title: At which point in UpdateView is the data saved?
body: <p>I was wondering when the data given to an <code>UpdateView</code> was saved. </p>
  
  <p>I have the following situation: I update a model object via a form. I would expect the changes to the model only to be saved after the <code>UpdateView</code>'s <code>form_valid</code> is through. But when I print the object attributes right at the start of <code>form_valid</code>, they have already changed to the new ones inserted into the form. </p>
  
  <p>So when exactly is the change to the model saved and how would I go about if I wanted to do something with the previous values?</p>
  
  <p>I am relatively new to Django and I hope that this question is not too far off track.</p>