如何使用mongoose将我的socket.io连接到现有的mongodb连接

npm install mongoose socket.io

const mongoose = require('mongoose');
const socketio = require('socket.io');

mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('MongoDB connected');
  })
  .catch((err) => {
    console.error('MongoDB connection error:', err);
  });

const httpServer = require('http').createServer();
const io = socketio.listen(httpServer);

io.on('connection', (socket) => {
  console.log('A client connected');

  // 处理客户端发送的消息
  socket.on('message', (data) => {
    console.log('Received message:', data);

    // 将消息保存到MongoDB数据库
    const Message = mongoose.model('Message', { content: String });
    const message = new Message({ content: data });
    message.save()
      .then(() => {
        console.log('Message saved to MongoDB');
      })
      .catch((err) => {
        console.error('Error saving message to MongoDB:', err);
      });
  });

  // 处理客户端断开连接
  socket.on('disconnect', () => {
    console.log('A client disconnected');
  });
});