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https://github.com/ets-labs/python-dependency-injector.git
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95 lines
2.6 KiB
Python
95 lines
2.6 KiB
Python
"""Overriding user's model 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, id, password):
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"""Initializer."""
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self.id = id
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self.password = password
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super(User, self).__init__()
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class UserService(object):
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"""Example class UserService."""
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def __init__(self, user_cls):
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"""Initializer."""
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self.user_cls = user_cls
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super(UserService, self).__init__()
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def get_by_id(self, id):
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"""Find user by his id and return user model."""
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return self.user_cls(id=id, password='secret' + str(id))
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# Users factory and UserService provider:
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users_service = di.Factory(UserService,
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user_cls=User)
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# Getting several users and making some asserts:
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user1 = users_service().get_by_id(1)
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user2 = users_service().get_by_id(2)
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assert isinstance(user1, User)
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assert user1.id == 1
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assert user1.password == 'secret1'
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assert isinstance(user2, User)
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assert user2.id == 2
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assert user2.password == 'secret2'
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assert user1 is not user2
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# Extending user model and user service for adding custom attributes without
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# making any changes to client's code.
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class ExtendedUser(User):
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"""Example class ExtendedUser."""
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def __init__(self, id, password, first_name=None, last_name=None,
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gender=None):
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"""Initializer."""
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self.first_name = first_name
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self.last_name = last_name
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self.gender = gender
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super(ExtendedUser, self).__init__(id, password)
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class ExtendedUserService(UserService):
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"""Example class ExtendedUserService."""
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def get_by_id(self, id):
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"""Find user by his id and return user model."""
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user = super(ExtendedUserService, self).get_by_id(id)
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user.first_name = 'John' + str(id)
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user.last_name = 'Smith' + str(id)
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user.gender = 'male'
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return user
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# Overriding users_service provider:
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extended_users_service = di.Factory(ExtendedUserService,
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user_cls=ExtendedUser)
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users_service.override(extended_users_service)
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# Getting few other users users and making some asserts:
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user3 = users_service().get_by_id(3)
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user4 = users_service().get_by_id(4)
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assert isinstance(user3, ExtendedUser)
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assert user3.id == 3
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assert user3.password == 'secret3'
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assert user3.first_name == 'John3'
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assert user3.last_name == 'Smith3'
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assert isinstance(user4, ExtendedUser)
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assert user4.id == 4
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assert user4.password == 'secret4'
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assert user4.first_name == 'John4'
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assert user4.last_name == 'Smith4'
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assert user3 is not user4
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