docs: def sort_by(self, sf):
      """
      Determines how to sort search results. Available sorting methods are
      sort.SCORE, sort.COMMENTS, sort.HEIGHT, sort.RELEVANCE, sort.CREATED_AT,
      and sort.RANDOM; default is sort.CREATED_AT.
      """
      params = join_params(self.parameters, {"sf": sf})
  
      return self.__class__(**params)