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sync/async MongoDB ODM, yes.

Project description

μMongo: sync/async ODM

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μMongo is a Python MongoDB ODM. It inception comes from two needs: the lack of async ODM and the difficulty to do document (un)serialization with existing ODMs.

From this point, μMongo made a few design choices:

  • Stay close to the standards MongoDB driver to keep the same API when possible: use find({"field": "value"}) like usual but retrieve your data nicely OO wrapped !
  • Work with multiple drivers (PyMongo, TxMongo, motor_asyncio and mongomock for the moment)
  • Tight integration with Marshmallow serialization library to easily dump and load your data with the outside world
  • i18n integration to localize validation error messages
  • Free software: MIT license
  • Test with 90%+ coverage ;-)

Quick example

from datetime import datetime
from pymongo import MongoClient
from umongo import Instance, Document, fields, validate

db = MongoClient().test
instance = Instance(db)

@instance.register
class User(Document):
    email = fields.EmailField(required=True, unique=True)
    birthday = fields.DateTimeField(validate=validate.Range(min=datetime(1900, 1, 1)))
    friends = fields.ListField(fields.ReferenceField("User"))

    class Meta:
        collection = db.user

# Make sure that unique indexes are created
User.ensure_indexes()

goku = User(email='goku@sayen.com', birthday=datetime(1984, 11, 20))
goku.commit()
vegeta = User(email='vegeta@over9000.com', friends=[goku])
vegeta.commit()

vegeta.friends
# <object umongo.data_objects.List([<object umongo.dal.pymongo.PyMongoReference(document=User, pk=ObjectId('5717568613adf27be6363f78'))>])>
vegeta.dump()
# {id': '570ddb311d41c89cabceeddc', 'email': 'vegeta@over9000.com', friends': ['570ddb2a1d41c89cabceeddb']}
User.find_one({"email": 'goku@sayen.com'})
# <object Document __main__.User({'id': ObjectId('570ddb2a1d41c89cabceeddb'), 'friends': <object umongo.data_objects.List([])>,
#                                 'email': 'goku@sayen.com', 'birthday': datetime.datetime(1984, 11, 20, 0, 0)})>

Get it now:

$ pip install umongo           # This installs umongo with pymongo
$ pip install my-mongo-driver  # Other MongoDB drivers must be installed manually

Or to get it along with the MongoDB driver you’re planing to use:

$ pip install umongo[motor]
$ pip install umongo[txmongo]
$ pip install umongo[mongomock]

History

2.0.1 (2019-03-25)

Bug fixes:

  • Fix deserialization of EmbeddedDocument containing fields overriding _deserialize_from_mongo (see #186).

2.0.0 (2019-03-18)

Features:

  • Backwards-incompatible: missing attribute is no longer used in umongo fields, only default is used. marshmallow_missing and marshmallow_default attribute can be used to overwrite the value to use in the pure marshmallow field returned by as_marshmallow_field method (see #36 and #107).
  • Backwards-incompatible: as_marshmallow_field does not pass load_from, dump_to and attribute to the pure marshmallow field anymore. It only passes validate, required, allow_none, dump_only, load_only and error_messages, as well as default and missing values inferred from umongo’s default. Parameters prefixed with marshmallow_ in the umongo field are passed to the pure marshmallow field and override their non-prefixed counterpart. (see #170)
  • Backwards-incompatible: DictField and ListField don’t default to empty Dict/List. To keep old behaviour, pass dict/list as default. (see #105)
  • Backwards-incompatible: Serialize empty Dict/List as empty rather than missing (see #105).
  • Round datetimes to millisecond precision in DateTimeField, LocalDateTimeField and StrictDateTimeField to keep consistency between object and database representation (see #172 and #175).
  • Add DateField (see #178).

Bug fixes:

  • Fix passing a default value to a DictField/ListField as a raw Python dict/list (see #78).
  • The default parameter of a Field is deserialized and validated (see #174).

Other changes:

  • Support Python 3.7 (see #181).
  • Backwards-incompatible: Drop Python 3.4 support (see #176) and only use async/await coroutine style in asyncio framework (see #179).

1.2.0 (2019-02-08)

  • Add Schema cache to as_marshmallow_schema (see #165).
  • Add DecimalField. This field only works on MongoDB 3.4+. (see #162)

1.1.0 (2019-01-14)

  • Fix bug when filtering by id in a Document subclass find query (see #145).
  • Fix __getattr__ to allow copying and deepcopying Document and EmbeddedDocument (see #157).
  • Add Document.clone() method (see #158).

