[Solved] Identify the error in this FastAPI SQLAlchemy session usage:def get_user(db: SessionLocal): user = db.query(User).first() return user @app.get('/user') def read_user(db: SessionLocal = Depends()):... | FastAPI

FastAPI - Database Integration

Identify the error in this FastAPI SQLAlchemy session usage:

def get_user(db: SessionLocal):
    user = db.query(User).first()
    return user

@app.get('/user')
def read_user(db: SessionLocal = Depends()):
    return get_user(db)

AFunction get_user should not return user.

BDepends() missing the session dependency function.

Cdb.query() should be db.session.query().

DUser model is not imported.

Step-by-Step Solution

Solution:

Step 1: Check Depends() usage
Depends() requires a callable that provides the session, usually a function that yields a session instance.
Step 2: Identify missing dependency function
Here, Depends() is empty, so FastAPI cannot inject the session properly, causing an error.
Final Answer:
Depends() missing the session dependency function. -> Option B
Quick Check:
Depends() needs a provider function [OK]

Quick Trick: Always pass session provider to Depends() [OK]

Common Mistakes:

MISTAKES

Leaving Depends() empty
Confusing query syntax
Ignoring import errors

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More FastAPI Quizzes

Identify the error in this FastAPI SQLAlchemy session usage:

Step 1: Check Depends() usage

Step 2: Identify missing dependency function

Final Answer:

Quick Check:

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