Yii2 Gridview joinwith example

Yii2-grid-view-joinwith

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

                    'id',
                    'service_name',
                    'flat_rate',
                    /* Join width example */
                    [
                            'attribute' => 'country_id',
                            'label'     => 'Country',
                            'value'     => 'country.char2',
                    ],
                    'position',
                    'active',

                    ['class'    => 'yii\grid\ActionColumn',
                     'template' => '<span class="nowrap">{update} {delete}</span>',
                    ],
            ],
    ]); ?>