"It's early days for the language so it's no surprise there's only a handful of books out there. Yet it's hard to see why you would need anything more than Agile Web Development with Rails. Programming books, in particular, rarely seem to answer queries straight away, but this one tackles the myths surrounding Rails straight off, and in plain English. But don't panic, it's not a Dummies guide - it will teach you how to use Rails to eliminate tedious web app configuration and, crucially, how to integrate it into AJAX." .NET, December 2005
You'll create a complete online store application in the extended tutorial section, so you'll see how a full Rails application is developed - iteratively and rapidly. Rails strives to honor the Pragmatic Programmer's "DRY Principle" by avoiding the extra work of configuration files and code annotations. You can develop in real-time: make a change, and watch it work immediately. Forget XML. Everything in Rails, from templates to control flow to business logic, is written in Ruby, the language of choice for programmers who like to get the job done well (and leave work on time for a change). Rails is the framework of choice for the new generation of Web 2.0 developers. "Agile Web Development with Rails" is the book for that generation, written by Dave Thomas (Pragmatic Programmer and author of "Programming Ruby") and David Heinemeier Hansson, who created Rails.