报错：nodejs.TypeError: Converting

 // 获取分类
  async getCategory () {
    const categorys = await Category.findAll({
      where: {
        delete_time: null
      }
    });

    let father = categorys.filter( item => item.pid === 0);
    let son = categorys.filter( item => item.pid !== 0);
    let data = [];
    // forEach 不支持 async await
    for(let item = 0; item < father.length; item++){
      let children, currentItem;
      for(let i = 0; i< son.length; i++){
        if(son[i].pid === father[item].id){
          currentItem = son[i];
          break;
        }
      }

      const attr = await Attr.findAll({
        where: {
          cate_id: currentItem.id,
        }
      })
      children = {
        ...currentItem,
        attr
      }
      let obj = {
        ...item.dataValues,
        children
      }
      data.push(obj)
    }

    return data;
  }

思考： ...currentItem 他是一个浅拷贝，会造成循环引用对象

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