php - relational access in yii2 -

i want join 2 tables in yii 2 have relation each other. example have model named digital , model named tablet relation digital model foreign key sup_id.

so wanna access , show of these 2 tables entities in listview. when use join tag access model call in model::find() !!!! want of them :( shows

getting unknown property: app\models\digital::sim_num 

for example. defined relations in model

here action in sitecontroller

public function actionpagination_product2(){ $dataprovider = new activedataprovider([   'query' => digital::find()->select("digital.*")->leftjoin('tablet','tablet.sup_id= digital.id'),     'pagination' => [         'pagesize' => 20,     ], ]);      return $this->render('pagination_pro2', [       'dataprovider' => $dataprovider,    ]); } 

and in views/site/pagination_pro2 have

   use yii\widgets\listview;    echo listview::widget([       'dataprovider' => $dataprovider,       'itemview' => '_page1',    ]); 

and in views/site/_page1 have

<?php    use yii\helpers\html;    use yii\helpers\htmlpurifier; ?> <div class = "user">     <?= $model->sim_num?>  </div> 

where problem ?:((

it good, if define relation in digital model like

public function gettablet() {     return $this->hasone(tablet::class, ['id' => 'sup_id']); } 

you don't have join in query passed dataprovider if don't use in query. access in view file, use:

$model->tablet->sim_num;