Ruby on Rails is an open source web framework. It's famously simple to build a basic Rails application. Once you've started down the track, however, you discover that Rails is a powerful, deep, and rich full-stack platform capable of tackling virtually any development challenge. "Rails 4 in Action" is a fully-revised second edition of "Rails 3 in Action." This hands-on, comprehensive introduction to Rails gives readers everything they need to become competent and confident Rails developers. It shows how to develop a ticket tracking application that includes RESTful routing, authentication and authorization, file uploads, email, and more. It explores powerful features like designing APIs and building a Rails engine. The book also provides Test Driven Development and Behavior Driven Development in action throughout the book--just like in a top Rails shop. Purchase of the print book includes a free eBook in PDF, Kindle, and ePub formats from Manning Publications.