'btn btn-success']) ?>

$dataProvider, 'filterModel' => $searchModel, 'columns' => [ ['class' => 'yii\grid\SerialColumn'], [ 'attribute' => 'field_id', 'filter' => DocumentField::find()->select(['title', 'id'])->indexBy('id')->column(), 'value' => 'field.title' ], [ 'attribute' => 'document_id', 'filter' => Document::find()->select(['title', 'id'])->indexBy('id')->column(), 'value' => 'document.title' ], 'attribute' => 'value', ['class' => 'yii\grid\ActionColumn'], ], ]); ?>