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https://github.com/ets-labs/python-dependency-injector.git
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81 lines
2.1 KiB
Python
81 lines
2.1 KiB
Python
"""`Factory` providers with init injections and context arguments example."""
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from objects.providers import Factory
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from objects.injections import KwArg
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class User(object):
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"""Example class User.
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Class User has to be provided with user id.
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Also Class User has dependencies on class Photo and class CreditCard
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objects.
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All of the dependencies have to be provided like __init__ arguments.
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"""
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def __init__(self, id, main_photo, credit_card):
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"""Initializer.
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:param id: int
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:param main_photo: Photo
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:param credit_card: CreditCard
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:return:
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"""
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self.id = id
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self.main_photo = main_photo
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self.credit_card = credit_card
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super(User, self).__init__()
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class Photo(object):
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"""Example class Photo."""
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class CreditCard(object):
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"""Example class CreditCard."""
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# User, Photo and CreditCard factories:
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credit_cards_factory = Factory(CreditCard)
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photos_factory = Factory(Photo)
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users_factory = Factory(User,
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KwArg('main_photo', photos_factory),
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KwArg('credit_card', credit_cards_factory))
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# Creating several User objects:
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user1 = users_factory(1)
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# Same as: user1 = User(1,
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# main_photo=Photo(),
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# credit_card=CreditCard())
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user2 = users_factory(2)
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# Same as: user2 = User(2,
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# main_photo=Photo(),
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# credit_card=CreditCard())
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# Making some asserts:
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assert user1.id == 1
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assert isinstance(user1.main_photo, Photo)
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assert isinstance(user1.credit_card, CreditCard)
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assert user2.id == 2
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assert isinstance(user2.main_photo, Photo)
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assert isinstance(user2.credit_card, CreditCard)
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assert user1.main_photo is not user2.main_photo
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assert user1.credit_card is not user2.credit_card
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# Context keyword arguments have priority on KwArg injections priority:
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main_photo_mock = Photo()
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credit_card_mock = CreditCard()
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user3 = users_factory(3, main_photo=main_photo_mock,
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credit_card=credit_card_mock)
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assert user3.id == 3
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assert user3.main_photo is main_photo_mock
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assert user3.credit_card is credit_card_mock
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