✨ Use request.state for SQLAlchemy session in tutorial (#45)

docs/release-notes.md

@@ -1,5 +1,9 @@
 ## Next
 
+* Update SQL with SQLAlchemy tutorial at <a href="https://fastapi.tiangolo.com/tutorial/sql-databases/" target="_blank">https://fastapi.tiangolo.com/tutorial/sql-databases/</a> using the new official `request.state`.
+
+* Upgrade Starlette to version `0.11.1` and add required compatibility changes. PR <a href="https://github.com/tiangolo/fastapi/pull/44" target="_blank">#44</a>.
+
 ## 0.5.1
 
 * Add section about <a href="https://fastapi.tiangolo.com/help-fastapi/" target="_blank">helping and getting help with **FastAPI**</a>.

docs/src/sql_databases/tutorial001.py

@@ -55,13 +55,13 @@ app = FastAPI()
 
 @app.get("/users/{user_id}")
 def read_user(request: Request, user_id: int):
-    user = get_user(request._scope["db"], user_id=user_id)
+    user = get_user(request.state.db, user_id=user_id)
     return user
 
 
 @app.middleware("http")
-async def close_db(request, call_next):
-    request._scope["db"] = Session()
+async def close_db(request: Request, call_next):
+    request.state.db = Session()
     response = await call_next(request)
-    request._scope["db"].close()
+    request.state.db.close()
     return response

docs/tutorial/sql-databases.md

@@ -102,15 +102,12 @@ The middleware we will create (just a function) will create a new SQLAlchemy `Se
 {!./src/sql_databases/tutorial001.py!}
 ```
 
-### About `request._scope`
+### About `request.state`
 
-`request._scope` is a "private property" of each request. We normally shouldn't need to use a "private property" from a Python object.
+<a href="https://www.starlette.io/requests/#other-state" target="_blank">`request.state` is a property of each Starlette `Request` object</a>, it is there to store arbitrary objects attached to the request itself, like the database session in this case.
 
-But we need to attach the session to the request to be able to ensure a single session/database-connection is used through all the request, and then closed afterwards.
+For us in this case, it helps us ensuring a single session/database-connection is used through all the request, and then closed afterwards (in the middleware).
 
-In the near future, Starlette <a href="https://github.com/encode/starlette/issues/379" target="_blank">will have a way to attach custom objects to each request</a>.
-
-When that happens, this tutorial will be updated to use the new official way of doing it.
 
 ## Create a `CustomBase` model