Yii2 - DynamicModel validation - php

Question

I have a form and I want to change my DynamicModel rule validations depedending on the value chosen in a specific select input. I've read this doc but I don't understand why my code doesn't work. I've tried the following with no results:
MyController
private function createFormModel(){
$model = new DynamicModel([
'indicador',
'mes'
]);
$model->addRule(['indicador'], 'required',['message' => 'This field is required']);
$model->addRule(['mes'], 'string');
$model->addRule(
'mes',
function ($attribute, $params, $validator) use ($model) {
if ($model->indicador == 'semana') {
$model->addError('mes', 'This field is required');
}
}
);
return $model;
}
MyView
<?php $form = ActiveForm::begin(); ?>
<!-- indicador -->
<div class="form-group">
<?= $form->field($model, 'indicador')->widget(Select2::class, [
'options' => ['id'=>'indicador'],
'data' => [
'dia' => 'Actividad por Día',
'semana' => 'Actividad por Semana',
'resumen' => 'Resumen de actividad'
],
'pluginOptions' => [
'placeholder'=>'Seleccionar indicador',
'allowClear' => true
],
]); ?>
</div>
<!-- /.indicador -->
<!-- mes -->
<div id = "semana" class="form-group hidden">
<?= $form->field($model, 'mes')->widget(DepDrop::class, [
'type' => DepDrop::TYPE_SELECT2,
'options' => ['id' => 'mes'],
'select2Options' => ['pluginOptions' => ['allowClear' => true]],
'pluginOptions' => [
'depends' => ['indicador'],
'placeholder'=>'Seleccionar mes',
'url' => Url::to(['/campus/subindicador']),
'loadingText' => 'Cargando ...',
'initialize' => true,
]
]);?>
</div>
<!-- /.mes -->
<?= Html::submitButton('Aplicar filtros', ['class' => 'btn btn-block btn-default']) ?>
<?php ActiveForm::end(); ?>

Answer 1

You need to use when with required validator.
$model = new DynamicModel(['indicador', 'mes']);
$model->addRule(['indicador'], 'required', ['message' => 'This field is required']);
$model->addRule(['mes'], 'string');
$model->addRule(['mes'], 'required', ['when' => function ($dModel) {
return $dModel->indicador == 'semana';
}, 'message' => 'This field is required']);