code: def tagged(self, *tag_slugs):
          
          if getattr(self.model, 'tags', None) is None:
              raise AttributeError("The {0} does not include TagsEntryMixin".format(self.model.__name__))
  
          if len(tag_slugs) == 1:
              return self.filter(tags__slug=tag_slugs[0])
          else:
              return self.filter(tags__slug__in=tag_slugs).distinct()
docs: Return the items which are tagged with a specific tag.
          When multiple tags are provided, they operate as "OR" query.