mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2025-10-31 07:57:43 +03:00
96 lines
2.5 KiB
Python
96 lines
2.5 KiB
Python
"""Overriding user's model example."""
|
|
|
|
import dependency_injector.providers as providers
|
|
|
|
|
|
class User:
|
|
"""Example class User."""
|
|
|
|
def __init__(self, id, password):
|
|
"""Initialize instance."""
|
|
self.id = id
|
|
self.password = password
|
|
super().__init__()
|
|
|
|
|
|
class UsersService:
|
|
"""Example class UsersService."""
|
|
|
|
def __init__(self, user_cls):
|
|
"""Initialize instance."""
|
|
self.user_cls = user_cls
|
|
super().__init__()
|
|
|
|
def get_by_id(self, id):
|
|
"""Find user by his id and return user model."""
|
|
return self.user_cls(id=id, password='secret' + str(id))
|
|
|
|
|
|
# Users factory and UsersService provider:
|
|
users_service = providers.Factory(UsersService, user_cls=User)
|
|
|
|
# Getting several users and making some asserts:
|
|
user1 = users_service().get_by_id(1)
|
|
user2 = users_service().get_by_id(2)
|
|
|
|
assert isinstance(user1, User)
|
|
assert user1.id == 1
|
|
assert user1.password == 'secret1'
|
|
|
|
assert isinstance(user2, User)
|
|
assert user2.id == 2
|
|
assert user2.password == 'secret2'
|
|
|
|
assert user1 is not user2
|
|
|
|
# Extending user model and user service for adding custom attributes without
|
|
# making any changes to client's code.
|
|
|
|
|
|
class ExtendedUser(User):
|
|
"""Example class ExtendedUser."""
|
|
|
|
def __init__(self, id, password, first_name=None, last_name=None,
|
|
gender=None):
|
|
"""Initialize instance."""
|
|
self.first_name = first_name
|
|
self.last_name = last_name
|
|
self.gender = gender
|
|
super().__init__(id, password)
|
|
|
|
|
|
class ExtendedUsersService(UsersService):
|
|
"""Example class ExtendedUsersService."""
|
|
|
|
def get_by_id(self, id):
|
|
"""Find user by his id and return user model."""
|
|
user = super(ExtendedUsersService, self).get_by_id(id)
|
|
user.first_name = 'John' + str(id)
|
|
user.last_name = 'Smith' + str(id)
|
|
user.gender = 'male'
|
|
return user
|
|
|
|
|
|
# Overriding users_service provider:
|
|
extended_users_service = providers.Factory(ExtendedUsersService,
|
|
user_cls=ExtendedUser)
|
|
users_service.override(extended_users_service)
|
|
|
|
# Getting few other users users and making some asserts:
|
|
user3 = users_service().get_by_id(3)
|
|
user4 = users_service().get_by_id(4)
|
|
|
|
assert isinstance(user3, ExtendedUser)
|
|
assert user3.id == 3
|
|
assert user3.password == 'secret3'
|
|
assert user3.first_name == 'John3'
|
|
assert user3.last_name == 'Smith3'
|
|
|
|
assert isinstance(user4, ExtendedUser)
|
|
assert user4.id == 4
|
|
assert user4.password == 'secret4'
|
|
assert user4.first_name == 'John4'
|
|
assert user4.last_name == 'Smith4'
|
|
|
|
assert user3 is not user4
|