title: Updating rails to 3.1.1 i get uninitialized constant Product::RAILS_ROOT
body: <p>After updating from 3.0.1 to 3.1.1 my application according the relevant <a href="http://railscasts.com/episodes/282-upgrading-to-rails-3-1" rel="noreferrer">railscast</a> i seem to get this:</p>
  
  <p>uninitialized constant Product::RAILS_ROOT</p>
  
  <p>Product is my main object  </p>