This application is a clone of Stackoverflow Clone written as an example code
Stack:
- Testing: integration tests, unit tests, tested by json, API, background jobs.
 - Mailers gems: rspec. capybara, lurker, json spec, shoulda-matchers.
 - Authorization: devise.
 - Authentication: cancancan.
 - Ajax: jquery, skim.
 - Comet and Pub/Sub: private_pub.
 - Authorization through social network (facebook, twitter): omniauth.
 - Implemented: REST API for questions, answers, profile.
 - Included: Nested Forms and polymorphic associations.
 - Background jobs: sidekiq.
 - Full-text search on Sphinx: thinking-sphinx.
 - Deploy: Capistrano the server was configured, Ngnix, Passenger, and then Unicorn, Monit, backup.