/**
* Prepare a validation group and inject in the provided form
*
* Takes an array of elements names
*
* @param string|array|Traversable $spec
* @param FormInterface $form
* @param string $method
* @return void
* @throws Exception\DomainException if validation group given is not an array
*/
protected function prepareAndInjectValidationGroup($spec, FormInterface $form, $method)
{
if (!is_array($spec)) {
if (!class_exists($spec)) {
throw new Exception\DomainException(sprintf('%s expects an array for validation group; received "%s"', $method, $spec));
}
}
$form->setValidationGroup($spec);
}
