node.js - Mongoose userModel 未定义

Question

我对 Nodejs 和 mongoDB 还很陌生。我已经创建了注册和用户架构，但它无法识别this并发送以下错误:

ReferenceError: userModel is not defined

当我跟踪错误时，我发现它无法识别this关键字。

这是user.js代码:

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var bcrypt = require('bcrypt');

var userSchema = new Schema({
    teamName: {
        type: String,
        unique: true,
        trim: true,
        required: true
    },
    faculty: {
        type: String,
        required: true
    },
    email: {
        required: true,
        unique: true,
        trim: true,
        type: String
    },
    password: {
        required: true,
        type: String
    },
    score: {
        type: Number,
        default: 0
    }
});

userSchema.pre('save', function(next) {
    var user = this;
    bcrypt.hash(user.password, 10, (err, hash) => {
        if (err) return next(err)
        user.password = hash;
        next();
    });
})

var userModel = mongoose.model('User', userSchema);
module.exports = userModel;

server.js

router.post('/register', (req, res) => {
    var newUser = {
        teamName: req.body.teamName,
        faculty: req.body.faculty,
        email: req.body.email,
        password: req.body.password
    }
    userModel.create(newUser, (err, user) => {
        if (err) {
            console.log('[Registratoin]: ' + err);
        } else {
            console.log(user)
            console.log('[Registration]: Done');
            // req.session.userID = user._id;
            res.redirect('/scoreboard')
        }
    });
});

Answer 1

模型中预保存 Hook 中的 this 关键字不是问题。

ReferenceError: userModel is not defined

ReferenceError: "x" is not defined意味着 userModel 在您调用它的范围内未定义。 (因此您引用了一个不存在的值)

I have include it like var userModel = require('the_path')

正如您所要求的并正确导出userModel。我会仔细检查您导入模块的路径。