begin correct sorting of exams/collection

atlas/models.py

@@ -426,6 +426,7 @@ class Case(models.Model, AuthorMixin):
         return json.dumps(self.get_viva_details())
 
 
+
 def extract_image_dicom_json_from_ds(ds, url, image_index):
     to_keep = [
         "Columns",
@@ -866,6 +867,13 @@ class CaseCollection(ExamOrCollectionGenericBase):
         }
 
 
+    def order_cases(self): 
+        """Modifies the casedetail sort_order to sequentially order the cases"""
+        for n, c in enumerate(self.casedetail_set.all().order_by("sort_order")):
+            c.sort_order = n
+            c.save()
+
+
 class SeriesDetail(models.Model):
     case = models.ForeignKey(Case, on_delete=models.CASCADE)
     series = models.ForeignKey(Series, on_delete=models.CASCADE)