Yii - how to set up validation by condition?

Question

Yii

I am unable to set up conditional validation for related data via the yii-conditional-validator extension.
There are categories and there are jobs, if a category is selected when adding a job, in which the value of the field type = 1, then the field with the file is required, otherwise it is optional. Relationships 'works'=>array(self::HAS_MANY, 'Work', 'id_cat') and 'cat' => array (self::BELONGS_TO, 'Cat', 'id_cat'). How can this be done with or without extension - doesn't matter?

Answer 1

Without an extension, you can write your own rule, in which you can check incoming data and validate them in the right way.
Using custom filters in validation rules
Creating your own validation rule