Use urllib.parse.urljoin instead of string concatenation for voting URL generation

from django.core.validators import RegexValidator

from django.conf import settings

from django.urls import reverse

from urllib.parse import urljoin

group_name_validator = RegexValidator(regex=r'^k\d{2}_[a-z]$', message="Nieprawidłowy format nazwy.")

    @property

    def voting_url(self):

        return f'{settings.SITE_URL}{reverse('vote:votings', args=[self.token])}' if self.token is not None else None

        return urljoin(settings.SITE_URL, reverse('vote:votings', args=[self.token])) if self.token is not None else None

    def has_voted(self, election):

        return self.participation_set.filter(election=election).exists()