database - Filtering queryset with objects -

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currently have

foreach($this->friends $friend) {     $user_ids[] = $friend->id; }  $posts = post::wherein("user_id", $user_ids)->orderby("date_published", "desc")->paginate(15);

seems okay , works fine, creation of array little weird. there way filter user objects themselves? example

post::wherein("user", $this->friends)

where $this->friends 

public function friends() {     return $this->belongstomany("app\user", "friends_users", "user_id", "friend_id"); }

$this->friends collection object has lists method creates array column, or associative array 2 columns. here's how use it.

$posts = post::wherein("user_id", $this->friends->lists('id'))->orderby("date_published", "desc")->paginate(15);

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