title: Can I use a model as Inline on a model where the foreign key is over another model?
body: <p>This are my models:</p>
  
  <pre><code>class Image(models.Model):
  
  class Size(models.Model):
      image = models.ForeignKey(Image)
  
  class Physical(models.Model):
      size = models.ForeignKey(Size)
  </code></pre>
  
  <p>I'm trying to add <code>Size</code> and <code>Physical</code> as an Inline on <code>ImageAdmin</code>. The user has to create some sizes, before he can add some physicals where he has to select an existing size of the image.</p>
  
  <p>Is this possible?</p>
  
  <p>Thanks and Regards,
  Silvan</p>