()
-            ListField = _import_class("ListField")
-            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
+            ListField = _import_class('ListField')
+            if ListField in field_classes:
+                # Join all fields via dot notation to the last ListField
                # Then process as normal
-                if ListField in field_classes:
-                    _check_field = ListField
-                else:
-                    _check_field = EmbeddedDocumentListField
-
-                last_listField = len(cleaned_fields) - field_classes.index(_check_field)
-                key = ".".join(parts[:last_listField])
+                last_listField = len(
+                    cleaned_fields) - field_classes.index(ListField)
+                key = '.'.join(parts[:last_listField])
                parts = parts[last_listField:]
                parts.insert(0, key)

            parts.reverse()
            for key in parts:
                value = {key: value}
-        elif op == "addToSet" and isinstance(value, list):
-            value = {key: {"$each": value}}
-        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}
+        elif op == 'addToSet' and isinstance(value, list):
+            value = {key: {'$each': value}}
        else:
            value = {key: value}
-        key = "$" + op
+        key = '$' + op
+
        if key not in mongo_update:
            mongo_update[key] = value
        elif key in mongo_update and isinstance(mongo_update[key], dict):
@ -399,47 +347,45 @@ def update(_doc_cls=None, **update):

 def _geo_operator(field, op, value):
    """Helper to return the query for a given geo query."""
-    if op == "max_distance":
-        value = {"$maxDistance": value}
-    elif op == "min_distance":
-        value = {"$minDistance": value}
+    if op == 'max_distance':
+        value = {'$maxDistance': value}
+    elif op == 'min_distance':
+        value = {'$minDistance': value}
    elif field._geo_index == pymongo.GEO2D:
-        if op == "within_distance":
-            value = {"$within": {"$center": value}}
-        elif op == "within_spherical_distance":
-            value = {"$within": {"$centerSphere": value}}
-        elif op == "within_polygon":
-            value = {"$within": {"$polygon": value}}
-        elif op == "near":
-            value = {"$near": value}
-        elif op == "near_sphere":
-            value = {"$nearSphere": value}
-        elif op == "within_box":
-            value = {"$within": {"$box": value}}
+        if op == 'within_distance':
+            value = {'$within': {'$center': value}}
+        elif op == 'within_spherical_distance':
+            value = {'$within': {'$centerSphere': value}}
+        elif op == 'within_polygon':
+            value = {'$within': {'$polygon': value}}
+        elif op == 'near':
+            value = {'$near': value}
+        elif op == 'near_sphere':
+            value = {'$nearSphere': value}
+        elif op == 'within_box':
+            value = {'$within': {'$box': value}}
        else:
-            raise NotImplementedError(
-                'Geo method "%s" has not been ' "implemented for a GeoPointField" % op
-            )
+            raise NotImplementedError('Geo method "%s" has not been '
+                                      'implemented for a GeoPointField' % op)
    else:
-        if op == "geo_within":
-            value = {"$geoWithin": _infer_geometry(value)}
-        elif op == "geo_within_box":
-            value = {"$geoWithin": {"$box": value}}
-        elif op == "geo_within_polygon":
-            value = {"$geoWithin": {"$polygon": value}}
-        elif op == "geo_within_center":
-            value = {"$geoWithin": {"$center": value}}
-        elif op == "geo_within_sphere":
-            value = {"$geoWithin": {"$centerSphere": value}}
-        elif op == "geo_intersects":
-            value = {"$geoIntersects": _infer_geometry(value)}
-        elif op == "near":
-            value = {"$near": _infer_geometry(value)}
+        if op == 'geo_within':
+            value = {'$geoWithin': _infer_geometry(value)}
+        elif op == 'geo_within_box':
+            value = {'$geoWithin': {'$box': value}}
+        elif op == 'geo_within_polygon':
+            value = {'$geoWithin': {'$polygon': value}}
+        elif op == 'geo_within_center':
+            value = {'$geoWithin': {'$center': value}}
+        elif op == 'geo_within_sphere':
+            value = {'$geoWithin': {'$centerSphere': value}}
+        elif op == 'geo_intersects':
+            value = {'$geoIntersects': _infer_geometry(value)}
+        elif op == 'near':
+            value = {'$near': _infer_geometry(value)}
        else:
            raise NotImplementedError(
-                'Geo method "{}" has not been implemented for a {} '.format(
-                    op, field._name
-                )
+                'Geo method "%s" has not been implemented for a %s '
+                % (op, field._name)
            )
    return value

@ -449,58 +395,33 @@ def _infer_geometry(value):
    given value.
    """
    if isinstance(value, dict):
-        if "$geometry" in value:
+        if '$geometry' in value:
            return value
-        elif "coordinates" in value and "type" in value:
-            return {"$geometry": value}
-        raise InvalidQueryError(
-            "Invalid $geometry dictionary should have type and coordinates keys"
-        )
+        elif 'coordinates' in value and 'type' in value:
+            return {'$geometry': value}
+        raise InvalidQueryError('Invalid $geometry dictionary should have '
+                                'type and coordinates keys')
    elif isinstance(value, (list, set)):
        # TODO: shouldn't we test value[0][0][0][0] to see if it is MultiPolygon?
+        # TODO: should both TypeError and IndexError be alike interpreted?

        try:
            value[0][0][0]
-            return {"$geometry": {"type": "Polygon", "coordinates": value}}
+            return {'$geometry': {'type': 'Polygon', 'coordinates': value}}
        except (TypeError, IndexError):
            pass

        try:
            value[0][0]
-            return {"$geometry": {"type": "LineString", "coordinates": value}}
+            return {'$geometry': {'type': 'LineString', 'coordinates': value}}
        except (TypeError, IndexError):
            pass

        try:
            value[0]
-            return {"$geometry": {"type": "Point", "coordinates": value}}
+            return {'$geometry': {'type': 'Point', 'coordinates': value}}
        except (TypeError, IndexError):
            pass

-    raise InvalidQueryError(
-        "Invalid $geometry data. Can be either a "
-        "dictionary 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]
+    raise InvalidQueryError('Invalid $geometry data. Can be either a '
+                            'dictionary or (nested) lists of coordinate(s)')
--- a/mongoengine/queryset/visitor.py
+++ b/mongoengine/queryset/visitor.py
@ -1,26 +1,23 @@
 import copy
-import warnings

 from mongoengine.errors import InvalidQueryError
 from mongoengine.queryset import transform

-__all__ = ("Q", "QNode")
+__all__ = ('Q',)


-def warn_empty_is_deprecated():
-    msg = "'empty' property is deprecated in favour of using 'not bool(filter)'"
-    warnings.warn(msg, DeprecationWarning, stacklevel=2)
-
-
-class QNodeVisitor:
-    """Base visitor class for visiting Q-object nodes in a query tree."""
+class QNodeVisitor(object):
+    """Base visitor class for visiting Q-object nodes in a query tree.
+    """

    def visit_combination(self, combination):
-        """Called by QCombination objects."""
+        """Called by QCombination objects.
+        """
        return combination

    def visit_query(self, query):
-        """Called by (New)Q objects."""
+        """Called by (New)Q objects.
+        """
        return query


@ -46,7 +43,8 @@ class SimplificationVisitor(QNodeVisitor):
        return combination

    def _query_conjunction(self, queries):
-        """Merges query dicts - effectively &ing them together."""
+        """Merges query dicts - effectively &ing them together.
+        """
        query_ops = set()
        combined_query = {}
        for query in queries:
@ -71,16 +69,16 @@ class QueryCompilerVisitor(QNodeVisitor):
        self.document = document

    def visit_combination(self, combination):
-        operator = "$and"
+        operator = '$and'
        if combination.operation == combination.OR:
-            operator = "$or"
+            operator = '$or'
        return {operator: combination.children}

    def visit_query(self, query):
        return transform.query(self.document, **query.query)


-class QNode:
+class QNode(object):
    """Base class for nodes in query trees."""

    AND = 0
@ -98,19 +96,16 @@ class QNode:
        """Combine this node with another node into a QCombination
        object.
        """
-        # If the other Q() is empty, ignore it and just use `self`.
-        if not bool(other):
+        if getattr(other, 'empty', True):
            return self

-        # Or if this Q is empty, ignore it and just use `other`.
-        if not bool(self):
+        if self.empty:
            return other

        return QCombination(operation, [self, other])

    @property
    def empty(self):
-        warn_empty_is_deprecated()
        return False

    def __or__(self, other):
@ -136,13 +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 __bool__(self):
-        return bool(self.children)
-
    def accept(self, visitor):
        for i in range(len(self.children)):
            if isinstance(self.children[i], QNode):
@ -152,16 +140,8 @@ class QCombination(QNode):

    @property
    def empty(self):
-        warn_empty_is_deprecated()
        return not bool(self.children)

-    def __eq__(self, other):
-        return (
-            self.__class__ == other.__class__
-            and self.operation == other.operation
-            and self.children == other.children
-        )
-

 class Q(QNode):
    """A simple query object, used in a query tree to build up more complex
@ -171,19 +151,9 @@ class Q(QNode):
    def __init__(self, **query):
        self.query = query

-    def __repr__(self):
-        return "Q(**%s)" % repr(self.query)
-
-    def __bool__(self):
-        return bool(self.query)
-
-    def __eq__(self, other):
-        return self.__class__ == other.__class__ and self.query == other.query
-
    def accept(self, visitor):
        return visitor.visit_query(self)

    @property
    def empty(self):
-        warn_empty_is_deprecated()
        return not bool(self.query)
--- a/mongoengine/signals.py
+++ b/mongoengine/signals.py
@ -1,12 +1,5 @@
-__all__ = (
-    "pre_init",
-    "post_init",
-    "pre_save",
-    "pre_save_post_validation",
-    "post_save",
-    "pre_delete",
-    "post_delete",
-)
+__all__ = ('pre_init', 'post_init', 'pre_save', 'pre_save_post_validation',
+           'post_save', 'pre_delete', 'post_delete')

 signals_available = False
 try:
@ -14,12 +7,11 @@ try:

    signals_available = True
 except ImportError:
-
-    class Namespace:
+    class Namespace(object):
        def signal(self, name, doc=None):
            return _FakeSignal(name, doc)

-    class _FakeSignal:
+    class _FakeSignal(object):
        """If blinker is unavailable, create a fake class with the same
        interface that allows sending of signals but will fail with an
        error on anything else.  Instead of doing anything on send, it
@ -31,16 +23,13 @@ except ImportError:
            self.__doc__ = doc

        def _fail(self, *args, **kwargs):
-            raise RuntimeError(
-                "signalling support is unavailable "
-                "because the blinker library is "
-                "not installed."
-            )
+            raise RuntimeError('signalling support is unavailable '
+                               'because the blinker library is '
+                               'not installed.')

        send = lambda *a, **kw: None  # noqa
-        connect = (
-            disconnect
-        ) = has_receivers_for = receivers_for = temporarily_connected_to = _fail
+        connect = disconnect = has_receivers_for = receivers_for = \
+            temporarily_connected_to = _fail
        del _fail


@ -48,12 +37,12 @@ except ImportError:
 # not put signals in here.  Create your own namespace instead.
 _signals = Namespace()

-pre_init = _signals.signal("pre_init")
-post_init = _signals.signal("post_init")
-pre_save = _signals.signal("pre_save")
-pre_save_post_validation = _signals.signal("pre_save_post_validation")
-post_save = _signals.signal("post_save")
-pre_delete = _signals.signal("pre_delete")
-post_delete = _signals.signal("post_delete")
-pre_bulk_insert = _signals.signal("pre_bulk_insert")
-post_bulk_insert = _signals.signal("post_bulk_insert")
+pre_init = _signals.signal('pre_init')
+post_init = _signals.signal('post_init')
+pre_save = _signals.signal('pre_save')
+pre_save_post_validation = _signals.signal('pre_save_post_validation')
+post_save = _signals.signal('post_save')
+pre_delete = _signals.signal('pre_delete')
+post_delete = _signals.signal('post_delete')
+pre_bulk_insert = _signals.signal('pre_bulk_insert')
+post_bulk_insert = _signals.signal('post_bulk_insert')
--- a/python-mongoengine.spec
+++ b/python-mongoengine.spec
@ -51,4 +51,4 @@ rm -rf $RPM_BUILD_ROOT
 # %{python_sitearch}/*

 %changelog
-* See: http://docs.mongoengine.org/en/latest/changelog.html
+* See: http://docs.mongoengine.org/en/latest/changelog.html
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@ -1,7 +0,0 @@
-black
-flake8
-pre-commit
-pytest
-ipdb
-ipython
-tox
--- a/requirements.txt
+++ b/requirements.txt
@ -0,0 +1,5 @@
+nose
+pymongo>=2.7.1
+six==1.10.0
+flake8
+flake8-import-order
--- a/setup.cfg
+++ b/setup.cfg
@ -1,18 +1,11 @@
+[nosetests]
+verbosity=2
+detailed-errors=1
+tests=tests
+cover-package=mongoengine
+
 [flake8]
-ignore=E501,F403,F405,I201,I202,W504,W605,W503,B007
+ignore=E501,F401,F403,F405,I201
 exclude=build,dist,docs,venv,venv3,.tox,.eggs,tests
 max-complexity=47
-
-[tool:pytest]
-# Limits the discovery to tests directory
-# avoids that it runs for instance the benchmark
-testpaths = tests
-
-[isort]
-known_first_party = mongoengine,tests
-default_section = THIRDPARTY
-multi_line_output = 3
-include_trailing_comma = True
-combine_as_imports = True
-line_length = 70
-ensure_newline_before_comments = 1
+application-import-names=mongoengine,tests
--- a/setup.py
+++ b/setup.py
@ -1,20 +1,20 @@
 import os
 import sys
-
-from pkg_resources import normalize_path
 from setuptools import find_packages, setup
-from setuptools.command.test import test as TestCommand

 # Hack to silence atexit traceback in newer python versions
 try:
-    import multiprocessing  # noqa: F401
+    import multiprocessing
 except ImportError:
    pass

