code: def pre_save_moderation(self, sender, comment, request, **kwargs):
          
          model = comment.content_type.model_class()
          if model not in self._registry:
              return
          content_object = comment.content_object
          moderation_class = self._registry[model]
  
          # Comment will be disallowed outright (HTTP 403 response)
          if not moderation_class.allow(comment, content_object, request): 
              return False
  
          if moderation_class.moderate(comment, content_object, request):
              comment.is_public = False
docs: Apply any necessary pre-save moderation steps to new
          comments.