Symfony2 data transformers, getting exception message

Question

I\'ve created my own data transformer, as explained in the dedicated cookbook, here is my reverse transformation:

public function reverseTransform($val)
{
    //         


        

Answer 1

Sort answer is: You don't. The transformers job is to, well, transform and not to do error checking.

Add a constraint to the field which will check the transformed value and take care of error messaging.