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Why is it important to use the reflector's getAllAndOverride method when implementing a RolesGuard in NestJS?

hard📝 Conceptual Q10 of 15
NestJS - Authentication
Why is it important to use the reflector's getAllAndOverride method when implementing a RolesGuard in NestJS?
AIt caches roles metadata for faster access
BIt automatically validates user roles against database
CIt retrieves roles metadata from both method and class, allowing overrides
DIt logs role access attempts for auditing
Step-by-Step Solution
Solution:

  1. Step 1: Understand reflector.getAllAndOverride purpose

    This method fetches metadata from the method first, then class, allowing method-level override.

  2. Step 2: Compare with other options

    It does not cache, validate roles, or log access; those are unrelated functions.

  3. Final Answer:

    It retrieves roles metadata from both method and class, allowing overrides -> Option C

  4. Quick Check:

    getAllAndOverride merges metadata from method and class [OK]
Quick Trick: Use getAllAndOverride to merge method and class roles metadata [OK]
Common Mistakes:
  • Thinking it caches metadata
  • Assuming it validates roles automatically
  • Confusing it with logging functionality

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