Where to add helper classes of model values?


I do not know what is the buzz word for the following problem.

For example:

I have a model class, which has a ‘gender’ property. This ‘gender’ property values are integer 1 and 2 (or 3).


 * This is the model class for table "{{example_model}}"

 * @property integer $gender


class ExampleModel extends ActiveRecord 



I have another class, it is called for instance: ‘ModelHelper’ which has a static function to map the ‘gender’ property value to labels in the View file.:


class ModelHelper


    public static getGenderList()


        return [1 => Yii::t('app', 'Male'), 2 => Yii:t('app', 'Female'), 3 => Yii:t('app', 'Other')];




This is used only in the View file for a ‘Dropdown list’:

    <?= $form->field($model, 'gender')->dropDownList(ModelHelper::getGenderList(), ['prompt' => Yii::t('app', 'SelectGender')]) ?>

What is your suggestions, where should I place this ModelHelper class?

I do not want to extend the original Model class, because in my view this is other kind of logic, which should be store in a seperated class.

I can place into the ‘components’, but there are behaviours, object, components classes too…

I’d name it Gender and put into \app\enums:

class Gender


    const MALE = 'male';

    const FEMALE = 'female';

    public static function list()


         return [

             null => 'Unknown',

             self::MALE => 'Male',

             self::FEMALE => 'Female',




$myGender = Gender::MALE;

This is a nice solution.

In PHP environment I totally forget the ENUMs.

I thought on the ‘component/extension/’ like in the ASP.NET. To extend the ‘Model/ActiveRecord’ class with these functions.