              model_cls = queryset.model
  
          assert model_cls, '`base_name` argument not specified, and could ' \
              'not automatically determine the name from the viewset, as ' \
              'it does not have a `.model` or `.queryset` attribute.'
  
          return model_cls._meta.object_name.lower()
  
      def get_routes(self, viewset):
          """
 
</s>
            'it does not have a `.queryset` attribute.'
              model_cls = queryset.model
  
          assert model_cls, '`base_name` argument not specified, and could ' \
              'not automatically determine the name from the viewset, as ' \
            'it does not have a `.queryset` attribute.'
  
          return model_cls._meta.object_name.lower()
  
      def get_routes(self, viewset):
          """
keep keep keep keep replace keep keep keep keep keep
 Deprecate .model in related routers/permissions
rest_framework/routers.py