You can't get them in PDF, but you can get them in HTML form by running these commands:
git clone git://github.com/rails/rails.git
cd rails
git checkout origin/3-2-stable -b 3-2-stable
cd railties/guides
ruby rails_guides.rb
cd output
open index.html
When these commands have finished you should be in the railties/guides/output
folder which contains the HTML versions of the guides that were just generated with ruby rails_guides.rb
, and if you're on a decent operating system then you'll see the homepage in your default browser.