This is my first Ruby on Rails app, and it was inspired by the Seattle RailsBridge Intro to Rails workshop. It runs with Ruby 1.9.3 and Rails 4.0.2.
The Suggestotron lets people up vote items in a list. After following the directions in the tutorial, I figured out how to add a "-1" button, sort the list by vote order, and remove the "-1" button when the votes were 0, so that the vote count would not go below 0.