mongoose架构默认属性未更新

const mongoose = require('mongoose');

// 定义Schema
const userSchema = new mongoose.Schema({
  name: {
    type: String,
    required: true
  },
  age: {
    type: Number,
    default: 18
  },
  email: {
    type: String,
    default: 'example@example.com'
  }
});

// 创建Model
const User = mongoose.model('User', userSchema);

// 创建文档
const user = new User({
  name: 'John'
});

// 保存文档
user.save()
  .then(() => {
    console.log('User saved successfully');
  })
  .catch((error) => {
    console.error(error);
  });