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I can't speak for other books, but by design the Ruby on Rails 3 Tutorial book is robust against this kind of change. The trick is to use explicit gem version numbers for everything. (I learned this lesson the hard way by watching my first book, RailsSpace, quickly go out of date.) Moreover, the differences between Rails 3.1 and Rails 3.0 are relatively minor, especially when considering how applications are structured. The Rails 3.0 knowledge you learn is still 100% useful.

That being said, I'm currently working on a Rails 3.1 version of the book. Stay tuned to http://news.railstutorial.org/ to get an announcement when it's ready.




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