Mixer -- Is a fixtures replacement. Supported Django ORM, SqlAlchemy ORM, Mongoengine ODM and custom python objects.
.. image:: https://raw.github.com/klen/mixer/develop/docs/_static/logo.png :width: 100px
The Mixer is a helper to generate instances of Django or SQLAlchemy models. It's useful for testing and fixture replacement. Fast and convenient test-data generation.
Mixer supports:
.. _badges:
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.. _documentation:
Docs are available at https://mixer.readthedocs.org/. Pull requests with documentation enhancements and/or fixes are awesome and most welcome.
Описание на русском языке: http://klen.github.io/mixer.html
.. important::
From version 6.2 the Mixer library doesn't support Python 2. The latest version with python<3 support is mixer 6.1.3
.. _contents:
.. contents::
Mixer should be installed using pip: ::
pip install mixer
| By default Mixer tries to generate fake (human-friendly) data. | If you want to randomize the generated values initialize the Mixer | by manual: Mixer(fake=False)
| By default Mixer saves the generated objects in a database. If you want to disable | this, initialize the Mixer by manual like Mixer(commit=False)
Quick example:
.. code-block:: python
from mixer.backend.django import mixer
from customapp.models import User, UserMessage
# Generate a random user
user = mixer.blend(User)
# Generate an UserMessage
message = mixer.blend(UserMessage, user=user)
# Generate an UserMessage and an User. Set username for generated user to 'testname'.
message = mixer.blend(UserMessage, user__username='testname')
# Generate SomeModel from SomeApp and select FK or M2M values from db
some = mixer.blend('someapp.somemodel', somerelation=mixer.SELECT)
# Generate SomeModel from SomeApp and force a value of money field from default to random
some = mixer.blend('someapp.somemodel', money=mixer.RANDOM)
# Generate SomeModel from SomeApp and skip the generation of money field
some = mixer.blend('someapp.somemodel', money=mixer.SKIP)
# Generate 5 SomeModel's instances and take company field's values from custom generator
some_models = mixer.cycle(5).blend('somemodel', company=(name for name in company_names))
Quick example:
.. code-block:: python
from mixer.backend.flask import mixer
from models import User, UserMessage
mixer.init_app(self.app)
# Generate a random user
user = mixer.blend(User)
# Generate an userMessage
message = mixer.blend(UserMessage, user=user)
# Generate an UserMessage and an User. Set username for generated user to 'testname'.
message = mixer.blend(UserMessage, user__username='testname')
# Generate SomeModel and select FK or M2M values from db
some = mixer.blend('project.models.SomeModel', somerelation=mixer.SELECT)
# Generate SomeModel from SomeApp and force a value of money field from default to random
some = mixer.blend('project.models.SomeModel', money=mixer.RANDOM)
# Generate SomeModel from SomeApp and skip the generation of money field
some = mixer.blend('project.models.SomeModel', money=mixer.SKIP)
# Generate 5 SomeModel's instances and take company field's values from custom generator
some_models = mixer.cycle(5).blend('project.models.SomeModel', company=(company for company in companies))
Support for Flask-SQLAlchemy models that have __init__ arguments
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
For support this scheme, just create your own mixer class, like this:
.. code-block:: python
from mixer.backend.sqlalchemy import Mixer
class MyOwnMixer(Mixer):
def populate_target(self, values):
target = self.__scheme(**values)
return target
mixer = MyOwnMixer()
Example of initialization:
.. code-block:: python
from mixer.backend.sqlalchemy import Mixer
ENGINE = create_engine('sqlite:///:memory:')
BASE = declarative_base()
SESSION = sessionmaker(bind=ENGINE)
mixer = Mixer(session=SESSION(), commit=True)
role = mixer.blend('package.models.Role')
Also, see Flask, Flask-SQLAlchemy.
