====views====
class AdsList(ListView):
    model = Ads
    template_name = 'main/ad_list.html'
    context_object_name = 'ads'
    paginate_by = 5
    extra_context = {'all_tags': Tag.objects.all()}


class TagList(AdsList):
    def get_queryset(self):
        return Ads.objects.filter(tags__name=self.kwargs['name'])

====urls=====
path('ads/', views.AdsList.as_view(), name='ads'),
path('ads/<str:name>', views.TagList.as_view(), name='tag'),