I am trying to add filter to Gridview widget included in _form.php
The grid is showing fine, even filter field is shown,but the filter is not working.
Here is my code.
<?php
$searchModel = New CitySearch(); ?>
<?= GridView::widget([
'dataProvider' => $dataProvider,
'filterModel' => $searchModel,
'columns' => [
['class' => 'yii\grid\SerialColumn'],
// 'id',
'city_name',
['class' => 'yii\grid\ActionColumn'],
],
]); ?>