Câu hỏi: SDN302 Server-Side development with NodeJS, Express, and MongoDB – Bộ ôn tập cuối kỳ số 2

const mongoose = require('mongoose');

const childSchema = new mongoose.Schema({ name: String });
const parentSchema = new mongoose.Schema({ child: { type: mongoose.Schema.Types.ObjectId, ref: 'Child' } });
const Child = mongoose.model('Child', childSchema);
const Parent = mongoose.model('Parent', parentSchema);
async function run() {
    const child = await Child.create({ name: 'Kid' });
    await Parent.create({ child: child._id });
    const parent = await Parent.findOne().populate('child');
    console.log(parent.child.name);
}
run();

const fs = require('fs');
fs.readFile('file.txt', 'utf8', (err, data) => {
    if (err) console.log('Error occurred');
    else console.log(data);
});
console.log('Reading file');

const fs = require('fs');
const util = require('util');
const readFile = util.promisify(fs.readFile);
async function main() {
  try {
    const data = await readFile('config.json', 'utf8');
    console.log('Success:', data);
  } catch (err) {
    console.log('Error:', err.message);
  }
  console.log('Done');
}
main();

const express = require('express');
const router = express.Router();
router.get('/', (req, res) => {
  res.send('respond with a resource');
});
module.exports = router;