Yii2 validator on change?

Question

Yii

But how can I make a validator to prevent data changes?

Answer 1

Purely theoretically possible.
Either in your validator, or, for example, in beforeSave, check the attribute for a change and if it has changed, add an error.

if($this->isAttributeChanged('attribute')) {
   $this->addError('attribute', "Текст сообщения об ошибке");
}

Answer 2

the validator validates, compares, and denies under certain conditions. If you just need to disable - then the validator is the last thing to use.
But if you wrote the question in detail, then there would be a chance of a specific answer with an example.