Symfony2 form validation based on two fields

Question

I am currently developing a Website in which user may buy gift cards. I am using a three step form using the CraueFormFlow bundle and everything is concerning the steps. I a

Answer 1

You have many solutions for this.

The easiest one is to add a Callback constraint to your model class.

Another way to do it would be to create your custom constraint and its associated validator. You have a cookbook explaining how to create a custom validation constrain. This is the best approach to do it.

As your constraint does not apply to a property but to a class, you must specify it overriding the the ->getTargets() method of your constraint class:

class MyConstraint extends Constraint
{
    // ...

    public function getTargets()
    {
        return Constraint::CLASS_CONSTRAINT;
    }
}

So the value passed as $value argument of the ->isValid() method will contain values of the whole class and not only of a single property.