如何用mongoose更新mongoDB中嵌入文档

const mongoose = require('mongoose');

const addressSchema = new mongoose.Schema({
  street: String,
  city: String,
  state: String,
  country: String
});

const userSchema = new mongoose.Schema({
  name: String,
  age: Number,
  address: addressSchema
});

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

User.findById(userId, (err, user) => {
  if (err) {
    console.error(err);
    return;
  }

  // 更新嵌入文档中的属性
  user.address.city = 'New City';

  // 保存更新后的用户对象
  user.save((err, updatedUser) => {
    if (err) {
      console.error(err);
      return;
    }

    console.log('嵌入文档更新成功！');
    console.log(updatedUser);
  });
});