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Why might a FastAPI PUT route silently overwrite existing data without error when updating an item?

hard🧠 Conceptual Q10 of 15
FastAPI - Database Integration
Why might a FastAPI PUT route silently overwrite existing data without error when updating an item?
ABecause PUT replaces the entire resource, missing fields get removed
BBecause PUT only updates specified fields, leaving others intact
CBecause FastAPI automatically merges old and new data
DBecause PUT requests are ignored if item exists
Step-by-Step Solution
Solution:

  1. Step 1: Understand PUT semantics

    PUT replaces the entire resource, so fields not included are removed.

  2. Step 2: Contrast with PATCH

    PATCH updates only specified fields, preserving others.

  3. Final Answer:

    Because PUT replaces the entire resource, missing fields get removed -> Option A

  4. Quick Check:

    PUT replaces whole resource [OK]
Quick Trick: PUT replaces whole resource; PATCH updates parts [OK]
Common Mistakes:
MISTAKES
  • Thinking PUT merges data
  • Assuming PUT ignores existing data
  • Confusing PUT with PATCH

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