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This review is from: Ruby on Rails for Dummies (Paperback)
I should have paid more attention to the 2008 review which said that this book was outdated even then. In 2011 it is certainly outdated. It is difficult to follow the exercises as those versions of the software are no longer available. There is some help on the book's own web page but this is rather limited and it is itself out of date.
The Dummies series is usually excellent but this one should be withdrawn and replaced by a new edition.