actionpack/lib/action_view/template_handlers/builder.rb


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require 'builder'

module ActionView
  module TemplateHandlers
    class Builder < TemplateHandler
      def compile(template)
        content_type_handler = (@view.send!(:controller).respond_to?(:response) ? "controller.response" : "controller")
        "#{content_type_handler}.content_type ||= Mime::XML\n" +
        "xml = Builder::XmlMarkup.new(:indent => 2)\n" +
        template +
        "\nxml.target!\n"
      end
    end
  end
end