AbsenceController.php

    /**
     * Générer un PDF
     * @Security("is_granted(constant('\\App\\Security\\Voter\\PdfVoter::PDF_VIEW'), absence)")
     * @Route("/absence/preview_pdf/{id}", name="absence_pdf")
     *
     * @return void
     */
    public function createPDF(Absence $absence)
    {
        $this->absenceService->generatePdf($absence);
    }