4. Changelog¶

4.1. Changes in 0.9.X - DEV¶

Update FileField when creating a new file #714
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
Add support for $type operator # 766
Fix tests for pymongo 2.8+ #877
No module named ‘django.utils.importlib’ (Django dev) #872
Field Choices Now Accept Subclasses of Documents
Ensure Indexes before Each Save #812
Generate Unique Indices for Lists of EmbeddedDocuments #358
Sparse fields #515
write_concern not in params of Collection#remove #801
Better BaseDocument equality check when not saved #798
OperationError: Shard Keys are immutable. Tried to update id even though the document is not yet saved #771
with_limit_and_skip for count should default like in pymongo #759
Fix storing value of precision attribute in DecimalField #787
Set attribute to None does not work (at least for fields with default values) #734
Querying by a field defined in a subclass raises InvalidQueryError #744
Add Support For MongoDB 2.6.X’s maxTimeMS #778
abstract shouldn’t be inherited in EmbeddedDocument # 789
Allow specifying the ‘_cls’ as a field for indexes #397
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 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 support for progressive JPEG #486 #548
Allow strings to be used in index creation #675
Fixed EmbeddedDoc weakref proxy issue #592
Fixed nested reference field distinct error #583
Fixed change tracking on nested MapFields #539
Dynamic fields in embedded documents now visible to queryset.only() / qs.exclude() #425 #507
Add authentication_source option to register_connection #178 #464 #573 #580 #590
Implemented equality between Documents and DBRefs #597
Fixed ReferenceField inside nested ListFields dereferencing problem #368
Added the ability to reload specific document fields #100
Added db_alias support and fixes for custom map/reduce output #586
post_save signal now has access to delta information about field changes #594 #589
Don’t query with $orderby for qs.get() #600
Fix id shard key save issue #636
Fixes issue with recursive embedded document errors #557
Fix clear_changed_fields() clearing unsaved documents bug #602
Removing support for Django 1.4.x, pymongo 2.5.x, pymongo 2.6.x.
Removing support for Python < 2.6.6
Fixed $maxDistance location for geoJSON $near queries with MongoDB 2.6+ #664
QuerySet.modify() and Document.modify() methods to provide find_and_modify() like behaviour #677 #773
Added support for the using() method on a queryset #676
PYPY support #673
Connection pooling #674
Avoid to open all documents from cursors in an if stmt #655
Ability to clear the ordering #657
Raise NotUniqueError in Document.update() on pymongo.errors.DuplicateKeyError #626
Slots - memory improvements #625
Fixed incorrectly split a query key when it ends with “_” #619
Geo docs updates #613
Workaround a dateutil bug #608
Conditional save for atomic-style operations #511
Allow dynamic dictionary-style field access #559
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
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
Handle None from model __str__; Fixes #753 #754

4.2. Changes in 0.8.7¶

Calling reload on deleted / nonexistent documents raises DoesNotExist (#538)
Stop ensure_indexes running on a secondaries (#555)
Fix circular import issue with django auth (#531) (#545)

4.3. Changes in 0.8.6¶

Fix django auth import (#531)

4.4. Changes in 0.8.5¶

Fix multi level nested fields getting marked as changed (#523)
Django 1.6 login fix (#522) (#527)
Django 1.6 session fix (#509)
EmbeddedDocument._instance is now set when setting the attribute (#506)
Fixed EmbeddedDocument with ReferenceField equality issue (#502)
Fixed GenericReferenceField serialization order (#499)
Fixed count and none bug (#498)
Fixed bug with .only() and DictField with digit keys (#496)
Added user_permissions to Django User object (#491, #492)
Fix updating Geo Location fields (#488)
Fix handling invalid dict field value (#485)
Added app_label to MongoUser (#484)
Use defaults when host and port are passed as None (#483)
Fixed distinct casting issue with ListField of EmbeddedDocuments (#470)
Fixed Django 1.6 sessions (#454, #480)

