Refactor case detail retrieval into a separate function for improved readability and error handling

atlas/views.py

@@ -303,47 +303,54 @@ def case_displaysets_delete(request, pk):
     displayset.delete()
     return HttpResponse("<li class='list-group-item' >Display set deleted successfully.")
 
+
+def get_case_for_case_detail(pk: int) -> Case:
+    try:
+        case = (
+            Case.objects
+            .select_related()  # Add any FK fields if needed
+            .prefetch_related(
+                Prefetch(
+                    "seriesdetail_set",
+                    queryset=SeriesDetail.objects.select_related("series").order_by("sort_order").prefetch_related(
+                        Prefetch(
+                            "series",
+                            queryset=Series.objects.select_related("modality", "examination", "plane", "contrast")
+                                .prefetch_related(
+                                    Prefetch(
+                                        "findings",
+                                        queryset=SeriesFinding.objects.prefetch_related(
+                                            "findings", "conditions", "structures"
+                                        )
+                                    ),
+                                    Prefetch("images", queryset=SeriesImage.objects.filter(removed=False).order_by("position")),
+                                )
+                        ),
+                    ),
+                ),
+                Prefetch("subspecialty", queryset=Subspecialty.objects.all()),
+                Prefetch("condition", queryset=Condition.objects.all()),
+                Prefetch("presentation", queryset=Presentation.objects.all()),
+                Prefetch("pathological_process", queryset=PathologicalProcess.objects.all()),
+                Prefetch("caseresource_set", queryset=CaseResource.objects.all()),
+                Prefetch("casecollection_set", queryset=CaseCollection.objects.all()),
+                Prefetch("display_sets", queryset=CaseDisplaySet.objects.prefetch_related(
+                    Prefetch("findings", queryset=Finding.objects.all()),
+                    Prefetch("structures", queryset=Structure.objects.all()),
+                    Prefetch("conditions", queryset=Condition.objects.all()),
+                )),
+            )
+            .get(pk=pk)
+        )
+        case.ordered_series = [sd.series for sd in case.seriesdetail_set.all()]
+        return case
+    except Case.DoesNotExist:
+        raise Http404("Case not found.")
+
 @login_required
 @user_has_case_view_access
 def case_detail(request, pk):
-    # Prefetch all related objects needed for the template
+    case = get_case_for_case_detail(pk)
-    case = (
-        Case.objects
-        .select_related()  # Add any FK fields if needed
-        .prefetch_related(
-            Prefetch(
-                "seriesdetail_set",
-                queryset=SeriesDetail.objects.select_related("series").order_by("sort_order").prefetch_related(
-                    Prefetch(
-                        "series",
-                        queryset=Series.objects.select_related("modality", "examination", "plane", "contrast")
-                            .prefetch_related(
-                                Prefetch(
-                                    "findings",
-                                    queryset=SeriesFinding.objects.prefetch_related(
-                                        "findings", "conditions", "structures"
-                                    )
-                                ),
-                                Prefetch("images", queryset=SeriesImage.objects.filter(removed=False).order_by("position")),
-                            )
-                    ),
-                ),
-            ),
-            Prefetch("subspecialty", queryset=Subspecialty.objects.all()),
-            Prefetch("condition", queryset=Condition.objects.all()),
-            Prefetch("presentation", queryset=Presentation.objects.all()),
-            Prefetch("pathological_process", queryset=PathologicalProcess.objects.all()),
-            Prefetch("caseresource_set", queryset=CaseResource.objects.all()),
-            Prefetch("casecollection_set", queryset=CaseCollection.objects.all()),
-            Prefetch("display_sets", queryset=CaseDisplaySet.objects.prefetch_related(
-                Prefetch("findings", queryset=Finding.objects.all()),
-                Prefetch("structures", queryset=Structure.objects.all()),
-                Prefetch("conditions", queryset=Condition.objects.all()),
-            )),
-        )
-        .get(pk=pk)
-    )
-    case.ordered_series = [sd.series for sd in case.seriesdetail_set.all()]
     can_edit = case.check_user_can_edit(request.user)
 
     return render(
@@ -2853,6 +2860,8 @@ def collection_case_view(request, pk, case_number):
 
     case, case_count = collection.get_case_by_index(case_number, case_count=True)
 
+    case = get_case_for_case_detail(case.pk)
+
     casedetail = CaseDetail.objects.get(case=case, collection=collection)
 
     series_list = case.series.all().prefetch_related("images", "examination", "plane")