actionview/lib/action_view/helpers/tags/radio_button.rb


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require "action_view/helpers/tags/checkable"

module ActionView
  module Helpers
    module Tags # :nodoc:
      class RadioButton < Base # :nodoc:
        include Checkable

        def initialize(object_name, method_name, template_object, tag_value, options)
          @tag_value = tag_value
          super(object_name, method_name, template_object, options)
        end

        def render
          options = @options.stringify_keys
          options["type"]     = "radio"
          options["value"]    = @tag_value
          options["checked"] = "checked" if input_checked?(object, options)
          add_default_name_and_id_for_value(@tag_value, options)
          tag("input", options)
        end

        private

          def checked?(value)
            value.to_s == @tag_value.to_s
          end
      end
    end
  end
end