title: Implementing search in a Ruby on Rails 3 application?
body: <p>I am writing my first Ruby on Rails application and need to implement a "search" feature. It will need to search the database (1 column per table in 3 different tables), and return the most relevant results in each of the 3 categories. Kind of like how you can do a search on Amazon.com that will return results from all the different departments.</p>
  
  <p>Is there a gem/library/common technique in the Ruby on Rails world that I should know about (that works with Rails 3)? Otherwise, what should I do in order to implement a search feature in my application?</p>