How to do validation in GridView?

Question

Yii

Such code in index
How to check if('username' == 'admin'){ 'template' => '{delete} }

<?= GridView::widget([
        'dataProvider' => $dataProvider,
        'columns' => [
            ['class' => 'yii\grid\SerialColumn'],

           // 'id',
            'username',
            //'auth_key',
            //'password_hash',
           // 'pas//sword_reset_token',
            // 'email:email',
            // 'status',
            // 'created_at',
            // 'updated_at',

            ['class' => 'yii\grid\ActionColumn', 'template' => '{delete}'],
        ],
    ]); ?>

Answer 1

Good afternoon.
To do this, you need to use roles (rbac)
Start with this article .

Answer 2

everything is in the docs:
www.yiiframework.com/doc-2.0/guide-output-data-wid...

[
        'class' => ActionColumn::className(),
        'visibleButtons' => [
        'delete' => (Yii::$app->user->identity->username == 'admin')?true:false,
        ], 
    ],