Mixer is an application to generate instances of Django or SQLAlchemy models. It's useful for testing and fixtures replacement. Fast and convenient test-data generation.
Mixer supports:
- Django;
- SQLAlchemy;
- Flask-SQLAlchemy;
- Peewee;
- Pony;
- Mongoengine;
- Marshmallow;
- Custom schemes;
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
- python (2.6, 2.7, 3.2, 3.3, 3.4)
- fake-factory >= 0.5.0
- Django (1.6, 1.7, 1.8) for Django ORM support;
- SQLAlchemy for SQLAlchemy ORM support;
- Mongoengine for Mongoengine ODM support;
- Flask-SQLALchemy for SQLAlchemy ORM support and integration as Flask application;
Mixer should be installed using pip:
pip install mixer
By default Mixer tries to generate a fake (human-friendly) data.If you want to randomize the generated values initialize the Mixerby manual: Mixer(fake=False)By default Mixer saves the generated objects in a database. If you want to disablethis, initialize the Mixer by manual like: Mixer(commit=False)
Quick example:
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 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:
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 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))
For support this scheme, just create your own mixer class, like this:
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:
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:
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:
from mixer.main 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:
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:
from mixer.backend.django import Mixer mixer = Mixer(commit=False)
Or you can temporary switch context use the mixer as context manager:
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')
Mixer allows you to define generators for fields by manually.
Quick example:
from mixer.main import mixer
class Test:
id = int
name = str
mixer.register(Test,
name=lambda: 'John',
id=lambda: str(mixer.g.get_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:
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:
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.
By default mixer uses 'en' locale. You could switch mixer default locale by creating your own mixer:
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:
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'
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
- Antoine Bertin (https://github.com/Diaoul)
- Benjamin Port (https://github.com/bport)
- Dmitriy Moseev (https://github.com/DmitriyMoseev)
- Eelke Hermens (https://github.com/eelkeh)
- Esteban J. G. Gabancho (https://github.com/egabancho)
- Felix Dreissig (https://github.com/F30)
- Illia Volochii (https://github.com/illia-v)
- Kirill Klenov (https://github.com/klen, [email protected])
- Kirill Pavlov (https://github.com/pavlov99)
- Kwok-kuen Cheung (https://github.com/cheungpat)
- Mahdi Yusuf (https://github.com/myusuf3)
- Marek Baczyński (https://github.com/imbaczek)
- Matt Caldwell (https://github.com/mattcaldwell)
- Skylar Saveland (https://github.com/skyl)
- Suriya Subramanian (https://github.com/suriya)
Licensed under a BSD license.