使用GET返回基于嵌套字段的记录

const express = require('express');
const app = express();
const port = 3000;

// 假设这是从数据库获取的用户数据
const users = [
  {
    id: 1,
    name: 'Alice',
    address: {
      city: 'New York',
      zip: '10001'
    }
  },
  {
    id: 2,
    name: 'Bob',
    address: {
      city: 'Los Angeles',
      zip: '90001'
    }
  }
];

// GET请求处理函数
app.get('/users/:id', (req, res) => {
  const userId = parseInt(req.params.id);
  const user = users.find(u => u.id === userId);

  if (!user) {
    return res.status(404).json({ message: 'User not found' });
  }

  res.json(user);
});

app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}/`);
});

app.get('/users/city/:city', (req, res) => {
  const city = req.params.city;
  const filteredUsers = users.filter(u => u.address.city === city);

  if (filteredUsers.length === 0) {
    return res.status(404).json({ message: 'No users found for this city' });
  }

  res.json(filteredUsers);
});