'btn btn-success']) ?>

$dataProvider, 'filterModel' => $searchModel, 'columns' => [ ['class' => 'yii\grid\SerialColumn'], [ 'attribute' => 'task_id', 'filter' => ArrayHelper::map(Task::find()->all(), 'id', 'title'), 'value' => 'task.title' ], [ 'attribute' => 'project_user_id', 'filter' => ArrayHelper::map(ProjectUser::find()->joinWith('user') ->all(), 'id', 'user.username'), 'value' => 'projectUser.user.username' ], ['class' => 'yii\grid\ActionColumn'], ], ]); ?>