docs: def check_query_data(self, query_data):
          """
          All items in a `querylist` must at least have `queryset` key and a
          `serializer_class` key. Any querylist item lacking both those keys
          will raise a ValidationError
          """
          for key in self.required_keys:
              if key not in query_data:
                  raise ValidationError(
                      'All items in the {} querylist attribute should contain a '
                      '`{}` key'.format(self.__class__.__name__, key)
                  )