class HallDetail(DetailView):
    model = Hall
    form_class = OrderForm
    slug_field = 'hall_slug'
    slug_url_kwarg = 'hall_slug'
    template_name = 'hall.html'

    def get_context_data(self, **kwargs):
        context = super(HallDetail, self).get_context_data(**kwargs)
        context['tables'] = Table.objects.filter(hall=self.object.pk)
        context['form'] = OrderForm(initial={'table': self.object.tables.all(), 'hall': self.object.pk})
        print(context)

        return context