How to find out which article has the most comments?

Question

Yii

How can I find out which article has the most comments?

ArticleController : 
$discussedArticle = Articles::find()->with('comments')->groupBy('article_id')->orderBy('count(article_id) DESC')->asArray()->all();
Model : article
public function getComments()
    {
        return $this->hasMany(Comments::className(), ['article_id' => 'id']);
    }

Answer 1

Found :D
$discussedArticle = Articles::find()->joinWith('comments', true, 'RIGHT JOIN')->groupBy('comments.article_id')->orderBy('count(comments.article_id) DESC' )->limit(5)->all();

Answer 2

select MAX(id) from your_table