Backbone.js can help build it. It’s a light-weight MVC for the browser – only ~1000 lines of code, and it’s clean.

In this tutorial, I'll go over the code for CloudEdit, an example Backbone.js app backed with Rails that outlines some basic patterns that I've used successfully in my Rails Backbone projects. I'll start by describing the spec for the app, and then detail how the models, controllers, and views hook up. This tutorial assumes you already have some basic knowledge about Rails — I'll be focusing mainly on the Backbone.js concepts.