post_delete未被调用

Question

Django 1.11.7 Python 3.6.5

我尝试在删除模型时实现以下代码来删除文件。 但是没有调用post_delete。

@receiver(post_delete, sender=HogeFileModel, dispatch_uid=uuid.uuid4())
@receiver(post_delete, sender=FugaFileModel, dispatch_uid=uuid.uuid4())
def auto_delete_file_on_delete_part_file(sender, instance, using, **kwargs):
    print('Called post_delete')
    if instance.file:
        if os.path.isfile(instance.file.path):
            os.remove(instance.file.path)

如何解决？