mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-25 19:14:00 +03:00
69 lines
2.0 KiB
Python
69 lines
2.0 KiB
Python
"""`Factory` providers delegation example."""
|
|
|
|
import collections
|
|
|
|
import dependency_injector.providers as providers
|
|
|
|
|
|
Photo = collections.namedtuple('Photo', [])
|
|
|
|
|
|
class User(object):
|
|
"""Example user model."""
|
|
|
|
def __init__(self, photos_factory):
|
|
"""Initializer."""
|
|
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() # Same as: user1 = User(photos_factory=photos_factory)
|
|
user2 = users_factory() # Same as: 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() # Same as: user1 = User(photos_factory=photos_factory)
|
|
user2 = users_factory() # Same as: user2 = User(photos_factory=photos_factory)
|
|
|
|
# Making some asserts:
|
|
assert isinstance(user1.main_photo, Photo)
|
|
assert isinstance(user2.main_photo, Photo)
|