How can you combine a guard with a custom decorator to restrict access based on user permissions in NestJS?

hard📝 Application Q9 of 15

NestJS - Guards

AApply the guard only on the decorator function

BCreate a decorator to set metadata, then read it in the guard via Reflector

CUse the decorator to throw errors directly without a guard

DUse the decorator to modify the request object directly

Step-by-Step Solution

Solution:

Step 1: Understand metadata usage
Custom decorators set metadata on routes or controllers.
Step 2: Guard reads metadata
Guards use Reflector to read metadata and decide access.
Step 3: Eliminate incorrect options
Throwing errors in decorators or modifying requests directly is not standard; guards control access.
Final Answer:
Create a decorator to set metadata, then read it in the guard via Reflector -> Option B
Quick Check:
Decorator sets metadata, guard reads it = C [OK]

Quick Trick: Use Reflector in guards to read decorator metadata [OK]

Common Mistakes:

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