Дмитрий Ким

interface StatusListable
{
    public function getStatusName(): string;
}

trait StatusReturner
{
    public static function getStatusDescriptions()
    {
        return [
            self::STATUS_NOT_PAID => 'Не оплачено',
            self::STATUS_PAID => 'Оплачено',
            self::STATUS_CANCEL => 'Отменена',
        ];
    }

    public function getStatusName($status): string
    {
        return ArrayHelper::getValue(self::getStatusDescriptions(), $status);
    }
}

Products
----------------
id title
1  Nike
2  Puma
3  Lux

Images
--------------
1 1.jpg
2 2.jpg
3 3.png

pivotProductsImages
----------------
1 1
1 2
2 1
2 3
3 2
3 1
3 3

abstract CrudController extends Controller {
  public $modelClass;
  public $searchModelClass;

  public function actionIndex(){
    $searchModel = new $this->searchModel;
    // ...
  }

  public function actionView($id){
    $model = $this->findModel($id);
    // ...
    return $this->render('view', ['model' => $model]);
  }
  public function actionCreate(){
    $model = new $this->modelClass;
    // ...
  }
  public function actionUpdate($id){
    $model = $this->findModel($id);
    // ...
  }
  public function actionDelete($id){
    $model = $this->findModel($id);
    // ...
  }
  private function findModel($id){
    $modelCLass = new $this->modelClass;
    $model = $modelClass::findOne($id);
    // ...
    return $model;
  }
}

class ProductController extends CrudController {
  public $modelClass = '\app\common\models\Product';
  public $searchModelClass = '\backend\modules\product\models\Product';
}

class ItemController extends CrudController {
  public $modelClass = '\app\common\models\Item';
  public $searchModelClass = '\backend\modules\product\models\Item';
}

abstract CrudController extends Controller {
  public $permissions = [
    'index' => null,
    'view' => null,
    'create' => null,
    'update' => null,
    'delete' => null,
  ];
  // ...
  public function actionView(){
    if (isset($this->permissions['view']) && !Yii::$app->user->can($this->permissions['view']){
      throw new ForbiddenException();
    }
  }
}

class ProductController extends CrudController {
  public $permissions = [
    'index' => 'indexProduct',
    'view' => 'viewProduct',
    //...
  ];
}

class ItemController extends CrudController {
  public function beforeAction() {
    $this->permissions = array_merge(parent::$permissions, [
      'view' => 'viewItem',
    ]);
    return parent::beforeAction();
  }
}

abstract CrudController extends Controller {
  public $scenarios = [
    'index' => Model::SCENARIO_DEFAULT,
    'view' => Model::SCENARIO_DEFAULT,
    'create' => Model::SCENARIO_DEFAULT,
    'update' => Model::SCENARIO_DEFAULT,
    'delete' => Model::SCENARIO_DEFAULT,
  ];

  public function actionView($id){
    $model = $this->findModel($id);
    $model->scenario = $this->scenario['view'];
  }
  // ...
}
class ProductController extends CrudController {
  public function beforeAction() {
    $this->scenarios['view'] = Product::SCENARIO_VIEW;
    return parent::beforeAction();
  }
}

<form method="post">
    <input name="name">
    <input name="question[0][name]">
    <input name="question[0][answer][]">
    <input name="question[0][answer][]">
    <input name="question[0][correct_answer]">
    <input name="question[1][name]">
    <input name="question[1][answer][]">
    <input name="question[1][answer][]">
    <input name="question[1][correct_answer]">
    <input type="submit" value="save">
</form>

var_dump($_POST);
array (size=2)
  'name' => string '' (length=0)
  'question' => 
    array (size=2)
      0 => 
        array (size=3)
          'name' => string '' (length=0)
          'answer' => 
            array (size=2)
              0 => string '' (length=0)
              1 => string '' (length=0)
          'correct_answer' => string '' (length=0)
      1 => 
        array (size=3)
          'name' => string '' (length=0)
          'answer' => 
            array (size=2)
              0 => string '' (length=0)
              1 => string '' (length=0)
          'correct_answer' => string '' (length=0)