https://github.com/asok/rake.git
git clone 'git://github.com/asok/rake.git'

Rake is a package for running rake tasks in Emacs.

Once you have setup Melpa you can use package-install command to install Projectile Rails. The package name is rake.
rake commandM-x rake to run a rake task.C-u M-x rake to amend the command to run. Useful if you want to add arguments.C-u C-u M-x rake to bypass the cache (when enabled).rake-find-task commandM-x rake-find-task to find a rake task.By default rake command is not bound to any key.
You might want to do something like this:
(define-key ruby-mode-map (kbd "C-!") 'rake)
Replace (kbd "C-!") with a key of your liking.
By default the caching is enabled. To disable it:
(setq rake-enable-caching nil)
By default ido is used for completion. You can customize it with:
(setq rake-completion-system 'helm)
You can set it to ido, helm, grizzl or default for the Emacs' default completion.
Also, you can set it to the symbol of a custom command that accepts “prompt” as the first argument
and “choices” as the second argument.
Also if you are a user of Projectile you might want to just set it
to the value of projectile-completion-system like this:
(eval-after-load 'projectile
'(setq rake-completion-system projectile-completion-system))
Install cask if you haven't already, then:
$ cd /path/to/rake
$ cask
Run all tests with:
$ cask exec ecukes