Bigg et al _ Rails 4 in Action

Rails 4 in Action is a comprehensive introduction to Rails that guides you hands-on through all you'll need to become a competent and confident Rails developer. In it, you'll master Rails 4 by developing a ticket-tracking application that includes RESTful routing, authentication and authorization, file uploads, email, and more.

Rails 3 in Action is a collaboration between Rails community leaders, Ryan Bigg and Yehuda Katz, that covers Rails 3.1 making it the most up-to-date resource available. But it's much more than just a Rails 3 reference book.