[Solved] Which of the following code snippets correctly uses a shared dependency in FastAPI? - Ans: async def get_db(): pass @app.get('/items') async def... | FastAPI

FastAPI - Dependency Injection

Which of the following code snippets correctly uses a shared dependency in FastAPI?

Aasync def get_db(): pass @app.get('/items') async def read_items(db=get_db()): pass

Basync def get_db(): pass @app.get('/items') async def read_items(db=Depends(get_db)): pass

Casync def get_db(): pass @app.get('/items') async def read_items(db=Depends(get_db())): pass

Dasync def get_db(): pass @app.get('/items') async def read_items(db=Depends): pass

Step-by-Step Solution

Solution:

Step 1: Check how dependency is passed
Dependency functions should be passed as callable to Depends() without calling them.
Step 2: Validate each option
async def get_db(): pass @app.get('/items') async def read_items(db=Depends(get_db)): pass correctly passes get_db as callable. Options B and C call the function directly, and D passes Depends without callable.
Final Answer:
async def get_db(): pass @app.get('/items') async def read_items(db=Depends(get_db)): pass -> Option B
Quick Check:
Depends needs callable, not called function [OK]

Quick Trick: Use Depends with function name only, no parentheses [OK]

Common Mistakes:

MISTAKES

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Which of the following code snippets correctly uses a shared dependency in FastAPI?