Form Parser error and view for Symfony 2 Restful API

FormParser.php

<?php
/**
 * AppBundle\Services\FormParser.php
 */
 
namespace AppBundle\Services;

use Symfony\Component\Form\FormInterface;
use Symfony\Component\Form\FormView;

/**
 * @author Romain Marecat <romain.marecat@gmail.com>
 */
class FormParser
{
    /**
     * Pass form object and call it to get resulting array.
     *
     * @param   FormInterface  $form
     * @return  array
     */
    public function parseErrors(FormInterface $form)
    {
        $results = array();

        return $this->realParseErrors($form, $results);
    }

    /**
     * Pass form object and call it to get view resulting array
     * @param  FormInterface $form
     * @return array
     */
    public function parseView(FormInterface $form)
    {
        $results = array();

        return $this->realParseView($form, $results);
    }

    /**
     * This does the actual job. Method travels through all levels of form recursively and gathers errors.
     *
     * @param   FormInterface  $form
     * @param   array          &$results
     * @return  array
     */
    private function realParseView(FormInterface $form, array $results)
    {
        $view = $form->createView();
        if ($view instanceof FormView) {
            $config = $form->getConfig();
            $results[$view->vars['name']] = array_merge(
                self::getViewData($view->vars),
                array(
                    'submitted' => $form->isSubmitted(),
                    'valid' => $form->isValid(),
                    'method' => $config->getMethod(),
                    'action' => $config->getAction(),
                )
            );
        }
        self::parseChildrenView($view, $results);

        return $results;
    }

    /**
     * parseChildrenView
     * @param FormView $view
     * @param  array  &$results
     * @return array
     */
    protected static function parseChildrenView($view, array &$results)
    {
        if ($view->count() > 0) {
            $children = $view->children;
            foreach ($children as $child) {
                if ($child instanceof FormView) {
                    $results[$view->vars['name']][$child->vars['name']] = self::getViewData($child->vars);
                    self::parseChildrenView($child, $results[$view->vars['name']]);
                }
            }
        }
    }

    /**
     * getViewData
     * @param  array  $vars
     * @return array
     */
    private static function getViewData(array $vars)
    {
        return array(
            'required' => isset($vars['required']) ? $vars['required'] : null,
            'value' => isset($vars['value']) ? $vars['value'] : null,
        );
    }


    /**
     * This does the actual job. Method travels through all levels of form recursively and gathers errors.
     *
     * @param   FormInterface  $form
     * @param   array          &$results
     * @return  array
     */
    private function realParseErrors(FormInterface $form, array &$results)
    {
        foreach ($form->getErrors(true, true) as $key1 => $errors) {
            $key = $errors->getOrigin() ? $errors->getOrigin()->getName() : $key1;
            $results[$key][] = $errors->getMessage();
        }

        return $results;
    }
}

services.yml

  # AppBundle\Resources\config\services.yml
  services:
    services.form_parser:
      class: AppBundle\Services\FormParser