如何使用express js更新mongoose数组？

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

const userSchema = new mongoose.Schema({
  skills: [String]
});

const User = mongoose.model('User', userSchema);

app.put('/users/:id/skills', async (req, res) => {
  const userId = req.params.id;
  const newSkills = req.body.skills;

  try {
    const user = await User.findById(userId);
    user.skills = newSkills;
    await user.save();

    res.status(200).json(user);
  } catch (error) {
    res.status(500).json({ error: 'Failed to update skills' });
  }
});