def field_value
      opts = selected_options
      opts.count == 1 ? opts.first.text : opts.map(&:text)
    end
def field_value
      opts = selected_options
      opts.count == 1 ? opts.first.text : opts.map(&:text)
    end
Selected option(s) of this Select.
 @return [String, Array<String>] if only one option is selected, return it as string,
                                 otherwise, return it as an array of strings.