Mongoose填充以获取用户发布的所有帖子，返回空数组

const mongoose = require('mongoose');

// 用户模型
const userSchema = new mongoose.Schema({
  username: String,
  posts: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Post' }]
});

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

// 帖子模型
const postSchema = new mongoose.Schema({
  title: String,
  content: String
});

const Post = mongoose.model('Post', postSchema);

// 获取用户发布的所有帖子
const getAllPostsByUser = async (userId) => {
  try {
    const user = await User.findById(userId).populate('posts');
    if (!user) {
      return [];
    }
    return user.posts;
  } catch (error) {
    console.error(error);
    return [];
  }
};

// 使用示例
const userId = '用户的ID';
const posts = await getAllPostsByUser(userId);
console.log(posts);