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How to Use the submit() Function to Handle Form Submissions

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use Symfony\Component\HttpFoundation\Request;
// ...

public function newAction(Request $request)
{
    $form = $this->createFormBuilder()
        // ...
        ->getForm();

    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid()) {
        // perform some action...

        return $this->redirectToRoute('task_success');
    }

    return $this->render('AppBundle:Default:new.html.twig', array(
        'form' => $form->createView(),
    ));
}

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use Symfony\Component\HttpFoundation\Request;
// ...

public function newAction(Request $request)
{
    $form = $this->createFormBuilder()
        // ...
        ->getForm();

    if ($request->isMethod('POST')) {
        $form->submit($request->request->get($form->getName()));

        if ($form->isSubmitted() && $form->isValid()) {
            // perform some action...

            return $this->redirectToRoute('task_success');
        }
    }

    return $this->render('AppBundle:Default:new.html.twig', array(
        'form' => $form->createView(),
    ));
}

$form->get('firstName')->submit('Fabien');