[Solved] Consider this FastAPI snippet:from fastapi import FastAPI, Depends app = FastAPI() def provide_value(): return 100 @app.get("/value") async def get_value(val: int = Depends(provide_value)):... | FastAPI

FastAPI - Dependency Injection

Consider this FastAPI snippet:

from fastapi import FastAPI, Depends
app = FastAPI()
def provide_value():
    return 100
@app.get("/value")
async def get_value(val: int = Depends(provide_value)):
    return {"value": val}

What response will the endpoint return when accessed?

A{"value": "provide_value"}

B{"value": 100}

C{"value": null}

DAn error due to missing parameter

Step-by-Step Solution

Solution:

Step 1: Understand the dependency
The function provide_value returns the integer 100.
Step 2: Dependency injection in endpoint
The endpoint get_value uses Depends(provide_value) to inject the return value of provide_value into the parameter val.
Step 3: Endpoint response
The endpoint returns a JSON with key "value" and the injected integer 100.
Final Answer:
{"value": 100} -> Option B
Quick Check:
Dependency returns 100, injected correctly [OK]

Quick Trick: Dependency returns value injected as parameter [OK]

Common Mistakes:

MISTAKES

Assuming the function name is returned instead of its output
Expecting a null or error response
Confusing parameter injection with direct call

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More FastAPI Quizzes

Consider this FastAPI snippet:

Step 1: Understand the dependency

Step 2: Dependency injection in endpoint

Step 3: Endpoint response

Final Answer:

Quick Check:

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