Fastapi : how to get app instance in router?

Question

I want to get app instance in my router file , what should I do ?

My main.py is

...
app = FastAPI()
app.machine_learning_model = joblib.load(some_path)
app.include_router(some_router)
...

Now I want to use app.machine_learning_model in some_router's file , what should I do ?

score 2 · Accepted Answer · answered Feb 28 '22 at 17:42

2

You could access the app instance using request.app, as shown below:

from fastapi import Request

@router.get("/some_route")
async def some_router_function(request: Request):
    model = request.app.machine_learning_model

answered Feb 28 '22 at 17:42

Chris

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May I add other request params in ```some_router_function``` ? – DachuanZhao Mar 01 '22 at 12:10
Yes. You can define params as usual. – Chris Mar 01 '22 at 12:20
Thank you for your answer! I'm quite shocked that FastAPI does not provide any streamlined possibility to store Singletons for the service lifecycle. – tahesse Apr 05 '22 at 11:13

Fastapi : how to get app instance in router?

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