title: Rails 3 + Paperclip: moving current data to another folder
body: <p>As i'm new to Rails, I made the mistake of using the default path ( /system/:attachment/:id/:style/:filename ) in 4 different models. Now, i would like to move each model to its own folder but without losing old data.</p>
  
  <p>What is the proper way of handling this? Does Paperclip offer an option to automatically migrate data from old folders?</p>
  
  <p>Thanks.</p>