Edit file File name : LinkFieldName.php Content :<?php namespace Api\V8\Param\Options; use Symfony\Component\OptionsResolver\Options; use Symfony\Component\OptionsResolver\OptionsResolver; use Symfony\Component\Validator\Constraints as Assert; class LinkFieldName extends BaseOption { /** * Has a dependency of bean field. * * @inheritdoc * @throws \RuntimeException If relationship cannot loaded */ public function add(OptionsResolver $resolver) { $resolver ->setRequired('linkFieldName') ->setAllowedTypes('linkFieldName', ['string']) ->setAllowedValues('linkFieldName', $this->validatorFactory->createClosure([ new Assert\NotBlank(), new Assert\Regex([ 'pattern' => ModuleName::REGEX_MODULE_NAME_PATTERN, 'match' => false, ]), ])) ->setNormalizer('linkFieldName', function (Options $options, $value) { $bean = $options->offsetGet('sourceBean'); if (!$bean->load_relationship($value)) { throw new \RuntimeException( sprintf('Cannot load relationship %s for %s module', $value, $bean->getObjectName()) ); } return $value; }); } } Save