yii2 filterModel

class FilterCol extends Model
{
private $data=array();
public function __get($name)
{
     if (array_key_exists($name, $this->data)) {
            return $this->data[$name];
        }

}
public function rules() {
   return [
    /* your other rules */
    [['nameGroup'],'default']
   ];
}
public function search($params) {
    print_r($params);
}
}


$searchModel=new FilterCol();

$searchModel->search(Yii::$app->request->queryParams);



or

'filterModel'=>true,
'columns' => [
            [
               'label' =>"г",
               'attribute' => 'nameGroup',
                'format'=>'raw',
                'filter' =>'<input class="form-control" name="filter[nameGroup]" value="'.Yii::$app->request->get('filter')['nameGroup'].'" type="text">'
                ,
            ],