报错提示TypeError: User.remove is not a function

const removeResult = await User.remove(({username:'list'}))

慕田峪1427181 2023-03-16

源自：MongoDB数据库 3-14 mongoose-更新和删除

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1回答

好帮手慕久久 2023-03-16 13:21:28

同学你好，建议检查模型User是否引入。如果自己查不出来，建议将该js中的代码、model.js中的代码都粘贴出来，老师测试一下。

祝学习愉快！

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提问者慕田峪1427181 #1

const {User} = require('./model')

!(async () =>{
    // const updateResult = await  User.findOneAndUpdate(
    //     {username:'zhangsan'},
    //     {age:25},
    //     {
    //         new:true
    //     }
    // )
    // console.log('更新的返回结果',updateResult);

    const removeResult = await  User.removeResult(({username:'list'}))
    console.log('删除返回结果',removeResult);
})()



//数据模型(规范数据格式)

const mongoose = require('./db')
//定义schema (数据规范)

const UserSchema = mongoose.Schema({
    username:{
        type:String,
        required:true,
        unique:true
    },
    password:String,
    age:Number,
    city:String,
    //性别
    gender:{
        type:Number,
        default:0
    }
},{
    timestamps:true //
})
//定义model
const User = mongoose.model('user',UserSchema)

module.exports = {
    User
}



const mongoose = require('mongoose')

const url = 'mongodb://localhost:27017'
const dbName = 'comment2'



mongoose.connect(`${url}/${dbName}`,{
    useNewUrlParser:true,
    useUnifiedTopology:true
})

const conn = mongoose.connection

conn.on('error',err =>{
    console.error('mongoose 连接出错',err);
})

module.exports = mongoose //commonjs




{
  "name": "test4",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "start": "node bin/www",
    "dev": "./node_modules/.bin/nodemon bin/www",
    "prd": "pm2 start bin/www",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "dependencies": {
    "debug": "^4.1.1",
    "koa": "^2.7.0",
    "koa-bodyparser": "^4.2.1",
    "koa-convert": "^1.2.0",
    "koa-json": "^2.0.2",
    "koa-logger": "^3.2.0",
    "koa-onerror": "^4.1.0",
    "koa-router": "^7.4.0",
    "koa-static": "^5.0.0",
    "koa-views": "^6.2.0",
    "mongoose": "^7.0.1",
    "pug": "^2.0.3"
  },
  "devDependencies": {
    "nodemon": "^1.19.1"
  }
}

2023-03-17 11:37:56

提问者慕田峪1427181 #2

F:\代码练习\代码练习\Nodejs\test4\db>node test2.js
F:\代码练习\代码练习\Nodejs\test4\db\test2.js:13
    const removeResult = await  User.remove(({username:'list'}))
                                     ^

TypeError: User.remove is not a function
    at F:\代码练习\代码练习\Nodejs\test4\db\test2.js:13:38
    at Object.<anonymous> (F:\代码练习\代码练习\Nodejs\test4\db\test2.js:15:3)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12)
    at node:internal/main/run_main_module:17:47

F:\代码练习\代码练习\Nodejs\test4\db>

const {User} = require('./model')

!(async () =>{
    // const updateResult = await  User.findOneAndUpdate(
    //     {username:'zhangsan'},
    //     {age:25},
    //     {
    //         new:true
    //     }
    // )
    // console.log('更新的返回结果',updateResult);

    const removeResult = await  User.remove(({username:'list'}))
    console.log('删除返回结果',remove);
})()

2023-03-17 11:50:05

提问者慕田峪1427181 #3
TypeError: User.remove is not a function
at F:\代码练习\代码练习\Nodejs\test4\db\test2.js:13:38
at Object.<anonymous> (F:\代码练习\代码练习\Nodejs\test4\db\test2.js:15:3)
at Module._compile (node:internal/modules/cjs/loader:1105:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
at Module.load (node:internal/modules/cjs/loader:981:32)
at Function.Module._load (node:internal/modules/cjs/loader:822:12)
at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12)
at node:internal/main/run_main_module:17:47

F:\代码练习\代码练习\Nodejs\test4\db>
```
const {User} = require('./model')

!(async () =>{
    // const updateResult = await  User.findOneAndUpdate(
    //     {username:'zhangsan'},
    //     {age:25},
    //     {
    //         new:true
    //     }
    // )
    // console.log('更新的返回结果',updateResult);

    const removeResult = await  User.remove(({username:'list'}))
    console.log('删除返回结果',removeResult);
})()
```
2023-03-17 11:51:58