Auto create live lessons list

apps/school/views.py

@@ -2,7 +2,8 @@ from datetime import datetime, timedelta
 
 from django.contrib.auth import get_user_model
 from django.contrib.auth.decorators import login_required, user_passes_test
-from django.db.models import Min, F, Func
+from django.db.utils import IntegrityError
+from django.db.models import Min, F, Func, Q
 from django.http import Http404
 from django.shortcuts import get_object_or_404
 from django.utils.decorators import method_decorator
@@ -31,6 +32,26 @@ class LiveLessonsView(ListView):
     model = LiveLesson
     template_name = 'school/livelessons_list.html'
 
+    def get_queryset(self):
+        date_range = Q(
+            date__range=[
+                (now() - timedelta(days=7)).date(),
+                (now() + timedelta(days=10)).date(),
+            ]
+        )
+        queryset = LiveLesson.objects.filter(date_range)
+        if queryset.count() < 17:
+            start_date = now() - timedelta(days=7)
+            for i in range(18):
+                try:
+                    LiveLesson.objects.create(
+                        date=(start_date + timedelta(days=i)).date(),
+                    )
+                except IntegrityError:
+                    pass
+            queryset = LiveLesson.objects.filter(date_range)
+        return queryset
+
 
 @method_decorator(login_required, name='dispatch')
 class LiveLessonsDetailView(DetailView):