title: Build a two-stage Django admin form for adding an object?
body: <p>Is it possible to build a two-stage form for creating an object in Django admin?</p>
  
  <p>When an admin user visits <code>/admin/my-app/article/add/</code>, I'd like to display some options. Then, the app would display the creation page with pre-calculated fields based on the selections made. </p>