ruby-actionpack binary package in Ubuntu Precise amd64

 Action Pack splits the response to a requests into a controller part
 (performing the logic) and a view part (rendering a template). This
 two-step approach is known as an action, which will normally create,
 read, update, or delete (CRUD for short) some sort of model part
 (often backed by a database) before choosing either to render a
 template or redirecting to another action.
 .
 This is empty dependency package which depends on the default Debian
 version of rails framework. If you need to depend on a specific version
 of rails, you need to depend on <package>-VERSION package.

Source package