javascript - 部分 API 在 NodeJS 中不起作用。我如何解决它？

Question

我正在尝试在 NodeJS 中为在线商店构建 REST API。我的 POST 请求代码如下所示:

router.post('/', (req, res, next) => {
    const order = new Order({
        _id: new mongoose.Types.ObjectId(),
        customer_name: req.body.order.customer_name,
        total_price: req.body.order.total_price,
        products: req.body.order.products,
    });
    order
    .save()
    .then(result => {
        req.body.order.products.forEach(value => {
            let availiableQuantity = value.available_quantity - value.ordered_quantity;
            Product.findOneAndUpdate({ id: value.id }, { available_quantity: availiableQuantity 
      })
     })
     res.status(201).json({
            message: "Successfully created product",
            createdProduct: {
                customer_name: result.customer_name,
                products: result.products,
        }
      });
    })
  .catch(err => {
        console.log(err);
        res.status(500).json({
            error: err
        });
    });
});

我遇到的问题是，当我尝试发送此 POST 请求时，.then block 中的代码不起作用，即使我尝试 console.log 某些内容，它不执行任何操作，除了 .then block 中的代码之外，一切正常:

.then(result => {
        console.log('test')
        req.body.order.products.forEach(value => {
            let availiableQuantity = value.available_quantity - value.ordered_quantity;
            Product.findOneAndUpdate({ id: value.id }, { available_quantity: availiableQuantity 
      })
    })

我错过了什么吗？

Answer 1

您可以使用 async wait，而不是使用 then block 处理下一步。

 router.post('/',async (req, res) => {
  try{
   const order = new Order({
    _id: new mongoose.Types.ObjectId(),
    customer_name: req.body.order.customer_name,
    total_price: req.body.order.total_price,
    products: req.body.order.products,
  });
  var result = await order.save();
  req.body.order.products.forEach(value => {
        let availiableQuantity = value.available_quantity - 
 value.ordered_quantity;
        Product.findOneAndUpdate({ id: value.id }, { 
 available_quantity: availiableQuantity 
 })
 res.status(201).json({
        message: "Successfully created product",
        createdProduct: {
            customer_name: result.customer_name,
            products: result.products,
    }
  });
  } catch(e) {
   res.status(500).json({
        message: "Bad request",
        error: e
  });
 }
})