Yii file upload in admin?

Question

Yii

There is a site on which there is an admin panel, the admin panel provides for adding / editing products. The product has an attached file. All solutions, recipes describe a method in which the file is attached without problems, but when you edit the product, you have to re-upload the file all the time. How to make it so that when editing a product, the file should be loaded only when it needs to be changed?

Answer 1

Purely telepathically, probably like this
Remove the check for a required field from the rules
Where the value assigned to the model is added something like this

if(!empty($filePath)){
$model->image_url = $filePath
}