Make CreateModelMixin.create return the serialization of created instance

[Liorinco]

Hi!

I would like to add read_only fields using create (POST) operation from GenericViewSet mixed with CreateModelMixin.
But this option is not allowed, due to create serializes client inputs, then saves the data using the data model and returns previous serialized data, instead of newly created instance.

Why this behavior works like this? Isn't it a better solution to let people use read_only feature also for create action?

Regards,

[Liorinco]

Hi again!

Here my update suggestion:

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)
        instance = self.perform_create(serializer)
        serializer = self.get_serializer(instance=instance)
        headers = self.get_success_headers(serializer.data)
        return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)

    def perform_create(self, serializer):
        return serializer.save()

    def get_success_headers(self, data):
        try:
            return {'Location': str(data[api_settings.URL_FIELD_NAME])}
        except (TypeError, KeyError):
            return {}