-DESCRIPTION = "MongoEngine is a Python Object-Document Mapper for working with MongoDB."
+DESCRIPTION = (
+    'MongoEngine is a Python Object-Document '
+    'Mapper for working with MongoDB.'
+)

 try:
-    with open("README.rst") as fin:
+    with open('README.rst') as fin:
        LONG_DESCRIPTION = fin.read()
 except Exception:
    LONG_DESCRIPTION = None
@ -24,125 +24,64 @@ def get_version(version_tuple):
    """Return the version tuple as a string, e.g. for (0, 10, 7),
    return '0.10.7'.
    """
-    return ".".join(map(str, version_tuple))
-
-
-class PyTest(TestCommand):
-    """Will force pytest to search for tests inside the build directory
-    for 2to3 converted code (used by tox), instead of the current directory.
-    Required as long as we need 2to3
-
-    Known Limitation: https://tox.readthedocs.io/en/latest/example/pytest.html#known-issues-and-limitations
-    Source: https://www.hackzine.org/python-testing-with-pytest-and-2to3-plus-tox-and-travis-ci.html
-    """
-
-    # https://pytest.readthedocs.io/en/2.7.3/goodpractises.html#integration-with-setuptools-test-commands
-    # Allows to provide pytest command argument through the test runner command `python setup.py test`
-    # e.g: `python setup.py test -a "-k=test"`
-    # This only works for 1 argument though
-    user_options = [("pytest-args=", "a", "Arguments to pass to py.test")]
-
-    def initialize_options(self):
-        TestCommand.initialize_options(self)
-        self.pytest_args = ""
-
-    def finalize_options(self):
-        TestCommand.finalize_options(self)
-        self.test_args = ["tests"]
-        self.test_suite = True
-
-    def run_tests(self):
-        # import here, cause outside the eggs aren't loaded
-        import pytest
-        from pkg_resources import _namespace_packages
-
-        # Purge modules under test from sys.modules. The test loader will
-        # re-import them from the build location. Required when 2to3 is used
-        # with namespace packages.
-        if sys.version_info >= (3,) and getattr(self.distribution, "use_2to3", False):
-            module = self.test_args[-1].split(".")[0]
-            if module in _namespace_packages:
-                del_modules = []
-                if module in sys.modules:
-                    del_modules.append(module)
-                module += "."
-                for name in sys.modules:
-                    if name.startswith(module):
-                        del_modules.append(name)
-                map(sys.modules.__delitem__, del_modules)
-
-            # Run on the build directory for 2to3-built code
-            # This will prevent the old 2.x code from being found
-            # by py.test discovery mechanism, that apparently
-            # ignores sys.path..
-            ei_cmd = self.get_finalized_command("egg_info")
-            self.test_args = [normalize_path(ei_cmd.egg_base)]
-
-        cmd_args = self.test_args + ([self.pytest_args] if self.pytest_args else [])
-        errno = pytest.main(cmd_args)
-        sys.exit(errno)
+    return '.'.join(map(str, version_tuple))


 # Dirty hack to get version number from monogengine/__init__.py - we can't
 # import it as it depends on PyMongo and PyMongo isn't installed until this
 # file is read
-init = os.path.join(os.path.dirname(__file__), "mongoengine", "__init__.py")
-version_line = list(filter(lambda l: l.startswith("VERSION"), open(init)))[0]
+init = os.path.join(os.path.dirname(__file__), 'mongoengine', '__init__.py')
+version_line = list(filter(lambda l: l.startswith('VERSION'), open(init)))[0]

-VERSION = get_version(eval(version_line.split("=")[-1]))
+VERSION = get_version(eval(version_line.split('=')[-1]))

 CLASSIFIERS = [
-    "Development Status :: 5 - Production/Stable",
-    "Intended Audience :: Developers",
-    "License :: OSI Approved :: MIT License",
-    "Operating System :: OS Independent",
-    "Programming Language :: Python",
+    'Development Status :: 4 - Beta',
+    'Intended Audience :: Developers',
+    'License :: OSI Approved :: MIT License',
+    'Operating System :: OS Independent',
+    'Programming Language :: Python',
+    "Programming Language :: Python :: 2",
+    "Programming Language :: Python :: 2.7",
    "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
-    "Programming Language :: Python :: 3.9",
-    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.3",
+    "Programming Language :: Python :: 3.4",
+    "Programming Language :: Python :: 3.5",
    "Programming Language :: Python :: Implementation :: CPython",
    "Programming Language :: Python :: Implementation :: PyPy",
-    "Topic :: Database",
-    "Topic :: Software Development :: Libraries :: Python Modules",
+    'Topic :: Database',
+    'Topic :: Software Development :: Libraries :: Python Modules',
 ]

 extra_opts = {
-    "packages": find_packages(exclude=["tests", "tests.*"]),
-    "tests_require": [
-        "pytest",
-        "pytest-cov",
-        "coverage",
-        "blinker",
-        "Pillow>=7.0.0",
-    ],
+    'packages': find_packages(exclude=['tests', 'tests.*']),
+    'tests_require': ['nose', 'coverage==4.2', 'blinker', 'Pillow>=2.0.0']
 }
-
-if "test" in sys.argv:
-    extra_opts["packages"] = find_packages()
-    extra_opts["package_data"] = {
-        "tests": ["fields/mongoengine.png", "fields/mongodb_leaf.png"]
-    }
+if sys.version_info[0] == 3:
+    extra_opts['use_2to3'] = True
+    if 'test' in sys.argv or 'nosetests' in sys.argv:
+        extra_opts['packages'] = find_packages()
+        extra_opts['package_data'] = {
+            'tests': ['fields/mongoengine.png', 'fields/mongodb_leaf.png']}
+else:
+    extra_opts['tests_require'] += ['python-dateutil']

