soft_delete_query_set.py

class SoftDeleteQuerySet(models.QuerySet):
  @transaction.atomic
  def delete(self, snapshot_id=None):
    [x.delete(snapshot_id=snapshot_id) for x in self]


class SoftDeleteQueryManager(models.Manager):
  def __init__(self, *args, **kwargs):
    self.with_deleted = kwargs.pop('with_deleted', False)
    super(SoftDeleteManager, self).__init__(*args, **kwargs)

  # same fields and methods before except for
  def get_queryset(self):
    qs = SoftDeleteQuerySet(self.model)
    if self.with_deleted:
      return qs
    return qs.filter(is_deleted=False)