【django基础】 admin列表添加下载文件按钮

class order(models.Model):
    """
    订单表
    """
    title = models.ForeignKey(to="task",verbose_name="任务标题")
    publisher = models.ForeignKey(to="UserInfo",related_name=‘publisher_id‘,verbose_name="发布者")
    money = models.IntegerField(verbose_name="悬赏虚拟币")
    receiver = models.ForeignKey(to="UserInfo",related_name=‘receiver_id‘,verbose_name="接单者")
    check_status = models.BooleanField(verbose_name="审核状态",default=0)
    status = models.BooleanField(verbose_name="完成状态",default=0)
    name = models.CharField(max_length=255,verbose_name="文件名",null=True)
    file_path = models.CharField(max_length=255,verbose_name="文件存放路径",null=True)
    create_time = models.DateTimeField(auto_now=True,verbose_name="创建时间")

    def __str__(self):
        return self.title

    def download(self):
        path = self.file_path

        button_html = "<a  href=‘{}‘>下载文件</a>".format(path)

        return format_html(button_html)

    download.short_description = format_html("""<a  href=‘#‘ style="position: relative;left: -12px;">下载文件</a>""")

    class Meta:
        verbose_name = "订单表"
        verbose_name_plural = verbose_name
        db_table = ‘order‘