 setup(
-    name="mongoengine",
+    name='mongoengine',
    version=VERSION,
-    author="Harry Marr",
-    author_email="harry.marr@gmail.com",
-    maintainer="Stefan Wojcik",
-    maintainer_email="wojcikstefan@gmail.com",
-    url="http://mongoengine.org/",
-    download_url="https://github.com/MongoEngine/mongoengine/tarball/master",
-    license="MIT",
+    author='Harry Marr',
+    author_email='harry.marr@{nospam}gmail.com',
+    maintainer="Ross Lawley",
+    maintainer_email="ross.lawley@{nospam}gmail.com",
+    url='http://mongoengine.org/',
+    download_url='https://github.com/MongoEngine/mongoengine/tarball/master',
+    license='MIT',
    include_package_data=True,
    description=DESCRIPTION,
    long_description=LONG_DESCRIPTION,
-    platforms=["any"],
+    platforms=['any'],
    classifiers=CLASSIFIERS,
-    python_requires=">=3.6",
-    install_requires=["pymongo>=3.4, <4.0"],
-    cmdclass={"test": PyTest},
+    install_requires=['pymongo>=2.7.1', 'six'],
+    test_suite='nose.collector',
    **extra_opts
 )
--- a/tests/init.py
+++ b/tests/init.py
@ -0,0 +1,4 @@
+from all_warnings import AllWarnings
+from document import *
+from queryset import *
+from fields import *
--- a/tests/all_warnings/init.py
+++ b/tests/all_warnings/init.py
@ -0,0 +1,42 @@
+"""
+This test has been put into a module.  This is because it tests warnings that
+only get triggered on first hit.  This way we can ensure its imported into the
+top level and called first by the test suite.
+"""
+import unittest
+import warnings
+
+from mongoengine import *
+
+
+__all__ = ('AllWarnings', )
+
+
+class AllWarnings(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.warning_list = []
+        self.showwarning_default = warnings.showwarning
+        warnings.showwarning = self.append_to_warning_list
+
+    def append_to_warning_list(self, message, category, *args):
+        self.warning_list.append({"message": message,
+                                  "category": category})
+
+    def tearDown(self):
+        # restore default handling of warnings
+        warnings.showwarning = self.showwarning_default
+
+    def test_document_collection_syntax_warning(self):
+
+        class NonAbstractBase(Document):
+            meta = {'allow_inheritance': True}
+
+        class InheritedDocumentFailTest(NonAbstractBase):
+            meta = {'collection': 'fail'}
+
+        warning = self.warning_list[0]
+        self.assertEqual(SyntaxWarning, warning["category"])
+        self.assertEqual('non_abstract_base',
+                         InheritedDocumentFailTest._get_collection_name())
--- a/tests/all_warnings/test_warnings.py
+++ b/tests/all_warnings/test_warnings.py
@ -1,35 +0,0 @@
-"""
-This test has been put into a module.  This is because it tests warnings that
-only get triggered on first hit.  This way we can ensure its imported into the
-top level and called first by the test suite.
-"""
-import unittest
-import warnings
-
-from mongoengine import *
-
-
-class TestAllWarnings(unittest.TestCase):
-    def setUp(self):
-        connect(db="mongoenginetest")
-        self.warning_list = []
-        self.showwarning_default = warnings.showwarning
-        warnings.showwarning = self.append_to_warning_list
-
-    def append_to_warning_list(self, message, category, *args):
-        self.warning_list.append({"message": message, "category": category})
-
-    def tearDown(self):
-        # restore default handling of warnings
-        warnings.showwarning = self.showwarning_default
-
-    def test_document_collection_syntax_warning(self):
-        class NonAbstractBase(Document):
-            meta = {"allow_inheritance": True}
-
-        class InheritedDocumentFailTest(NonAbstractBase):
-            meta = {"collection": "fail"}
-
-        warning = self.warning_list[0]
-        assert SyntaxWarning == warning["category"]
-        assert "non_abstract_base" == InheritedDocumentFailTest._get_collection_name()
--- a/tests/document/init.py
+++ b/tests/document/init.py
@ -0,0 +1,13 @@
+import unittest
+
+from class_methods import *
+from delta import *
+from dynamic import *
+from indexes import *
+from inheritance import *
+from instance import *
+from json_serialisation import *
+from validation import *
+
+if __name__ == '__main__':
+    unittest.main()
--- a/tests/document/class_methods.py
+++ b/tests/document/class_methods.py
@ -0,0 +1,350 @@
+# -*- coding: utf-8 -*-
+import unittest
+
+from mongoengine import *
+
+from mongoengine.queryset import NULLIFY, PULL
+from mongoengine.connection import get_db
+
+__all__ = ("ClassMethodsTest", )
+
+
+class ClassMethodsTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+            non_field = True
+
+            meta = {"allow_inheritance": True}
+
+        self.Person = Person
+
+    def tearDown(self):
+        for collection in self.db.collection_names():
+            if 'system.' in collection:
+                continue
+            self.db.drop_collection(collection)
+
+    def test_definition(self):
+        """Ensure that document may be defined using fields.
+        """
+        self.assertEqual(['_cls', 'age', 'id', 'name'],
+                         sorted(self.Person._fields.keys()))
+        self.assertEqual(["IntField", "ObjectIdField", "StringField", "StringField"],
+                        sorted([x.__class__.__name__ for x in
+                                self.Person._fields.values()]))
+
+    def test_get_db(self):
+        """Ensure that get_db returns the expected db.
+        """
+        db = self.Person._get_db()
+        self.assertEqual(self.db, db)
+
+    def test_get_collection_name(self):
+        """Ensure that get_collection_name returns the expected collection
+        name.
+        """
+        collection_name = 'person'
+        self.assertEqual(collection_name, self.Person._get_collection_name())
+
+    def test_get_collection(self):
+        """Ensure that get_collection returns the expected collection.
+        """
+        collection_name = 'person'
+        collection = self.Person._get_collection()
+        self.assertEqual(self.db[collection_name], collection)
+
+    def test_drop_collection(self):
+        """Ensure that the collection may be dropped from the database.
+        """
+        collection_name = 'person'
+        self.Person(name='Test').save()
+        self.assertTrue(collection_name in self.db.collection_names())
+
+        self.Person.drop_collection()
+        self.assertFalse(collection_name in self.db.collection_names())
+
+    def test_register_delete_rule(self):
+        """Ensure that register delete rule adds a delete rule to the document
+        meta.
+        """
+        class Job(Document):
+            employee = ReferenceField(self.Person)
+
+        self.assertEqual(self.Person._meta.get('delete_rules'), None)
+
+        self.Person.register_delete_rule(Job, 'employee', NULLIFY)
+        self.assertEqual(self.Person._meta['delete_rules'],
+                         {(Job, 'employee'): NULLIFY})
+
+    def test_compare_indexes(self):
+        """ Ensure that the indexes are properly created and that
+        compare_indexes identifies the missing/extra indexes
+        """
+
+        class BlogPost(Document):
+            author = StringField()
+            title = StringField()
+            description = StringField()
+            tags = StringField()
+
+            meta = {
+                'indexes': [('author', 'title')]
+            }
+
+        BlogPost.drop_collection()
+
+        BlogPost.ensure_indexes()
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+
+        BlogPost.ensure_index(['author', 'description'])
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [[('author', 1), ('description', 1)]] })
+
+        BlogPost._get_collection().drop_index('author_1_description_1')
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+
+        BlogPost._get_collection().drop_index('author_1_title_1')
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [[('author', 1), ('title', 1)]], 'extra': [] })
+
+    def test_compare_indexes_inheritance(self):
+        """ Ensure that the indexes are properly created and that
+        compare_indexes identifies the missing/extra indexes for subclassed
+        documents (_cls included)
+        """
+
+        class BlogPost(Document):
+            author = StringField()
+            title = StringField()
+            description = StringField()
+
+            meta = {
+                'allow_inheritance': True
+            }
+
+        class BlogPostWithTags(BlogPost):
+            tags = StringField()
+            tag_list = ListField(StringField())
+
+            meta = {
+                'indexes': [('author', 'tags')]
+            }
+
+        BlogPost.drop_collection()
+
+        BlogPost.ensure_indexes()
+        BlogPostWithTags.ensure_indexes()
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+
+        BlogPostWithTags.ensure_index(['author', 'tag_list'])
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [[('_cls', 1), ('author', 1), ('tag_list', 1)]] })
+
+        BlogPostWithTags._get_collection().drop_index('_cls_1_author_1_tag_list_1')
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+
+        BlogPostWithTags._get_collection().drop_index('_cls_1_author_1_tags_1')
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [[('_cls', 1), ('author', 1), ('tags', 1)]], 'extra': [] })
+
+    def test_compare_indexes_multiple_subclasses(self):
+        """ Ensure that compare_indexes behaves correctly if called from a
+        class, which base class has multiple subclasses
+        """
+
+        class BlogPost(Document):
+            author = StringField()
+            title = StringField()
+            description = StringField()
+
+            meta = {
+                'allow_inheritance': True
+            }
+
+        class BlogPostWithTags(BlogPost):
+            tags = StringField()
+            tag_list = ListField(StringField())
+
+            meta = {
+                'indexes': [('author', 'tags')]
+            }
+
+        class BlogPostWithCustomField(BlogPost):
+            custom = DictField()
+
+            meta = {
+                'indexes': [('author', 'custom')]
+            }
+
+        BlogPost.ensure_indexes()
+        BlogPostWithTags.ensure_indexes()
+        BlogPostWithCustomField.ensure_indexes()
+
+        self.assertEqual(BlogPost.compare_indexes(), { 'missing': [], 'extra': [] })
+        self.assertEqual(BlogPostWithTags.compare_indexes(), { 'missing': [], 'extra': [] })
+        self.assertEqual(BlogPostWithCustomField.compare_indexes(), { 'missing': [], 'extra': [] })
+
+    def test_list_indexes_inheritance(self):
+        """ ensure that all of the indexes are listed regardless of the super-
+        or sub-class that we call it from
+        """
+
+        class BlogPost(Document):
+            author = StringField()
+            title = StringField()
+            description = StringField()
+
+            meta = {
+                'allow_inheritance': True
+            }
+
+        class BlogPostWithTags(BlogPost):
+            tags = StringField()
+
+            meta = {
+                'indexes': [('author', 'tags')]
+            }
+
+        class BlogPostWithTagsAndExtraText(BlogPostWithTags):
+            extra_text = StringField()
+
+            meta = {
+                'indexes': [('author', 'tags', 'extra_text')]
+            }
+
+        BlogPost.drop_collection()
+
+        BlogPost.ensure_indexes()
+        BlogPostWithTags.ensure_indexes()
+        BlogPostWithTagsAndExtraText.ensure_indexes()
+
+        self.assertEqual(BlogPost.list_indexes(),
+                         BlogPostWithTags.list_indexes())
+        self.assertEqual(BlogPost.list_indexes(),
+                         BlogPostWithTagsAndExtraText.list_indexes())
+        self.assertEqual(BlogPost.list_indexes(),
+                         [[('_cls', 1), ('author', 1), ('tags', 1)],
+                         [('_cls', 1), ('author', 1), ('tags', 1), ('extra_text', 1)],
+                         [(u'_id', 1)], [('_cls', 1)]])
+
+    def test_register_delete_rule_inherited(self):
+
+        class Vaccine(Document):
+            name = StringField(required=True)
+
+            meta = {"indexes": ["name"]}
+
+        class Animal(Document):
+            family = StringField(required=True)
+            vaccine_made = ListField(ReferenceField("Vaccine", reverse_delete_rule=PULL))
+
+            meta = {"allow_inheritance": True, "indexes": ["family"]}
+
+        class Cat(Animal):
+            name = StringField(required=True)
+
+        self.assertEqual(Vaccine._meta['delete_rules'][(Animal, 'vaccine_made')], PULL)
+        self.assertEqual(Vaccine._meta['delete_rules'][(Cat, 'vaccine_made')], PULL)
+
+    def test_collection_naming(self):
+        """Ensure that a collection with a specified name may be used.
+        """
+
+        class DefaultNamingTest(Document):
+            pass
+        self.assertEqual('default_naming_test',
+                         DefaultNamingTest._get_collection_name())
+
+        class CustomNamingTest(Document):
+            meta = {'collection': 'pimp_my_collection'}
+
+        self.assertEqual('pimp_my_collection',
+                         CustomNamingTest._get_collection_name())
+
+        class DynamicNamingTest(Document):
+            meta = {'collection': lambda c: "DYNAMO"}
+        self.assertEqual('DYNAMO', DynamicNamingTest._get_collection_name())
+
+        # Use Abstract class to handle backwards compatibility
+        class BaseDocument(Document):
+            meta = {
+                'abstract': True,
+                'collection': lambda c: c.__name__.lower()
+            }
+
+        class OldNamingConvention(BaseDocument):
+            pass
+        self.assertEqual('oldnamingconvention',
+                         OldNamingConvention._get_collection_name())
+
+        class InheritedAbstractNamingTest(BaseDocument):
+            meta = {'collection': 'wibble'}
+        self.assertEqual('wibble',
+                         InheritedAbstractNamingTest._get_collection_name())
+
+        # Mixin tests
+        class BaseMixin(object):
+            meta = {
+                'collection': lambda c: c.__name__.lower()
+            }
+
+        class OldMixinNamingConvention(Document, BaseMixin):
+            pass
+        self.assertEqual('oldmixinnamingconvention',
+                          OldMixinNamingConvention._get_collection_name())
+
+        class BaseMixin(object):
+            meta = {
+                'collection': lambda c: c.__name__.lower()
+            }
+
+        class BaseDocument(Document, BaseMixin):
+            meta = {'allow_inheritance': True}
+
+        class MyDocument(BaseDocument):
+            pass
+
+        self.assertEqual('basedocument', MyDocument._get_collection_name())
+
+    def test_custom_collection_name_operations(self):
+        """Ensure that a collection with a specified name is used as expected.
+        """
+        collection_name = 'personCollTest'
+
+        class Person(Document):
+            name = StringField()
+            meta = {'collection': collection_name}
+
+        Person(name="Test User").save()
+        self.assertTrue(collection_name in self.db.collection_names())
+
+        user_obj = self.db[collection_name].find_one()
+        self.assertEqual(user_obj['name'], "Test User")
+
+        user_obj = Person.objects[0]
+        self.assertEqual(user_obj.name, "Test User")
+
+        Person.drop_collection()
+        self.assertFalse(collection_name in self.db.collection_names())
+
+    def test_collection_name_and_primary(self):
+        """Ensure that a collection with a specified name may be used.
+        """
+
+        class Person(Document):
+            name = StringField(primary_key=True)
+            meta = {'collection': 'app'}
+
+        Person(name="Test User").save()
+
+        user_obj = Person.objects.first()
+        self.assertEqual(user_obj.name, "Test User")
+
+        Person.drop_collection()
+
+
+if __name__ == '__main__':
+    unittest.main()
--- a/tests/document/delta.py
+++ b/tests/document/delta.py
@ -0,0 +1,867 @@
+# -*- coding: utf-8 -*-
+import unittest
+
+from bson import SON
+from mongoengine import *
+from mongoengine.connection import get_db
+
+__all__ = ("DeltaTest",)
+
+
+class DeltaTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+            non_field = True
+
+            meta = {"allow_inheritance": True}
+
+        self.Person = Person
+
+    def tearDown(self):
+        for collection in self.db.collection_names():
+            if 'system.' in collection:
+                continue
+            self.db.drop_collection(collection)
+
+    def test_delta(self):
+        self.delta(Document)
+        self.delta(DynamicDocument)
+
+    def delta(self, DocClass):
+
+        class Doc(DocClass):
+            string_field = StringField()
+            int_field = IntField()
+            dict_field = DictField()
+            list_field = ListField()
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        doc.string_field = 'hello'
+        self.assertEqual(doc._get_changed_fields(), ['string_field'])
+        self.assertEqual(doc._delta(), ({'string_field': 'hello'}, {}))
+
+        doc._changed_fields = []
+        doc.int_field = 1
+        self.assertEqual(doc._get_changed_fields(), ['int_field'])
+        self.assertEqual(doc._delta(), ({'int_field': 1}, {}))
+
+        doc._changed_fields = []
+        dict_value = {'hello': 'world', 'ping': 'pong'}
+        doc.dict_field = dict_value
+        self.assertEqual(doc._get_changed_fields(), ['dict_field'])
+        self.assertEqual(doc._delta(), ({'dict_field': dict_value}, {}))
+
+        doc._changed_fields = []
+        list_value = ['1', 2, {'hello': 'world'}]
+        doc.list_field = list_value
+        self.assertEqual(doc._get_changed_fields(), ['list_field'])
+        self.assertEqual(doc._delta(), ({'list_field': list_value}, {}))
+
+        # Test unsetting
+        doc._changed_fields = []
+        doc.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(), ['dict_field'])
+        self.assertEqual(doc._delta(), ({}, {'dict_field': 1}))
+
+        doc._changed_fields = []
+        doc.list_field = []
+        self.assertEqual(doc._get_changed_fields(), ['list_field'])
+        self.assertEqual(doc._delta(), ({}, {'list_field': 1}))
+
+    def test_delta_recursive(self):
+        self.delta_recursive(Document, EmbeddedDocument)
+        self.delta_recursive(DynamicDocument, EmbeddedDocument)
+        self.delta_recursive(Document, DynamicEmbeddedDocument)
+        self.delta_recursive(DynamicDocument, DynamicEmbeddedDocument)
+
+    def delta_recursive(self, DocClass, EmbeddedClass):
+
+        class Embedded(EmbeddedClass):
+            id = StringField()
+            string_field = StringField()
+            int_field = IntField()
+            dict_field = DictField()
+            list_field = ListField()
+
+        class Doc(DocClass):
+            string_field = StringField()
+            int_field = IntField()
+            dict_field = DictField()
+            list_field = ListField()
+            embedded_field = EmbeddedDocumentField(Embedded)
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        embedded_1 = Embedded()
+        embedded_1.id = "010101"
+        embedded_1.string_field = 'hello'
+        embedded_1.int_field = 1
+        embedded_1.dict_field = {'hello': 'world'}
+        embedded_1.list_field = ['1', 2, {'hello': 'world'}]
+        doc.embedded_field = embedded_1
+
+        self.assertEqual(doc._get_changed_fields(), ['embedded_field'])
+
+        embedded_delta = {
+            'id': "010101",
+            'string_field': 'hello',
+            'int_field': 1,
+            'dict_field': {'hello': 'world'},
+            'list_field': ['1', 2, {'hello': 'world'}]
+        }
+        self.assertEqual(doc.embedded_field._delta(), (embedded_delta, {}))
+        self.assertEqual(doc._delta(),
+                         ({'embedded_field': embedded_delta}, {}))
+
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.embedded_field.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.dict_field'])
+        self.assertEqual(doc.embedded_field._delta(), ({}, {'dict_field': 1}))
+        self.assertEqual(doc._delta(), ({}, {'embedded_field.dict_field': 1}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.dict_field, {})
+
+        doc.embedded_field.list_field = []
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.list_field'])
+        self.assertEqual(doc.embedded_field._delta(), ({}, {'list_field': 1}))
+        self.assertEqual(doc._delta(), ({}, {'embedded_field.list_field': 1}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field, [])
+
+        embedded_2 = Embedded()
+        embedded_2.string_field = 'hello'
+        embedded_2.int_field = 1
+        embedded_2.dict_field = {'hello': 'world'}
+        embedded_2.list_field = ['1', 2, {'hello': 'world'}]
+
+        doc.embedded_field.list_field = ['1', 2, embedded_2]
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.list_field'])
+
+        self.assertEqual(doc.embedded_field._delta(), ({
+            'list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'string_field': 'hello',
+                'dict_field': {'hello': 'world'},
+                'int_field': 1,
+                'list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+
+        self.assertEqual(doc._delta(), ({
+            'embedded_field.list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'string_field': 'hello',
+                'dict_field': {'hello': 'world'},
+                'int_field': 1,
+                'list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        self.assertEqual(doc.embedded_field.list_field[0], '1')
+        self.assertEqual(doc.embedded_field.list_field[1], 2)
+        for k in doc.embedded_field.list_field[2]._fields:
+            self.assertEqual(doc.embedded_field.list_field[2][k],
+                             embedded_2[k])
+
+        doc.embedded_field.list_field[2].string_field = 'world'
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.list_field.2.string_field'])
+        self.assertEqual(doc.embedded_field._delta(),
+                         ({'list_field.2.string_field': 'world'}, {}))
+        self.assertEqual(doc._delta(),
+                         ({'embedded_field.list_field.2.string_field': 'world'}, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].string_field,
+                         'world')
+
+        # Test multiple assignments
+        doc.embedded_field.list_field[2].string_field = 'hello world'
+        doc.embedded_field.list_field[2] = doc.embedded_field.list_field[2]
+        self.assertEqual(doc._get_changed_fields(),
+                         ['embedded_field.list_field.2'])
+        self.assertEqual(doc.embedded_field._delta(), ({'list_field.2': {
+                '_cls': 'Embedded',
+                'string_field': 'hello world',
+                'int_field': 1,
+                'list_field': ['1', 2, {'hello': 'world'}],
