code: func ReadSetting(db *reform.Querier, key string) (string, error) {
  	var st Setting
  	if err := FindByPrimaryKeyTo(db, &st, key); err != nil {
  		return "", fmt.Errorf(
  			"failed to find '%s' setting: %s", key, err)
  	}
  	return st.Value, nil
  }
docs: // ReadSetting reads value of a given setting.