Node.js 从Mongoose3.x升级到Mongoose4.x时，如何在模式中使用模式？

我有两个文件：

主要特点：

mongoose = require('mongoose');

Schema = mongoose.Schema;

DescriptionSchema = require('./description');

KeyFeatureSchema = new Schema({
  descriptions: [DescriptionSchema],
  title: String,
  key: String,
  display: String,
  feature: {
    type: Schema.Types.ObjectId,
    ref: 'Module'
  }
});

module.exports = KeyFeatureSchema;

说明：

mongoose = require('mongoose');

DescriptionSchema = new mongoose.Schema();

DescriptionSchema.add({
  display: String,
  subdescriptions: [String]
});

module.exports = DescriptionSchema;

---

我如何重写它以兼容Mongoose 4

。添加

语法？

我不确定是否理解您的问题，但下面是我得到的答案

根据语法，add语法仍然相同。因此，我用您的模式制作了一个简单的testing.js文件。我创建了一个keyFeature对象，其中一个对象位于描述数组中并保存了它。之后，我使用mongo控制台连接到mongod，并查询keyfeatures集合。对象已正确插入数据库

这是我的密码

var mongoose = require('mongoose');
var DescriptionSchema = require('./description.js');
var KeyFeatureSchema = require('./keyFeature.js');

mongoose.connect('mongodb://localhost/mongoose-testing', function(err)    {
    if(err){
        console.log('Could not connect to mongoose', err);
    }else{
        console.log('Successfully connected to mongoose');
        mongoose.model('Description', DescriptionSchema);
        mongoose.model('Keyfeature', KeyFeatureSchema);
        var Keyfeature = mongoose.model('Keyfeature');

        new Keyfeature({
            descriptions: [{
                display: 'This is the display content from descriptions',
                subdescriptions: ['Subdescription 1']
            }],
            title: 'tittle',
            key: 'key',
            display: 'display'
        }).save(function(err){
            if(err){
                console.log('Error when saving', err);
            }else{
                console.log('Saved');
            }
        });
    }
});

用mongoose@4.5.2