+                'dict_field': {'hello': 'world'}}
+            }, {}))
+        self.assertEqual(doc._delta(), ({'embedded_field.list_field.2': {
+                '_cls': 'Embedded',
+                'string_field': 'hello world',
+                'int_field': 1,
+                'list_field': ['1', 2, {'hello': 'world'}],
+                'dict_field': {'hello': 'world'}}
+            }, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].string_field,
+                         'hello world')
+
+        # Test list native methods
+        doc.embedded_field.list_field[2].list_field.pop(0)
+        self.assertEqual(doc._delta(),
+                         ({'embedded_field.list_field.2.list_field':
+                          [2, {'hello': 'world'}]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.embedded_field.list_field[2].list_field.append(1)
+        self.assertEqual(doc._delta(),
+                         ({'embedded_field.list_field.2.list_field':
+                          [2, {'hello': 'world'}, 1]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].list_field,
+                         [2, {'hello': 'world'}, 1])
+
+        doc.embedded_field.list_field[2].list_field.sort(key=str)
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].list_field,
+                         [1, 2, {'hello': 'world'}])
+
+        del doc.embedded_field.list_field[2].list_field[2]['hello']
+        self.assertEqual(doc._delta(),
+                         ({}, {'embedded_field.list_field.2.list_field.2.hello': 1}))
+        doc.save()
+        doc = doc.reload(10)
+
+        del doc.embedded_field.list_field[2].list_field
+        self.assertEqual(doc._delta(),
+                         ({}, {'embedded_field.list_field.2.list_field': 1}))
+
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.dict_field['Embedded'] = embedded_1
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.dict_field['Embedded'].string_field = 'Hello World'
+        self.assertEqual(doc._get_changed_fields(),
+                         ['dict_field.Embedded.string_field'])
+        self.assertEqual(doc._delta(),
+                         ({'dict_field.Embedded.string_field': 'Hello World'}, {}))
+
+    def test_circular_reference_deltas(self):
+        self.circular_reference_deltas(Document, Document)
+        self.circular_reference_deltas(Document, DynamicDocument)
+        self.circular_reference_deltas(DynamicDocument, Document)
+        self.circular_reference_deltas(DynamicDocument, DynamicDocument)
+
+    def circular_reference_deltas(self, DocClass1, DocClass2):
+
+        class Person(DocClass1):
+            name = StringField()
+            owns = ListField(ReferenceField('Organization'))
+
+        class Organization(DocClass2):
+            name = StringField()
+            owner = ReferenceField('Person')
+
+        Person.drop_collection()
+        Organization.drop_collection()
+
+        person = Person(name="owner").save()
+        organization = Organization(name="company").save()
+
+        person.owns.append(organization)
+        organization.owner = person
+
+        person.save()
+        organization.save()
+
+        p = Person.objects[0].select_related()
+        o = Organization.objects.first()
+        self.assertEqual(p.owns[0], o)
+        self.assertEqual(o.owner, p)
+
+    def test_circular_reference_deltas_2(self):
+        self.circular_reference_deltas_2(Document, Document)
+        self.circular_reference_deltas_2(Document, DynamicDocument)
+        self.circular_reference_deltas_2(DynamicDocument, Document)
+        self.circular_reference_deltas_2(DynamicDocument, DynamicDocument)
+
+    def circular_reference_deltas_2(self, DocClass1, DocClass2, dbref=True):
+
+        class Person(DocClass1):
+            name = StringField()
+            owns = ListField(ReferenceField('Organization', dbref=dbref))
+            employer = ReferenceField('Organization', dbref=dbref)
+
+        class Organization(DocClass2):
+            name = StringField()
+            owner = ReferenceField('Person', dbref=dbref)
+            employees = ListField(ReferenceField('Person', dbref=dbref))
+
+        Person.drop_collection()
+        Organization.drop_collection()
+
+        person = Person(name="owner").save()
+        employee = Person(name="employee").save()
+        organization = Organization(name="company").save()
+
+        person.owns.append(organization)
+        organization.owner = person
+
+        organization.employees.append(employee)
+        employee.employer = organization
+
+        person.save()
+        organization.save()
+        employee.save()
+
+        p = Person.objects.get(name="owner")
+        e = Person.objects.get(name="employee")
+        o = Organization.objects.first()
+
+        self.assertEqual(p.owns[0], o)
+        self.assertEqual(o.owner, p)
+        self.assertEqual(e.employer, o)
+
+        return person, organization, employee
+
+    def test_delta_db_field(self):
+        self.delta_db_field(Document)
+        self.delta_db_field(DynamicDocument)
+
+    def delta_db_field(self, DocClass):
+
+        class Doc(DocClass):
+            string_field = StringField(db_field='db_string_field')
+            int_field = IntField(db_field='db_int_field')
+            dict_field = DictField(db_field='db_dict_field')
+            list_field = ListField(db_field='db_list_field')
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        doc.string_field = 'hello'
+        self.assertEqual(doc._get_changed_fields(), ['db_string_field'])
+        self.assertEqual(doc._delta(), ({'db_string_field': 'hello'}, {}))
+
+        doc._changed_fields = []
+        doc.int_field = 1
+        self.assertEqual(doc._get_changed_fields(), ['db_int_field'])
+        self.assertEqual(doc._delta(), ({'db_int_field': 1}, {}))
+
+        doc._changed_fields = []
+        dict_value = {'hello': 'world', 'ping': 'pong'}
+        doc.dict_field = dict_value
+        self.assertEqual(doc._get_changed_fields(), ['db_dict_field'])
+        self.assertEqual(doc._delta(), ({'db_dict_field': dict_value}, {}))
+
+        doc._changed_fields = []
+        list_value = ['1', 2, {'hello': 'world'}]
+        doc.list_field = list_value
+        self.assertEqual(doc._get_changed_fields(), ['db_list_field'])
+        self.assertEqual(doc._delta(), ({'db_list_field': list_value}, {}))
+
+        # Test unsetting
+        doc._changed_fields = []
+        doc.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(), ['db_dict_field'])
+        self.assertEqual(doc._delta(), ({}, {'db_dict_field': 1}))
+
+        doc._changed_fields = []
+        doc.list_field = []
+        self.assertEqual(doc._get_changed_fields(), ['db_list_field'])
+        self.assertEqual(doc._delta(), ({}, {'db_list_field': 1}))
+
+        # Test it saves that data
+        doc = Doc()
+        doc.save()
+
+        doc.string_field = 'hello'
+        doc.int_field = 1
+        doc.dict_field = {'hello': 'world'}
+        doc.list_field = ['1', 2, {'hello': 'world'}]
+        doc.save()
+        doc = doc.reload(10)
+
+        self.assertEqual(doc.string_field, 'hello')
+        self.assertEqual(doc.int_field, 1)
+        self.assertEqual(doc.dict_field, {'hello': 'world'})
+        self.assertEqual(doc.list_field, ['1', 2, {'hello': 'world'}])
+
+    def test_delta_recursive_db_field(self):
+        self.delta_recursive_db_field(Document, EmbeddedDocument)
+        self.delta_recursive_db_field(Document, DynamicEmbeddedDocument)
+        self.delta_recursive_db_field(DynamicDocument, EmbeddedDocument)
+        self.delta_recursive_db_field(DynamicDocument, DynamicEmbeddedDocument)
+
+    def delta_recursive_db_field(self, DocClass, EmbeddedClass):
+
+        class Embedded(EmbeddedClass):
+            string_field = StringField(db_field='db_string_field')
+            int_field = IntField(db_field='db_int_field')
+            dict_field = DictField(db_field='db_dict_field')
+            list_field = ListField(db_field='db_list_field')
+
+        class Doc(DocClass):
+            string_field = StringField(db_field='db_string_field')
+            int_field = IntField(db_field='db_int_field')
+            dict_field = DictField(db_field='db_dict_field')
+            list_field = ListField(db_field='db_list_field')
+            embedded_field = EmbeddedDocumentField(Embedded,
+                                    db_field='db_embedded_field')
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        embedded_1 = Embedded()
+        embedded_1.string_field = 'hello'
+        embedded_1.int_field = 1
+        embedded_1.dict_field = {'hello': 'world'}
+        embedded_1.list_field = ['1', 2, {'hello': 'world'}]
+        doc.embedded_field = embedded_1
+
+        self.assertEqual(doc._get_changed_fields(), ['db_embedded_field'])
+
+        embedded_delta = {
+            'db_string_field': 'hello',
+            'db_int_field': 1,
+            'db_dict_field': {'hello': 'world'},
+            'db_list_field': ['1', 2, {'hello': 'world'}]
+        }
+        self.assertEqual(doc.embedded_field._delta(), (embedded_delta, {}))
+        self.assertEqual(doc._delta(),
+            ({'db_embedded_field': embedded_delta}, {}))
+
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.embedded_field.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_dict_field'])
+        self.assertEqual(doc.embedded_field._delta(),
+            ({}, {'db_dict_field': 1}))
+        self.assertEqual(doc._delta(),
+            ({}, {'db_embedded_field.db_dict_field': 1}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.dict_field, {})
+
+        doc.embedded_field.list_field = []
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_list_field'])
+        self.assertEqual(doc.embedded_field._delta(),
+            ({}, {'db_list_field': 1}))
+        self.assertEqual(doc._delta(),
+            ({}, {'db_embedded_field.db_list_field': 1}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field, [])
+
+        embedded_2 = Embedded()
+        embedded_2.string_field = 'hello'
+        embedded_2.int_field = 1
+        embedded_2.dict_field = {'hello': 'world'}
+        embedded_2.list_field = ['1', 2, {'hello': 'world'}]
+
+        doc.embedded_field.list_field = ['1', 2, embedded_2]
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_list_field'])
+        self.assertEqual(doc.embedded_field._delta(), ({
+            'db_list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'db_string_field': 'hello',
+                'db_dict_field': {'hello': 'world'},
+                'db_int_field': 1,
+                'db_list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+
+        self.assertEqual(doc._delta(), ({
+            'db_embedded_field.db_list_field': ['1', 2, {
+                '_cls': 'Embedded',
+                'db_string_field': 'hello',
+                'db_dict_field': {'hello': 'world'},
+                'db_int_field': 1,
+                'db_list_field': ['1', 2, {'hello': 'world'}],
+            }]
+        }, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        self.assertEqual(doc.embedded_field.list_field[0], '1')
+        self.assertEqual(doc.embedded_field.list_field[1], 2)
+        for k in doc.embedded_field.list_field[2]._fields:
+            self.assertEqual(doc.embedded_field.list_field[2][k],
+                             embedded_2[k])
+
+        doc.embedded_field.list_field[2].string_field = 'world'
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_list_field.2.db_string_field'])
+        self.assertEqual(doc.embedded_field._delta(),
+            ({'db_list_field.2.db_string_field': 'world'}, {}))
+        self.assertEqual(doc._delta(),
+            ({'db_embedded_field.db_list_field.2.db_string_field': 'world'},
+             {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].string_field,
+                        'world')
+
+        # Test multiple assignments
+        doc.embedded_field.list_field[2].string_field = 'hello world'
+        doc.embedded_field.list_field[2] = doc.embedded_field.list_field[2]
+        self.assertEqual(doc._get_changed_fields(),
+            ['db_embedded_field.db_list_field.2'])
+        self.assertEqual(doc.embedded_field._delta(), ({'db_list_field.2': {
+            '_cls': 'Embedded',
+            'db_string_field': 'hello world',
+            'db_int_field': 1,
+            'db_list_field': ['1', 2, {'hello': 'world'}],
+            'db_dict_field': {'hello': 'world'}}}, {}))
+        self.assertEqual(doc._delta(), ({
+            'db_embedded_field.db_list_field.2': {
+                '_cls': 'Embedded',
+                'db_string_field': 'hello world',
+                'db_int_field': 1,
+                'db_list_field': ['1', 2, {'hello': 'world'}],
+                'db_dict_field': {'hello': 'world'}}
+            }, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].string_field,
+                        'hello world')
+
+        # Test list native methods
+        doc.embedded_field.list_field[2].list_field.pop(0)
+        self.assertEqual(doc._delta(),
+            ({'db_embedded_field.db_list_field.2.db_list_field':
+                [2, {'hello': 'world'}]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+
+        doc.embedded_field.list_field[2].list_field.append(1)
+        self.assertEqual(doc._delta(),
+            ({'db_embedded_field.db_list_field.2.db_list_field':
+                [2, {'hello': 'world'}, 1]}, {}))
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].list_field,
+            [2, {'hello': 'world'}, 1])
+
+        doc.embedded_field.list_field[2].list_field.sort(key=str)
+        doc.save()
+        doc = doc.reload(10)
+        self.assertEqual(doc.embedded_field.list_field[2].list_field,
+            [1, 2, {'hello': 'world'}])
+
+        del doc.embedded_field.list_field[2].list_field[2]['hello']
+        self.assertEqual(doc._delta(),
+            ({}, {'db_embedded_field.db_list_field.2.db_list_field.2.hello': 1}))
+        doc.save()
+        doc = doc.reload(10)
+
+        del doc.embedded_field.list_field[2].list_field
+        self.assertEqual(doc._delta(), ({},
+            {'db_embedded_field.db_list_field.2.db_list_field': 1}))
+
+    def test_delta_for_dynamic_documents(self):
+        class Person(DynamicDocument):
+            name = StringField()
+            meta = {'allow_inheritance': True}
+
+        Person.drop_collection()
+
+        p = Person(name="James", age=34)
+        self.assertEqual(p._delta(), (
+            SON([('_cls', 'Person'), ('name', 'James'), ('age', 34)]), {}))
+
+        p.doc = 123
+        del p.doc
+        self.assertEqual(p._delta(), (
+            SON([('_cls', 'Person'), ('name', 'James'), ('age', 34)]), {}))
+
+        p = Person()
+        p.name = "Dean"
+        p.age = 22
+        p.save()
+
+        p.age = 24
+        self.assertEqual(p.age, 24)
+        self.assertEqual(p._get_changed_fields(), ['age'])
+        self.assertEqual(p._delta(), ({'age': 24}, {}))
+
+        p = Person.objects(age=22).get()
+        p.age = 24
+        self.assertEqual(p.age, 24)
+        self.assertEqual(p._get_changed_fields(), ['age'])
+        self.assertEqual(p._delta(), ({'age': 24}, {}))
+
+        p.save()
+        self.assertEqual(1, Person.objects(age=24).count())
+
+    def test_dynamic_delta(self):
+
+        class Doc(DynamicDocument):
+            pass
+
+        Doc.drop_collection()
+        doc = Doc()
+        doc.save()
+
+        doc = Doc.objects.first()
+        self.assertEqual(doc._get_changed_fields(), [])
+        self.assertEqual(doc._delta(), ({}, {}))
+
+        doc.string_field = 'hello'
+        self.assertEqual(doc._get_changed_fields(), ['string_field'])
+        self.assertEqual(doc._delta(), ({'string_field': 'hello'}, {}))
+
+        doc._changed_fields = []
+        doc.int_field = 1
+        self.assertEqual(doc._get_changed_fields(), ['int_field'])
+        self.assertEqual(doc._delta(), ({'int_field': 1}, {}))
+
+        doc._changed_fields = []
+        dict_value = {'hello': 'world', 'ping': 'pong'}
+        doc.dict_field = dict_value
+        self.assertEqual(doc._get_changed_fields(), ['dict_field'])
+        self.assertEqual(doc._delta(), ({'dict_field': dict_value}, {}))
+
+        doc._changed_fields = []
+        list_value = ['1', 2, {'hello': 'world'}]
+        doc.list_field = list_value
+        self.assertEqual(doc._get_changed_fields(), ['list_field'])
+        self.assertEqual(doc._delta(), ({'list_field': list_value}, {}))
+
+        # Test unsetting
+        doc._changed_fields = []
+        doc.dict_field = {}
+        self.assertEqual(doc._get_changed_fields(), ['dict_field'])
+        self.assertEqual(doc._delta(), ({}, {'dict_field': 1}))
+
+        doc._changed_fields = []
+        doc.list_field = []
+        self.assertEqual(doc._get_changed_fields(), ['list_field'])
+        self.assertEqual(doc._delta(), ({}, {'list_field': 1}))
+
+    def test_delta_with_dbref_true(self):
+        person, organization, employee = self.circular_reference_deltas_2(Document, Document, True)
+        employee.name = 'test'
+
+        self.assertEqual(organization._get_changed_fields(), [])
+
+        updates, removals = organization._delta()
+        self.assertEqual({}, removals)
+        self.assertEqual({}, updates)
+
+        organization.employees.append(person)
+        updates, removals = organization._delta()
+        self.assertEqual({}, removals)
+        self.assertTrue('employees' in updates)
+
+    def test_delta_with_dbref_false(self):
+        person, organization, employee = self.circular_reference_deltas_2(Document, Document, False)
+        employee.name = 'test'
+
+        self.assertEqual(organization._get_changed_fields(), [])
+
+        updates, removals = organization._delta()
+        self.assertEqual({}, removals)
+        self.assertEqual({}, updates)
+
+        organization.employees.append(person)
+        updates, removals = organization._delta()
+        self.assertEqual({}, removals)
+        self.assertTrue('employees' in updates)
+
+    def test_nested_nested_fields_mark_as_changed(self):
+        class EmbeddedDoc(EmbeddedDocument):
+            name = StringField()
+
+        class MyDoc(Document):
+            subs = MapField(MapField(EmbeddedDocumentField(EmbeddedDoc)))
+            name = StringField()
+
+        MyDoc.drop_collection()
+
+        mydoc = MyDoc(name='testcase1', subs={'a': {'b': EmbeddedDoc(name='foo')}}).save()
+
+        mydoc = MyDoc.objects.first()
+        subdoc = mydoc.subs['a']['b']
+        subdoc.name = 'bar'
+
+        self.assertEqual(["name"], subdoc._get_changed_fields())
+        self.assertEqual(["subs.a.b.name"], mydoc._get_changed_fields())
+
+        mydoc._clear_changed_fields()
+        self.assertEqual([], mydoc._get_changed_fields())
+
+    def test_lower_level_mark_as_changed(self):
+        class EmbeddedDoc(EmbeddedDocument):
+            name = StringField()
+
+        class MyDoc(Document):
+            subs = MapField(EmbeddedDocumentField(EmbeddedDoc))
+
+        MyDoc.drop_collection()
+
+        MyDoc().save()
+
+        mydoc = MyDoc.objects.first()
+        mydoc.subs['a'] = EmbeddedDoc()
+        self.assertEqual(["subs.a"], mydoc._get_changed_fields())
+
+        subdoc = mydoc.subs['a']
+        subdoc.name = 'bar'
+
+        self.assertEqual(["name"], subdoc._get_changed_fields())
+        self.assertEqual(["subs.a"], mydoc._get_changed_fields())
+        mydoc.save()
+
+        mydoc._clear_changed_fields()
+        self.assertEqual([], mydoc._get_changed_fields())
+
+    def test_upper_level_mark_as_changed(self):
+        class EmbeddedDoc(EmbeddedDocument):
+            name = StringField()
+
+        class MyDoc(Document):
+            subs = MapField(EmbeddedDocumentField(EmbeddedDoc))
+
+        MyDoc.drop_collection()
+
+        MyDoc(subs={'a': EmbeddedDoc(name='foo')}).save()
+
+        mydoc = MyDoc.objects.first()
+        subdoc = mydoc.subs['a']
+        subdoc.name = 'bar'
+
+        self.assertEqual(["name"], subdoc._get_changed_fields())
+        self.assertEqual(["subs.a.name"], mydoc._get_changed_fields())
+
+        mydoc.subs['a'] = EmbeddedDoc()
+        self.assertEqual(["subs.a"], mydoc._get_changed_fields())
+        mydoc.save()
+
+        mydoc._clear_changed_fields()
+        self.assertEqual([], mydoc._get_changed_fields())
+
+    def test_referenced_object_changed_attributes(self):
+        """Ensures that when you save a new reference to a field, the referenced object isn't altered"""
+
+        class Organization(Document):
+            name = StringField()
+
+        class User(Document):
+            name = StringField()
+            org = ReferenceField('Organization', required=True)
+
+        Organization.drop_collection()
+        User.drop_collection()
+
+        org1 = Organization(name='Org 1')
+        org1.save()
+
+        org2 = Organization(name='Org 2')
+        org2.save()
+
+        user = User(name='Fred', org=org1)
+        user.save()
+
+        org1.reload()
+        org2.reload()
+        user.reload()
+        self.assertEqual(org1.name, 'Org 1')
+        self.assertEqual(org2.name, 'Org 2')
+        self.assertEqual(user.name, 'Fred')
+
+        user.name = 'Harold'
+        user.org = org2
+
+        org2.name = 'New Org 2'
+        self.assertEqual(org2.name, 'New Org 2')
+
+        user.save()
+        org2.save()
+
+        self.assertEqual(org2.name, 'New Org 2')
+        org2.reload()
+        self.assertEqual(org2.name, 'New Org 2')
+
+    def test_delta_for_nested_map_fields(self):
+        class UInfoDocument(Document):
+            phone = StringField()
+
+        class EmbeddedRole(EmbeddedDocument):
+            type = StringField()
+
+        class EmbeddedUser(EmbeddedDocument):
+            name = StringField()
+            roles = MapField(field=EmbeddedDocumentField(EmbeddedRole))
+            rolist = ListField(field=EmbeddedDocumentField(EmbeddedRole))
+            info = ReferenceField(UInfoDocument)
+
+        class Doc(Document):
+            users = MapField(field=EmbeddedDocumentField(EmbeddedUser))
+            num = IntField(default=-1)
+
+        Doc.drop_collection()
+
+        doc = Doc(num=1)
+        doc.users["007"] = EmbeddedUser(name="Agent007")
+        doc.save()
+
+        uinfo = UInfoDocument(phone="79089269066")
+        uinfo.save()
+
+        d = Doc.objects(num=1).first()
+        d.users["007"]["roles"]["666"] = EmbeddedRole(type="superadmin")
+        d.users["007"]["rolist"].append(EmbeddedRole(type="oops"))
+        d.users["007"]["info"] = uinfo
+        delta = d._delta()
+        self.assertEqual(True, "users.007.roles.666" in delta[0])
+        self.assertEqual(True, "users.007.rolist" in delta[0])
+        self.assertEqual(True, "users.007.info" in delta[0])
+        self.assertEqual('superadmin', delta[0]["users.007.roles.666"]["type"])
+        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/test_dynamic.py
+++ b/tests/document/test_dynamic.py
@ -1,20 +1,20 @@
 import unittest

