public function taskFormSubmitted(Form $form)
    {
        $hash = $this->calculateHash($form->values->password) ;

        try {
            $this->registrations->registrationUser($form->values->username, $hash, $form->values->name);
            $this->flashMessage('byl jste registrovan', 'success');

        } catch (Exception $e) {
            if ($e->getCode() == 23000) {
                $this->flashMessage('tenhle nick uz je pouzivan.', 'danger');

            } else {
                $this->flashMessage('registrace se nepovedla, zkuste to prosím za chviličku znovu', 'danger');
            }
        };
    }