allow resenting of exam answers

generic/views.py

@@ -1042,6 +1042,29 @@ class ExamViews(View, LoginRequiredMixin):
 
         return render(request, "exam_users_edit.html", context)
 
+    def exam_reset_answers(self, request, exam_id):
+        if request.htmx:
+            exam = get_object_or_404(self.Exam, pk=exam_id)
+
+            if not request.user.groups.filter(name="cid_user_manager").exists():
+                # raise PermissionDenied
+                if request.user not in exam.author.all():
+                    raise PermissionDenied
+
+            ## Delete all answers
+            exam.cid_user_answers.all().delete()
+
+            # User statuses
+            exam.exam_user_status.all().delete()
+
+            # CidUserExams
+            exam.cid_users.all().delete()
+
+            return HttpResponse("<b>Answers reset</b>")
+
+        else:
+            raise Http404("Invalid request")
+
     def exam_cids_edit(self, request, exam_id):
         exam = get_object_or_404(self.Exam, pk=exam_id)
 
@@ -2166,9 +2189,8 @@ class ExamViews(View, LoginRequiredMixin):
             # so we need to check for those
             if self.app_name == "longs":
                 for question in questions:
-                    #if question not in by_question:
-                    #    continue
-
+                    # If either question or user do not exist we give a default
+                    # not answered == score of 3
                     if user not in by_question[question]:
                         #print("NOT in")
                         by_question[question][user] = ("Not answered", 3.0)