code: public function run($id)
      {
          $model = $this->findModel($id);
          if ($this->checkAccess) {
              call_user_func($this->checkAccess, $this->id, $model);
          }
  
          return $model;
      }
docs: Displays a model.
  @param string $id the primary key of the model.
  @return \yii\db\ActiveRecordInterface the model being displayed