有没有一个与mongoose populate()方法相反的方法？(Mongoose，node.js，express)

const mongoose = require('mongoose');
const express = require('express');
const app = express();

// 连接数据库
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('数据库连接成功');
  })
  .catch((error) => {
    console.error('数据库连接失败', error);
  });

// 定义模型
const UserSchema = new mongoose.Schema({
  name: String,
  age: Number,
  posts: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Post' }]
});

const PostSchema = new mongoose.Schema({
  title: String,
  content: String
});

const User = mongoose.model('User', UserSchema);
const Post = mongoose.model('Post', PostSchema);

// 查询用户并填充关联的文章
app.get('/users', (req, res) => {
  User.find().populate('posts').lean()
    .then((users) => {
      res.json(users);
    })
    .catch((error) => {
      console.error('查询用户失败', error);
      res.status(500).json({ error: '查询用户失败' });
    });
});

// 启动服务器
app.listen(3000, () => {
  console.log('服务器已启动');
});