title: Rails polymorphic naming edge cases
body: <p>I have a model called ImageGallery which can belong to many different models. Usually in rails you just suffix -able to the name to come up with the polymorphic name but here "image_galleryable" doesn't sound right. </p>
  
  <p>How should a polymorphic association be named when suffixing -able doesn't work well?</p>