laravel preloading and lazy loading

Scenes

laravel中延迟加载就是很经典的n+1Query的例子,with实现的预加载实现了(1+1)query

analyze

1.  准备工具 barryvdh/laravel-debugbar
2.   Question Model And User Model  多对一的relationship
 .  可以很清晰的看到， 两者的区别的是 in($user_ids)  和loop  id=$user_id 的区别
 预加载的情况

    /**
     * 倒叙获得没有隐藏的question列表
     * @return mixed
     */
    public function getQuestionsFeed()
    {
       $page_size = env('PAGE_SIZE');
       return  Question::published()->orderBy('updated_at', 'desc')->with('user')->paginate($page_size);
    }

`在延迟加载的时候, `

    public function getQuestionsFeed()
    {
       $page_size = env('PAGE_SIZE');
       return  Question::published()->orderBy('updated_at', 'desc')->paginate($page_size);
    }