You need to create a shared dependency in FastAPI that provides a database session and ensures the session is closed after the request completes. Which implementation correctly achieves this?

hard🚀 Application Q8 of 15

FastAPI - Dependency Injection

AUse a dependency function with <code>yield</code> to provide the session and close it after yielding

BReturn the session object directly without cleanup logic

CCreate the session inside the route handler and close it manually

DUse a global session object shared across all requests without closing

Step-by-Step Solution

Solution:

Step 1: Use yield in dependency
FastAPI supports dependencies with yield to provide setup and teardown logic.
Step 2: Provide session and cleanup
The dependency yields the session, then closes it after the request finishes.
Step 3: Avoid global or manual closing
Global sessions or manual closing inside routes can cause concurrency issues or leaks.
Final Answer:
Use a dependency function with yield to provide the session and close it after yielding -> Option A
Quick Check:
Yield-based dependencies handle cleanup automatically [OK]

Quick Trick: Use yield in dependencies for setup and teardown [OK]

Common Mistakes:

MISTAKES

Not closing sessions causing resource leaks
Using global sessions shared unsafely
Closing sessions manually inside routes

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More FastAPI Quizzes

You need to create a shared dependency in FastAPI that provides a database session and ensures the session is closed after the request completes. Which implementation correctly achieves this?

Step 1: Use yield in dependency

Step 2: Provide session and cleanup

Step 3: Avoid global or manual closing

Final Answer:

Quick Check:

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