用快放方法减少服务器数量

Question

我正在努力减少数量，我必须改变mongodb数据库，我也需要在身体中显示它。我设置了一个名为"交付"的按钮，它将数量值减少1。但是当我点击交付按钮突然nodemon index.js命令崩溃。它说' ' MongoInvalidArgumentError:更新文档需要原子操作符' ';

//Client side:
const handleQuantity = (quantity) => {
const newQuantity = Number(quantity) - 1;
// console.log(newQuantity);
fetch(`http://localhost:5000/inventory/${itemsId}`, {
method: "PUT",
headers: {
'content-type': 'application/json'
},
body: JSON.stringify({ newQuantity })
})
.then(res => res.json())
.then(data => console.log(data))
}
//server side: 
app.put('/inventory/:id', async (req, res) => {
const id = req.params.id;
const property = req.body;
const query = { _id: ObjectId(id) };
const options = { upsert: true };
const updateDoc = {
$set: {
quantity: property.newQuantity
}
};
const result = await inventoryCollection.updateOne(query, options, updateDoc);
res.send(result)
})```

Answer 1

客户端:

const handleQuantity = (quantity) => {
const newQuantity = parseInt(quantity) - 1;
// console.log(newQuantity);
fetch(`http://localhost:5000/inventory/${itemsId}`, {
method: "PUT",
headers: {
'content-type': 'application/json'
},
body: JSON.stringify({ newQuantity })
})
.then(res => res.json())
.then(data => console.log(data))
}