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https://github.com/ets-labs/python-dependency-injector.git
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69 lines
2.0 KiB
Python
69 lines
2.0 KiB
Python
"""`Factory` providers delegation example."""
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import collections
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import dependency_injector.providers as providers
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Photo = collections.namedtuple('Photo', [])
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class User:
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"""Example user model."""
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def __init__(self, photos_factory):
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"""Initialize instance."""
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self.photos_factory = photos_factory
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self._main_photo = None
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@property
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def main_photo(self):
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"""Return user's main photo."""
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if not self._main_photo:
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self._main_photo = self.photos_factory()
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return self._main_photo
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# Defining User and Photo factories using DelegatedFactory provider:
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photos_factory = providers.DelegatedFactory(Photo)
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users_factory = providers.DelegatedFactory(User,
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photos_factory=photos_factory)
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# or using Delegate(Factory(...))
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photos_factory = providers.Factory(Photo)
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users_factory = providers.Factory(User,
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photos_factory=providers.Delegate(
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photos_factory))
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# or using Factory(...).delegate()
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photos_factory = providers.Factory(Photo)
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users_factory = providers.Factory(User,
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photos_factory=photos_factory.delegate())
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# Creating several User objects:
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user1 = users_factory() # Same as: user1 = User(photos_factory=photos_factory)
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user2 = users_factory() # Same as: user2 = User(photos_factory=photos_factory)
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# Making some asserts:
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assert isinstance(user1.main_photo, Photo)
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assert isinstance(user2.main_photo, Photo)
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# or using Factory(...).provider
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photos_factory = providers.Factory(Photo)
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users_factory = providers.Factory(User,
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photos_factory=photos_factory.provider)
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# Creating several User objects:
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user1 = users_factory() # Same as: user1 = User(photos_factory=photos_factory)
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user2 = users_factory() # Same as: user2 = User(photos_factory=photos_factory)
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# Making some asserts:
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assert isinstance(user1.main_photo, Photo)
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assert isinstance(user2.main_photo, Photo)
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