-import pytest
-
 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().setUp()
+        connect(db='mongoenginetest')
+        self.db = get_db()

        class Person(DynamicDocument):
            name = StringField()
-            meta = {"allow_inheritance": True}
+            meta = {'allow_inheritance': True}

        Person.drop_collection()

@ -27,28 +27,16 @@ class TestDynamicDocument(MongoDBTestCase):
        p.name = "James"
        p.age = 34

-        assert p.to_mongo() == {"_cls": "Person", "name": "James", "age": 34}
-        assert p.to_mongo().keys() == ["_cls", "name", "age"]
+        self.assertEqual(p.to_mongo(), {"_cls": "Person", "name": "James",
+                                        "age": 34})
+        self.assertEqual(p.to_mongo().keys(), ["_cls", "name", "age"])
        p.save()
-        assert p.to_mongo().keys() == ["_id", "_cls", "name", "age"]
+        self.assertEqual(p.to_mongo().keys(), ["_id", "_cls", "name", "age"])

-        assert self.Person.objects.first().age == 34
+        self.assertEqual(self.Person.objects.first().age, 34)

        # Confirm no changes to self.Person
-        assert not hasattr(self.Person, "age")
-
-    def test_dynamic_document_parse_values_in_constructor_like_document_do(self):
-        class ProductDynamicDocument(DynamicDocument):
-            title = StringField()
-            price = FloatField()
-
-        class ProductDocument(Document):
-            title = StringField()
-            price = FloatField()
-
-        product = ProductDocument(title="Blabla", price="12.5")
-        dyn_product = ProductDynamicDocument(title="Blabla", price="12.5")
-        assert product.price == dyn_product.price == 12.5
+        self.assertFalse(hasattr(self.Person, 'age'))

    def test_change_scope_of_variable(self):
        """Test changing the scope of a dynamic field has no adverse effects"""
@ -58,11 +46,11 @@ class TestDynamicDocument(MongoDBTestCase):
        p.save()

        p = self.Person.objects.get()
-        p.misc = {"hello": "world"}
+        p.misc = {'hello': 'world'}
        p.save()

        p = self.Person.objects.get()
-        assert p.misc == {"hello": "world"}
+        self.assertEqual(p.misc, {'hello': 'world'})

    def test_delete_dynamic_field(self):
        """Test deleting a dynamic field works"""
@ -73,23 +61,23 @@ class TestDynamicDocument(MongoDBTestCase):
        p.save()

        p = self.Person.objects.get()
-        p.misc = {"hello": "world"}
+        p.misc = {'hello': 'world'}
        p.save()

        p = self.Person.objects.get()
-        assert p.misc == {"hello": "world"}
+        self.assertEqual(p.misc, {'hello': 'world'})
        collection = self.db[self.Person._get_collection_name()]
        obj = collection.find_one()
-        assert sorted(obj.keys()) == ["_cls", "_id", "misc", "name"]
+        self.assertEqual(sorted(obj.keys()), ['_cls', '_id', 'misc', 'name'])

        del p.misc
        p.save()

        p = self.Person.objects.get()
-        assert not hasattr(p, "misc")
+        self.assertFalse(hasattr(p, 'misc'))

        obj = collection.find_one()
-        assert sorted(obj.keys()) == ["_cls", "_id", "name"]
+        self.assertEqual(sorted(obj.keys()), ['_cls', '_id', 'name'])

    def test_reload_after_unsetting(self):
        p = self.Person()
@ -103,55 +91,12 @@ class TestDynamicDocument(MongoDBTestCase):
        p = self.Person.objects.create()
        p.update(age=1)

-        assert len(p._data) == 3
-        assert sorted(p._data.keys()) == ["_cls", "id", "name"]
+        self.assertEqual(len(p._data), 3)
+        self.assertEqual(sorted(p._data.keys()), ['_cls', 'id', 'name'])

        p.reload()
-        assert len(p._data) == 4
-        assert 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)
-        assert raw_p == {"_cls": "Person", "_id": p.id, "name": "Dean"}
-
-        p.name = "OldDean"
-        p.newattr = "garbage"
-        p.save()
-        raw_p = Person.objects.as_pymongo().get(id=p.id)
-        assert raw_p == {
-            "_cls": "Person",
-            "_id": p.id,
-            "name": "OldDean",
-            "newattr": "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)
-        assert raw_p == {"_id": p.id, "_name": "Dean", "name": "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)
-        assert raw_p == {"_id": p.id, "_name": "NewDean", "name": "OldDean"}
+        self.assertEqual(len(p._data), 4)
+        self.assertEqual(sorted(p._data.keys()), ['_cls', 'age', 'id', 'name'])

    def test_dynamic_document_queries(self):
        """Ensure we can query dynamic fields"""
@ -160,10 +105,10 @@ class TestDynamicDocument(MongoDBTestCase):
        p.age = 22
        p.save()

-        assert 1 == self.Person.objects(age=22).count()
+        self.assertEqual(1, self.Person.objects(age=22).count())
        p = self.Person.objects(age=22)
        p = p.get()
-        assert 22 == p.age
+        self.assertEqual(22, p.age)

    def test_complex_dynamic_document_queries(self):
        class Person(DynamicDocument):
@ -183,25 +128,26 @@ class TestDynamicDocument(MongoDBTestCase):
        p2.age = 10
        p2.save()

-        assert Person.objects(age__icontains="ten").count() == 2
-        assert Person.objects(age__gte=10).count() == 1
+        self.assertEqual(Person.objects(age__icontains='ten').count(), 2)
+        self.assertEqual(Person.objects(age__gte=10).count(), 1)

    def test_complex_data_lookups(self):
        """Ensure you can query dynamic document dynamic fields"""
        p = self.Person()
-        p.misc = {"hello": "world"}
+        p.misc = {'hello': 'world'}
        p.save()

-        assert 1 == self.Person.objects(misc__hello="world").count()
+        self.assertEqual(1, self.Person.objects(misc__hello='world').count())

    def test_three_level_complex_data_lookups(self):
        """Ensure you can query three level document dynamic fields"""
-        self.Person.objects.create(misc={"hello": {"hello2": "world"}})
-        assert 1 == self.Person.objects(misc__hello__hello2="world").count()
+        p = self.Person.objects.create(
+            misc={'hello': {'hello2': 'world'}}
+        )
+        self.assertEqual(1, self.Person.objects(misc__hello__hello2='world').count())

    def test_complex_embedded_document_validation(self):
        """Ensure embedded dynamic documents may be validated"""
-
        class Embedded(DynamicEmbeddedDocument):
            content = URLField()

@ -211,29 +157,27 @@ class TestDynamicDocument(MongoDBTestCase):
        Doc.drop_collection()
        doc = Doc()

-        embedded_doc_1 = Embedded(content="http://mongoengine.org")
+        embedded_doc_1 = Embedded(content='http://mongoengine.org')
        embedded_doc_1.validate()

-        embedded_doc_2 = Embedded(content="this is not a url")
-        with pytest.raises(ValidationError):
-            embedded_doc_2.validate()
+        embedded_doc_2 = Embedded(content='this is not a url')
+        self.assertRaises(ValidationError, embedded_doc_2.validate)

        doc.embedded_field_1 = embedded_doc_1
        doc.embedded_field_2 = embedded_doc_2
-        with pytest.raises(ValidationError):
-            doc.validate()
+        self.assertRaises(ValidationError, doc.validate)

    def test_inheritance(self):
        """Ensure that dynamic document plays nice with inheritance"""
-
        class Employee(self.Person):
            salary = IntField()

