[英]Why do I keep getting TypeError: User is not a constructor?
我正在練習創建模型和路線,並正在使用郵遞員發送POST請求以對其進行測試。 但是,我不斷得到的用戶不是構造函數錯誤。
index.js(路由)
const express = require('express')
require('./db/mongoose')
const User = ('./models/user')
const app = express()
const port = process.env.PORT || 3000
app.use(express.json())
app.post('/users', (req, res) => {
const user = new User(req.body)
user.save().then(() => {
res.send(user)
}).catch(() => {
})
})
app.listen(port, () => {
console.log(port + ' is aliiiiiiiive!')
})
用戶(模式)
const mongoose = require('mongoose')
const validator = require('validator')
const User = mongoose.model('User', {
name: {
type: String,
required: true,
trim: true
},
email: {
type: String,
require: true,
trim: true,
lowercase: true,
validate(value) {
if(!validator.isEmail(value)) {
throw new Error('Email is invalid')
}
}
},
age: {
type: Number,
default: 0,
validate(value) {
if(value < 0) {
throw new Error('Age must be a positive number.')
}
}
},
password: {
type: String,
trim: true,
lowercase: true,
required: true,
minlength: 7,
validate(value) {
if( value.toLowerCase().includes("password")) {
throw new Error("Password can't be 'password'.")
}
}
}
})
module.exports = User
mongoose.js
const mongoose = require('mongoose')
mongoose.connect('mongodb://127.0.0.1:27017/task-manager-api', {
useNewUrlParser: true,
useCreateIndex: true
})
我希望它能將我在Postman上發送的以下信息發送回一個對象:
{
"name": "Michael",
"email": "email@eail.com",
"password": "ThisIsAPassword"
}
您必須在編譯模型之前定義一個userSchema,如下所示:
const mongoose = require('mongoose')
const validator = require('validator')
const userSchema = new mongoose.Schema({
name: {
type: String,
required: true,
trim: true
},
email: {
type: String,
require: true,
trim: true,
lowercase: true,
validate(value) {
if(!validator.isEmail(value)) {
throw new Error('Email is invalid')
}
}
},
age: {
type: Number,
default: 0,
validate(value) {
if(value < 0) {
throw new Error('Age must be a positive number.')
}
}
},
password: {
type: String,
trim: true,
lowercase: true,
required: true,
minlength: 7,
validate(value) {
if( value.toLowerCase().includes("password")) {
throw new Error("Password can't be 'password'.")
}
}
}
})
const User = mongoose.model('User', userSchema);
exports.User = User
現在它是一個構造函數,因為我們說User
每個實例都是userSchema
的new
實例。
我想到了。 在index.js文件的第三部分,我省略了require。
代替這個:
const User = ('./models/user')
應該是這樣的:
const User = require('./models/user')
謝謝大家的幫助!
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