If you are using Ferret for Rails full text search, never forget to do the following:

gem install acts_as_ferret (duh!)

If this works with your Rails install - fine. Don't go on and change a winning team. If it doesn't work (e.g. when you do a rake db:migrate and you get

no such file to load - ferret


do the following

gem install ferret

and you should be fine.