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Sam Ruby, Dave Tomas “Agile Web Development with Rails, Third Edition,Digital Beta"

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About Rails Versions

This book is written for Rails 2. As this printing of the book is going to press,the current generally available Gem version of Rails is 2.1. The code in this

book has been tested against this version.

This book started life with the same text as the Second Edition, which covered Rails 1.2.6. Pages containing this original text have a gray heading and

footer. As we migrate content to Rails 2, you’ll find the header color changes to red. The Third Edition preface contains a table summarizing the status

of this update process. In particular, note that in many of the chapters the screenshots have not yet been updated to match the results produced by

Rails 2.1.

The Rails core team is continuing to work on Rails 2. From time to time, new releases may introduce incompatibilities for applications written for prior

versions of Rails. In order to experiment with these changes, the Rails developers are making the changes available via Edge Rails (discussed starting on

page 244). These changes won’t affect you unless you explicitly install this experimental code—you won’t find yourself running it unless you overide

Gem defaults or deliberately choose to use Edge Rails. However, if you do decide to run this experimental Rails code, you’ll find that some stuff in this

book (and some stuff in your existing Rails applications) may no longer run. To determine the version of Rails that you are running, you can issue rails -

at a command prompt.

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