如何使用Sencha Touch数据模型读取嵌套的JSON结构？

{
  "id": 1,
  "name": "John",
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "state": "NY",
    "zip": "10001"
  }
}

Ext.define('Person', {
  extend: 'Ext.data.Model',
  fields: [
    { name: 'id', type: 'int' },
    { name: 'name', type: 'string' },
    { name: 'address', type: 'auto' }
  ],
  hasMany: {
    model: 'Address',
    name: 'addresses',
    associationKey: 'address'
  }
});

Ext.define('Address', {
  extend: 'Ext.data.Model',
  fields: [
    { name: 'street', type: 'string' },
    { name: 'city', type: 'string' },
    { name: 'state', type: 'string' },
    { name: 'zip', type: 'string' }
  ],
  belongsTo: 'Person'
});

var store = Ext.create('Ext.data.Store', {
  model: 'Person',
  proxy: {
    type: 'ajax',
    url: 'path/to/your/json/data.json',
    reader: {
      type: 'json',
      rootProperty: 'data'
    }
  },
  autoLoad: true
});

var person = store.getAt(0); // 获取第一个记录
var address = person.get('address'); // 获取嵌套的地址数据
console.log(address.street); // 输出街道地址
console.log(address.city); // 输出城市
console.log(address.state); // 输出州
console.log(address.zip); // 输出邮编