4.5. Changes in 0.8.4¶

Remove database name necessity in uri connection schema (#452)
Fixed “$pull” semantics for nested ListFields (#447)
Allow fields to be named the same as query operators (#445)
Updated field filter logic - can now exclude subclass fields (#443)
Fixed dereference issue with embedded listfield referencefields (#439)
Fixed slice when using inheritance causing fields to be excluded (#437)
Fixed ._get_db() attribute after a Document.switch_db() (#441)
Dynamic Fields store and recompose Embedded Documents / Documents correctly (#449)
Handle dynamic fieldnames that look like digits (#434)
Added get_user_document and improve mongo_auth module (#423)
Added str representation of GridFSProxy (#424)
Update transform to handle docs erroneously passed to unset (#416)
Fixed indexing - turn off _cls (#414)
Fixed dereference threading issue in ComplexField.__get__ (#412)
Fixed QuerySetNoCache.count() caching (#410)
Don’t follow references in _get_changed_fields (#422, #417)
Allow args and kwargs to be passed through to_json (#420)

4.6. Changes in 0.8.3¶

Fixed EmbeddedDocuments with id also storing _id (#402)
Added get_proxy_object helper to filefields (#391)
Added QuerySetNoCache and QuerySet.no_cache() for lower memory consumption (#365)
Fixed sum and average mapreduce dot notation support (#375, #376, #393)
Fixed as_pymongo to return the id (#386)
Document.select_related() now respects db_alias (#377)
Reload uses shard_key if applicable (#384)
Dynamic fields are ordered based on creation and stored in _fields_ordered (#396)

Potential breaking change: http://docs.mongoengine.org/en/latest/upgrade.html#to-0-8-3
Fixed pickling dynamic documents _dynamic_fields (#387)
Fixed ListField setslice and delslice dirty tracking (#390)
Added Django 1.5 PY3 support (#392)
Added match ($elemMatch) support for EmbeddedDocuments (#379)
Fixed weakref being valid after reload (#374)
Fixed queryset.get() respecting no_dereference (#373)
Added full_result kwarg to update (#380)

4.7. Changes in 0.8.2¶

Added compare_indexes helper (#361)
Fixed cascading saves which weren’t turned off as planned (#291)
Fixed Datastructures so instances are a Document or EmbeddedDocument (#363)
Improved cascading saves write performance (#361)
Fixed ambiguity and differing behaviour regarding field defaults (#349)
ImageFields now include PIL error messages if invalid error (#353)
Added lock when calling doc.Delete() for when signals have no sender (#350)
Reload forces read preference to be PRIMARY (#355)
Querysets are now lest restrictive when querying duplicate fields (#332, #333)
FileField now honouring db_alias (#341)
Removed customised __set__ change tracking in ComplexBaseField (#344)
Removed unused var in _get_changed_fields (#347)
Added pre_save_post_validation signal (#345)
DateTimeField now auto converts valid datetime isostrings into dates (#343)
DateTimeField now uses dateutil for parsing if available (#343)
Fixed Doc.objects(read_preference=X) not setting read preference (#352)
Django session ttl index expiry fixed (#329)
Fixed pickle.loads (#342)
Documentation fixes

4.8. Changes in 0.8.1¶

Fixed Python 2.6 django auth importlib issue (#326)
Fixed pickle unsaved document regression (#327)

