class CopyTunerClient::CopyrayMiddleware

def render_copy_tuner_bar
  if ApplicationController.respond_to?(:render)
    # Rails 5
    ApplicationController.render(:partial => "/copy_tuner_bar").html_safe
  else
    # Rails <= 4.2
    ac = ActionController::Base.new
    ac.render_to_string(:partial => '/copy_tuner_bar').html_safe
  end
end