app/assets/javascripts/cable.js
// Action Cable provides the framework to deal with WebSockets in Rails.
// You can generate new channels where WebSocket features live using the `rails generate channel` command.
//
// require action_cable
// require_self
// require_tree ./channels
// (function() {
// this.App || (this.App = {});
// App.cable = ActionCable.createConsumer();
// }).call(this);