node.js - 验证 Mongoose Schema 和显示自定义错误消息的最佳实践

Question

我已经开始学习 Node.js，但让我有点困惑的一件事是架构验证。

验证数据并向用户显示自定义错误消息的最佳做法是什么？

假设我们有这个简单的架构:

var mongoose = require("mongoose");

// create instance of Schema
var Schema = mongoose.Schema;

// create schema
var Schema  = {
    "email" : { type: String, unique: true },
    "password" : String,
    "created_at" : Date,
    "updated_at" : Date
};

// Create model if it doesn't exist.
module.exports = mongoose.model('User', Schema);

我希望注册用户具有唯一的电子邮件地址，因此我已将 unique: true 添加到我的架构中。现在，如果我想向用户显示错误消息，说明他为什么没有注册，我会收到类似这样的响应:

    "code": 11000,
    "index": 0,
    "errmsg": "E11000 duplicate key error index: my_db.users.$email_1 dup key: { : \"test@test.com\" }",
    "op": {
      "password": "xxx",
      "email": "test@test.com",
      "_id": "56895e48c978d4a10f35666a",
      "__v": 0
    }

这有点乱，我想像这样显示发送给客户端:

"status": {
  "text": "Email test@test.com is already taken.",
  "code": 400
}

如何实现？

Answer 1

const mongoose = require('mongoose')
const Schema = mongoose.Schema
const { hash } = require('../helpers/bcrypt')

const userSchema = new Schema({

email: {
    type: String,
    required: [true, 'email is required'],
    match: [/^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/, 'Invalid email format'],
    validate: {
        validator: function(v){
            return this.model('User').findOne({ email: v }).then(user => !user)
        },
        message: props => `${props.value} is already used by another user`
    },
},
password: {
    type: String,
    required: [true, 'password is required']
}

})

userSchema.pre('save', function(done){
    this.password = hash(this.password)
    done()
})


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