验证Mongoose模式并显示自定义错误消息的最佳实践



我已经开始学习Node.js,有一件事让我有点困惑,那就是Schema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?

假设我们有一个简单的模式:

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);

我想用唯一的电子邮件注册用户,所以我已经将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,我会收到这样的回复:

    "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
    }

这一切都有点混乱,我想显示发送到客户端,就像这样:

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

如何做到这一点?

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)

处理mongose中唯一约束的错误消息最简单的方法是使用插件,如mongose漂亮的唯一验证。它使错误消息看起来像普通的验证错误消息。

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