        Employee.drop_collection()

-        assert "name" in Employee._fields
-        assert "salary" in Employee._fields
-        assert Employee._get_collection_name() == self.Person._get_collection_name()
+        self.assertTrue('name' in Employee._fields)
+        self.assertTrue('salary' in Employee._fields)
+        self.assertEqual(Employee._get_collection_name(),
+                         self.Person._get_collection_name())

        joe_bloggs = Employee()
        joe_bloggs.name = "Joe Bloggs"
@ -241,15 +185,14 @@ class TestDynamicDocument(MongoDBTestCase):
        joe_bloggs.age = 20
        joe_bloggs.save()

-        assert 1 == self.Person.objects(age=20).count()
-        assert 1 == Employee.objects(age=20).count()
+        self.assertEqual(1, self.Person.objects(age=20).count())
+        self.assertEqual(1, Employee.objects(age=20).count())

        joe_bloggs = self.Person.objects.first()
-        assert isinstance(joe_bloggs, Employee)
+        self.assertTrue(isinstance(joe_bloggs, Employee))

    def test_embedded_dynamic_document(self):
        """Test dynamic embedded documents"""
-
        class Embedded(DynamicEmbeddedDocument):
            pass

@ -260,33 +203,33 @@ class TestDynamicDocument(MongoDBTestCase):
        doc = Doc()

        embedded_1 = Embedded()
-        embedded_1.string_field = "hello"
+        embedded_1.string_field = 'hello'
        embedded_1.int_field = 1
-        embedded_1.dict_field = {"hello": "world"}
-        embedded_1.list_field = ["1", 2, {"hello": "world"}]
+        embedded_1.dict_field = {'hello': 'world'}
+        embedded_1.list_field = ['1', 2, {'hello': 'world'}]
        doc.embedded_field = embedded_1

-        assert doc.to_mongo() == {
+        self.assertEqual(doc.to_mongo(), {
            "embedded_field": {
                "_cls": "Embedded",
                "string_field": "hello",
                "int_field": 1,
                "dict_field": {"hello": "world"},
-                "list_field": ["1", 2, {"hello": "world"}],
+                "list_field": ['1', 2, {'hello': 'world'}]
            }
-        }
+        })
        doc.save()

        doc = Doc.objects.first()
-        assert doc.embedded_field.__class__ == Embedded
-        assert doc.embedded_field.string_field == "hello"
-        assert doc.embedded_field.int_field == 1
-        assert doc.embedded_field.dict_field == {"hello": "world"}
-        assert doc.embedded_field.list_field == ["1", 2, {"hello": "world"}]
+        self.assertEqual(doc.embedded_field.__class__, Embedded)
+        self.assertEqual(doc.embedded_field.string_field, "hello")
+        self.assertEqual(doc.embedded_field.int_field, 1)
+        self.assertEqual(doc.embedded_field.dict_field, {'hello': 'world'})
+        self.assertEqual(doc.embedded_field.list_field,
+                            ['1', 2, {'hello': 'world'}])

    def test_complex_embedded_documents(self):
        """Test complex dynamic embedded documents setups"""
-
        class Embedded(DynamicEmbeddedDocument):
            pass

@ -297,54 +240,51 @@ class TestDynamicDocument(MongoDBTestCase):
        doc = Doc()

        embedded_1 = Embedded()
-        embedded_1.string_field = "hello"
+        embedded_1.string_field = 'hello'
        embedded_1.int_field = 1
-        embedded_1.dict_field = {"hello": "world"}
+        embedded_1.dict_field = {'hello': 'world'}

        embedded_2 = Embedded()
-        embedded_2.string_field = "hello"
+        embedded_2.string_field = 'hello'
        embedded_2.int_field = 1
-        embedded_2.dict_field = {"hello": "world"}
-        embedded_2.list_field = ["1", 2, {"hello": "world"}]
+        embedded_2.dict_field = {'hello': 'world'}
+        embedded_2.list_field = ['1', 2, {'hello': 'world'}]

-        embedded_1.list_field = ["1", 2, embedded_2]
+        embedded_1.list_field = ['1', 2, embedded_2]
        doc.embedded_field = embedded_1

-        assert doc.to_mongo() == {
+        self.assertEqual(doc.to_mongo(), {
            "embedded_field": {
                "_cls": "Embedded",
                "string_field": "hello",
                "int_field": 1,
                "dict_field": {"hello": "world"},
-                "list_field": [
-                    "1",
-                    2,
-                    {
-                        "_cls": "Embedded",
-                        "string_field": "hello",
-                        "int_field": 1,
-                        "dict_field": {"hello": "world"},
-                        "list_field": ["1", 2, {"hello": "world"}],
-                    },
-                ],
+                "list_field": ['1', 2,
+                    {"_cls": "Embedded",
+                    "string_field": "hello",
+                    "int_field": 1,
+                    "dict_field": {"hello": "world"},
+                    "list_field": ['1', 2, {'hello': 'world'}]}
+                ]
            }
-        }
+        })
        doc.save()
        doc = Doc.objects.first()
-        assert doc.embedded_field.__class__ == Embedded
-        assert doc.embedded_field.string_field == "hello"
-        assert doc.embedded_field.int_field == 1
-        assert doc.embedded_field.dict_field == {"hello": "world"}
-        assert doc.embedded_field.list_field[0] == "1"
-        assert doc.embedded_field.list_field[1] == 2
+        self.assertEqual(doc.embedded_field.__class__, Embedded)
+        self.assertEqual(doc.embedded_field.string_field, "hello")
+        self.assertEqual(doc.embedded_field.int_field, 1)
+        self.assertEqual(doc.embedded_field.dict_field, {'hello': 'world'})
+        self.assertEqual(doc.embedded_field.list_field[0], '1')
+        self.assertEqual(doc.embedded_field.list_field[1], 2)

        embedded_field = doc.embedded_field.list_field[2]

-        assert embedded_field.__class__ == Embedded
-        assert embedded_field.string_field == "hello"
-        assert embedded_field.int_field == 1
-        assert embedded_field.dict_field == {"hello": "world"}
-        assert embedded_field.list_field == ["1", 2, {"hello": "world"}]
+        self.assertEqual(embedded_field.__class__, Embedded)
+        self.assertEqual(embedded_field.string_field, "hello")
+        self.assertEqual(embedded_field.int_field, 1)
+        self.assertEqual(embedded_field.dict_field, {'hello': 'world'})
+        self.assertEqual(embedded_field.list_field, ['1', 2,
+                                                        {'hello': 'world'}])

    def test_dynamic_and_embedded(self):
        """Ensure embedded documents play nicely"""
@ -363,18 +303,18 @@ class TestDynamicDocument(MongoDBTestCase):
        person.address.city = "Lundenne"
        person.save()

-        assert Person.objects.first().address.city == "Lundenne"
+        self.assertEqual(Person.objects.first().address.city, "Lundenne")

        person = Person.objects.first()
        person.address = Address(city="Londinium")
        person.save()

-        assert Person.objects.first().address.city == "Londinium"
+        self.assertEqual(Person.objects.first().address.city, "Londinium")

        person = Person.objects.first()
        person.age = 35
        person.save()
-        assert Person.objects.first().age == 35
+        self.assertEqual(Person.objects.first().age, 35)

    def test_dynamic_embedded_works_with_only(self):
        """Ensure custom fieldnames on a dynamic embedded document are found by qs.only()"""
@ -387,15 +327,10 @@ class TestDynamicDocument(MongoDBTestCase):

        Person.drop_collection()

-        Person(
-            name="Eric", address=Address(city="San Francisco", street_number="1337")
-        ).save()
+        Person(name="Eric", address=Address(city="San Francisco", street_number="1337")).save()

-        assert Person.objects.first().address.street_number == "1337"
-        assert (
-            Person.objects.only("address__street_number").first().address.street_number
-            == "1337"
-        )
+        self.assertEqual(Person.objects.first().address.street_number, '1337')
+        self.assertEqual(Person.objects.only('address__street_number').first().address.street_number, '1337')

    def test_dynamic_and_embedded_dict_access(self):
        """Ensure embedded dynamic documents work with dict[] style access"""
@ -419,21 +354,20 @@ class TestDynamicDocument(MongoDBTestCase):
        person["address"]["city"] = "Lundenne"
        person.save()

-        assert Person.objects.first().address.city == "Lundenne"
+        self.assertEqual(Person.objects.first().address.city, "Lundenne")

-        assert Person.objects.first().phone == "555-1212"
+        self.assertEqual(Person.objects.first().phone, "555-1212")

        person = Person.objects.first()
        person.address = Address(city="Londinium")
        person.save()

-        assert Person.objects.first().address.city == "Londinium"
+        self.assertEqual(Person.objects.first().address.city, "Londinium")

        person = Person.objects.first()
        person["age"] = 35
        person.save()
-        assert Person.objects.first().age == 35
+        self.assertEqual(Person.objects.first().age, 35)

