DefaultController.php

<?php

namespace App\Controller;

use App\Form\Type\CompetitionApplicationType;
use Carbon\Carbon;
use Exception;
use Pimcore\Controller\FrontendController;
use Pimcore\Mail;
use Pimcore\Model\DataObject\CompetitionApplication;
use Pimcore\Model\DataObject\Service;
use Pimcore\Translation\Translator;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

class DefaultController extends FrontendController
{
    public function defaultAction(Request $request, Translator $translator): Response
    {
        $competitionApplication = new CompetitionApplication();

        $form = $this->createForm(CompetitionApplicationType::class, $competitionApplication);
        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $competitionApplication = $form->getData();

            try {
                $this->processCompetitionApplication($competitionApplication);
                $this->addFlash('success', $translator->trans('form.competition-application.success'));
            } catch (Exception $e) {
                $this->addFlash('error', $translator->trans('form.competition-application.error'));
            }
        }

        return $this->render('default/default.html.twig', [
            'form' => $form->createView()
        ]);
    }

    /**
     * @throws Exception
     */
    private function processCompetitionApplication(CompetitionApplication $competitionApplication): void
    {
        $now = Carbon::now();

        $competitionApplication->setDate($now);
        $competitionApplication->setKey($now->timestamp);
        $competitionApplication->setPublished(true);
        $competitionApplication->setParent(Service::createFolderByPath($now->format('/Y/m/d')));
        $competitionApplication->save();

        $mail = new Mail();
        $mail->to('competition@example.com');
        $mail->subject('New competition application');
        $mail->html("<p>Firstname: {{ firstname }}</p><p>Email: {{ email }}</p><p>Message: {{ message }}</p>");
        $mail->setParams([
           'firstname' => $competitionApplication->getFirstname(),
           'email' => $competitionApplication->getEmail(),
           'message' => $competitionApplication->getMessage(),
        ]);

        $mail->send();
    }
}