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You want to create a custom serializer field that accepts a comma-separated string of numbers and outputs a list of integers. Which methods should you override and how?

hard📝 Application Q15 of 15
Django - DRF Advanced Features
You want to create a custom serializer field that accepts a comma-separated string of numbers and outputs a list of integers. Which methods should you override and how?
AOverride to_internal_value to split and convert input string; override to_representation to join list into string
BOverride to_representation to split input string; override to_internal_value to join list
COverride validate to convert string to list; no need to override to_representation
DOverride create method to parse string; override update to format list
Step-by-Step Solution
Solution:

  1. Step 1: Understand input and output roles

    Input is a string (comma-separated), so to_internal_value must parse it into a list of integers.

  2. Step 2: Format output for API response

    to_representation should convert the list back into a comma-separated string for output.

  3. Final Answer:

    Override to_internal_value to split and convert input string; override to_representation to join list into string -> Option A

  4. Quick Check:

    Input parsing = to_internal_value, output formatting = to_representation [OK]
Quick Trick: Parse input in to_internal_value, format output in to_representation [OK]
Common Mistakes:
MISTAKES
  • Swapping input/output methods
  • Using validate instead of conversion methods
  • Overriding create/update which are unrelated

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