使用对象过滤查询集

Question

目前我有

foreach($this->friends as $friend) {
    $user_ids[] = $friend->id;
}

$posts = Post::whereIn("user_id", $user_ids)->orderBy("date_published", "desc")->paginate(15);

看起来不错，工作正常，但数组的创建有点奇怪。有没有一种方法可以按用户对象本身进行过滤？例如

Post::whereIn("user", $this->friends)

其中 $this->friends 将是

public function friends() {
    return $this->belongsToMany("App\User", "friends_users", "user_id", "friend_id");
}

Answer 1

$this->friends 是一个 Collection 对象，它有一个 lists 方法，它从一列创建一个数组，或者从两列创建一个关联数组。下面是您将如何使用它。

$posts = Post::whereIn("user_id", $this->friends->lists('id'))->orderBy("date_published", "desc")->paginate(15);

使用对象过滤查询集

Filtering queryset with objects

database

relationship

laravel

eloquent

laravel-5