how connect sql server on ruby programming?

Here is what I did, after finally finding and reading this: https://rails.lighthouseapp.com/projects/8994/tickets/5250-subclassesdescendants-is-not-a-symbol

1.gem uninstall deprecated
2.gem install rails-dbi
3.Put this into your gemfile: gem 'rails-dbi', :require => 'dbi'
4.bundle update
5.It will show that it re-installs deprecated, but it did not seem to cause harm.
6.Your app should run