text: from django.contrib.auth import get_user_model
  
  
  def get_user_queryset(user=None):
      if user and (user.is_superuser or user.is_staff):
          queryset = get_user_model().objects.all()
      else:
          queryset = get_user_model().objects.filter(
              is_superuser=False, is_staff=False
          )
  
      return queryset.order_by('username')
  