app\models\BeatmapDiscussion::vote PHP Method

    public function vote($params)
    {
        $vote = $this->beatmapDiscussionVotes()->where(['user_id' => $params['user_id']])->firstOrNew([]);
        $vote->fill($params);
        if ($vote->score === null) {
            $vote->delete();
            return true;
        } else {
            return $vote->save();
        }
    }