猫鼬必填字段嵌套架构

Question

我正在尝试使用mongoose 4.4.6在嵌套模式中创建必填字段，但从未收到验证错误。这是我的最少非工作代码：
models / Test.js：

var mongoose = require('mongoose');

var TestChildSchema = mongoose.Schema({
    _id: false,
    testRequiredField: {type: String, required: true} 
});

var TestParentSchema = mongoose.Schema({
    testField: TestChildSchema
});

module.exports = mongoose.model('Test', TestParentSchema);

我这样使用它：
page.js

var mongoose = require( 'mongoose' );
var Test = mongoose.model('Test');

exports.index = function (req, res) {
  var test = new Test();
  test.save(function (err, test) {
    var strOutput; 
     res.writeHead(200, { 
       'Content-Type': 'text/plain'
     }); 
     if (err) { 
       console.log(err); 
       strOutput = 'Oh dear, we\'ve got an error'; 
     } else { 
       console.log('test created: ' + test); 
       strOutput = 'Success'; 
     } 
     res.write(strOutput); 
     res.end(); 
  });

和我的app.js ：

var http = require('http');  
var mongoose = require('mongoose'); 
var dbURI = 'mongodb://localhost:27017/ConnectionTest'; 
mongoose.connect(dbURI); 
require('./models/Test');
var pages = require('./pages');

http.createServer(function (req, res) {  
  pages.index(req, res);
}).listen(8888, '127.0.0.1');

为什么此代码未在嵌套的必填字段上生成验证错误？ 还有另一种产生验证错误的方法吗？ 我想念什么吗？

Answer 1

因为在var test = new Test();之后，testRequiredField是未定义的var test = new Test();