NodeJS/Mongoose -组合然后访问集合

const mongoose = require('mongoose');

// 连接到 MongoDB 数据库
mongoose.connect('mongodb://localhost/blog', { useNewUrlParser: true, useUnifiedTopology: true });

// 定义 User 模型
const userSchema = new mongoose.Schema({
  name: String,
  email: String
});

// 定义 Article 模型
const articleSchema = new mongoose.Schema({
  title: String,
  content: String,
  author: { type: mongoose.Schema.Types.ObjectId, ref: 'User' } // 关联 User 模型
});

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

// 创建一个用户和一个文章
async function createData() {
  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
async function getArticlesWithAuthors() {
  const articles = await Article.find().populate('author');
  console.log(articles);
}

createData().then(() => getArticlesWithAuthors());

const articleSchema = new mongoose.Schema({
  title: String,
  content: String,
  author: { type: mongoose.Schema.Types.ObjectId, ref: 'User' } // 确保引用名称正确
});