  from django.db import models
  # from django.contrib.auth.models import Group
  
  
  # class CustomUser(models.Model):
  #     """
 
</s> remove         return self.model_field.value_to_string(self.obj)
 </s> add         return self.model_field.value_to_string(obj)
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes.generic import GenericForeignKey, GenericRelation

  from django.db import models
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes.generic import GenericForeignKey, GenericRelation

  # from django.contrib.auth.models import Group
  
  
  # class CustomUser(models.Model):
  #     """
add keep keep keep keep keep
 Fix for field to make it easier to access field relationships 
rest_framework/tests/models.py