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<?php
namespace App\Behavior;
use App\Model\Article;
use App\Model\ArticleCategory;
use yii\base\Behavior;
use yii\base\Event;
class ArticleCategoryBehavior extends Behavior
{
public function events()
return [
ArticleCategory::EVENT_BEFORE_DELETE => 'beforeDelete',
];
}
public function beforeDelete(Event $event)
/** @var ArticleCategory $model */
$model = $event->sender;
$count = Article::find()
->where([
'category_id' => $model->id,
'is_deleted' => 0,
])
->count();
if ($count > 0) {
throw new \Exception('Unable to delete category since there are articles belong to it');
razonyang /
yii2-app-template
