DRF - Checking for a concrete unique constraint violation when creating and/or validating an object

Solution 1:

Every type of validation should be done in DRF validation methods i.e. validate and is_valid. For your case, you should check in your validate method if any object already exists against provided data like this

def is_valid(self, raise_exception=True):
    data = self.initial_data
    if TestModel.objects.filter(fieldA=data.get('fieldA'), fieldB=data.get('fieldB').exists():
        raise serializers.ValidationError("Object already exist with {fieldA} and {fieldB}".format(**data)
    return super().is_valid(raise_exception)

DRF - Checking for a concrete unique constraint violation when creating and/or validating an object

Solution 1:

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