remove redundant objects, add nested injection

Author: Elina

examples/providers/context_local_resource.py

@@ -1,12 +1,11 @@
+import asyncio
 from uuid import uuid4
 
 from fastapi import Depends, FastAPI
 
 from dependency_injector import containers, providers
 from dependency_injector.wiring import Closing, Provide, inject
 
-global_list = []
-
 
 class AsyncSessionLocal:
     def __init__(self):
@@ -20,23 +19,35 @@ async def __aexit__(self, exc_type, exc_val, exc_tb):
         print("Closing session !")
 
     async def execute(self, user_input):
+        await asyncio.sleep(0.1)
         return f"Executing {user_input} in session {self.id}"
 
 
+class APIRepository:
+    @inject
+    async def execute(self, user_input, db_session: AsyncSessionLocal = Provide["db_session"]):
+        return await db_session.execute(user_input)
+
+
 app = FastAPI()
 
 
 class Container(containers.DeclarativeContainer):
     db_session = providers.ContextLocalResource(AsyncSessionLocal)
+    api_repository = providers.Factory(APIRepository)
 
 
 @app.get("/")
 @inject
-async def index(db: AsyncSessionLocal = Depends(Closing[Provide["db_session"]])):
-    if db.id in global_list:
-        raise Exception("The db session is already used")  # never reaches here
-    global_list.append(db.id)
-    res = await db.execute("SELECT 1")
+async def index(
+        db: AsyncSessionLocal = Depends(Closing[Provide["db_session"]]),
+        api_repository: APIRepository = Depends(Provide["api_repository"]),
+):
+    user_input = "SELECT 1"
+    res = await db.execute(user_input)
+    res_from_repo = await api_repository.execute(user_input=user_input)
+    assert res == res_from_repo
+
     return str(res)