Accessing the `app` in `Depends`

I would like to access the FastAPI app in a Depends function, is there a way to do that? The rationale here is that I would like to avoid global variables and use the state in app.

Example usecase:

def get_session(app: fastapi.FastAPI) -> Session:
    [...]
    access the app.state here
    [...]

@router.post("/init")
def create(session: Session = Depends(get_session)):
[...]
use the SQLAlchemy session
[...]

[chbndrhnns]

This works for me:

from fastapi import FastAPI, Depends
from starlette.requests import Request
from starlette.testclient import TestClient

app = FastAPI()


async def dep(request: Request):
    request.app.state.called = True


@app.get("/me", dependencies=[Depends(dep)])
async def me(request: Request):
    return {"called": request.app.state.called}


def test_dep():
    client = TestClient(app)
    res = client.get("/me")
    assert res.json()["called"]

[tiangolo]

Thanks for the help here @chbndrhnns ! 👏 🙇

Thanks for reporting back and closing the issue @nicolaerosia 👍

Sorry for the long delay! 🙈 I wanted to personally address each issue/PR and they piled up through time, but now I’m checking each one in order.