Баг / При открытии урока школы 500 ошибка

apps/school/views.py

@@ -103,14 +103,14 @@ class LiveLessonsDetailView(DetailView):
                 raise Http404()
         if request.user.is_authenticated:
             if self.object.is_camp:
-                is_purchased = DrawingCampPayment.objects.all()
+                is_purchased = DrawingCampPayment.objects.paid()
             else:
-                is_purchased = SchoolPayment.objects.filter(weekdays__contains=[self.object.date.weekday() + 1],)
-            is_purchased = is_purchased.paid().filter(
+                is_purchased = SchoolPayment.objects.paid().filter(weekdays__contains=[self.object.date.weekday() + 1],)
+            is_purchased = is_purchased.filter(
                 user=request.user,
                 date_start__lte=now(),
                 date_end__gte=now() - timedelta(days=7),
-            ).exists() or is_purchased.paid().filter(
+            ).exists() or is_purchased.filter(
                 user=request.user,
                 date_start__lte=now(),
                 date_end__gte=now() - timedelta(days=30),