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

When you don't have a data class attached to your form you can implement dependent constraints in forms like this:

    $startRangeCallback = function ($object, ExecutionContextInterface $context) use ($form)
    {
        $data = $form->getData();
        $rangeEnd = $data['range_end'];
        if($object && $rangeEnd){
            if ($object->getTimestamp() > $rangeEnd->getTimestamp()) {
                $context->addViolation('Start date should be before end date!', array(), null);
            }
        }

    };

    $form->add('range_start', 'bootstrap_datepicker', array(
            'format' => 'dd-MM-yyyy',
            'required' => false,
            'attr' => array('class' => "col-xs-2"),
            'calendar_weeks' => true,
            'clear_btn' => true,
            'constraints' => array(
                new Callback(array($startRangeCallback)),
            )
        )
    );

    $form->add('range_end', 'bootstrap_datepicker', array(
            'format' => 'dd-MM-yyyy',
            'required' => false,
            'attr' => array('class' => "col-xs-2"),
            'calendar_weeks' => true,
            'clear_btn' => true,

        )
    );