title: Populate existing model objects with AutoSlugField
body: <p>I need to populate an AutoslugField for already existing model objects. My bad realized that the slug field was so handy and better that using pk for security purposes. </p>
  
  <p>I already have model objects (rows) in the database. I want to add the AutoSlugField to them. </p>
  
  <p>Anybody know how I can achieve this. </p>
  
  <p>Thanks</p>