如何使用expressjs在mongoDB中只删除嵌套数组中的一个对象元素？

npm install express mongodb

const express = require('express');
const MongoClient = require('mongodb').MongoClient;
const ObjectId = require('mongodb').ObjectId;

const app = express();
const url = 'mongodb://localhost:27017'; // MongoDB连接URL
const dbName = 'your_database_name'; // 数据库名称

MongoClient.connect(url, { useUnifiedTopology: true }, (err, client) => {
  if (err) {
    console.error(err);
    return;
  }

  console.log('Connected to MongoDB');

  const db = client.db(dbName);

  // 在这里执行删除操作的代码
});

app.delete('/users/:id/nestedArray/:elementId', (req, res) => {
  const userId = req.params.id;
  const elementId = req.params.elementId;

  db.collection('users').updateOne(
    { _id: ObjectId(userId) },
    { $pull: { nestedArray: { _id: ObjectId(elementId) } } },
    (err, result) => {
      if (err) {
        console.error(err);
        res.status(500).send('Error deleting element');
        return;
      }

      res.send('Element deleted successfully');
    }
  );
});