title: changing model-path for paperclip
body: <p>I set in an initializer the save-path of paperclip to a new one and everything is fine.</p>
  
  <p>But some attachment-names (like file) are very abstract:</p>
  
  <pre><code>has_attached_file :file, :styles =&gt; {
      :thumb =&gt; "100x100"
  }
  </code></pre>
  
  <p>I want this one within the new save-path, but in a different folder than 'file'. Is that possible, without changing the attachment_name?</p>
  
  <p>For example: Now I'm have something like /save-path/file/thumb, but I want /save-path/my-new-file-name/thumb.</p>