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https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-23 18:13:56 +03:00
47 lines
1.1 KiB
Python
47 lines
1.1 KiB
Python
"""`di.Factory` providers delegation example."""
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import dependency_injector as di
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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: (di.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 = di.Factory(Photo)
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users_factory = di.Factory(User,
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photos_factory=di.Delegate(photos_factory))
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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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