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Mixer -- Is a fixtures replacement. Supported Django, Flask, SqlAlchemy and custom python objects.
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Latest commit a298581 Apr 13, 2016 @klen Bump version: 5.5.6 → 5.5.7

README.rst

logo Mixer

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:

Build Status Coverals Version Downloads License

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 (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;

Installation

Mixer should be installed using pip:

pip install mixer

Usage

By default Mixer tries to generate a 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)

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 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 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)

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')

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

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)

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 user

You can add several middlewares. Each middleware should get one argument (generated value) and return them.

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

License

Licensed under a BSD license.

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