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https://github.com/ets-labs/python-dependency-injector.git
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50 lines
1.2 KiB
Python
50 lines
1.2 KiB
Python
"""`Factory` providers delegation example."""
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from dependency_injector.providers import Factory
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from dependency_injector.injections import KwArg
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class User(object):
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"""Example class User."""
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def __init__(self, photos_factory):
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"""Initializer.
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:param photos_factory: (dependency_injector.providers.Factory) -> Photo
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"""
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self.photos_factory = photos_factory
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self._main_photo = None
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super(User, self).__init__()
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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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class Photo(object):
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"""Example class Photo."""
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# User and Photo factories:
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photos_factory = Factory(Photo)
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users_factory = Factory(User,
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KwArg('photos_factory', photos_factory.delegate()))
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# Creating several User objects:
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user1 = users_factory()
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user2 = users_factory()
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# Making some asserts:
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assert isinstance(user1, User)
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assert isinstance(user1.main_photo, Photo)
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assert isinstance(user2, User)
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assert isinstance(user2.main_photo, Photo)
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assert user1 is not user2
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assert user1.main_photo is not user2.main_photo
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