title: Django Query set with distinct and exclude together
body: <p>I want to send notification to users who has previously commented in the request. So, for this aim, I have to find distinct users and exclude current commenter(user) id from that list. </p>
  
  <pre><code>object_id_list = ScAns.objects.filter(username=username).values_list('id',flat=True)
  </code></pre>
  
  <p>result-> QuerySet [22]</p>
  
  <pre><code>actionUsers = ScAnsAction.objects.filter(req_id=request_id).values_list('user_id',flat=True).distinct().exclude(id__in=object_id_list)
  </code></pre>
  
  <p>result-> QuerySet [13, 15, 22]</p>
  
  <p>final Result should not contain 22. It should give [13,15]</p>