What are some alternatives?
When comparing Node.js and Ruby on Rails, you can also consider the following products
Django - The Web framework for perfectionists with deadlines
Laravel - A PHP Framework For Web Artisans
Meteor - Meteor is a set of new technologies for building top-quality web apps in a fraction of the time.
ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Flask - a microframework for Python based on Werkzeug, Jinja 2 and good intentions.