fix slider

models/base/TopSlider.php

@@ -30,6 +30,7 @@ class TopSlider extends \yii\db\ActiveRecord
     public function rules()
     {
         return [
+			[['post_id', 'published_from', 'published_to'], 'required'],
             [['post_id', 'is_active'], 'integer'],
             [['published_from', 'published_to'], 'safe'],
         ];