DRF not catching nor handling IntegrityErrors

[alvaroscelza]

Hello Everyone!
Here is my question.

When using viewsets.ModelViewSet I expect DRF to properly handle IntegrityErrors that rise from sending wrong data in an attempt to create a model.

For instance: I have this model.

class Paddock(UniqueNameMixin):
    class Meta(UniqueNameMixin.Meta):
        verbose_name = _('paddock')
        verbose_name_plural = _('paddocks')

    establishment = models.ForeignKey(Establishment, models.CASCADE, verbose_name=_('establishment'))
    hectares = models.PositiveIntegerField(_('hectares'), default=0)

As you can see, this is expecting a positive integer for hectares, and therefore, it will raise an IntegrityError when passing a negative value, like -500. Nonetheless DRF will not catch that error, resulting in a 500 error.

I suggest we handle this in the CreateModelMixin, changing its current code, which at the moment is:

class CreateM
class CreateModelMixin:
    """
    Create a model instance.
    """
    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        self.perform_create(serializer)
        headers = self.get_success_headers(serializer.data)odelMixin:
    """
    Create a model instance.
    """
    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        self.perform_create(serializer)
        headers = self.get_success_headers(serializer.data)
        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers

this is related to https://stackoverflow.com/questions/35290453/django-rest-framework-integity-error-catch

[alvaroscelza]

Never mind, there is already an even better solution:
https://stackoverflow.com/a/74504921/5750078

basically: DRF allows you to configure a custom exception handler. Look in that answer for how to.