.

atlas/models.py

@@ -396,6 +396,22 @@ class Case(models.Model, AuthorMixin, QuestionMixin):
 
     cimar_uuid = models.CharField(max_length=255, null=True, blank=True)
 
+    def get_ordered_series_details(self):
+        # If the series are already prefetched, use them directly
+        if hasattr(self, '_prefetched_objects_cache') and 'series' in self._prefetched_objects_cache:
+            # Get the through model and sort by sort_order
+            through_model = self.series.through
+            # Build a mapping from series pk to through instance
+            through_objs = list(through_model.objects.filter(case=self).select_related('series'))
+            through_objs.sort(key=lambda x: x.sort_order)
+            return through_objs
+        # Otherwise, query as before
+        return self.series.through.objects.filter(case=self).select_related('series').order_by('sort_order')
+
+    def get_ordered_series(self):
+        """Returns the series in the case in order of the SeriesDetail sort_order"""
+        return [sd.series for sd in self.get_ordered_series_details()]
+
     def get_app_name(self):
         return "atlas"