4.9. Changes in 0.8.0¶

Fixed querying ReferenceField custom_id (#317)
Fixed pickle issues with collections (#316)
Added get_next_value preview for SequenceFields (#319)
Added no_sub_classes context manager and queryset helper (#312)
Querysets now utilises a local cache
Changed __len__ behaviour in the queryset (#247, #311)
Fixed querying string versions of ObjectIds issue with ReferenceField (#307)
Added $setOnInsert support for upserts (#308)
Upserts now possible with just query parameters (#309)
Upserting is the only way to ensure docs are saved correctly (#306)
Fixed register_delete_rule inheritance issue
Fix cloning of sliced querysets (#303)
Fixed update_one write concern (#302)
Updated minimum requirement for pymongo to 2.5
Add support for new geojson fields, indexes and queries (#299)
If values cant be compared mark as changed (#287)
Ensure as_pymongo() and to_json honour only() and exclude() (#293)
Document serialization uses field order to ensure a strict order is set (#296)
DecimalField now stores as float not string (#289)
UUIDField now stores as a binary by default (#292)
Added Custom User Model for Django 1.5 (#285)
Cascading saves now default to off (#291)
ReferenceField now store ObjectId’s by default rather than DBRef (#290)
Added ImageField support for inline replacements (#86)
Added SequenceField.set_next_value(value) helper (#159)
Updated .only() behaviour - now like exclude it is chainable (#202)
Added with_limit_and_skip support to count() (#235)
Objects queryset manager now inherited (#256)
Updated connection to use MongoClient (#262, #274)
Fixed db_alias and inherited Documents (#143)
Documentation update for document errors (#124)
Deprecated get_or_create (#35)
Updated inheritable objects created by upsert now contain _cls (#118)
Added support for creating documents with embedded documents in a single operation (#6)
Added to_json and from_json to Document (#1)
Added to_json and from_json to QuerySet (#131)
Updated index creation now tied to Document class (#102)
Added none() to queryset (#127)
Updated SequenceFields to allow post processing of the calculated counter value (#141)
Added clean method to documents for pre validation data cleaning (#60)
Added support setting for read prefrence at a query level (#157)
Added _instance to EmbeddedDocuments pointing to the parent (#139)
Inheritance is off by default (#122)
Remove _types and just use _cls for inheritance (#148)
Only allow QNode instances to be passed as query objects (#199)
Dynamic fields are now validated on save (#153) (#154)
Added support for multiple slices and made slicing chainable. (#170) (#190) (#191)
Fixed GridFSProxy __getattr__ behaviour (#196)
Fix Django timezone support (#151)
Simplified Q objects, removed QueryTreeTransformerVisitor (#98) (#171)
FileFields now copyable (#198)
Querysets now return clones and are no longer edit in place (#56)
Added support for $maxDistance (#179)
Uses getlasterror to test created on updated saves (#163)
Fixed inheritance and unique index creation (#140)
Fixed reverse delete rule with inheritance (#197)
Fixed validation for GenericReferences which haven’t been dereferenced
Added switch_db context manager (#106)
Added switch_db method to document instances (#106)
Added no_dereference context manager (#82) (#61)
Added switch_collection context manager (#220)
Added switch_collection method to document instances (#220)
Added support for compound primary keys (#149) (#121)
Fixed overriding objects with custom manager (#58)
Added no_dereference method for querysets (#82) (#61)
Undefined data should not override instance methods (#49)
Added Django Group and Permission (#142)
Added Doc class and pk to Validation messages (#69)
Fixed Documents deleted via a queryset don’t call any signals (#105)
Added the “get_decoded” method to the MongoSession class (#216)
Fixed invalid choices error bubbling (#214)
Updated Save so it calls $set and $unset in a single operation (#211)
Fixed inner queryset looping (#204)

4.10. Changes in 0.7.10¶

Fix UnicodeEncodeError for dbref (#278)
Allow construction using positional parameters (#268)
Updated EmailField length to support long domains (#243)
Added 64-bit integer support (#251)
Added Django sessions TTL support (#224)
Fixed issue with numerical keys in MapField(EmbeddedDocumentField()) (#240)
Fixed clearing _changed_fields for complex nested embedded documents (#237, #239, #242)
Added “id” back to _data dictionary (#255)
Only mark a field as changed if the value has changed (#258)
Explicitly check for Document instances when dereferencing (#261)
Fixed order_by chaining issue (#265)
Added dereference support for tuples (#250)
Resolve field name to db field name when using distinct(#260, #264, #269)
Added kwargs to doc.save to help interop with django (#223, #270)
Fixed cloning querysets in PY3
Int fields no longer unset in save when changed to 0 (#272)
Fixed ReferenceField query chaining bug fixed (#254)

