Moving replicated codes somewhere appropriate and access them from all controllers - symfony

Question

I want to be able to access a code from all my controllers so what is the best way of doing it? The code below is to handle form errors and I've been replicating it in every single controller in my project.
So I want to keep getErrorMessages() somewhere else and access it in controller below.
Note: I read about services but got confused and this example!
Example Controller:
class HelloController extends Controller
{
public function processAction(Request $request)
{
//More code here
if ($form->isValid() !== true)
{
$errors = $this->getErrorMessages($form);
return $this->render('SayHelloBundle:hello.html.twig',
array(
'page' => 'Say Hello',
'form' => $form->createView(),
'form_errors' => $errors
));
}
//More code here
}
private function getErrorMessages(FormInterface $form)
{
$errors = array();
foreach ($form->getErrors() as $error)
{
$errors[] = $error->getMessage();
}
foreach ($form->all() as $child)
{
if (! $child->isValid())
{
$options = $child->getConfig()->getOptions();
$field = $options['label'] ? $options['label'] : $child->getName();
$errors[$field] = implode('; ', $this->getErrorMessages($child));
}
}
return $errors;
}
}

Answer 1

You could create a class that has all the base operations in it and call that class (or set of classes) in your controllers.

Answer 2

OK did it :)
/var/www/html/local/sport/app/config/config.yml
imports:
- { resource: services.yml }
/var/www/html/local/sport/app/config/services.yml
parameters:
form_errors.class: Football\TeamBundle\Services\FormErrors
services:
form_errors:
class: %form_errors.class%
/var/www/html/local/sport/src/Football/TeamBundle/Services/FormErrors.php
namespace Football\TeamBundle\Services;
use Symfony\Component\Form\FormInterface;
class FormErrors
{
public function getErrors(FormInterface $form)
{
$errors = array();
//This part get global form errors (like csrf token error)
foreach ($form->getErrors() as $error)
{
$errors[] = $error->getMessage();
}
//This part get errors for form fields
foreach ($form->all() as $child)
{
if (! $child->isValid())
{
$options = $child->getConfig()->getOptions();
$field = $options['label'] ? $options['label'] : ucwords($child->getName());
//There can be more than one field error, that's why implode is here
$errors[strtolower($field)] = implode('; ', $this->getErrors($child));
}
}
return $errors;
}
}
controller
if ($form->isValid() !== true) {
$errors = $this->get('form_errors')->getErrors($form);
echo '<pre>'; print_r($errors); exit;
}