project-rails is a rewrite of the projectile-rails package that uses the built-in
project.el instead of projectile.  It provides commands to navigate
Rails projects, find models, controllers, views, and other resources,
and run Rails commands like console and server.

Credit is due to Adam Sokolnicki <adam.sokolnicki@gmail.com> and the
projectile-rails project (https://github.com/asok/projectile-rails/).

To enable it for all Rails projects:

   (project-rails-global-mode)