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Examples
========
Here are some real-world examples of using FactoryBoy.
Objects
-------
First, let's define a couple of objects:
.. code-block:: python
class Account(object):
def __init__(self, username, email):
self.username = username
self.email = email
def __str__(self):
return '%s (%s)' % (self.username, self.email)
class Profile(object):
GENDER_MALE = 'm'
GENDER_FEMALE = 'f'
GENDER_UNKNOWN = 'u' # If the user refused to give it
def __init__(self, account, gender, firstname, lastname, planet='Earth'):
self.account = account
self.gender = gender
self.firstname = firstname
self.lastname = lastname
self.planet = planet
def __unicode__(self):
return u'%s %s (%s)' % (
unicode(self.firstname),
unicode(self.lastname),
unicode(self.account.accountname),
)
Factories
---------
And now, we'll define the related factories:
.. code-block:: python
import datetime
import factory
import random
from . import objects
class AccountFactory(factory.Factory):
class Meta:
model = objects.Account
username = factory.Sequence(lambda n: 'john%s' % n)
email = factory.LazyAttribute(lambda o: '%s@example.org' % o.username)
date_joined = factory.LazyFunction(datetime.datetime.now)
class ProfileFactory(factory.Factory):
class Meta:
model = objects.Profile
account = factory.SubFactory(AccountFactory)
gender = factory.Iterator([objects.Profile.GENDER_MALE, objects.Profile.GENDER_FEMALE])
firstname = u'John'
lastname = u'Doe'
We have now defined basic factories for our :class:`~Account` and :class:`~Profile` classes.
If we commonly use a specific variant of our objects, we can refine a factory accordingly:
.. code-block:: python
class FemaleProfileFactory(ProfileFactory):
gender = objects.Profile.GENDER_FEMALE
firstname = u'Jane'
user__username = factory.Sequence(lambda n: 'jane%s' % n)
Using the factories
-------------------
We can now use our factories, for tests:
.. code-block:: python
import unittest
from . import business_logic
from . import factories
from . import objects
class MyTestCase(unittest.TestCase):
def test_send_mail(self):
account = factories.AccountFactory()
email = business_logic.prepare_email(account, subject='Foo', text='Bar')
self.assertEqual(email.to, account.email)
def test_get_profile_stats(self):
profiles = []
profiles.extend(factories.ProfileFactory.create_batch(4))
profiles.extend(factories.FemaleProfileFactory.create_batch(2))
profiles.extend(factories.ProfileFactory.create_batch(2, planet="Tatooine"))
stats = business_logic.profile_stats(profiles)
self.assertEqual({'Earth': 6, 'Mars': 2}, stats.planets)
self.assertLess(stats.genders[objects.Profile.GENDER_FEMALE], 2)
Or for fixtures:
.. code-block:: python
from . import factories
def make_objects():
factories.ProfileFactory.create_batch(size=50)
# Let's create a few, known objects.
factories.ProfileFactory(
gender=objects.Profile.GENDER_MALE,
firstname='Luke',
lastname='Skywalker',
planet='Tatooine',
)
factories.ProfileFactory(
gender=objects.Profile.GENDER_FEMALE,
firstname='Leia',
lastname='Organa',
planet='Alderaan',
)
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