improve case user answer management (and fix small bug)

atlas/views.py

@@ -1682,7 +1682,12 @@ def collection_take_start(request, pk):
     """
     collection = get_object_or_404(CaseCollection, pk=pk)
 
-    valid_user = (collection.check_logged_in_user(request),)
+    valid_user = collection.check_logged_in_user(request)
+
+
+    # for now we only allow registered users....
+    if not valid_user:
+        raise PermissionDenied
 
     cid_exam = None
     if collection.collection_type == "REV" or valid_user:
@@ -2901,6 +2906,38 @@ def collection_question_schemas(request, exam_id: int):
         },
     )
 
+def collection_reset_answers_user_list(request, exam_id: int):
+    if request.htmx:
+        collection = get_object_or_404(CaseCollection, pk=exam_id)
+        cid_users = collection.cid_users.all()
+
+        if cid_users:
+            return render(request, "atlas/collection_reset_answers_user_list.html", {"collection": collection, "cid_users": cid_users})
+        else:
+            return HttpResponse("No user answers.")
+
+    else:
+        raise Http404("Invalid request")
+
+def collection_reset_answers_user(request, exam_id: int, user_id: int):
+    if request.htmx:
+        collection = get_object_or_404(CaseCollection, pk=exam_id)
+
+        # Select all case details (answers are linked to these)
+        case_details = collection.casedetail_set.all().prefetch_related()
+
+        # Delete all answers
+        for case in case_details:
+            user_answers = case.userreportanswer_set.filter(user_id=user_id)
+            user_answers.delete()
+
+        collection.cid_users.filter(user_user_id=user_id).delete()
+        collection.exam_user_status.filter(cid_user_exam__user_user_id=user_id).delete()
+
+        return HttpResponse("Success")
+
+    else:
+        raise Http404("Invalid request")
 
 def collection_reset_answers(request, exam_id: int):
     if request.htmx: