class Comment(Base):
    user = models.ForeignKey(‘user.User‘,on_delete=models.CASCADE,
related_name=‘user‘)
    course =
models.ForeignKey(‘course.Course‘,on_delete=models.CASCADE,related_name=‘comment‘
)
    to_user =
models.ForeignKey(‘user.User‘,on_delete=models.CASCADE,related_name=‘to_user‘,nul
l=True,blank=True)
    fid = models.ForeignKey(‘self‘,on_delete=models.CASCADE,null=True,blank=True)
    content = models.TextField()
    def __str__(self):
        return ‘%s--%s‘%(self.user.username,self.content)

comment_list: [
    {
        "id":1,
        "fid":‘‘,
        "content":"用户tom第一次评论",
        "user":"tom",
        "to_user":"tom"
    },
    {
        "id":2,
        "fid":‘1‘,
        "content":"用户张三回复tom的评论内容",
        "user":"zhangsan",
        "to_user":"tom"
    },
    {
        "id":3,
        "fid":2,
        "content":"用户tom又回复了zhangsan的评论",
        "user":"tom",
        "to_user":"zhangsan"
    },
]