如何在mongoose nodejs和ejs中填充多个集合

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => console.log('Connected to MongoDB'))
  .catch(err => console.error('Could not connect to MongoDB', err));

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  name: String,
  email: String,
  // 其他字段...
});

const postSchema = new mongoose.Schema({
  title: String,
  content: String,
  // 其他字段...
});

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

const express = require('express');
const router = express.Router();

router.get('/posts', async (req, res) => {
  try {
    const posts = await Post.find().populate('author');
    res.render('posts', { posts });
  } catch (err) {
    console.error(err);
    res.status(500).send('Internal Server Error');
  }
});

module.exports = router;

<% posts.forEach(post => { %>
  <h2><%= post.title %></h2>
  <p><%= post.content %></p>
  <p>Author: <%= post.author.name %></p>
<% }) %>