Form Errors Symfony

Form.php

private function getAllFormErrors($children, $template = true) {
        foreach ($children as $child) {
            if ($child->hasErrors()) {
                $vars = $child->createView()->getVars();
                $errors = $child->getErrors();
                foreach ($errors as $error) {
                    $this->allErrors[$vars["name"]][] = $this->convertFormErrorObjToString($error);
                    
                }
            }

            if ($child->hasChildren()) {
                $this->getAllErrors($child);
            }
        }
    }

    public function getAllErrors($children, $template = true) {
        $this->getAllFormErrors($children);
        return $this->allErrors;
    }

    private function convertFormErrorObjToString($error) {
        $errorMessageTemplate = $error->getMessageTemplate();
        foreach ($error->getMessageParameters() as $key => $value) {
            $errorMessageTemplate = str_replace($key, $value, $errorMessageTemplate);
        }
        return $errorMessageTemplate;
    }

The above Form.php file is
Symfony\Components\Form\Form.php

Hello are you aware of 'error_bubbling'?

e.g. (within your Form builder)
public function buildForm(FormBuilder $builder, array $options)
{
$builder
->add('title', 'text', array('error_bubbling' => true))
->add('body', 'textarea', array('error_bubbling' => true))

Then your form parent has access to the errors:
$form->getErrors();

Further info: http://stackoverflow.com/questions/6978723/symfony2-how-to-get-form-validation-errors-after-binding-the-request-to-the-fo

$errors = array();
foreach ($form->getChildren() as $child) {
    if ($child->hasErrors()) {
        foreach ($child->getErrors() as $error) {
            $errors[$child->getName()][] = $error->getMessageTemplate();
        }
    }
}

Get Translated Form Error Messages (Symfony2.3)

My version of solving the problem:
/src/Intranet/OrgunitBundle/Resources/config/services.yml

services:
    form_errors:
        class: Intranet\OrgunitBundle\Form\FormErrors

/src/Intranet/OrgunitBundle/Form/FormErrors.php

<?php
namespace Intranet\OrgunitBundle\Form;

class FormErrors
{
    public function getArray(\Symfony\Component\Form\Form $form)
    {
        return $this->getErrors($form);
    }

    private function getErrors($form)
    {
        $errors = array();

        if ($form instanceof \Symfony\Component\Form\Form) {

            // соберем ошибки элемента
            foreach ($form->getErrors() as $error) {

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

            // пробежимся под дочерним элементам
            foreach ($form->all() as $key => $child) {
                /** @var $child \Symfony\Component\Form\Form */
                if ($err = $this->getErrors($child)) {
                    $errors[$key] = $err;
                }
            }
        }

        return $errors;
    }
}

/src/Intranet/OrgunitBundle/Controller/DefaultController.php

$form = $this->createFormBuilder($entity)->getForm();
$form_errors = $this->get('form_errors')->getArray($form);
return new JsonResponse($form_errors);

Thanks @yapro It works!