  
      def save_object(self, obj, **kwargs):
          obj.save(**kwargs)
  
      def delete_object(self, obj):
          obj.delete()
  
      def save(self, **kwargs):
          """
          Save the deserialized object and return it.
 
</s> remove                  allow_delete=False, **kwargs):
 </s> add                  allow_add_remove=False, **kwargs):
        if self.allow_add_remove and hasattr(obj, '_removed_relations'):
            [self.delete_object(item) for item in obj._removed_relations]

  
      def save_object(self, obj, **kwargs):
          obj.save(**kwargs)
  
        if self.allow_add_remove and hasattr(obj, '_removed_relations'):
            [self.delete_object(item) for item in obj._removed_relations]

      def delete_object(self, obj):
          obj.delete()
  
      def save(self, **kwargs):
          """
          Save the deserialized object and return it.
keep keep keep add keep keep keep keep keep keep
 one-many writable nested modelserializer support 
rest_framework/serializers.py