public function getFlattenErrors(FormInterface $form = null, $subForm = false)
    {
        $form    = $form ?: $this->form;
        $flatten = [];

        foreach ($form->getErrors() as $error) {
            if ($subForm) {
                $flatten[] = $error->getMessage();
            } else {
                $path = $error->getCause()->getPropertyPath();

                if (!array_key_exists($path, $flatten)) {
                    $flatten[$path] = [$error->getMessage()];
                    continue;
                }

                $flatten[$path][] = $error->getMessage();
            }
        }

        $subForm = true;
        foreach ($form->all() as $key => $child) {
            $childErrors = $this->getFlattenErrors($child, $subForm);

            if (!empty($childErrors)) {
                $flatten[$key] = $childErrors;
            }
        }

        return $flatten;
    }