1.0.0 (2018-11-29)

  • Raise UnknownFieldInDBError when an unknown field is found in database and not using BaseNonStrictDataProxy (see #121)
  • Fix (non fatal) crash in garbage collector when using WrappedCursor with mongomock
  • Depend on pymongo 3.7+ (see #149)
  • Pass as_marshmallow_schema params to nested schemas. Since this change, every field’s as_marshmallow_schema method should expect unknown **kwargs (see #101).
  • Pass params to container field in ListField.as_marshmallow_schema (see #150)
  • Add meta kwarg to as_marshmallow_schema to pass a dict of attributes for the schema’s Meta class (see #151)

0.15.0 (2017-08-15)

  • Add strict option to (Embedded)DocumentOpts to allow loading of document with unknown fields from mongo (see #115)
  • Fix fields serialization/deserialization when allow_none is True (see #69)
  • Fix ReferenceFild assignment from another ReferenceField (see #110)
  • Fix deletion of field proxied by a property (see #109)
  • Fix StrictDateTime bonus field: _deserialize does not accept datetime.datetime instances (see #106)
  • Add force_reload param to Reference.fetch (see #96)

0.14.0 (2017-03-03)

  • Fix bug in mashmallow tag handling (see #90)
  • Fix allow none in DataProxy.set (see #89)
  • Support motor 1.1 (see #87)

0.13.0 (2017-01-02)

  • Fix deserialization error with nested EmbeddedDocuments (see #84, #67)
  • Add abstract and allow_inheritance options to EmbeddedDocument
  • Remove buggy as_marshmallow_schema’s parameter missing_accessor (see #73, #74)

0.12.0 (2016-11-11)

  • Replace Document.opts.children by offspring and fix grand child inheritance issue (see #66)
  • Fix dependency since release of motor 1.0 with breaking API

0.11.0 (2016-11-02)

  • data_objects Dict and List inherit builtins dict and list
  • Document&EmbeddedDocument store fields passed during initialization as modified (see #50)
  • Required field inside embedded document are handled correctly (see #61)
  • Document support marshmallow’s pre/post processors

0.10.0 (2016-09-29)

  • Add pre/post update/insert/delete hooks (see #22)
  • Provide Umongo to Marshmallow schema/field conversion with schema.as_marshmallow_schema() and field.as_marshmallow_field() (see #34)
  • List and Dict inherit from collections’s UserList and UserDict instead of builtins types (needed due to metaprogramming conflict otherwise)
  • DeleteError and UpdateError returns the driver result object instead of the raw error dict (except for motor which only has raw error dict)

0.9.0 (2016-06-11)

  • Queries can now be expressed with the document’s fields name instead of the name in database
  • EmbeddedDocument also need to be registered by and instance before use

0.8.1 (2016-05-19)

  • Replace Document.created by is_created (see #14)

0.8.0 (2016-05-18)

  • Heavy rewrite of the project, lost of API breakage
  • Documents are now first defined as templates then implemented inside an Instance
  • DALs has been replaced by frameworks implementations of Builder
  • Fix __getitem__ for Pymongo.Cursor wrapper
  • Add conditions argument to Document.commit
  • Add count method to txmongo

0.7.8 (2016-4-28)

  • Fix setup.py style preventing release of version 0.7.7

0.7.7 (2016-4-28)

  • Fix await error with Reference.fetch
  • Pymongo is now only installed with extra flavours of umongo

0.7.6 (2016-4-28)

  • Use extras_require to install driver along with umongo

0.7.5 (2016-4-23)

  • Fixing await (Python >= 3.5) support for motor-asyncio

0.7.4 (2016-4-21)

  • Fix missing package in setup.py

0.7.3 (2016-4-21)

  • Fix setup.py style preventing from release

0.7.2 (2016-4-21)

  • Fix crash when generating indexes on EmbeddedDocument

0.7.1 (2016-4-21)

  • Fix setup.py not to install tests package
  • Pass status to Beta

0.7.0 (2016-4-21)

  • Add i18n support
  • Add MongoMock support
  • Documentation has been a lot extended

0.6.1 (2016-4-13)

  • Add <dal>_lazy_loader to configure Document’s lazy_collection

0.6.0 (2016-4-12)

  • Heavy improvements everywhere !

0.1.0 (2016-1-22)

  • First release on PyPI.

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