Question

我试图在Mongoose中使用updateMany将值重置为默认值。但是，它一直在获取500 Internal Server Error。我想念哪里？

Index.js

app.put('/reset-match',  (req, res) => {
    Activity.updateMany({}, { $set: { color: "#ffffff" }},{upsert: true}, {multi: true}, (err,doc) => { 
        if(err) {res.status(400).send(err)}
        else res.status(205).send(doc)
    }); 

});

活动模型

const mongoose = require('mongoose');
const validator = require('validator');

const Activity = mongoose.model('activity', {
    name: {
        type: String,
        required: true,
        trim: true
    },
    icon: {
        type: String, 
        required: true,
        trim: true,
        validate(value) {
            if (!validator.isURL(value)) {
                throw new Error('URL is invalid');
            }
        }
    },
    color: {
        type: String, 
        default: '#fff'
    }
})


module.exports = Activity;
```

I expect the syntax of UpdateMany which works!

Answer 1

您正试图使用太多参数调用updateMany()函数

Activity.updateMany({}, { $set: { color: "#ffffff" }},{upsert: true}, {multi: true}, (err,doc) => { ... })

基于mongoose docs，所有选项都应由一个对象传递，如下所示：

Activity.updateMany({}, { $set: { color: "#ffffff" }},{ upsert: true, limit: 20, skip: 50 }, (err,doc) => { ... })

此外，借助updateMany()功能，您无需使用multi: true选项。仅在使用update()函数时才有意义。

尝试以下代码：

    Activity.updateMany({}, { $set: { color: "#ffffff" }}, { upsert: true }, (err, data) => { 
        if (err) {
            res.status(400).send(err)
        }
        res.send(data)
    })

Answer 2

如mongoose documents中所述

这是我们的处理方式：

askUser(); function askUser(){ let answer = prompt('Hello would you please enter a number between 4 and 10?'); if( answer>4 && answer<10 ) alert('Thank you, you are awesome!') else if( answer === null ) alert('Really you can\'t think of a number between 4 and 10??!?!?') else askUserAgain(); } function askUserAgain() { let answer = prompt('This is not a number between 4 and 10, you are a fool! Please try again.'); if( answer>4 && answer<10 ) alert('Thank you, you are awesome!') else if( answer === null ) alert('Really you can\'t think of a number between 4 and 10??!?!?') else askUserAgain(); }

所以这是一个基于文档的示例：

db.collection.updateMany(condition, update, options, callback function)

这对我来说很好，希望对您有帮助：）

如何在猫鼬中使用UpdateMany

2 个答案: