mixer 4.6.2

Mixer -- Is a fixtures replacement. Supported Django ORM, SqlAlchemy ORM, Mongoengine ODM and custom python objects.

Mixer is 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;

• 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-ru.html

Contents

• Requirements

• Installation

• Usage

  • Django

  • Flask, Flask-SQLAlchemy

    • Support for Flask-SQLAlchemy models that have __init__ arguments

  • SQLAlchemy

  • Mongoengine

  • Common usage

  • DB commits

  • Custom fields

  • Middlewares

• Bug tracker

• Contributing

• Contributors

• License

Requirements

• python (2.6, 2.7, 3.2, 3.3)

• Django (1.4, 1.5, 1.6) for django ORM suport;

• SQLAlchemy for SQLAlchemy ORM suport;

• Mongoengine for Mongoengine ODM support;

• Flask-SQLALchemy for SQLAlchemy ORM suport and integration as Flask application;

Installation

Mixer should be installed using pip:

pip install mixer

Usage

By default Mixer try to generate fake data. If you want randomize values

initialize the Mixer by manual like: Mixer(fake=False)

By default Mixer saves generated objects in database. If you want disable

this, initialize the Mixer by manual like: Mixer(commit=False)

Django

Quick example:

from mixer.backend.django import mixer
from customapp.models import User, UserMessage

# Generate random User
user = mixer.blend(User)

# Generate UserMessage
message = mixer.blend(UserMessage, user=user)

# Generate UserMessage and User. Set User.username 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 field with default to random
some = mixer.blend('someapp.somemodel', money=mixer.RANDOM)

# Generate 5 SomeModel instances and get a field values from custom generator
some_models = mixer.cycle(5).blend('somemodel', company=(company for company in companies))

Flask, Flask-SQLAlchemy

Quick example:

from mixer.backend.flask import mixer
from models import User, UserMessage

mixer.init_app(self.app)

# Generate random User
user = mixer.blend(User)

# Generate UserMessage
message = mixer.blend(UserMessage, user=user)

# Generate UserMessage and User. Set User.username 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 field with default to random
some = mixer.blend('project.models.SomeModel', money=mixer.RANDOM)

# Generate 5 SomeModel instances and get a field 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

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

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 to database. For prevent this behaviour init mixer manually:

from mixer.backend.django import Mixer

mixer = Mixer(commit=False)

Or you can use mixer with custom params as context:

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 manualy.

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.

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 starter happens at github: https://github.com/klen/mixer

Contributors

• Kirill Klenov ([e-mail])

• Antoine Bertin (https://github.com/Diaoul)

• Kirill Pavlov (https://github.com/pavlov99)

• Mahdi Yusuf (https://github.com/myusuf3)

• Marek Baczyński (https://github.com/imbaczek)

• Matt Caldwell (https://github.com/mattcaldwell)

• Skylar Saveland (https://github.com/skyl)

License

Licensed under a BSD license.