-
-if __name__ == "__main__":
+if __name__ == '__main__':
    unittest.main()
--- a/tests/document/indexes.py
+++ b/tests/document/indexes.py
--- a/tests/document/inheritance.py
+++ b/tests/document/inheritance.py
@ -0,0 +1,512 @@
+# -*- coding: utf-8 -*-
+import unittest
+import warnings
+
+from datetime import datetime
+
+from tests.fixtures import Base
+
+from mongoengine import Document, EmbeddedDocument, connect
+from mongoengine.connection import get_db
+from mongoengine.fields import (BooleanField, GenericReferenceField,
+                                IntField, StringField)
+
+__all__ = ('InheritanceTest', )
+
+
+class InheritanceTest(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+        self.db = get_db()
+
+    def tearDown(self):
+        for collection in self.db.collection_names():
+            if 'system.' in collection:
+                continue
+            self.db.drop_collection(collection)
+
+    def test_superclasses(self):
+        """Ensure that the correct list of superclasses is assembled.
+        """
+        class Animal(Document):
+            meta = {'allow_inheritance': True}
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        self.assertEqual(Animal._superclasses, ())
+        self.assertEqual(Fish._superclasses, ('Animal',))
+        self.assertEqual(Guppy._superclasses, ('Animal', 'Animal.Fish'))
+        self.assertEqual(Mammal._superclasses, ('Animal',))
+        self.assertEqual(Dog._superclasses, ('Animal', 'Animal.Mammal'))
+        self.assertEqual(Human._superclasses, ('Animal', 'Animal.Mammal'))
+
+    def test_external_superclasses(self):
+        """Ensure that the correct list of super classes is assembled when
+        importing part of the model.
+        """
+        class Animal(Base): pass
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        self.assertEqual(Animal._superclasses, ('Base', ))
+        self.assertEqual(Fish._superclasses, ('Base', 'Base.Animal',))
+        self.assertEqual(Guppy._superclasses, ('Base', 'Base.Animal',
+                                               'Base.Animal.Fish'))
+        self.assertEqual(Mammal._superclasses, ('Base', 'Base.Animal',))
+        self.assertEqual(Dog._superclasses, ('Base', 'Base.Animal',
+                                             'Base.Animal.Mammal'))
+        self.assertEqual(Human._superclasses, ('Base', 'Base.Animal',
+                                               'Base.Animal.Mammal'))
+
+    def test_subclasses(self):
+        """Ensure that the correct list of _subclasses (subclasses) is
+        assembled.
+        """
+        class Animal(Document):
+            meta = {'allow_inheritance': True}
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        self.assertEqual(Animal._subclasses, ('Animal',
+                                         'Animal.Fish',
+                                         'Animal.Fish.Guppy',
+                                         'Animal.Mammal',
+                                         'Animal.Mammal.Dog',
+                                         'Animal.Mammal.Human'))
+        self.assertEqual(Fish._subclasses, ('Animal.Fish',
+                                       'Animal.Fish.Guppy',))
+        self.assertEqual(Guppy._subclasses, ('Animal.Fish.Guppy',))
+        self.assertEqual(Mammal._subclasses, ('Animal.Mammal',
+                                         'Animal.Mammal.Dog',
+                                         'Animal.Mammal.Human'))
+        self.assertEqual(Human._subclasses, ('Animal.Mammal.Human',))
+
+    def test_external_subclasses(self):
+        """Ensure that the correct list of _subclasses (subclasses) is
+        assembled when importing part of the model.
+        """
+        class Animal(Base): pass
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        self.assertEqual(Animal._subclasses, ('Base.Animal',
+                                              'Base.Animal.Fish',
+                                              'Base.Animal.Fish.Guppy',
+                                              'Base.Animal.Mammal',
+                                              'Base.Animal.Mammal.Dog',
+                                              'Base.Animal.Mammal.Human'))
+        self.assertEqual(Fish._subclasses, ('Base.Animal.Fish',
+                                            'Base.Animal.Fish.Guppy',))
+        self.assertEqual(Guppy._subclasses, ('Base.Animal.Fish.Guppy',))
+        self.assertEqual(Mammal._subclasses, ('Base.Animal.Mammal',
+                                              'Base.Animal.Mammal.Dog',
+                                              'Base.Animal.Mammal.Human'))
+        self.assertEqual(Human._subclasses, ('Base.Animal.Mammal.Human',))
+
+    def test_dynamic_declarations(self):
+        """Test that declaring an extra class updates meta data"""
+
+        class Animal(Document):
+            meta = {'allow_inheritance': True}
+
+        self.assertEqual(Animal._superclasses, ())
+        self.assertEqual(Animal._subclasses, ('Animal',))
+
+        # Test dynamically adding a class changes the meta data
+        class Fish(Animal):
+            pass
+
+        self.assertEqual(Animal._superclasses, ())
+        self.assertEqual(Animal._subclasses, ('Animal', 'Animal.Fish'))
+
+        self.assertEqual(Fish._superclasses, ('Animal', ))
+        self.assertEqual(Fish._subclasses, ('Animal.Fish',))
+
+        # Test dynamically adding an inherited class changes the meta data
+        class Pike(Fish):
+            pass
+
+        self.assertEqual(Animal._superclasses, ())
+        self.assertEqual(Animal._subclasses, ('Animal', 'Animal.Fish',
+                                              'Animal.Fish.Pike'))
+
+        self.assertEqual(Fish._superclasses, ('Animal', ))
+        self.assertEqual(Fish._subclasses, ('Animal.Fish', 'Animal.Fish.Pike'))
+
+        self.assertEqual(Pike._superclasses, ('Animal', 'Animal.Fish'))
+        self.assertEqual(Pike._subclasses, ('Animal.Fish.Pike',))
+
+    def test_inheritance_meta_data(self):
+        """Ensure that document may inherit fields from a superclass document.
+        """
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+            meta = {'allow_inheritance': True}
+
+        class Employee(Person):
+            salary = IntField()
+
+        self.assertEqual(['_cls', 'age', 'id', 'name', 'salary'],
+                         sorted(Employee._fields.keys()))
+        self.assertEqual(Employee._get_collection_name(),
+                         Person._get_collection_name())
+
+    def test_inheritance_to_mongo_keys(self):
+        """Ensure that document may inherit fields from a superclass document.
+        """
+        class Person(Document):
+            name = StringField()
+            age = IntField()
+
+            meta = {'allow_inheritance': True}
+
+        class Employee(Person):
+            salary = IntField()
+
+        self.assertEqual(['_cls', 'age', 'id', 'name', 'salary'],
+                         sorted(Employee._fields.keys()))
+        self.assertEqual(Person(name="Bob", age=35).to_mongo().keys(),
+                         ['_cls', 'name', 'age'])
+        self.assertEqual(Employee(name="Bob", age=35, salary=0).to_mongo().keys(),
+                         ['_cls', 'name', 'age', 'salary'])
+        self.assertEqual(Employee._get_collection_name(),
+                         Person._get_collection_name())
+
+    def test_indexes_and_multiple_inheritance(self):
+        """ Ensure that all of the indexes are created for a document with
+        multiple inheritance.
+        """
+
+        class A(Document):
+            a = StringField()
+
+            meta = {
+                'allow_inheritance': True,
+                'indexes': ['a']
+            }
+
+        class B(Document):
+            b = StringField()
+
+            meta = {
+                'allow_inheritance': True,
+                'indexes': ['b']
+            }
+
+        class C(A, B):
+            pass
+
+        A.drop_collection()
+        B.drop_collection()
+        C.drop_collection()
+
+        C.ensure_indexes()
+
+        self.assertEqual(
+            sorted([idx['key'] for idx in C._get_collection().index_information().values()]),
+            sorted([[(u'_cls', 1), (u'b', 1)], [(u'_id', 1)], [(u'_cls', 1), (u'a', 1)]])
+        )
+
+    def test_polymorphic_queries(self):
+        """Ensure that the correct subclasses are returned from a query
+        """
+
+        class Animal(Document):
+            meta = {'allow_inheritance': True}
+        class Fish(Animal): pass
+        class Mammal(Animal): pass
+        class Dog(Mammal): pass
+        class Human(Mammal): pass
+
+        Animal.drop_collection()
+
+        Animal().save()
+        Fish().save()
+        Mammal().save()
+        Dog().save()
+        Human().save()
+
+        classes = [obj.__class__ for obj in Animal.objects]
+        self.assertEqual(classes, [Animal, Fish, Mammal, Dog, Human])
+
+        classes = [obj.__class__ for obj in Mammal.objects]
+        self.assertEqual(classes, [Mammal, Dog, Human])
+
+        classes = [obj.__class__ for obj in Human.objects]
+        self.assertEqual(classes, [Human])
+
+    def test_allow_inheritance(self):
+        """Ensure that inheritance is disabled by default on simple
+        classes and that _cls will not be used.
+        """
+        class Animal(Document):
+            name = StringField()
+
+        # can't inherit because Animal didn't explicitly allow inheritance
+        with self.assertRaises(ValueError):
+            class Dog(Animal):
+                pass
+
+        # Check that _cls etc aren't present on simple documents
+        dog = Animal(name='dog').save()
+        self.assertEqual(dog.to_mongo().keys(), ['_id', 'name'])
+
+        collection = self.db[Animal._get_collection_name()]
+        obj = collection.find_one()
+        self.assertFalse('_cls' in obj)
+
+    def test_cant_turn_off_inheritance_on_subclass(self):
+        """Ensure if inheritance is on in a subclass you cant turn it off.
+        """
+        class Animal(Document):
+            name = StringField()
+            meta = {'allow_inheritance': True}
+
+        with self.assertRaises(ValueError):
+            class Mammal(Animal):
+                meta = {'allow_inheritance': False}
+
+    def test_allow_inheritance_abstract_document(self):
+        """Ensure that abstract documents can set inheritance rules and that
+        _cls will not be used.
+        """
+        class FinalDocument(Document):
+            meta = {'abstract': True,
+                    'allow_inheritance': False}
+
+        class Animal(FinalDocument):
+            name = StringField()
+
+        with self.assertRaises(ValueError):
+            class Mammal(Animal):
+                pass
+
+        # Check that _cls isn't present in simple documents
+        doc = Animal(name='dog')
+        self.assertFalse('_cls' in doc.to_mongo())
+
+    def test_abstract_handle_ids_in_metaclass_properly(self):
+
+        class City(Document):
+            continent = StringField()
+            meta = {'abstract': True,
+                    'allow_inheritance': False}
+
+        class EuropeanCity(City):
+            name = StringField()
+
+        berlin = EuropeanCity(name='Berlin', continent='Europe')
+        self.assertEqual(len(berlin._db_field_map), len(berlin._fields_ordered))
+        self.assertEqual(len(berlin._reverse_db_field_map), len(berlin._fields_ordered))
+        self.assertEqual(len(berlin._fields_ordered), 3)
+        self.assertEqual(berlin._fields_ordered[0], 'id')
+
+    def test_auto_id_not_set_if_specific_in_parent_class(self):
+
+        class City(Document):
+            continent = StringField()
+            city_id = IntField(primary_key=True)
+            meta = {'abstract': True,
+                    'allow_inheritance': False}
+
+        class EuropeanCity(City):
+            name = StringField()
+
+        berlin = EuropeanCity(name='Berlin', continent='Europe')
+        self.assertEqual(len(berlin._db_field_map), len(berlin._fields_ordered))
+        self.assertEqual(len(berlin._reverse_db_field_map), len(berlin._fields_ordered))
+        self.assertEqual(len(berlin._fields_ordered), 3)
+        self.assertEqual(berlin._fields_ordered[0], 'city_id')
+
+    def test_auto_id_vs_non_pk_id_field(self):
+
+        class City(Document):
+            continent = StringField()
+            id = IntField()
+            meta = {'abstract': True,
+                    'allow_inheritance': False}
+
+        class EuropeanCity(City):
+            name = StringField()
+
+        berlin = EuropeanCity(name='Berlin', continent='Europe')
+        self.assertEqual(len(berlin._db_field_map), len(berlin._fields_ordered))
+        self.assertEqual(len(berlin._reverse_db_field_map), len(berlin._fields_ordered))
+        self.assertEqual(len(berlin._fields_ordered), 4)
+        self.assertEqual(berlin._fields_ordered[0], 'auto_id_0')
+        berlin.save()
+        self.assertEqual(berlin.pk, berlin.auto_id_0)
+
+    def test_abstract_document_creation_does_not_fail(self):
+        class City(Document):
+            continent = StringField()
+            meta = {'abstract': True,
+                    'allow_inheritance': False}
+
+        bkk = City(continent='asia')
+        self.assertEqual(None, bkk.pk)
+        # TODO: expected error? Shouldn't we create a new error type?
+        with self.assertRaises(KeyError):
+            setattr(bkk, 'pk', 1)
+
+    def test_allow_inheritance_embedded_document(self):
+        """Ensure embedded documents respect inheritance."""
+        class Comment(EmbeddedDocument):
+            content = StringField()
+
+        with self.assertRaises(ValueError):
+            class SpecialComment(Comment):
+                pass
+
+        doc = Comment(content='test')
+        self.assertFalse('_cls' in doc.to_mongo())
+
+        class Comment(EmbeddedDocument):
+            content = StringField()
+            meta = {'allow_inheritance': True}
+
+        doc = Comment(content='test')
+        self.assertTrue('_cls' in doc.to_mongo())
+
+    def test_document_inheritance(self):
+        """Ensure mutliple inheritance of abstract documents
+        """
+        class DateCreatedDocument(Document):
+            meta = {
+                'allow_inheritance': True,
+                'abstract': True,
+            }
+
+        class DateUpdatedDocument(Document):
+            meta = {
+                'allow_inheritance': True,
+                'abstract': True,
+            }
+
+        try:
+            class MyDocument(DateCreatedDocument, DateUpdatedDocument):
+                pass
+        except Exception:
+            self.assertTrue(False, "Couldn't create MyDocument class")
+
+    def test_abstract_documents(self):
+        """Ensure that a document superclass can be marked as abstract
+        thereby not using it as the name for the collection."""
+
+        defaults = {'index_background': True,
+                    'index_drop_dups': True,
+                    'index_opts': {'hello': 'world'},
+                    'allow_inheritance': True,
+                    'queryset_class': 'QuerySet',
+                    'db_alias': 'myDB',
+                    'shard_key': ('hello', 'world')}
+
+        meta_settings = {'abstract': True}
+        meta_settings.update(defaults)
+
+        class Animal(Document):
+            name = StringField()
+            meta = meta_settings
+
+        class Fish(Animal): pass
+        class Guppy(Fish): pass
+
+        class Mammal(Animal):
+            meta = {'abstract': True}
+        class Human(Mammal): pass
+
+        for k, v in defaults.iteritems():
+            for cls in [Animal, Fish, Guppy]:
+                self.assertEqual(cls._meta[k], v)
+
+        self.assertFalse('collection' in Animal._meta)
+        self.assertFalse('collection' in Mammal._meta)
+
+        self.assertEqual(Animal._get_collection_name(), None)
+        self.assertEqual(Mammal._get_collection_name(), None)
+
+        self.assertEqual(Fish._get_collection_name(), 'fish')
+        self.assertEqual(Guppy._get_collection_name(), 'fish')
+        self.assertEqual(Human._get_collection_name(), 'human')
+
+        # ensure that a subclass of a non-abstract class can't be abstract
+        with self.assertRaises(ValueError):
+            class EvilHuman(Human):
+                evil = BooleanField(default=True)
+                meta = {'abstract': True}
+
+    def test_abstract_embedded_documents(self):
+        # 789: EmbeddedDocument shouldn't inherit abstract
+        class A(EmbeddedDocument):
+            meta = {"abstract": True}
+
+        class B(A):
+            pass
+
+        self.assertFalse(B._meta["abstract"])
+
+    def test_inherited_collections(self):
+        """Ensure that subclassed documents don't override parents'
+        collections
+        """
+
+        class Drink(Document):
+            name = StringField()
+            meta = {'allow_inheritance': True}
+
+        class Drinker(Document):
+            drink = GenericReferenceField()
+
+        try:
+            warnings.simplefilter("error")
+
+            class AcloholicDrink(Drink):
+                meta = {'collection': 'booze'}
+
+        except SyntaxWarning:
+            warnings.simplefilter("ignore")
+
+            class AlcoholicDrink(Drink):
+                meta = {'collection': 'booze'}
+
+        else:
+            raise AssertionError("SyntaxWarning should be triggered")
+
+        warnings.resetwarnings()
+
+        Drink.drop_collection()
+        AlcoholicDrink.drop_collection()
+        Drinker.drop_collection()
+
+        red_bull = Drink(name='Red Bull')
+        red_bull.save()
+
+        programmer = Drinker(drink=red_bull)
+        programmer.save()
+
+        beer = AlcoholicDrink(name='Beer')
+        beer.save()
+        real_person = Drinker(drink=beer)
+        real_person.save()
+
+        self.assertEqual(Drinker.objects[0].drink.name, red_bull.name)
+        self.assertEqual(Drinker.objects[1].drink.name, beer.name)
+
+
+if __name__ == '__main__':
+    unittest.main()
--- a/tests/document/instance.py
+++ b/tests/document/instance.py
--- a/tests/document/test_json_serialisation.py
+++ b/tests/document/test_json_serialisation.py
@ -1,14 +1,22 @@
 import unittest
 import uuid
-from datetime import datetime

+from nose.plugins.skip import SkipTest
+from datetime import datetime
 from bson import ObjectId

+import pymongo
+
 from mongoengine import *
-from tests.utils import MongoDBTestCase
+
+__all__ = ("TestJson",)


-class TestJson(MongoDBTestCase):
+class TestJson(unittest.TestCase):
+
+    def setUp(self):
+        connect(db='mongoenginetest')
+
    def test_json_names(self):
        """
        Going to test reported issue:
@ -17,24 +25,22 @@ class TestJson(MongoDBTestCase):
        a to_json with the original class names and not the abreviated
        mongodb document keys
        """
-
        class Embedded(EmbeddedDocument):
-            string = StringField(db_field="s")
+            string = StringField(db_field='s')

        class Doc(Document):
-            string = StringField(db_field="s")
-            embedded = EmbeddedDocumentField(Embedded, db_field="e")
+            string = StringField(db_field='s')
+            embedded = EmbeddedDocumentField(Embedded, db_field='e')

-        doc = Doc(string="Hello", embedded=Embedded(string="Inner Hello"))
-        doc_json = doc.to_json(
-            sort_keys=True, use_db_field=False, separators=(",", ":")
-        )
+        doc = Doc( string="Hello", embedded=Embedded(string="Inner Hello"))
+        doc_json = doc.to_json(sort_keys=True, use_db_field=False,separators=(',', ':'))

        expected_json = """{"embedded":{"string":"Inner Hello"},"string":"Hello"}"""

-        assert doc_json == expected_json
+        self.assertEqual( doc_json, expected_json)

    def test_json_simple(self):
+
        class Embedded(EmbeddedDocument):
            string = StringField()

@ -43,20 +49,22 @@ class TestJson(MongoDBTestCase):
            embedded_field = EmbeddedDocumentField(Embedded)

            def __eq__(self, other):
-                return (
-                    self.string == other.string
-                    and self.embedded_field == other.embedded_field
-                )
+                return (self.string == other.string and
+                        self.embedded_field == other.embedded_field)

        doc = Doc(string="Hi", embedded_field=Embedded(string="Hi"))

