python-dependency-injector/examples/providers/factory_attribute_injection...

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2015-06-08 08:33:27 +00:00
"""`Factory` providers with attribute injections example."""
from objects.providers import Factory
from objects.injections import Attribute
class User(object):
"""Example class User."""
def __init__(self):
"""Initializer."""
self.main_photo = None
self.credit_card = None
class Photo(object):
"""Example class Photo."""
class CreditCard(object):
"""Example class CreditCard."""
# User, Photo and CreditCard factories:
credit_cards_factory = Factory(CreditCard)
photos_factory = Factory(Photo)
users_factory = Factory(User,
Attribute('main_photo', photos_factory),
Attribute('credit_card', credit_cards_factory))
# Creating several User objects:
user1 = users_factory() # Same as: user1 = User()
# user1.main_photo = Photo()
# user1.credit_card = CreditCard()
user2 = users_factory() # Same as: user2 = User()
# user2.main_photo = Photo()
# user2.credit_card = CreditCard()
# Making some asserts:
assert user1 is not user2
assert isinstance(user1.main_photo, Photo)
assert isinstance(user1.credit_card, CreditCard)
assert isinstance(user2.main_photo, Photo)
assert isinstance(user2.credit_card, CreditCard)
assert user1.main_photo is not user2.main_photo
assert user1.credit_card is not user2.credit_card