如何使用Node和express在MongoDB服务中创建树模式

npm init -y

npm install express mongoose

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

mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('Connected to MongoDB');
  })
  .catch((error) => {
    console.error('Error connecting to MongoDB:', error);
  });

const treeSchema = new mongoose.Schema({
  name: String,
  children: [treeSchema]
});

const Tree = mongoose.model('Tree', treeSchema);

app.post('/trees', (req, res) => {
  const tree = new Tree(req.body);
  tree.save()
    .then(() => {
      res.status(201).send('Tree created successfully');
    })
    .catch((error) => {
      res.status(400).send('Error creating tree');
    });
});

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