Example usage:
.. code-block:: python
from mixer.backend.mongoengine import mixer
class User(Document):
created_at = DateTimeField(default=datetime.datetime.now)
email = EmailField(required=True)
first_name = StringField(max_length=50)
last_name = StringField(max_length=50)
username = StringField(max_length=50)
class Post(Document):
title = StringField(max_length=120, required=True)
author = ReferenceField(User)
tags = ListField(StringField(max_length=30))
post = mixer.blend(Post, author__username='foo')
Example usage:
.. code-block:: python
from mixer.backend.marshmallow import mixer
import marshmallow as ma
class User(ma.Schema):
created_at = ma.fields.DateTime(required=True)
email = ma.fields.Email(required=True)
first_name = ma.fields.String(required=True)
last_name = ma.fields.String(required=True)
username = ma.fields.String(required=True)
class Post(ma.Schema):
title = ma.fields.String(required=True)
author = ma.fields.Nested(User, required=True)
post = mixer.blend(Post, author__username='foo')
Quick example:
.. code-block:: python
from mixer.main import mixer
class Test:
one = int
two = int
name = str
class Scheme:
name = str
money = int
male = bool
prop = Test
scheme = mixer.blend(Scheme, prop__one=1)
By default 'django', 'flask', 'mongoengine' backends tries to save objects in
database. For preventing this behavior init mixer manually:
.. code-block:: python
from mixer.backend.django import Mixer
mixer = Mixer(commit=False)
Or you can temporary switch context use the mixer as context manager:
.. code-block:: python
from mixer.backend.django import mixer
# Will be save to db
user1 = mixer.blend('auth.user')
# Will not be save to db
with mixer.ctx(commit=False):
user2 = mixer.blend('auth.user')
.. _custom:
The mixer allows you to define generators for fields by manually. Quick example:
.. code-block:: python
from mixer.main import mixer
class Test:
id = int
name = str
mixer.register(Test,
name=lambda: 'John',
id=lambda: str(mixer.faker.small_positive_integer())
)
test = mixer.blend(Test)
test.name == 'John'
isinstance(test.id, str)
# You could pinned just a value to field
mixer.register(Test, name='Just John')
test = mixer.blend(Test)
test.name == 'Just John'
Also, you can make your own factory for field types:
.. code-block:: python
from mixer.backend.django import Mixer, GenFactory
def get_func(*args, **kwargs):
return "Always same"
class MyFactory(GenFactory):
generators = {
models.CharField: get_func
}
mixer = Mixer(factory=MyFactory)
You can add middleware layers to process generation:
.. code-block:: python
from mixer.backend.django import mixer
# Register middleware to model
@mixer.middleware('auth.user')
def encrypt_password(user):
user.set_password('test')
return user
You can add several middlewares. Each middleware should get one argument (generated value) and return them.
It's also possible to unregister a middleware:
.. code-block:: python
mixer.unregister_middleware(encrypt_password)
By default mixer uses 'en' locale. You could switch mixer default locale by creating your own mixer:
.. code-block:: python
from mixer.backend.django import Mixer
mixer = Mixer(locale='it')
mixer.faker.name() ## u'Acchisio Conte'
At any time you could switch mixer current locale:
.. code-block:: python
mixer.faker.locale = 'cz'
mixer.faker.name() ## u'Miloslava Urbanov\xe1 CSc.'
mixer.faker.locale = 'en'
mixer.faker.name() ## u'John Black'
# Use the mixer context manager
mixer.faker.phone() ## u'1-438-238-1116'
with mixer.ctx(locale='fr'):
mixer.faker.phone() ## u'08 64 92 11 79'
mixer.faker.phone() ## u'1-438-238-1116'
.. _bugtracker:
If you have any suggestions, bug reports or annoyances please report them to the issue tracker at https://github.com/klen/mixer/issues
Development of mixer happens at Github: https://github.com/klen/mixer
Licensed under a BSD license_.
.. _links:
.. _Django: http://djangoproject.com/ .. _Flask: https://flask.palletsprojects.com/en/1.1.x/ .. _Flask-SQLAlchemy: http://flask-sqlalchemy.pocoo.org/ .. _SQLAlchemy: http://www.sqlalchemy.org/ .. _Marshmallow: http://marshmallow.readthedocs.io/en/latest/ .. _Mongoengine: http://mongoengine.org/ .. _Peewee: http://peewee.readthedocs.org/en/latest/ .. _Pony: http://ponyorm.com/ .. _klen: http://klen.github.io .. _BSD license: http://www.linfo.org/bsdlicense.html