Почему не работает relation в yii2?

Question

[Максим]

Tags.php

public function getArt() {
	$this->hasMany(Art::className(), ['id' => 'art_id'])
		->viaTable('art_tag', ['tag_id' => 'id']);
}

controller

$tag = Tags::find()->joinWith('art')->where(['id' => $tag])->all();

В итоге ошибка

backend\models\Tags has no relation named "art".

Answer 1

[Андрей]

return

public function getArt() {
  return $this->hasMany(Art::className(), ['id' => 'art_id'])
    ->viaTable('art_tag', ['tag_id' => 'id']);
}

Answer 2

[Mishko_kun]

public function getArt() {
 return $this->hasMany(Art::className(), ['id' => 'art_id'])
    ->viaTable('art_tag', ['tag_id' => 'id']);
}