gistfile1.rb

#relevant controller

  def show
    @timer = Timer.find(params[:id])

    respond_to do |format|
      format.html
      format.js { render layout: false }
    end
  end

#relevant coffee - refreshurl has a show action path (e.g. "/timers/77")

refreshtimer = ->
  $.getScript(refreshurl)
  return null

#show.js.erb - just a test for now

alert("test");