public function getUser(){
return $this->hasOne(User::className(), ['id' => 'id_user']);
}
public function getUserName(){
return ($this->user)?$this->user->name:'не задано';
}
[
'attribute' => 'id_user',
'value' => function($data){
return $data->userName;
},
],
<?= $form->field($model, 'id_type')->dropdownList($array,['prompt'=>'выбирай гад что-то'])?>