Per-template javascript include tag

helper.rb

  # useful for organizing unobtrusive javascript per template 
  # assumes layout has yield :javascripts
  # need to figure out how to invoke from the template without explicitly having to call it
  def javascript_template_include_tag
    javascript_path = "views/#{@template.template.path_without_format_and_extension}.js"
    if File.exist?(File.join(RAILS_ROOT, 'public', 'javascripts', javascript_path))
      content_for :javascripts do 
        javascript_include_tag javascript_path
      end
    end
  end