fix(exam): blank total only for absent AND unmarked; flip status on mark

A roster student starts 'absent' and a direct mark would otherwise still show a
blank total. Now total is blank only when absent with no marks; recording a mark
advances the submission out of absent/unmatched to 'marking'.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

routers/exam/batches.py

@@ -187,8 +187,14 @@ def _assemble_results(ctx: ExamContext, batch: Dict[str, Any]) -> Dict[str, Any]
     results = []
     for s in submissions:  # every submission incl. absent → A7
         sub_marks = by_sub.get(s["id"], {})
-        is_absent = s.get("status") == "absent"
+        # Blank total ONLY for a genuine no-show (absent AND nothing marked). A student with any
-        total = None if is_absent else sum(v or 0 for v in sub_marks.values())
+        # mark gets a real total regardless of status; a present-but-unmarked student totals 0.
+        if sub_marks:
+            total = sum(v or 0 for v in sub_marks.values())
+        elif s.get("status") == "absent":
+            total = None
+        else:
+            total = 0
         results.append({
             "submission_id": s["id"],
             "student_id": s.get("student_id"),
@@ -248,7 +254,7 @@ async def upsert_mark(
     # Derive batch_id from the submission (as-user read → also enforces the caller owns the batch
     # the submission belongs to). The client never supplies the RLS scoping key directly.
     submission = _first(
-        ctx.supabase.table("student_submissions").select("id, batch_id").eq("id", body.submission_id).limit(1).execute()
+        ctx.supabase.table("student_submissions").select("id, batch_id, status").eq("id", body.submission_id).limit(1).execute()
     )
     if not submission:
         raise HTTPException(status_code=404, detail="Submission not found")
@@ -273,6 +279,12 @@ async def upsert_mark(
     upserted = _first(ctx.supabase.table("mark_entries").upsert(row).execute())
     if not upserted:
         raise HTTPException(status_code=500, detail="Failed to upsert mark")
+
+    # A marked student is, by definition, not absent — advance the submission out of the
+    # no-submission states so results/queue reflect that marking has started.
+    if submission.get("status") in ("absent", "unmatched"):
+        ctx.supabase.table("student_submissions").update({"status": "marking"}).eq("id", body.submission_id).execute()
+
     return upserted
 
 

tests/test_exam_batches.py

@@ -233,6 +233,17 @@ def test_upsert_mark_derives_batch_and_roundtrips():
     assert sum(1 for m in store["mark_entries"] if m["id"] == "mk-1") == 1
 
 
+def test_upsert_mark_flips_absent_submission_to_marking():
+    store = _batch_with_cohort()  # sub2 starts 'absent'
+    c = make_client(store)
+    c.put("/api/exam/marks/mk-2", json={"submission_id": "sub2", "question_id": "q1", "awarded_marks": 2})
+    sub2 = next(s for s in store["student_submissions"] if s["id"] == "sub2")
+    assert sub2["status"] == "marking"
+    # results now show a real total for the (formerly absent) marked student
+    res = {r["submission_id"]: r for r in c.get("/api/exam/batches/b1/results").json()["results"]}
+    assert res["sub2"]["total"] == 2
+
+
 def test_upsert_mark_submission_404():
     c = make_client(_batch_with_cohort())
     assert c.put("/api/exam/marks/mk-x", json={"submission_id": "nope", "question_id": "q1", "awarded_marks": 1}).status_code == 404