4.11. Changes in 0.7.9¶

Better fix handling for old style _types
Embedded SequenceFields follow collection naming convention

4.12. Changes in 0.7.8¶

Fix sequence fields in embedded documents (#166)
Fix query chaining with .order_by() (#176)
Added optional encoding and collection config for Django sessions (#180, #181, #183)
Fixed EmailField so can add extra validation (#173, #174, #187)
Fixed bulk inserts can now handle custom pk’s (#192)
Added as_pymongo method to return raw or cast results from pymongo (#193)

4.13. Changes in 0.7.7¶

Fix handling for old style _types

4.14. Changes in 0.7.6¶

Unicode fix for repr (#133)
Allow updates with match operators (#144)
Updated URLField - now can have a override the regex (#136)
Allow Django AuthenticationBackends to work with Django user (hmarr/mongoengine#573)
Fixed reload issue with ReferenceField where dbref=False (#138)

4.15. Changes in 0.7.5¶

ReferenceFields with dbref=False use ObjectId instead of strings (#134) See ticket for upgrade notes (#134)

4.16. Changes in 0.7.4¶

Fixed index inheritance issues - firmed up testcases (#123) (#125)

4.17. Changes in 0.7.3¶

Reverted EmbeddedDocuments meta handling - now can turn off inheritance (#119)

4.18. Changes in 0.7.2¶

Update index spec generation so its not destructive (#113)

4.19. Changes in 0.7.1¶

Fixed index spec inheritance (#111)

4.20. Changes in 0.7.0¶

Updated queryset.delete so you can use with skip / limit (#107)
Updated index creation allows kwargs to be passed through refs (#104)
Fixed Q object merge edge case (#109)
Fixed reloading on sharded documents (hmarr/mongoengine#569)
Added NotUniqueError for duplicate keys (#62)
Added custom collection / sequence naming for SequenceFields (#92)
Fixed UnboundLocalError in composite index with pk field (#88)
Updated ReferenceField’s to optionally store ObjectId strings this will become the default in 0.8 (#89)
Added FutureWarning - save will default to cascade=False in 0.8
Added example of indexing embedded document fields (#75)
Fixed ImageField resizing when forcing size (#80)
Add flexibility for fields handling bad data (#78)
Embedded Documents no longer handle meta definitions
Use weakref proxies in base lists / dicts (#74)
Improved queryset filtering (hmarr/mongoengine#554)
Fixed Dynamic Documents and Embedded Documents (hmarr/mongoengine#561)
Fixed abstract classes and shard keys (#64)
Fixed Python 2.5 support
Added Python 3 support (thanks to Laine Heron)

4.21. Changes in 0.6.20¶

Added support for distinct and db_alias (#59)
Improved support for chained querysets when constraining the same fields (hmarr/mongoengine#554)
Fixed BinaryField lookup re (#48)

4.22. Changes in 0.6.19¶

Added Binary support to UUID (#47)
Fixed MapField lookup for fields without declared lookups (#46)
Fixed BinaryField python value issue (#48)
Fixed SequenceField non numeric value lookup (#41)
Fixed queryset manager issue (#52)
Fixed FileField comparision (hmarr/mongoengine#547)

4.23. Changes in 0.6.18¶

Fixed recursion loading bug in _get_changed_fields

4.24. Changes in 0.6.17¶

Fixed issue with custom queryset manager expecting explict variable names

4.25. Changes in 0.6.16¶

Fixed issue where db_alias wasn’t inherited

4.26. Changes in 0.6.15¶

Updated validation error messages
Added support for null / zero / false values in item_frequencies
Fixed cascade save edge case
Fixed geo index creation through reference fields
Added support for args / kwargs when using @queryset_manager
Deref list custom id fix

