[Solved] How do you correctly declare a FastAPI dependency that itself depends on another dependency? - Ans: Use Depends() inside the parameter list of the main dependency function. | FastAPI

FastAPI - Dependency Injection

How do you correctly declare a FastAPI dependency that itself depends on another dependency?

ACall the sub-dependency function directly inside the main dependency function.

BUse Depends() inside the parameter list of the main dependency function.

CImport the sub-dependency and assign it to a global variable.

DUse the @sub_dependency decorator on the main dependency function.

Step-by-Step Solution

Solution:

Step 1: Understand Depends()
FastAPI uses Depends() to declare dependencies.
Step 2: Declaring Sub-dependencies
Inside a dependency function, you declare sub-dependencies by adding parameters with Depends(sub_dependency_function).
Final Answer:
Use Depends() inside the parameter list of the main dependency function. -> Option B
Quick Check:
Sub-dependencies require Depends() in parameters [OK]

Quick Trick: Declare sub-dependencies with Depends() in parameters [OK]

Common Mistakes:

MISTAKES

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