使用node express框架访问mongoDB中的子文档ID

npm install express mongodb

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

const app = express();

app.get('/subdocument/:id', (req, res) => {
  const subdocumentId = req.params.id;

  // 连接到MongoDB数据库
  MongoClient.connect('mongodb://localhost:27017', (err, client) => {
    if (err) {
      console.error(err);
      res.status(500).send('Failed to connect to MongoDB');
      return;
    }

    const db = client.db('your-database-name');
    const collection = db.collection('your-collection-name');

    // 查询子文档ID
    collection.findOne({ 'subdocuments._id': subdocumentId }, (err, result) => {
      if (err) {
        console.error(err);
        res.status(500).send('Failed to query subdocument ID');
        return;
      }

      if (!result) {
        res.status(404).send('Subdocument ID not found');
        return;
      }

      const subdocument = result.subdocuments.find(subdoc => subdoc._id === subdocumentId);
      res.json(subdocument);
    });
  });
});

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});