[Solved] Which syntax correctly declares a class-based dependency in FastAPI? - Ans: class MyDep: async def __call__(self): return 'value' | FastAPI

FastAPI - Dependency Injection

Which syntax correctly declares a class-based dependency in FastAPI?

Aclass MyDep: def dependency(self): return 'value'

Bdef MyDep(): return 'value'

Cclass MyDep: async def __call__(self): return 'value'

Dclass MyDep: def __init__(self): return 'value'

Step-by-Step Solution

Solution:

Step 1: Check correct class-based dependency syntax
FastAPI expects a class with an async or sync __call__ method returning the dependency value.
Step 2: Analyze options
Only class MyDep: async def __call__(self): return 'value' defines __call__ correctly; others are functions or invalid class methods.
Final Answer:
class MyDep:\n async def __call__(self):\n return 'value' -> Option C
Quick Check:
Class with __call__ method = C [OK]

Quick Trick: Use __call__ method inside class for dependency [OK]

Common Mistakes:

MISTAKES

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Which syntax correctly declares a class-based dependency in FastAPI?