The Rails framework is constantly being updated. As a result, any book about it is bound to need the occasional update. On this page, you’ll find links to changes in Rails that affect the book “Agile Web Development with Rails
Even though Rails 3.1 is purportedly only a minor release and includes few major internal changes (certainly as compared to the changes made between Rails 2.3.x and Rails 3.0), it contains a significant number of user-facing changes that affect this book. As such, the Pragmatic Bookshelf team decided to update this book to reflect these changes.