将Mongoose嵌套模式发布到MongoDB

const mongoose = require('mongoose');

// 定义嵌套模式
const addressSchema = new mongoose.Schema({
  street: String,
  city: String,
  state: String,
  country: String
});

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

// 将嵌套模式发布为模型
const UserModel = mongoose.model('User', userSchema);

// 创建一个新用户
const newUser = new UserModel({
  name: 'John Doe',
  email: 'john@example.com',
  address: {
    street: '123 Main St',
    city: 'New York',
    state: 'NY',
    country: 'USA'
  }
});

// 保存用户到数据库
newUser.save((err, savedUser) => {
  if (err) {
    console.error(err);
  } else {
    console.log('User saved:', savedUser);
  }
});