Mongoengine

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- Fixed simple circular reference bug

===============

- Added InvalidDocumentError - so Document core methods can't be overwritten
- Added GenericEmbeddedDocument - so you can embed any type of embeddable document
- Added within_polygon support - for those with mongodb 1.9
- Updated sum / average to use map_reduce as db.eval doesn't work in sharded environments
- Added where() - filter to allowing users to specify query expressions as Javascript
- Added SequenceField - for creating sequential counters
- Added update() convenience method to a document
- Added cascading saves - so changes to Referenced documents are saved on .save()
- Added select_related() support
- Added support for the positional operator
- Updated geo index checking to be recursive and check in embedded documents
- Updated default collection naming convention
- Added Document Mixin support
- Fixed queryet __repr__ mid iteration
- Added hint() support, so can tell Mongo the proper index to use for the query
- Fixed issue with inconsistent setting of _cls breaking inherited referencing
- Added help_text and verbose_name to fields to help with some form libs
- Updated item_frequencies to handle embedded document lookups
- Added delta tracking now only sets / unsets explicitly changed fields
- Fixed saving so sets updated values rather than overwrites
- Added ComplexDateTimeField - Handles datetimes correctly with microseconds
- Added ComplexBaseField - for improved flexibility and performance
- Added get_FIELD_display() method for easy choice field displaying
- Added queryset.slave_okay(enabled) method
- Updated queryset.timeout(enabled) and queryset.snapshot(enabled) to be chainable
- Added insert method for bulk inserts
- Added blinker signal support
- Added query_counter context manager for tests
- Added map_reduce method item_frequencies and set as default (as db.eval doesn't work in sharded environments)
- Added inline_map_reduce option to map_reduce
- Updated connection exception so it provides more info on the cause.
- Added searching multiple levels deep in ``DictField``
- Added ``DictField`` entries containing strings to use matching operators
- Added ``MapField``, similar to ``DictField``
- Added Abstract Base Classes
- Added Custom Objects Managers
- Added sliced subfields updating
- Added ``NotRegistered`` exception if dereferencing ``Document`` not in the registry
- Added a write concern for ``save``, ``update``, ``update_one`` and ``get_or_create``
- Added slicing / subarray fetching controls
- Fixed various unique index and other index issues
- Fixed threaded connection issues
- Added spherical geospatial query operators
- Updated queryset to handle latest version of pymongo
map_reduce now requires an output.
- Added ``Document`` __hash__, __ne__ for pickling
- Added ``FileField`` optional size arg for read method
- Fixed ``FileField`` seek and tell methods for reading files
- Added ``QuerySet.clone`` to support copying querysets
- Fixed item_frequencies when using name thats the same as a native js function
- Added reverse delete rules
- Fixed issue with unset operation
- Fixed Q-object bug
- Added ``QuerySet.all_fields`` resets previous .only() and .exclude()
- Added ``QuerySet.exclude``
- Added django style choices
- Fixed order and filter issue
- Added ``QuerySet.only`` subfield support
- Added creation_counter to ``BaseField`` allowing fields to be sorted in the
way the user has specified them
- Fixed various errors
- Added many tests

===============
- Added ``GridFSStorage`` Django storage backend
- Added ``FileField`` for GridFS support
- New Q-object implementation, which is no longer based on Javascript
- Added ``SortedListField``
- Added ``EmailField``
- Added ``GeoPointField``
- Added ``exact`` and ``iexact`` match operators to ``QuerySet``
- Added ``get_document_or_404`` and ``get_list_or_404`` Django shortcuts
- Added new query operators for Geo queries
- Added ``not`` query operator
- Added new update operators: ``pop`` and ``add_to_set``
- Added ``__raw__`` query parameter
- Added support for custom querysets
- Fixed document inheritance primary key issue
- Added support for querying by array element position
- Base class can now be defined for ``DictField``
- Fixed MRO error that occured on document inheritance
- Added ``QuerySet.distinct``, ``QuerySet.create``, ``QuerySet.snapshot``,
``QuerySet.timeout`` and ``QuerySet.all``
- Subsequent calls to ``connect()`` now work
- Introduced ``min_length`` for ``StringField``
- Fixed multi-process connection issue
- Other minor fixes

===============
- Added MapReduce support
- Added ``contains``, ``startswith`` and ``endswith`` query operators (and
case-insensitive versions that are prefixed with 'i')
- Deprecated fields' ``name`` parameter, replaced with ``db_field``
- Added ``QuerySet.only`` for only retrieving specific fields
- Added ``QuerySet.in_bulk()`` for bulk querying using ids
- ``QuerySet``\ s now have a ``rewind()`` method, which is called automatically
when the iterator is exhausted, allowing ``QuerySet``\ s to be reused
- Added ``DictField``
- Added ``URLField``
- Added ``DecimalField``
- Added ``BinaryField``
- Added ``GenericReferenceField``
- Added ``get()`` and ``get_or_create()`` methods to ``QuerySet``
- ``ReferenceField``\ s may now reference the document they are defined on
(recursive references) and documents that have not yet been defined
- ``Document`` objects may now be compared for equality (equal if _ids are
equal and documents are of same type)
- ``QuerySet`` update methods now have an ``upsert`` parameter
- Added field name substitution for Javascript code (allows the user to use the
Python names for fields in JS, which are later substituted for the real field
names)
- ``Q`` objects now support regex querying
- Fixed bug where referenced documents within lists weren't properly
dereferenced
- ``ReferenceField``\ s may now be queried using their _id
- Fixed bug where ``EmbeddedDocuments`` couldn't be non-polymorphic
- ``queryset_manager`` functions now accept two arguments -- the document class
as the first and the queryset as the second
- Fixed bug where ``QuerySet.exec_js`` ignored ``Q`` objects
- Other minor fixes

=================
- Fixed bug that prevented indexes from being used on ``ListField``\ s
- ``Document.filter()`` added as an alias to ``Document.__call__()``
- ``validate()`` may now be used on ``EmbeddedDocument``\ s

=================
- Added a MongoEngine backend for Django sessions
- Added ``force_insert`` to ``Document.save()``
- Improved querying syntax for ``ListField`` and ``EmbeddedDocumentField``
- Added support for user-defined primary keys (``_id`` in MongoDB)