[Solved] In FastAPI, how do you declare a dependency that requires a parameter to be passed when used? - Ans: Define a function that returns another function accepting the parameter | FastAPI

FastAPI - Dependency Injection

In FastAPI, how do you declare a dependency that requires a parameter to be passed when used?

ADefine a function that returns another function accepting the parameter

BUse a global variable to store the parameter value

CPass the parameter directly in the route decorator

DUse a class without __call__ method as dependency

Step-by-Step Solution

Solution:

Step 1: Understand dependency with parameters pattern
In FastAPI, to pass parameters to dependencies, you create a function that returns another function which accepts the parameter.
Step 2: Recognize correct usage
This returned function is then used as the actual dependency, allowing parameter passing.
Final Answer:
Define a function that returns another function accepting the parameter -> Option A
Quick Check:
Dependency with parameters = Function returning function [OK]

Quick Trick: Use nested functions to pass parameters in dependencies [OK]

Common Mistakes:

MISTAKES

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In FastAPI, how do you declare a dependency that requires a parameter to be passed when used?