def METHOD_NAME(self):
    # delete any existing automatically-created redirects that might clash
    # with the items in `self.items`
    clashes_q = Q()
    for item in self.items:
        clashes_q |= Q(old_path=item.old_path, site_id=item.site_id)
    Redirect.objects.filter(automatically_created=True).filter(clashes_q).delete()