-        doc_json = doc.to_json(sort_keys=True, separators=(",", ":"))
+        doc_json = doc.to_json(sort_keys=True, separators=(',', ':'))
        expected_json = """{"embedded_field":{"string":"Hi"},"string":"Hi"}"""
-        assert doc_json == expected_json
+        self.assertEqual(doc_json, expected_json)

-        assert doc == Doc.from_json(doc.to_json())
+        self.assertEqual(doc, Doc.from_json(doc.to_json()))

    def test_json_complex(self):
+
+        if pymongo.version_tuple[0] <= 2 and pymongo.version_tuple[1] <= 3:
+            raise SkipTest("Need pymongo 2.4 as has a fix for DBRefs")
+
        class EmbeddedDoc(EmbeddedDocument):
            pass

@ -64,43 +72,41 @@ class TestJson(MongoDBTestCase):
            pass

        class Doc(Document):
-            string_field = StringField(default="1")
+            string_field = StringField(default='1')
            int_field = IntField(default=1)
            float_field = FloatField(default=1.1)
            boolean_field = BooleanField(default=True)
            datetime_field = DateTimeField(default=datetime.now)
-            embedded_document_field = EmbeddedDocumentField(
-                EmbeddedDoc, default=lambda: EmbeddedDoc()
-            )
+            embedded_document_field = EmbeddedDocumentField(EmbeddedDoc,
+                                        default=lambda: EmbeddedDoc())
            list_field = ListField(default=lambda: [1, 2, 3])
            dict_field = DictField(default=lambda: {"hello": "world"})
            objectid_field = ObjectIdField(default=ObjectId)
-            reference_field = ReferenceField(Simple, default=lambda: Simple().save())
+            reference_field = ReferenceField(Simple, default=lambda:
+                                                        Simple().save())
            map_field = MapField(IntField(), default=lambda: {"simple": 1})
            decimal_field = DecimalField(default=1.0)
            complex_datetime_field = ComplexDateTimeField(default=datetime.now)
            url_field = URLField(default="http://mongoengine.org")
            dynamic_field = DynamicField(default=1)
            generic_reference_field = GenericReferenceField(
-                default=lambda: Simple().save()
-            )
-            sorted_list_field = SortedListField(IntField(), default=lambda: [1, 2, 3])
+                                            default=lambda: Simple().save())
+            sorted_list_field = SortedListField(IntField(),
+                                                default=lambda: [1, 2, 3])
            email_field = EmailField(default="ross@example.com")
            geo_point_field = GeoPointField(default=lambda: [1, 2])
            sequence_field = SequenceField()
            uuid_field = UUIDField(default=uuid.uuid4)
            generic_embedded_document_field = GenericEmbeddedDocumentField(
-                default=lambda: EmbeddedDoc()
-            )
+                                        default=lambda: EmbeddedDoc())

            def __eq__(self, other):
                import json
-
                return json.loads(self.to_json()) == json.loads(other.to_json())

        doc = Doc()
-        assert doc == Doc.from_json(doc.to_json())
+        self.assertEqual(doc, Doc.from_json(doc.to_json()))


-if __name__ == "__main__":
+if __name__ == '__main__':
    unittest.main()
--- a/tests/document/test_class_methods.py
+++ b/tests/document/test_class_methods.py
@ -1,349 +0,0 @@
-import unittest
-
-from mongoengine import *
-from mongoengine.connection import get_db
-from mongoengine.pymongo_support import list_collection_names
-from mongoengine.queryset import NULLIFY, PULL
-
-
-class TestClassMethods(unittest.TestCase):
-    def setUp(self):
-        connect(db="mongoenginetest")
-        self.db = get_db()
-
-        class Person(Document):
-            name = StringField()
-            age = IntField()
-
-            non_field = True
-
-            meta = {"allow_inheritance": True}
-
-        self.Person = Person
-
-    def tearDown(self):
-        for collection in list_collection_names(self.db):
-            self.db.drop_collection(collection)
-
-    def test_definition(self):
-        """Ensure that document may be defined using fields."""
-        assert ["_cls", "age", "id", "name"] == sorted(self.Person._fields.keys())
-        assert ["IntField", "ObjectIdField", "StringField", "StringField"] == sorted(
-            x.__class__.__name__ for x in self.Person._fields.values()
-        )
-
-    def test_get_db(self):
-        """Ensure that get_db returns the expected db."""
-        db = self.Person._get_db()
-        assert self.db == db
-
-    def test_get_collection_name(self):
-        """Ensure that get_collection_name returns the expected collection
-        name.
-        """
-        collection_name = "person"
-        assert collection_name == self.Person._get_collection_name()
-
-    def test_get_collection(self):
-        """Ensure that get_collection returns the expected collection."""
-        collection_name = "person"
-        collection = self.Person._get_collection()
-        assert self.db[collection_name] == collection
-
-    def test_drop_collection(self):
-        """Ensure that the collection may be dropped from the database."""
-        collection_name = "person"
-        self.Person(name="Test").save()
-        assert collection_name in list_collection_names(self.db)
-
-        self.Person.drop_collection()
-        assert collection_name not in list_collection_names(self.db)
-
-    def test_register_delete_rule(self):
-        """Ensure that register delete rule adds a delete rule to the document
-        meta.
-        """
-
-        class Job(Document):
-            employee = ReferenceField(self.Person)
-
-        assert self.Person._meta.get("delete_rules") is None
-
-        self.Person.register_delete_rule(Job, "employee", NULLIFY)
-        assert self.Person._meta["delete_rules"] == {(Job, "employee"): NULLIFY}
-
-    def test_compare_indexes(self):
-        """Ensure that the indexes are properly created and that
-        compare_indexes identifies the missing/extra indexes
-        """
-
-        class BlogPost(Document):
-            author = StringField()
-            title = StringField()
-            description = StringField()
-            tags = StringField()
-
-            meta = {"indexes": [("author", "title")]}
-
-        BlogPost.drop_collection()
-
-        BlogPost.ensure_indexes()
-        assert BlogPost.compare_indexes() == {"missing": [], "extra": []}
-
-        BlogPost.ensure_index(["author", "description"])
-        assert BlogPost.compare_indexes() == {
-            "missing": [],
-            "extra": [[("author", 1), ("description", 1)]],
-        }
-
-        BlogPost._get_collection().drop_index("author_1_description_1")
-        assert BlogPost.compare_indexes() == {"missing": [], "extra": []}
-
-        BlogPost._get_collection().drop_index("author_1_title_1")
-        assert BlogPost.compare_indexes() == {
-            "missing": [[("author", 1), ("title", 1)]],
-            "extra": [],
-        }
-
-    def test_compare_indexes_inheritance(self):
-        """Ensure that the indexes are properly created and that
-        compare_indexes identifies the missing/extra indexes for subclassed
-        documents (_cls included)
-        """
-
-        class BlogPost(Document):
-            author = StringField()
-            title = StringField()
-            description = StringField()
-
-            meta = {"allow_inheritance": True}
-
-        class BlogPostWithTags(BlogPost):
-            tags = StringField()
-            tag_list = ListField(StringField())
-
-            meta = {"indexes": [("author", "tags")]}
-
-        BlogPost.drop_collection()
-
-        BlogPost.ensure_indexes()
-        BlogPostWithTags.ensure_indexes()
-        assert BlogPost.compare_indexes() == {"missing": [], "extra": []}
-
-        BlogPostWithTags.ensure_index(["author", "tag_list"])
-        assert BlogPost.compare_indexes() == {
-            "missing": [],
-            "extra": [[("_cls", 1), ("author", 1), ("tag_list", 1)]],
-        }
-
-        BlogPostWithTags._get_collection().drop_index("_cls_1_author_1_tag_list_1")
-        assert BlogPost.compare_indexes() == {"missing": [], "extra": []}
-
-        BlogPostWithTags._get_collection().drop_index("_cls_1_author_1_tags_1")
-        assert BlogPost.compare_indexes() == {
-            "missing": [[("_cls", 1), ("author", 1), ("tags", 1)]],
-            "extra": [],
-        }
-
-    def test_compare_indexes_multiple_subclasses(self):
-        """Ensure that compare_indexes behaves correctly if called from a
-        class, which base class has multiple subclasses
-        """
-
-        class BlogPost(Document):
-            author = StringField()
-            title = StringField()
-            description = StringField()
-
-            meta = {"allow_inheritance": True}
-
-        class BlogPostWithTags(BlogPost):
-            tags = StringField()
-            tag_list = ListField(StringField())
-
-            meta = {"indexes": [("author", "tags")]}
-
-        class BlogPostWithCustomField(BlogPost):
-            custom = DictField()
-
-            meta = {"indexes": [("author", "custom")]}
-
-        BlogPost.ensure_indexes()
-        BlogPostWithTags.ensure_indexes()
-        BlogPostWithCustomField.ensure_indexes()
-
-        assert BlogPost.compare_indexes() == {"missing": [], "extra": []}
-        assert BlogPostWithTags.compare_indexes() == {"missing": [], "extra": []}
-        assert 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": []}
-        assert actual == expected
-
-    def test_list_indexes_inheritance(self):
-        """ensure that all of the indexes are listed regardless of the super-
-        or sub-class that we call it from
-        """
-
-        class BlogPost(Document):
-            author = StringField()
-            title = StringField()
-            description = StringField()
-
-            meta = {"allow_inheritance": True}
-
-        class BlogPostWithTags(BlogPost):
-            tags = StringField()
-
-            meta = {"indexes": [("author", "tags")]}
-
-        class BlogPostWithTagsAndExtraText(BlogPostWithTags):
-            extra_text = StringField()
-
-            meta = {"indexes": [("author", "tags", "extra_text")]}
-
-        BlogPost.drop_collection()
-
-        BlogPost.ensure_indexes()
-        BlogPostWithTags.ensure_indexes()
-        BlogPostWithTagsAndExtraText.ensure_indexes()
-
-        assert BlogPost.list_indexes() == BlogPostWithTags.list_indexes()
-        assert BlogPost.list_indexes() == BlogPostWithTagsAndExtraText.list_indexes()
-        assert BlogPost.list_indexes() == [
-            [("_cls", 1), ("author", 1), ("tags", 1)],
-            [("_cls", 1), ("author", 1), ("tags", 1), ("extra_text", 1)],
-            [("_id", 1)],
-            [("_cls", 1)],
-        ]
-
-    def test_register_delete_rule_inherited(self):
-        class Vaccine(Document):
-            name = StringField(required=True)
-
-            meta = {"indexes": ["name"]}
-
-        class Animal(Document):
-            family = StringField(required=True)
-            vaccine_made = ListField(
-                ReferenceField("Vaccine", reverse_delete_rule=PULL)
-            )
-
-            meta = {"allow_inheritance": True, "indexes": ["family"]}
-
-        class Cat(Animal):
-            name = StringField(required=True)
-
-        assert Vaccine._meta["delete_rules"][(Animal, "vaccine_made")] == PULL
-        assert Vaccine._meta["delete_rules"][(Cat, "vaccine_made")] == PULL
-
-    def test_collection_naming(self):
-        """Ensure that a collection with a specified name may be used."""
-
-        class DefaultNamingTest(Document):
-            pass
-
-        assert "default_naming_test" == DefaultNamingTest._get_collection_name()
-
-        class CustomNamingTest(Document):
-            meta = {"collection": "pimp_my_collection"}
-
-        assert "pimp_my_collection" == CustomNamingTest._get_collection_name()
-
-        class DynamicNamingTest(Document):
-            meta = {"collection": lambda c: "DYNAMO"}
-
-        assert "DYNAMO" == DynamicNamingTest._get_collection_name()
-
-        # Use Abstract class to handle backwards compatibility
-        class BaseDocument(Document):
-            meta = {"abstract": True, "collection": lambda c: c.__name__.lower()}
-
-        class OldNamingConvention(BaseDocument):
-            pass
-
-        assert "oldnamingconvention" == OldNamingConvention._get_collection_name()
-
-        class InheritedAbstractNamingTest(BaseDocument):
-            meta = {"collection": "wibble"}
-
-        assert "wibble" == InheritedAbstractNamingTest._get_collection_name()
-
-        # Mixin tests
-        class BaseMixin:
-            meta = {"collection": lambda c: c.__name__.lower()}
-
-        class OldMixinNamingConvention(Document, BaseMixin):
-            pass
-
-        assert (
-            "oldmixinnamingconvention"
-            == OldMixinNamingConvention._get_collection_name()
-        )
-
-        class BaseMixin:
-            meta = {"collection": lambda c: c.__name__.lower()}
-
-        class BaseDocument(Document, BaseMixin):
-            meta = {"allow_inheritance": True}
-
-        class MyDocument(BaseDocument):
-            pass
-
-        assert "basedocument" == MyDocument._get_collection_name()
-
-    def test_custom_collection_name_operations(self):
-        """Ensure that a collection with a specified name is used as expected."""
-        collection_name = "personCollTest"
-
-        class Person(Document):
-            name = StringField()
-            meta = {"collection": collection_name}
-
-        Person(name="Test User").save()
-        assert collection_name in list_collection_names(self.db)
-
-        user_obj = self.db[collection_name].find_one()
-        assert user_obj["name"] == "Test User"
-
-        user_obj = Person.objects[0]
-        assert user_obj.name == "Test User"
-
-        Person.drop_collection()
-        assert collection_name not in list_collection_names(self.db)
-
-    def test_collection_name_and_primary(self):
-        """Ensure that a collection with a specified name may be used."""
-
-        class Person(Document):
-            name = StringField(primary_key=True)
-            meta = {"collection": "app"}
-
-        Person(name="Test User").save()
-
-        user_obj = Person.objects.first()
-        assert user_obj.name == "Test User"
-
-        Person.drop_collection()
-
-
-if __name__ == "__main__":
-    unittest.main()
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Stefan Wojcik	2d9e21f639	one more test	2017-03-05 17:39:53 -05:00
Stefan Wojcik	4631b75553	respect db fields in multiple layers of embedded docs	2017-03-05 17:35:37 -05:00
				`@ -0,0 +1 @@`
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