title: URL to Active Admin edit pages
body: <p>I'm developing a rails application that administers some data with Active Admin.  One of my views exports a PDF that summarizes data in the back-end.  I'd like to link each entry in the PDF to the "edit" view in Active Admin associated with that resource.</p>
  
  <p>My question is how to get the URL to a specific Active Admin edit page for a model instance.  I can't seem to find the URLs using <code>rake routes</code> or using other methods I found in the documentation.</p>