Unable to override dependency in FastAPI/FastAPi-Utils

Question

This may be a newbie question. I am not able to override the greetings message in this simple 2 files FastAPI project. Could you please tell me what I might have done wrong? Thanks a lot for your help.

greetings_service.py

from fastapi import Depends from fastapi_utils.cbv import cbv from fastapi_utils.inferring_router import InferringRouter router = InferringRouter() def get_msg(): return "Original Message" @cbv(router) class GreetingsService: @router.get("/") async def greet(self, msg: str = Depends(get_msg)): return f"Hello from FastAPI {msg}"

main.py

from fastapi import FastAPI from starlette.testclient import TestClient import greetings_service app = FastAPI() app.include_router(greetings_service.router) def get_new_msg(): return "New Message" //Tried this, doesn't work #app.dependency_overrides["get_msg"] = get_new_msg() //These 2 lines doesn't work too app.dependency_overrides["get_msg"] = get_new_msg() greetings_service.router.dependency_overrides_provider = app client = TestClient(app) res = client.get("/") print(res.content) #"Hello from FastAPI Original Message" :(

LearningNoob · Accepted Answer · 2020-10-21 15:53:12Z

The issue is with this:

app.dependency_overrides["get_msg"] = get_new_msg()

You are passing the dependency as string instead of the actual dependency.

Something like this would work:

from fastapi import FastAPI from starlette.testclient import TestClient import greetings_service app = FastAPI() app.include_router(greetings_service.router) def get_new_msg(): return "New Message" app.dependency_overrides[greetings_service.get_msg] = get_new_msg client = TestClient(app) res = client.get("/") print(res.content)

Actually, for me it worked when I changed the dependency to string

Collectives™ on Stack Overflow

Unable to override dependency in FastAPI/FastAPi-Utils

1 Answer 1

1 Comment

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Related