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:
Pony;
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
Requirements
Python 3.7+
Django (3.0, 3.1) for Django ORM support;
Flask-SQLALchemy for SQLAlchemy ORM support and integration as Flask application;
Faker >= 0.7.3
Mongoengine for Mongoengine ODM support;
SQLAlchemy for SQLAlchemy ORM support;
Peewee ORM support;
Installation
Mixer should be installed using pip:
pip install mixer
Usage
By default Mixer tries to generate 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)
Django workflow
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 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))Flask, Flask-SQLAlchemy
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 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:
from mixer.backend.sqlalchemy import Mixer
class MyOwnMixer(Mixer):
def populate_target(self, values):
target = self.__scheme(**values)
return target
mixer = MyOwnMixer()SQLAlchemy workflow
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.
Mongoengine workflow
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')Marshmallow workflow
Example usage:
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')Common usage
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)DB commits
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')Custom fields
The 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.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:
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)Middlewares
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 userYou can add several middlewares. Each middleware should get one argument (generated value) and return them.
It’s also possible to unregister a middleware:
mixer.unregister_middleware(encrypt_password)Locales
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'Bug tracker
If you have any suggestions, bug reports or annoyances please report them to the issue tracker at https://github.com/klen/mixer/issues
Contributing
Development of mixer happens at Github: https://github.com/klen/mixer
Contributors
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)
Jannis (https://github.com/jnns)
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)
Marigold (https://github.com/Marigold)
Matt Caldwell (https://github.com/mattcaldwell)
Mikhail Porokhovnichenko (https://github.com/marazmiki)
Skylar Saveland (https://github.com/skyl)
Suriya Subramanian (https://github.com/suriya)
Gram (https://github.com/orsinium)
Joshua (https://github.com/jomasti)
Lucas Rangel Cezimbra (https://github.com/lucasrcezimbra)
avi-pomicell (https://github.com/avi-pomicell)
Jochen Brissier (https://github.com/jbrissier)
License
Licensed under a BSD license.
1 maintainer
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