title: Why do some "Plain Old Ruby Objects" go in app/models directory instead of lib direcory?
body: <p>I am working on a project where the current developers have put their "Plain Old Ruby Objects" in the <code>models</code> directory of our Rails app.</p>
  
  <p>I have seen most examples online where the PORO files go inside <code>lib</code> instead, but some say models.</p>
  
  <p>Is there even a logical / specific reason why people put them in the <code>models</code> directory over the <code>lib</code> directory?</p>