查询回调中的返回关键字 [英] Return keyword in query callback

问题描述

在laravel中使用whereHas时是否有必要编写return关键字.

Is it necessary to write return keyword while using whereHas in laravel.

例如返回$ query-> where('status'，1);

For eg. return $query->where('status', 1);

$posts = App\Post::whereHas('comments', function ($query) {
    $query->whereHas('content', function ($query){
       $query->where('status', 1);
    });
})->get();

我们是否需要在每个查询回调中编写return?

Do we need to write return in every query callback?

推荐答案

否，您正在通过调用$query->where('status', 1);修改传递给闭包的查询生成器实例.由于对象是通过引用传递的，并且where()会使该实例发生突变，因此无需返回任何内容.

No, you're modifying the query builder instance passed to your closure by calling $query->where('status', 1);. Since objects are passed by reference and where() mutates this instance, there's no need to return anything.

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