cleanup.rb

class RunLater::Cleanup
  def initialize(app)
    @app = app
  end

  def call(env)
    @app.call(env)
  ensure
    RunLater::Worker.cleanup
  end
end

unless Rails.configuration.cache_classes
  ActionController::Dispatcher.middleware.push(
    ActionController::MiddlewareStack::Middleware.new(
      RunLater::Cleanup
    )
  )
end