Eccube\Form\DataTransformer\EntityToIdTransformer::reverseTransform PHP Method

    public function reverseTransform($id)
    {
        if (!$id) {
            return null;
        }
        $entity = $this->om->getRepository($this->className)->find($id);
        if (null === $entity) {
            throw new TransformationFailedException();
        }
        return $entity;
    }