title: Django - How to specify 'NOT IN' in 'limit_choices_to'?
body: <p>How to specify 'NOT IN'  in 'limit_choices_to'? I just want to fetch all the customer details except if they are in one particular status.</p>
  
  <pre><code>customer = models.ForeignKey(Customer, limit_choices_to={'status__in': ['active']}) 
  </code></pre>