if location_id:

            form.fields["location"].queryset = Location.objects.filter(pk=location_id)

            form.fields["location"].widget.attrs["readonly"] = True

        return form

    def get_initial(self):

    # Raise authorisation denied exception for unmet permissions.

    raise_exception = True

class EntityDeleteView(MultiplePermissionsRequiredMixin, DeleteView):

    """

        self.success_url = reverse("entity", args=(self.get_object().entity.id,))

        return super(InterfaceDeleteView, self).delete(*args, **kwargs)