代码拉取完成，页面将自动刷新
$article = Article::with(['user', 'user.group', 'user.tags'])->find(1);
结果：
{
id:1,
title: 'thinkphp',
user: {
id: 1,
name: 'thinkphp',
tags: {
{ name: 't1' },
{ name: 't2' }
}
},
}
期望：
{
id:1,
title: 'thinkphp',
user: {
id: 1,
name: 'thinkphp',
group: {
name: 'lv1'
},
tags: {
{ name: 't1' },
{ name: 't2' }
}
},
}
