Record the problems encountered by nodejs asynchronism

Record Nodejs Problems encountered in asynchrony

You need to place the order first id Find out , Then according to the order id Check order details

 public async queryOrder() {
    const sql = `select id, total from tbl_orderlines`;
    const res = await this.app.mysql.query(sql);
    const { ctx } = this;
    async function awaitTest() {
        // Apply to promise.all Method , In turn map Got promise Get value 
      await Promise.all(res.map(async item => {
        item.orderlines = await ctx.service.test.queryDetails(item.id);
        return item;
      }));
    }
    await awaitTest();
    return res;
  }