在Mongoose中引用另一个架构

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

// 定义用户Schema
const userSchema = new Schema({
  name: String,
  email: String
});

// 定义文章Schema，并引用用户Schema
const articleSchema = new Schema({
  title: String,
  content: String,
  author: { type: Schema.Types.ObjectId, ref: 'User' }
});

// 创建模型
const User = mongoose.model('User', userSchema);
const Article = mongoose.model('Article', articleSchema);

// 示例：创建用户和文章
async function run() {
  await mongoose.connect('mongodb://localhost:27017/test', { useNewUrlParser: true, useUnifiedTopology: true });

  const user = new User({ name: 'John Doe', email: 'john@example.com' });
  await user.save();

  const article = new Article({ title: 'My First Article', content: 'This is the content of my first article.', author: user._id });
  await article.save();

  // 查询文章及其作者
  const foundArticle = await Article.findOne().populate('author');
  console.log(foundArticle);

  await mongoose.disconnect();
}

run().catch(console.error);