[Solved] Given the code below, what will be the output when accessing the /users/ endpoint?from fastapi import FastAPI, Depends app = FastAPI() def get_user(): return "Alice" @app.... | FastAPI

FastAPI - Dependency Injection

Given the code below, what will be the output when accessing the /users/ endpoint?

from fastapi import FastAPI, Depends
app = FastAPI()
def get_user():
    return "Alice"
@app.get('/users/')
def read_user(user: str = Depends(get_user)):
    return {"user": user}

ARuntime error due to missing parameter

B{"user": "Alice"}

C{"user": null}

D{"user": "get_user"}

Step-by-Step Solution

Solution:

Step 1: Understand dependency injection
The Depends(get_user) calls get_user and injects its return value into user.
Step 2: Check the returned value from get_user
get_user returns the string "Alice", so the route returns {"user": "Alice"}.
Final Answer:
{"user": "Alice"} -> Option B
Quick Check:
Depends injects function return = "Alice" [OK]

Quick Trick: Depends injects the return value of the dependency function [OK]

Common Mistakes:

MISTAKES

Expecting the function name instead of its return value
Assuming null is injected if no parameter passed
Thinking a runtime error occurs without explicit call

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More FastAPI Quizzes

Given the code below, what will be the output when accessing the /users/ endpoint?

Step 1: Understand dependency injection

Step 2: Check the returned value from get_user

Final Answer:

Quick Check:

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