Behaviors Chap 5

bch-5

       /**
        * behaviors
        */

    public function behaviors()
    {
        return [
            'timestamp' => [
            'class' => 'yii\behaviors\TimestampBehavior',
            'attributes' => [
                                ActiveRecord::EVENT_BEFORE_INSERT => ['created_at', 'updated_at'],
                                ActiveRecord::EVENT_BEFORE_UPDATE => ['updated_at'],
                            ],
            'value' => new Expression('NOW()'),
                           ],
               ];
    }