gistfile1.rb

class Article < ActiveRecord::Base
  # ...
  
  define_index do
    #los indexes tienen que ser datos del tipo string
    indexes title, :sortable => true
    indexes entry
    indexes author.name, :as => :author, :sortable => true
    
    #los atributos pueden ser integer, boolean o datetime
    has author_id, created_at, updated_at
  end
  
  # ...
end