NameError Rack::Attack installing GitLab 7.2 - ruby

Question

I've got a NameError installing GitLab 7.2. More precisely when initializing the database:
$ bundle exec rake gitlab:setup RAILS_ENV=production --trace
rake aborted!
NameError: uninitialized constant Rack::Attack
/home/[user]/gitlab/config/application.rb:67:in `<class:Application>'
/home/[user]/gitlab/config/application.rb:9:in `<module:Gitlab>'
/home/[user]/gitlab/config/application.rb:8:in `<top (required)>'
/home/[user]/gitlab/Rakefile:5:in `require'
/home/[user]/gitlab/Rakefile:5:in `<top (required)>'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/lib/rake/rake_module.rb:28:in `load'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/lib/rake/rake_module.rb:28:in `load_rakefile'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/lib/rake/application.rb:687:in `raw_load_rakefile'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/lib/rake/application.rb:94:in `block in load_rakefile'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/lib/rake/application.rb:176:in `standard_exception_handling'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/lib/rake/application.rb:93:in `load_rakefile'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/lib/rake/application.rb:77:in `block in run'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/lib/rake/application.rb:176:in `standard_exception_handling'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/lib/rake/application.rb:75:in `run'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rake-10.3.2/bin/rake:33:in `<top (required)>'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/bin/rake:23:in `load'
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/bin/rake:23:in `<main>'
Yes, I found this answer discussing the error with an older version of GitLab, where the following line in config/application.rb had to be uncommented
config.middleware.use Rack::Attack
In 7.2. this line is uncommented from the start. It's there. It's apparently where rake chokes.
I renamed config/initializers/rack_attack.rb.example to config/initializers/rack_attack.rb as well.
Installing the bundle gems worked like a charm.
bundle install --deployment --without development test postgres aws
rack-attack is in the bundle's gems folder:
/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rack-attack-2.3.0/lib/rack/attack.rb
Does anyone know what could be causing this problem? Thanks a lot!
Very ugly workaround™
I added the following line to config/application.rb and it's working:
require '/home/[user]/gitlab/vendor/bundle/ruby/1.9.1/gems/rack-attack-2.3.0/lib/rack/attack.rb'
Why is this working? What's wrong? Thanks!

Answer 1

I can't add comment, so I need to post it as an answer: You need to update your ruby & gems: take a look at https://github.com/gitlabhq/gitlabhq/blob/master/doc/install/installation.md#2-ruby.
GitLab requires Ruby (MRI) 2.0 or 2.1 You will have to use the
standard MRI implementation of Ruby. We love JRuby and Rubinius) but
GitLab needs several Gems that have native extensions.