Please read for an updated status on RailsCasts:
Learn more or hide this
GitHub User: nordbit
It's not a solution. You still losing features like :prefix and searching multiwords trought multicolumns. Searching results show you "Lex Luthor" where both words are in same column. But not, when "Lex" is in one and "Luthor" in another. Ryan show faster soulution, but with limitations.