MongoKit framework try to keep its simplicity when you manage mongodb in python. MongoKit was developed to be fast and light with KISS and DRY in mind. MongoKit brings structured schema and validation layer on top of the great pymongo driver. Discuss with us on Google group : or follow the news on Twitter: h…
Pull request Compare This branch is 177 commits behind namlook:master.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Failed to load latest commit information.



MongoDB is a great schema-less document oriented database. It have a lot of driver for many langages (python, ruby, perl, java, php...).

MongoKit is a python module that brings structured schema and validation layer on top of the great pymongo driver. It has be written to be as simple and light as possible with the KISS and DRY principles in mind.


MongoKit is designed to be:

  • simple: MongoKit use plain python type to describe document structure
  • fast: MongoKit is fast but if you really need to be fast you have access to the raw pymongo layer without changing the API
  • powerful: MongoKit brings many feature like document auto-reference, custom types or i18n support.

Your data is clean:

"Tools change, not data". In order to follow this "credo", MongoKit won't add any information into your data saved into the database. So if you need to use other mongo tools or ODMs in other languages, your data won't be polluted by MongoKit's stuff.


  • schema validation (wich use simple python type for the declaration)
  • schema less feature
  • dot notation
  • nested and complex schema declaration
  • untyped field support
  • required fields validation
  • default values
  • custom validators
  • cross database document reference
  • random query support (which returns a random document from the database)
  • inheritance and polymorphisme support
  • versionized document support (in beta stage)
  • partial auth support (it brings a simple User model)
  • operator for validation (currently : OR, NOT and IS)
  • simple web framework integration
  • import/export to json
  • i18n support
  • GridFS support
  • document migration support

Go to the full documentation .

A quick example

Document are enhanced python dictionary with a validate() method. A Document declaration look like that:

>>> from mongokit import *
>>> import datetime

>>> connection = Connection()

>>> @connection.register
... class BlogPost(Document):
...     structure = {
...             'title':unicode,
...             'body':unicode,
...             'author':unicode,
...             'date_creation':datetime.datetime,
...             'rank':int
...     }
...     required_fields = ['title','author', 'date_creation']
...     default_values = {'rank':0, 'date_creation':datetime.datetime.utcnow}

We fire a connection and register our objects.

>>> blogpost = con.test.example.BlogPost() # this use the db "test" and the collection "example"
>>> blogpost['title'] = u'my title'
>>> blogpost['body'] = u'a body'
>>> blogpost['author'] = u'me'
>>> blogpost
{'body': u'a body', 'title': u'my title', 'date_creation': datetime.datetime(...), 'rank': 0, 'author': u'me'}

Saving the object will call the validate() method.

And you can use more complex structure:

>>>  @connection.register
...  class ComplexDoc(Document):
...     __database__ = 'test'
...     __collection__ = 'example'
...     structure = {
...         "foo" : {"content":int},
...         "bar" : {
...             'bla':{'spam':int}
...         }
...     }
...     required_fields = ['foo.content', 'bar.bla.spam']

Please, see the tutorial for more examples.

Suggestion and patches are really welcome. If you find mistakes in the documentation (english is not my primary langage) feel free to contact me. You can find me (namlook) on the freenode #mongodb irc channel or on twitter.

Recent Change Log


  • allow keyword arguments (like read_preferences, slave_okay, etc) to be set in Connection (thanks to @petersng)
  • Add find_and_modify again. It was removed by an unexpected rollback.
  • use MongoClient with MasterSlaveConnection


  • fix #101 - validators condition fix
  • fix #110 - support PyMongo >= 2.4 (import MongoClient) -- thanks to @mattbodman and @zavatskiy
  • Fixed some spelling/grammar (thanks to @gekitsuu)


  • support python 2.3
  • small updates to validation messages (Merge pull request #94 from unpluggd/master)
  • Fixes formatting error when throwing MaxDocumentSizeError in Document.validate() (Merge pull request #99 from apavlo/master)
  • Fixed typo when throwing MaxDocumentSizeError in validate() (thanks to Andy Pavlo)
  • added fix for unconditional access to __wrap on cursors (thanks to David T. Lehmann)
  • added test for __getitem__ on cursor with undefined __wrap (thanks to David T. Lehmann)
  • __getitem__ on unwrapped cursor checkes if __wrap is None (Merge pull request #97 from dtl/fix-getitem-on-unwrapped-cursor)
  • Add .travis.yml for Travis CI ( (Merge pull request #96 from msabramo/travis)
  • Fixed a very minor rendering issue in the docs (Merge pull request #95 from d0ugal/master)
  • Fixed rendering issue in the docs. (thanks to Dougal Matthews)
  • tweaked the error messages in validation for missing and unknown fields to aid in debugging projects (thanks to Phillip B Oldham)


  • Add spec file for rpm-based distributions (Merge pull request #63 from linuxnow/master)
  • change document size limitation for mongodb 1.8 or later. Thanks to Aleksey Sivokon (Merge pull request #74 from key/master)
  • validation of "" for an int (Merge pull request #79 from barnybug/master)
  • Fix exception when loading documents with a custom type field missing (Merge pull request #80 from barnybug/master)
  • Big documentation restructuration made by Sean Lynch (Merge pull request #82 from sean-lynch/master)
  • Using rename no longer causes migrations throw an exception (Merge pull request #86 from matthewh/master)
  • Some test is modified and added tox (Merge pull request #91 from aircastle/modifiytest)
  • Replace pymongo.objectid with bson.objectid (Merge pull request #88 from behackett/master)
  • Added Support for additional keyword-arguments for index-creation (Merge pull request #85 from mfelsche/master)
  • Remove anyjson dependency and use builtin json instead

Thank you all for all your patches !



  • change MongokitMasterSlaveConnection to MasterSlaveConnection for consistency
  • fix #57 -- support pymongo > 1.9 in
  • fix #45 -- remove automatique index creation
  • fix #43 -- slicing a cursor should return a mongokit document, not dict
  • Dont try to convert None struct to json (patch from @mLewisLogic thanks !)
  • fix schemaless issue (thanks to Mihai Pocorschi for reporting it)


  • add use_schemaless feature ! please see the documentation for more informations

  • Add equality test for mongokit operators (thanks to @allancaffee)

    This allows developers to write unit tests on the structure of their document classes when operators are used

  • roll back find_and_modify for master branch (need pymongo 1.10 for that)

  • many documentation fixes

  • fix #55 -- Bug in VersionedDocument remove() method

  • fix #53 -- Fixed a few spelling errors in README

  • fix #52 -- Advanced bulk migration docs example is broken

  • fix #51 -- pymongo.dbref is deprecated, use bson.dbref instead

  • fix #49 -- Can't specify default values for lists of embedded objects

  • fix #48 -- uuid.UUID support

  • fix #41 -- add basestring to authorized types

  • fix #40 -- Made some enhancements

  • fix #39 -- KeyError when saving partially loaded documents

  • fix #34 -- add find_and_modify method to Document

  • fix #32 -- allow the structure to be empty (was: document.to_json())

  • fix #24 -- Don't handle __database__/__collection__ attribute for virtual documents