Optimize exam collection queries by annotating exam counts and prefetching authors to improve template performance

generic/views.py

@@ -67,7 +67,7 @@ from generic.mixins import CheckCanEditMixin, SuperuserRequiredMixin
 
 import zipfile
 from django.core.files.base import ContentFile
-from django.db.models import Q
+from django.db.models import Q, Count, F
 
 from .forms import (
     CidGroupExamForm,
@@ -4777,6 +4777,30 @@ class SupervisorList(CidManagerRequiredMixin, SingleTableMixin, FilterView):
 
 class ExamCollectionList(ListView):
     model = ExamCollection
+    
+    def get_queryset(self):
+        """Annotate exam counts per collection and prefetch authors to avoid N+1 queries in templates."""
+        qs = (
+            ExamCollection.objects.all()
+            .annotate(
+                anatomy_count=Count("anatomy_exams", filter=Q(anatomy_exams__archive=False)),
+                longs_count=Count("longs_exams", filter=Q(longs_exams__archive=False)),
+                physics_count=Count("physics_exams", filter=Q(physics_exams__archive=False)),
+                rapids_count=Count("rapids_exams", filter=Q(rapids_exams__archive=False)),
+                sbas_count=Count("sbas_exams", filter=Q(sbas_exams__archive=False)),
+            )
+            .annotate(
+                total_count=F("anatomy_count")
+                +F("longs_count")
+                +F("physics_count")
+                +F("rapids_count")
+                +F("sbas_count")
+            )
+            .prefetch_related("author")
+            .order_by("name")
+        )
+
+        return qs
 
 
 class ExamCollectionDetail(DetailView, AuthorRequiredMixin):