node.js - Mongoose 架构字段定义问题(关键字 : nodejs, req.body、extend、field、type)

Question

我花了半个小时才弄清楚问题所在，所以我需要发布这个问题以节省您的宝贵时间。

<小时/>

我有一个架构，其定义如下:

var mongoose = require('mongoose');
var ItemSchema = new mongoose.Schema({

    title: String,
    desc: String,
    price: Number,

    owner: { // this field would be filled with req.session.user
        uid: {type: Number, index: true},
        nickname: String,
        contact: String
    }
});

module.exports = mongoose.model('ItemSchema', ItemSchema);

<小时/>

然后，如果前端发送如下post请求:

console.log( req.body );
/*
    {
        title: 'apple',
        desc: 'nice apple',
        price: 100
    }
*/

<小时/>

我的 Express 路由器代码，写为:

...
req.body.owner = req.session.user;

var newItem = new ItemSchema( req.body );

newItem.save(function(err, re) {
    if (err) throw err;
    res.json(re);
});

<小时/>

之后，我的 ItemSchema 添加了一条记录(文档)。但它不包含用户字段，如下所示:

> db.item.findOne();
{
    _id: ObjectId('xxxxxxxxxxxxxxxxxxxxxxxx'),
    title: 'apple',
    desc: 'nice apple',
    price: 100
}

<小时/>

太奇怪了!!!用户字段在哪里？？？

<小时/>

我必须强调，如果 console.log( req.body )，它确实包含用户字段。

<小时/>

首先我创建了如下解决方案:

req.body.user = {
    uid: req.session.user.uid,
    nickname: req.session.user.nickname,
    contact: req.session.user.contact
}; // It works, but looks stupid

<小时/>

然后我使用下划线:

var newItem = new ItemSchema( _.extend(req.body, {user: req.session.user}) ); // It doesn't work, I don't know why

<小时/>

最后我发现肯定是Mongoose Schema Definition的问题，于是尝试了一下:

var ItemSchema = new mongoose.Schema({

    title: String,
    desc: String,
    price: Number,

    owner: {type: { // here is the key!!!
        uid: {type: Number, index: true},
        nickname: String,
        contact: String
    }}
});

<小时/>

从那时起，不再有问题，我可以编码:

req.body.user = req.session.user; // ok

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但是我发现我之前的定义应该没问题，如 http://mongoosejs.com/docs/guide.html介绍:

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

var blogSchema = new Schema({
  title:  String,
  author: String,
  body:   String,
  comments: [{ body: String, date: Date }],
  date: { type: Date, default: Date.now },
  hidden: Boolean,
  meta: { // here, same data structure with my user field
    votes: Number,
    favs:  Number
  }
});

<小时/>

那么问题出在哪里？

Answer 1

您可以设置 subdocument schema在 Mongoose 中

var UserSchema = new mongoose.Schema({

    uid: {type: Number, index: true},
    nickname: String,
    contact: String
}, {_id: false})

var ItemSchema = new mongoose.Schema({

    title: String,
    desc: String,
    price: Number,

    owner: UserSchema
});