Better way

gistfile1.txt

When an accountNumber has been changed in the form it must be validated for uniqueness. This unique validator can't be used when the value hasn't been modified, because the value isn't unique then... I'm aware that I might write a custom validator, but my question is how do you handle dynamic input filtering on a form. A form for new record probably has different filters then while modifying.

I'm also aware of the validation groups, do those help in this situation?

    function editAction() {
        ...
        if ($this->getRequest()->isPost()) {
            $form->setData($this->getRequest()->getPost());

            if ($entity->getAccountNumber() != $form->get('dealer')->get('accountNumber')->getValue()) {
                /** @var $chain \Zend\Validator\ValidatorChain */
                $chain = $form->getInputFilter()->get('dealer')->get('accountNumber')->getValidatorChain();
                $chain->addValidator($form->get('dealer')->getUniqueAccountNumberValidator());
            }

            if ($form->isValid()) {
                ....


// different take, different example

         $form->get('user')->setIsPasswordRequiredContext(true); // but MUST be called before setData...
         $form->setData($this->getRequest()->getPost());