[Solved] What is wrong with this FastAPI route using a database session? ```python @app.get("/users/{user_id}") def get_user(user_id:... What is wrong with this FastAPI route using a database session? | FastAPI

FastAPI - Database Integration

What is wrong with this FastAPI route using a database session? ```python @app.get("/users/{user_id}") def get_user(user_id: int, db: Session = Depends(get_db)): user = db.query(User).filter(User.id == user_id).first() db.close() return user ``` Options:

ADepends(get_db) is used incorrectly

BCalling db.close() inside the route can close session prematurely

CThe filter condition is invalid

DRoute must be async to use database session

Step-by-Step Solution

Solution:

Step 1: Check session closing in route
Calling db.close() manually in route can close session before response is fully processed.
Step 2: Understand dependency management
Session should be closed by dependency, not manually in route, to avoid premature closure.
Final Answer:
Calling db.close() inside the route can close session prematurely -> Option B
Quick Check:
Close session in dependency, not route [OK]

Quick Trick: Let dependency handle session close, not route code [OK]

Common Mistakes:

MISTAKES

Closing session manually in route
Misusing Depends syntax
Thinking route must be async for DB

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What is wrong with this FastAPI route using a database session?

Step 1: Check session closing in route

Step 2: Understand dependency management

Final Answer:

Quick Check:

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