Yii2 required validation on update

Question

I\'ve Yii2 form containing form fields depending on action of page. Ex. Few fields appears when then action is create and few appears when action is updat

Answer 1

ActiveRecord does not set scenario automaticaly when you update or create items. You must override update() method in your model and set scenario that you need. E.g. in your case

public function update($runValidation = true, $attributeNames = null)
{
    $this->scenario = 'update';
    return parent::update($runValidation, $attributeNames);
}

Also you can set scenario in your actionUpdate

public function actionUpdate($id)
{
    $model = $this->findModel($id);
    $model->scenario = 'update';
    //load data from request, save model etc.
 }