CreateModelMixin TypeError: __init__() takes 1 positional argument but 2 were given

Question

I'm trying to insert a new row into a 2 column table where one column references the authenticated user (model references user model via a FK) and the other being a variable passed through the url.

urls.py

url('^(?P<update>-?\d+.?\d+)/$', views.UpdateViewSet)

views.py

class UpdateViewSet(mixins.CreateModelMixin,viewsets.GenericViewSet):
    permission_classes = (IsAuthenticated,)  
    serializer_class = serializers.UpdateSerializer
    def create(self,request,*args, **kwargs):
        update = self.kwargs['update']
        return self.create(user=self.request.user,update=update)

Traceback

 File "\Backend\env\lib\site-packages\django\core\handlers\exception.py", line 34, in inner
    response = get_response(request)
  File "\Backend\env\lib\site-packages\django\core\handlers\base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "\Backend\env\lib\site-packages\django\core\handlers\base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
TypeError: __init__() takes 1 positional argument but 2 were given

class Update(models.Model):
    user = models.ForeignKey(CustomUser, on_delete=models.CASCADE)
    update = models.DecimalField(decimal_places=5,max_digits=6)

Answer 1

Since you are using class-based views--[Django Doc], you should've call as_view()--[Django Doc]

url('^(?P<update>-?\d+.?\d+)/$', views.UpdateViewSet.as_view({"post":"create"}))

---

Update-1

Change your view as below,

from rest_framework.response import Response


class UpdateViewSet(mixins.CreateModelMixin, viewsets.GenericViewSet):
    permission_classes = (IsAuthenticated,)
    serializer_class = serializers.UpdateSerializer

    def create(self, request, *args, **kwargs):
        update_instance = Update.objects.create(user=request.user, update=self.kwargs['update'])
        return Response(self.get_serializer(update_instance).data)