无限极分类

# 商品种类表
class Cate(models.Model):
    name = models.CharField('种类名称', max_length=30)
    # 自己链接自己 
    cid = models.ForeignKey('self', on_delete=models.CASCADE, related_name='subs', null=True, blank=True)

    def __str__(self):
        return self.name

    class Meta:
        db_table = 'cate'


# 分类分组
class Group(models.Model):
    name = models.CharField('频道组名称', max_length=30)
    # 1:1模型类
    cate = models.OneToOneField(Cate, on_delete=models.CASCADE, related_name='一级类别')
    group_url = models.CharField('频道组地址', max_length=200, default=' http://jd.com')
    sequence = models.IntegerField('展示顺序', default=0)

    def __str__(self):
        return self.name

    class Meta:
        db_table = 'group'