falm/js-namespace-rails

module ActionView::Helpers::AssetTagHelper

  # load twice will raise exception 'stack level too deep'
  unless defined?(:javascript_include_tag_without_controller)    
    alias_method :javascript_include_tag_without_controller, :javascript_include_tag

    def javascript_include_tag(*source)

      if defined?(controller_path) && !@_included
        @_included = true
        concat javascript_tag(insert_hook_script, defer: 'defer')
      end
      javascript_include_tag_without_controller(*source)
    end
  end

end