These are Edge Guides, based on the current master branch.
If you are looking for the ones for the stable version, please check http://guides.rubyonrails.org instead.
<% else %>These are the new guides for Rails 4.2 based on <%= @version %>. These guides are designed to make you immediately productive with Rails, and to help you understand how all of the pieces fit together.
<% end %>The guides for earlier releases: Rails 4.1, Rails 4.0, Rails 3.2, and Rails 2.3.