4.27. Changes in 0.6.14¶

Fixed error dict with nested validation
Fixed Int/Float fields and not equals None
Exclude tests from installation
Allow tuples for index meta
Fixed use of str in instance checks
Fixed unicode support in transform update
Added support for add_to_set and each

4.28. Changes in 0.6.13¶

Fixed EmbeddedDocument db_field validation issue
Fixed StringField unicode issue
Fixes __repr__ modifying the cursor

4.29. Changes in 0.6.12¶

Fixes scalar lookups for primary_key
Fixes error with _delta handling DBRefs

4.30. Changes in 0.6.11¶

Fixed inconsistency handling None values field attrs
Fixed map_field embedded db_field issue
Fixed .save() _delta issue with DbRefs
Fixed Django TestCase
Added cmp to Embedded Document
Added PULL reverse_delete_rule
Fixed CASCADE delete bug
Fixed db_field data load error
Fixed recursive save with FileField

4.31. Changes in 0.6.10¶

Fixed basedict / baselist to return super(..)
Promoted BaseDynamicField to DynamicField

4.32. Changes in 0.6.9¶

Fixed sparse indexes on inherited docs
Removed FileField auto deletion, needs more work maybe 0.7

4.33. Changes in 0.6.8¶

Fixed FileField losing reference when no default set
Removed possible race condition from FileField (grid_file)
Added assignment to save, can now do: b = MyDoc(**kwargs).save()
Added support for pull operations on nested EmbeddedDocuments
Added support for choices with GenericReferenceFields
Added support for choices with GenericEmbeddedDocumentFields
Fixed Django 1.4 sessions first save data loss
FileField now automatically delete files on .delete()
Fix for GenericReference to_mongo method
Fixed connection regression
Updated Django User document, now allows inheritance

4.34. Changes in 0.6.7¶

Fixed indexing on ‘_id’ or ‘pk’ or ‘id’
Invalid data from the DB now raises a InvalidDocumentError
Cleaned up the Validation Error - docs and code
Added meta auto_create_index so you can disable index creation
Added write concern options to inserts
Fixed typo in meta for index options
Bug fix Read preference now passed correctly
Added support for File like objects for GridFS
Fix for #473 - Dereferencing abstracts

4.35. Changes in 0.6.6¶

Django 1.4 fixed (finally)
Added tests for Django

4.36. Changes in 0.6.5¶

More Django updates

4.37. Changes in 0.6.4¶

Refactored connection / fixed replicasetconnection
Bug fix for unknown connection alias error message
Sessions support Django 1.3 and Django 1.4
Minor fix for ReferenceField

4.38. Changes in 0.6.3¶

Updated sessions for Django 1.4
Bug fix for updates where listfields contain embedded documents
Bug fix for collection naming and mixins

4.39. Changes in 0.6.2¶

Updated documentation for ReplicaSet connections
Hack round _types issue with SERVER-5247 - querying other arrays may also cause problems.

