mirror of
https://github.com/ets-labs/python-dependency-injector.git
synced 2024-11-22 17:47:02 +03:00
44 lines
1.3 KiB
Python
44 lines
1.3 KiB
Python
"""Declarative catalog overriding by dynamic catalog example."""
|
|
|
|
import collections
|
|
|
|
from dependency_injector import catalogs
|
|
from dependency_injector import providers
|
|
|
|
|
|
# Creating some example classes:
|
|
Object1 = collections.namedtuple('Object1', ['arg1', 'arg2'])
|
|
Object2 = collections.namedtuple('Object2', ['object1'])
|
|
ExtendedObject2 = collections.namedtuple('ExtendedObject2', [])
|
|
|
|
|
|
class Catalog(catalogs.DeclarativeCatalog):
|
|
"""Catalog of some providers."""
|
|
|
|
object1_factory = providers.Factory(Object1,
|
|
arg1=1,
|
|
arg2=2)
|
|
""":type: providers.Provider -> Object1"""
|
|
|
|
object2_factory = providers.Factory(Object2,
|
|
object1=object1_factory)
|
|
""":type: providers.Provider -> Object2"""
|
|
|
|
|
|
# Overriding `Catalog` with some `DynamicCatalog` instance:
|
|
overriding_catalog = catalogs.DynamicCatalog(
|
|
object2_factory=providers.Factory(ExtendedObject2))
|
|
Catalog.override(overriding_catalog)
|
|
|
|
# Creating some objects using overridden catalog:
|
|
object2_1 = Catalog.object2_factory()
|
|
object2_2 = Catalog.object2_factory()
|
|
|
|
# Making some asserts:
|
|
assert Catalog.is_overridden
|
|
|
|
assert object2_1 is not object2_2
|
|
|
|
assert isinstance(object2_1, ExtendedObject2)
|
|
assert isinstance(object2_2, ExtendedObject2)
|