render

# File actionview/lib/action_view/helpers/tags/radio_button.rb, line 16
        def render
          options = @options.stringify_keys
          options["type"]     = "radio"
          options["value"]    = @tag_value
          options["checked"] = "checked" if input_checked?(options)
          add_default_name_and_id_for_value(@tag_value, options)
          tag("input", options)
        end