Menu model

class MenuManager(models.QuerySet):
    """docstring for MenuManager"""

    def get_menu(self, attr):
        return self.filter(title=attr, parent_id__isnull=True).first()

    def get_submenu(self, user):
        submenu = self.filter(Q(seen_seeker=True))

    def get_supermenu(self, request):
        return self.filter(parent_id__isnull=True)

    def __getattr__(self, attr):
        attr, splitter, menu = attr.partition('get_menu_')
        if splitter:
            return self.get_menu(menu)
        return super().__getattr__(attr)




class Menu(Core):
    class Meta:
        ordering = ('parent_id', 'sort', 'title')
        verbose_name = _('Элемент меню')
        verbose_name_plural = _('Меню сайта')

    url = models.CharField(_('Линк'), max_length=256, blank=False, null=False, default='index')
    css_class = models.CharField(_('CSS-Класс блока меню'), max_length=30, null=False, blank=True, default='')
    seen_gasts = models.BooleanField(_('Элемент меню виден незарегистрированным пользователям'), default=True)
    seen_seeker = models.BooleanField(_('Элемент меню виден соискателям'), default=False)
    seen_employ = models.BooleanField(_('Элемент меню виден работодателям'), default=False)
    parent = models.ForeignKey('self', verbose_name=_('Суперкласс Меню'), null=True, blank=True,
                               related_name='submenus', on_delete=models.CASCADE)
    objects = MenuManager.as_manager()

    def __str__(self):
        self.title = self.title or self.css_class
        return super().__str__()

    def get_title(self):
        return super().__str__()

    def set_css_active(self):
        self.css_class = f'active {self.css_class}'
        return self

    def get_url(self):
        url = self.url
        return reverse(url) if ':' in url else url