title: how to update django auth_user with queryset?
body: <p>I use username='admin' and password='hash' i will update auth_user with ID table </p>
  
  <pre><code>UsermodelUpdate= User.objects.filter(id=RSAEnrcyption().decrypt_RSA(request.session['privateKEY'],GetID)).update(username='ramin')
  UsermodelUpdate.set_password(getPassWordUI)
  UsermodelUpdate.save()
  </code></pre>
  
  <p>i get error :</p>
  
  <pre><code>IntegrityError: (1062, "Duplicate entry 'ramin' for key 'username'")
  </code></pre>