What About Data transformers?

[Insolita]

In yii2 we have 'trim' and 'filter' validators... that really was not validators, but useful.

What about ability to add Transformers. Not sure - should it be in this repo, or as separated...

$transforms = new Transforms([
    'a'=>['trim', new TitleCaseTransformer()],
    'b'=>[function($v){ return rtrim($v, '/').'/';}, 'strtolower']
]);
$transforms->apply($dataSet);

or

$validator = new Validator([    
    'amount' => [
       (new Number())->integer()->max(100),
       (new Transform())->apply([function($value, DataSetInterface $data){
           return $data->getValue('mode') === 'X' ? $value*100: $value*$data->getValue('mul');
       }]),
        function ($value): Result {
            $result = new Result();
            if ($value === 13) {
                $result->addError('Value should not be 13!');
            }
            return $result;
        }
    ],
]);

[samdark]

See https://forum.yiiframework.com/t/saving-or-killing-non-validation-in-validators/126086

[samdark]

Validators are for validation. Transforming and normalizing should be done elsewhere and I think it really depends on the class that is being transformed. It could be implemented directly in constructor/setters or via special mechanism. Or even outside of the class directly where the class is being filled with data.