Ruby on Rails 2.2 includes many new features and improvements, as well as fixed some bugs. In this book you will find a brief introduction to each change in the new version of Rails and an example (mostly). I hope this book helps you understand the new version of Rails. In the new version, Rails adds multi-language features. With the new internationalization system (i18n), you can easily create internationalized applications for your users. Rails developers have spent a lot of time making Rails thread-safe and adding support for the new version of Ruby (1.9). A lot of effort has also been put into making Rails and Jruby more compatible. Although multi-threading mode is not available to everyone yet, and it currently only works on virtual machines with local thread support (like Jruby), it is an important new feature.
