FastAPI - Dependency Injection
You want to create a dependency that multiplies a query parameter by a fixed factor passed when creating the dependency. Which approach is correct?
You want to create a dependency that multiplies a query parameter by a fixed factor passed when creating the dependency. Which approach is correct?
hard🚀 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand parameterized dependency pattern
To pass a fixed factor, create a function that returns a dependency function capturing that factor.Step 2: Use query parameter inside returned dependency
The returned dependency function can accept the query parameter and multiply it by the fixed factor.Final Answer:
Create a function that takes factor and returns a dependency function using the query parameter -> Option CQuick Check:
Parameterized dependency = function returning dependency function [OK]
Quick Trick: Use closures to capture fixed parameters in dependencies [OK]
Common Mistakes:
MISTAKES- Using global variables instead of closures
- Passing factor as query parameter instead of fixed
- Using classes without __call__ for dependencies
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