Important Information
About Rails Versions
Rails is an evolving framework. The core Rails developers are continually
m
aking changes, adding new features, fixing bugs, and so on. P eriodically
they package up the latest version of Rails into a release. These releases are
then available to application developers as RubyGems.
This book is written for Rails 1.2.
As the book is going to press the core team have crea ted the codebase for
Rails 1.2. However, they have not yet packaged it into a gem. This gives us a
bit of a problem. We want the book to reflect all the latest and greatest Rails
features, but we also know that it is hard for folks to jump through the hoops
required to get the so-called Edge version of Rails installed on their systems.
And until a gem is availa b le, the 1.2 features are only a vailable in Edge Rails.
Now, i t may well be that by the time you get your hands on this book, the
Rails 1.2 gem is out. It’s easy to find out. After you’ve installed Ra ils (as
described in Chapter 3, I
nstalling Rails,
on page 31), bring up a command
prompt and enter
rails -v. If it reports “Rails 1.2” or la ter, you’re fine.
If
instead you see something like “Rails 1.1.6,” you’ll need to upd ate to get
the code in this b ook to run. We’ve prepared a snapshot of the Rails frame-
work code that we used when writing this book. You can install it in y our
own Rails applications as a temporary measure until 1.2 is released.
• Create your applica tion normally. You’ll find that it will contain a direc-
tory called vendor
• Download http://media.pragprog.com/titles/rails2/code/rails.z
ip into your
application’s
vendor directory and unzip it. It should create a new direc-
tory called
rails
• In your applica tion’s top-level directory, issu e the comman
d
rake rails:update
Once Rails 1.2 is released, you can install it and remove the directory tree
vendor/rails from your applications.
The version of Rails from our web site is not an official release, and should
not be used in producti on applications.
Dave Thomas
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