class Article < ActiveRecord::Base
  thbrk # include when use plugin
  define_thai_columns :title, :body # include when use plugin
end

# app/indices/article_index.rb
ThinkingSphinx::Index.define :article, with: :real_time do
  indexes title, sortable: true
  indexes body
  indexes thbrk # include when use plugin
end

class AddThbrkColumnToArticle < ActiveRecord::Migration
  def change
    add_column :articles, :thbrk, :text
  end
end

# params[:q] is parameter from view
@articles = Article.search(params[:q].to_s.to_thbrk)