code: def get_klass(self):
          
          # Extract the klass name from the URL arguments
          klass_name = self.kwargs.get('klass', None)
          klass = self.registry.get(klass_name, None)
          if not klass:
              raise Http404("Unknown autocomplete class `{}`".format(klass_name))
          return klass
docs: Return the agnocomplete class to be used with the eventual query.