IntegerField with choices and null

[Milorad Pop-Tosic]

Hello,

I have a Django model with IntegerField with choices, and null=True, blank=True. I've written a simple

CreateAPIView and a serializer for the model. I haven't overriden any fields in the serializer.

The only issue I'm having is when I'm adding objects by using the form in the API browser and I leave

the choices field blank (the form correctly displays the blank option). I get the following exception:

invalid literal for int() with base 10: ''

I've tried overriding the field in the serializer with ChoiceField from Django Rest Framework and

setting required=False, but this doesn't work either.

Since everything works fine when I use the API with JSON, this is a minor issue, but I'd like to

know why it isn't working as expected.

Thanks in advance,

Milorad

[Joseph Wayodi]

Hello,

I also just came across this issue.

My current workaround is, in my Django REST framework model viewset subclass, I check the object for the Django model integer fields that are optional, and that have the value "" (set by the Django REST framework's serializer choice field on an empty selection), and then set them back to None, as required. Below is the code snippet:

from django.db.models.fields import IntegerField

from rest_framework import viewsets

class BaseModelMixin(viewsets.ModelViewSet):

    def pre_save(self, obj):

        super(BaseModelMixin, self).pre_save(obj)

        for field in obj._meta.fields:

            if isinstance(field, IntegerField) and field.null and field.blank and getattr(obj, field.name) == '':

                setattr(obj, field.name, None)

Does anyone have a better way of doing it?

Regards,

Joseph.