gistfile1.rb

# Rails 3.X Template
if defined?(Rails) && Rails.version =~ /^3/
  module ActionView
    module Template::Handlers
      class Rabl

        class_attribute :default_format
        self.default_format = Mime::JSON

        def self.call(template)
          source = if template.source.empty?
            File.read(template.identifier)
          else # use source
            template.source
          end

          %{ ::Rabl::Engine.new(#{source.inspect}, { :format => "json"}).
              render(self, assigns.merge(local_assigns)) }
        end # call
      end # rabl class
    end # handlers
  end

  ActionView::Template.register_template_handler :rabl, ActionView::Template::Handlers::Rabl
end