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Exercise

Custom model validator

You have an API to update inventory and have been asked to surface a user-friendly error message when negative quantities are input.

The RequestValidationError exception has been pre-loaded for you.

Instructions

100 XP
  • Import the annotation for custom model validation.
  • Implement a custom model validation that runs "after" the default model validations.
  • Raise a RequestValidationError exception to surface validation errors to the API user.