title: Belongs_to different field name
body: <p>I've inherited quite a weird table layout:</p>
  
  <pre><code>callbacks
  id, note, user
  
  admin
  id, name, password
  </code></pre>
  
  <p>In callbacks, the user is set to the name of the admin rather than the actual ID. Now I need to be able to call <code>callbacks.user</code> and have rails lookup the admin with that name and then bind it to that record.</p>
  
  <p>I have a model for <code>admin</code> that is called <code>users</code></p>
  
  <p>How would I go about that?</p>