Question

我正在尝试实例化一个由子对象（user，authData和nameData）组成的对象emailData，现在我得到了它可以同步工作。作为练习，我也想尝试使用async来实现这一点，但是我不知道执行此操作的正确语法。有人可以帮助我让async通话正常吗？

这是我的模特，user.js：

const titleEnum = ['Dr.', 'Mr.', 'Ms.', 'Mrs.', 'None'];
const suffixEnum = ['Jr.', 'Sr.','II','III','IV','V', 'Esq'];
const recoveryEnum = ['Recovery', 'Normal'];
const commEnum = ['Comm','Backup'];

var AuthSchema = new Schema (
    {
        dateEffective: {type: Date},
        username: {type: String, required: true, max: 20, trim: true, lowercase: true},
        password: {type: String, required: true, max: 20}
    }
)

var NameSchema = new Schema (
    {
        title: {type: String, enum: titleEnum},
        firstName: {type: String, required: true, max: 25, trim: true, uppercase: true},
        middleName: {type: String, required: true, max: 25, trim: true, uppercase: true},
        familyName: {type: String, required: true, max: 25, trim: true, uppercase: true},
        suffix: {type: String, enum: suffixEnum}
        // suffix: {type: String, max: 8, trim: true, uppercase: true}
    }
)

var EmailSchema = new Schema (
    {
        emailAddress: {type: String, required: true, max: 25, trim: true, lowercase: true},
        recoveryType: {type: String, enum: recoveryEnum, default: "Normal"},
        commType: {type: String, enum: commEnum, default: 'Comm'}
    }
)

var UserSchema = new Schema(
    {
        authData: [AuthSchema],
        nameData: [NameSchema],
        emailData: [EmailSchema]
}
)

module.exports = {
    Auth: mongoose.model('Auth', AuthSchema),
    Name: mongoose.model('Name', NameSchema),
    Email: mongoose.model('Email', EmailSchema),
    User: mongoose.model('User', UserSchema)
}

下面是创建新用户的路由上的同步回调函数。该代码现在可以正常工作，但是作为学习练习，我想使用async.parallel来实现它：

var User = require('../models/user'),
    Auth = User.Auth,
    Name = User.Name,
    Email= User.Email,
    UserObj = User.User;

exports.user_create_get = function(req, res, next) {
    var authObj = new Auth({
        dateEffective: moment(Date.now(),"YYYY MM DD").format("YYYY MM DD"),
        username: '',
        password: ''
    });
    var nameObj = new Name({
        title: '',
        firstName: '',
        middleName: '',
        lastName: '',
        suffix: ''
    });
    var emailObj = new Email({
        emailAddress: '',
        recoveryType: '',
        commType: ''
    });

    var user = new UserObj({
        authData: [authObj],
        nameData: [nameObj],
        emailData: [emailObj]
    });
    res.json(user);
}

这是我尝试使用async.parallel实现以上代码的尝试。（在res.json调用之后，下面的代码不会填充/渲染/显示子对象中的任何字段，甚至不会为这些子对象生成任何_id字段。在那里是父对象的_id字段，但子对象只是空数组（长度为1，带有null条目）。

var User = require('../models/user'),
    Auth = User.Auth,
    Name = User.Name,
    Email= User.Email,
    UserObj = User.User;

exports.user_create_get = function(req, res, next) {
    async.parallel({
        auth: function(callback){
            var authObj = new Auth({
                dateEffective: moment(Date.now,"YYYY MM DD").format("YYYY MM DD"),
                username: '',
                password: ''
            })
            callback(this.auth);
        },
        name: function(callback){
            var nameObj = new Name({
                title: '',
                firstName: '',
                middleName: '',
                familyName: '',
                suffix: ''
            });
            callback(this.name);
        },
        email: function(callback){
            var emailObj = new Email({
                emailAddress: '',
                recoveryType: '',
                commType: ''
            })
            callback(this.email);
        }
    }, function(err, result){
        if (err) {return next(err);}
        var user = new UserObj({
            authData: [result.auth],
            nameData: [result.name],
            emailData: [result.email]
        })
        res.json(user);
    })
};

注意：我尝试使用callback(result.auth.authObj)，callback(result.authObj)之类的语法，但这些都不起作用：

如果在此情况下任何人都可以提供async的想法，请多谢！

Answer 1

我需要使用“ callback（null，authObj）”，“ callback”来代替“ callback（this.auth）”，“ callback（this.name）”，“ callback（this.email）”等。（null，nameObj）'，'callback（null，emailObj）'。

如何使用Async在Express中实例化带有子对象的对象？

1 个答案: