old_contents: """`Factory` providers delegation example."""
  
  import collections
  
  import dependency_injector.providers as providers
  
  
  Photo = collections.namedtuple('Photo', [])
  
  
  class User:
      """Example user model."""
  
      def __init__(self, photos_factory):
          """Initialize instance."""
          self.photos_factory = photos_factory
          self._main_photo = None
  
      @property
      def main_photo(self):
          """Return user's main photo."""
          if not self._main_photo:
              self._main_photo = self.photos_factory()
          return self._main_photo
  
  
  # Defining User and Photo factories using DelegatedFactory provider:
  photos_factory = providers.DelegatedFactory(Photo)
  users_factory = providers.DelegatedFactory(
      User,
      photos_factory=photos_factory,
  )
  
  # or using Delegate(Factory(...))
  
  photos_factory = providers.Factory(Photo)
  users_factory = providers.Factory(
      User,
      photos_factory=providers.Delegate(photos_factory),
  )
  
  
  # or using Factory(...).delegate()
  
  photos_factory = providers.Factory(Photo)
  users_factory = providers.Factory(
      User,
      photos_factory=photos_factory.delegate(),
  )
  
  
  # Creating several User objects:
  user1 = users_factory()
  user2 = users_factory()
  
  # Same as:
  # user1 = User(photos_factory=photos_factory)
  # user2 = User(photos_factory=photos_factory)
  
  # Making some asserts:
  assert isinstance(user1.main_photo, Photo)
  assert isinstance(user2.main_photo, Photo)
  
  # or using Factory(...).provider
  
  photos_factory = providers.Factory(Photo)
  users_factory = providers.Factory(
      User,
      photos_factory=photos_factory.provider,
  )
  
  # Creating several User objects:
  user1 = users_factory()
  user2 = users_factory()
  
  # Same as:
  # user1 = User(photos_factory=photos_factory)
  # user2 = User(photos_factory=photos_factory)
  
  # Making some asserts:
  assert isinstance(user1.main_photo, Photo)
  assert isinstance(user2.main_photo, Photo)
  
new_contents: """`Factory` providers delegation example."""
  
  import collections
  
  import dependency_injector.providers as providers
  
  
  Photo = collections.namedtuple('Photo', [])
  
  
  class User:
      """Example user model."""
  
      def __init__(self, photos_factory):
          """Initialize instance."""
          self.photos_factory = photos_factory
          self._main_photo = None
  
      @property
      def main_photo(self):
          """Return user's main photo."""
          if not self._main_photo:
              self._main_photo = self.photos_factory()
          return self._main_photo
  
  
  # Defining User and Photo factories using DelegatedFactory provider:
  photos_factory = providers.DelegatedFactory(Photo)
  users_factory = providers.Factory(
      User,
      photos_factory=photos_factory,
  )
  
  # or using Delegate(Factory(...))
  
  photos_factory = providers.Factory(Photo)
  users_factory = providers.Factory(
      User,
      photos_factory=providers.Delegate(photos_factory),
  )
  
  
  # or using Factory(...).delegate()
  
  photos_factory = providers.Factory(Photo)
  users_factory = providers.Factory(
      User,
      photos_factory=photos_factory.delegate(),
  )
  
  
  # Creating several User objects:
  user1 = users_factory()
  user2 = users_factory()
  
  # Same as:
  # user1 = User(photos_factory=photos_factory)
  # user2 = User(photos_factory=photos_factory)
  
  # Making some asserts:
  assert isinstance(user1.main_photo, Photo)
  assert isinstance(user2.main_photo, Photo)
  
  # or using Factory(...).provider
  
  photos_factory = providers.Factory(Photo)
  users_factory = providers.Factory(
      User,
      photos_factory=photos_factory.provider,
  )
  
  # Creating several User objects:
  user1 = users_factory()
  user2 = users_factory()
  
  # Same as:
  # user1 = User(photos_factory=photos_factory)
  # user2 = User(photos_factory=photos_factory)
  
  # Making some asserts:
  assert isinstance(user1.main_photo, Photo)
  assert isinstance(user2.main_photo, Photo)
  
subject: Make a fix in the providers delegation example