fixed some issues regarding assignments and single correction mode

- tutors no longer need an assignment when in exercise mode
- all feedback is always final when in single correction mode

core/serializers/feedback.py

@@ -122,6 +122,11 @@ class FeedbackSerializer(DynamicFieldsModelSerializer):
             if labels is not None:
                 comment_instance.labels.set(labels)
 
+        # Set all feedback final for when single correction is active
+        if config.SINGLE_CORRECTION:
+            feedback.is_final = True
+            validated_data['is_final'] = True
+
         return super().update(feedback, validated_data)
 
     def validate_of_submission(self, submission):

core/views/util.py

@@ -13,7 +13,9 @@ class NoAssignmentForTutor(Exception):
 def tutor_attempts_to_patch_first_feedback_final(feedback_serializer,
                                                  user,
                                                  assignment=None):
-    if user.role == models.UserAccount.REVIEWER:
+    # override assignment logic in exercise mode
+    if user.role == models.UserAccount.REVIEWER \
+            or user.role == models.UserAccount.TUTOR and config.EXERCISE_MODE:
         return False
     if user.role == models.UserAccount.TUTOR and assignment is None:
         raise NoAssignmentForTutor()