django rest framework: set field-level error from serializer validate() method

Question

I have a serializer that validates fields based on the values of other fields, In the error response I would like to show each field error as a field error as opposed to showing

Answer 1

In case you are using built-in validators in DRF (which are in-fact django core validators) you have to preprocess django ValidationError coming from validator with a function get_error_detail drf is using for this purpose.

def _validate_min_value(self, data, key):
        try:
            MinValueValidator(Decimal('0.01'))(data.get(key))
        except ValidationErrorDjango as exc:
            raise ValidationError(
                {key: get_error_detail(exc)}
            )

Note that ValidationErrorDjango is a ValidationError from django.core.exceptions, while ValidationError is a one from rest_framework.exceptions