如何使用Mongoose取消引用Mongoengine创建的对象？

const mongoose = require('mongoose');
const mongoengine = require('mongoengine');

// 定义Mongoengine模型
const User = mongoengine.model('User', new mongoengine.Schema({
  name: String,
  age: Number
}));

// 连接MongoDB
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true });

// 创建Mongoose模型
const UserModel = mongoose.model('User', new mongoose.Schema({
  name: String,
  age: Number
}));

// 使用Mongoengine创建对象
const mongoengineUser = new User({ name: 'John', age: 25 });

// 转换为Mongoose对象
const mongooseUser = new UserModel({
  name: mongoengineUser.name,
  age: mongoengineUser.age
});

// 保存Mongoose对象到MongoDB
mongooseUser.save((err, savedUser) => {
  if (err) {
    console.error(err);
  } else {
    console.log('User saved:', savedUser);
  }
});