public function canBeAnswered() {
        $countInThread = Comment::find()
            ->where(['thread' => $this->thread, 'user_id' => Yii::$app->user->id])
            ->count();
        return !Yii::$app->user->isGuest &&
            $this->last && // this is a last comment in a thread
            Yii::$app->user->identity->group == User::GROUP_COMMENTATOR && // you are a commentator
            $this->user_id != Yii::$app->user->id && // last comment not yours
            $countInThread > 0; // you begin this thread
            
    }