to_check_box_tag

# File actionpack/lib/action_view/helpers/form_helper.rb, line 1083
      def to_check_box_tag(options = {}, checked_value = "1", unchecked_value = "0")
        options = options.stringify_keys
        options["type"]     = "checkbox"
        options["value"]    = checked_value
        if options.has_key?("checked")
          cv = options.delete "checked"
          checked = cv == true || cv == "checked"
        else
          checked = self.class.check_box_checked?(value(object), checked_value)
        end
        options["checked"] = "checked" if checked
        if options["multiple"]
          add_default_name_and_id_for_value(checked_value, options)
          options.delete("multiple")
        else
          add_default_name_and_id(options)
        end
        hidden = unchecked_value ? tag("input", "name" => options["name"], "type" => "hidden", "value" => unchecked_value, "disabled" => options["disabled"]) : ""
        checkbox = tag("input", options)
        (hidden + checkbox).html_safe
      end