4.40. Changes in 0.6.1¶

Fix for replicaSet connections

4.41. Changes in 0.6¶

Added FutureWarning to inherited classes not declaring ‘allow_inheritance’ as the default will change in 0.7
Added support for covered indexes when inheritance is off
No longer always upsert on save for items with a ‘_id’
Error raised if update doesn’t have an operation
DeReferencing is now thread safe
Errors raised if trying to perform a join in a query
Updates can now take __raw__ queries
Added custom 2D index declarations
Added replicaSet connection support
Updated deprecated imports from pymongo (safe for pymongo 2.2)
Added uri support for connections
Added scalar for efficiently returning partial data values (aliased to values_list)
Fixed limit skip bug
Improved Inheritance / Mixin
Added sharding support
Added pymongo 2.1 support
Fixed Abstract documents can now declare indexes
Added db_alias support to individual documents
Fixed GridFS documents can now be pickled
Added Now raises an InvalidDocumentError when declaring multiple fields with the same db_field
Added InvalidQueryError when calling with_id with a filter
Added support for DBRefs in distinct()
Fixed issue saving False booleans
Fixed issue with dynamic documents deltas
Added Reverse Delete Rule support to ListFields - MapFields aren’t supported
Added customisable cascade kwarg options
Fixed Handle None values for non-required fields
Removed Document._get_subclasses() - no longer required
Fixed bug requiring subclasses when not actually needed
Fixed deletion of dynamic data
Added support for the $elementMatch operator
Added reverse option to SortedListFields
Fixed dereferencing - multi directional list dereferencing
Fixed issue creating indexes with recursive embedded documents
Fixed recursive lookup in _unique_with_indexes
Fixed passing ComplexField defaults to constructor for ReferenceFields
Fixed validation of DictField Int keys
Added optional cascade saving
Fixed dereferencing - max_depth now taken into account
Fixed document mutation saving issue
Fixed positional operator when replacing embedded documents
Added Non-Django Style choices back (you can have either)
Fixed __repr__ of a sliced queryset
Added recursive validation error of documents / complex fields
Fixed breaking during queryset iteration
Added pre and post bulk-insert signals
Added ImageField - requires PIL
Fixed Reference Fields can be None in get_or_create / queries
Fixed accessing pk on an embedded document
Fixed calling a queryset after drop_collection now recreates the collection
Add field name to validation exception messages
Added UUID field
Improved efficiency of .get()
Updated ComplexFields so if required they won’t accept empty lists / dicts
Added spec file for rpm-based distributions
Fixed ListField so it doesnt accept strings
Added DynamicDocument and EmbeddedDynamicDocument classes for expando schemas

4.42. Changes in v0.5.2¶

A Robust Circular reference bugfix

4.43. Changes in v0.5.1¶

Fixed simple circular reference bug

4.44. Changes in v0.5¶

Added InvalidDocumentError - so Document core methods can’t be overwritten
Added GenericEmbeddedDocument - so you can embed any type of embeddable document
Added within_polygon support - for those with mongodb 1.9
Updated sum / average to use map_reduce as db.eval doesn’t work in sharded environments
Added where() - filter to allowing users to specify query expressions as Javascript
Added SequenceField - for creating sequential counters
Added update() convenience method to a document
Added cascading saves - so changes to Referenced documents are saved on .save()
Added select_related() support
Added support for the positional operator
Updated geo index checking to be recursive and check in embedded documents
Updated default collection naming convention
Added Document Mixin support
Fixed queryet __repr__ mid iteration
Added hint() support, so 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

4.45. Changes in v0.4¶

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

4.46. Changes in v0.3¶

Added MapReduce support
Added contains, startswith and endswith query operators (and case-insensitive versions that are prefixed with ‘i’)
Deprecated fields’ name parameter, replaced with db_field
Added QuerySet.only for only retrieving specific fields
Added QuerySet.in_bulk() for bulk querying using ids
QuerySets now have a rewind() method, which is called automatically when the iterator is exhausted, allowing QuerySets to be reused
Added DictField
Added URLField
Added DecimalField
Added BinaryField
Added GenericReferenceField
Added get() and get_or_create() methods to QuerySet
ReferenceFields 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
ReferenceFields 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

4.47. Changes in v0.2.2¶

Fixed bug that prevented indexes from being used on ListFields
Document.filter() added as an alias to Document.__call__()
validate() may now be used on EmbeddedDocuments

4.48. Changes in v0.2.1¶

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)

4.49. Changes in v0.2¶

Added Q class for building advanced queries
Added QuerySet methods for atomic updates to documents
Fields may now specify unique=True to enforce uniqueness across a collection
Added option for default document ordering
Fixed bug in index definitions

4.50. Changes in v0.1.3¶

Added Django authentication backend
Added Document.meta support for indexes, which are ensured just before querying takes place
A few minor bugfixes

4.51. Changes in v0.1.2¶

Query values may be processed before before being used in queries
Made connections lazy
Fixed bug in Document dictionary-style access
Added BooleanField
Added Document.reload() method

4.52. Changes in v0.1.1¶

Documents may now use capped collections