为什么mongoose不等待await new MODEL.save()

Question

我有2个服务器，其中一个工作得很好，但第二个(第一个的修改变体)不是

' This isnot works:

router.post("/", async (req, res, next) => {
const newBriefAppeal = await new BriefAppeal(req.body);
let appealId;
let target;
let goals;
let brand;
let ***;
try {
const savedBriefAppeal = await newBriefAppeal.save(function (err, appeal) {
appealId = appeal.id;
target = appeal.step01target;
goals = appeal.step02goals;
brand = appeal.step03brand;
*** = appeal.***
});
res.status(200).json(savedBriefAppeal);
} catch (err) {
res.status(500).json(err);
}
});

'得到error

node:events:491
throw er; // Unhandled 'error' event
^
TypeError: Cannot read properties of undefined (reading 'id')

'但是这个变体在我类似的项目中工作得很好:

router.post("/", async (req, res, next) => {
const newAppeal = await new Appeal(req.body);
let appealId;
let name;
let email;
let phone;
let subject;
let message;
let attachments = [];
try {
const savedAppeal = await newAppeal.save(function (err, appeal) {
appealId = appeal.id;
name = appeal.name;
email = appeal.email;
phone = appeal.phone;
subject = appeal.subject;
message = appeal.text;
attachments = appeal.appealAttach.map((attachment) => ({
filename: attachment,
path: "./uploads/media/mailAttachments/" + attachment,
}));
});
res.status(200).json(savedAppeal);
} catch (err) {
res.status(500).json(err);
}
});

我哪里错了，为什么我的诉求没有定义?

Answer 1

因为你传入了一个回调。正如文档中所说，save只在不时返回承诺。传入一个回调:

的回报:

…如果与回调或承诺一起使用，则返回undefined。

使用旧式的回调签名或使用promise特性