title: Rails: turn existing Paperclip attachments into Image class
body: <p>If I have lots of different kinds of Paperclip-attached images spread over several different models in a production environment, and I want to remove the attachments from those models and create an <code>Image</code> class that can have a relationship to those models, how can I do that?</p>
  
  <p>Like, I can create the <code>Image</code> class and all, but how can I best translate the attribute-based solution into a relationship-based one so I don't lose existing images for specific records?</p>
  
  <p>All advice welcomed. Thanks.</p>