old_contents: from django.db import models
  
  
  class BasisModelManager(models.Manager):
      def get_query_set(self):
          return super(BasisModelManager, self).get_query_set().filter(deleted=False)
  
new_contents: from django.db import models
  from .compat import DJANGO16
  
  
  if DJANGO16:
      class BasisModelManager(models.Manager):
          def get_queryset(self):
              return super(BasisModelManager, self).get_queryset().filter(deleted=False)
  else:
      class BasisModelManager(models.Manager):
          def get_query_set(self):
              return super(BasisModelManager, self).get_query_set().filter(deleted=False)
  
subject: Fix deprecation warning for get_query_set