How do you use FastAPI dependency injection for database sessions?
WHAT IT TESTS: FastAPI Depends() for session lifecycle and testability. ANSWER OUTLINE: Build a generator dependency that yields a session and closes it after; inject via Depends(get_db).
WHAT IT TESTS: Whether you understand FastAPI dependency injection for session lifecycle and testability. ANSWER OUTLINE: Create a generator dependency that yields a session and closes it in a finally block after the request; inject it with Depends(get_db). This centralizes connection handling, prevents leaks, and lets you override the dependency in tests. RED FLAG: Treating DI as mere syntactic sugar, omitting yield cleanup, or suggesting a global shared session that breaks under concurrency.
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- #sqlalchemy
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