在Django中保存时迁移模型对象

Question

我想在Django中创建两个模型

class BlogPost(models.Model):
    body = models.TextField()
    delete = models.BooleanField(default=True)

    def save(self, *args, **args):
        if self.delete():
            # move object to Post Archive

class BlogPostArchive(BlogPost):
    date_deleted = models.DateTimeField(auto_now_add=True)

如何定义将需要删除的BlogPost对象迁移到存档中的方法？