Add aggregated response summary and user answer filtering in exam review

generic/views.py

@@ -1216,6 +1216,53 @@ class ExamViews(View, LoginRequiredMixin):
             "can_edit": self.check_user_edit_access(request.user, exam_id=pk),
         }
 
+        # Compute aggregated response summary for this question within the current exam.
+        # Add counts and percentages to the context so fragments (e.g. SBAS) can display them.
+        try:
+            if hasattr(question, "cid_user_answers"):
+                ua_qs = question.cid_user_answers.filter(exam=exam)
+                total_responses = ua_qs.count()
+                counts = {}
+                for ans in ua_qs.values_list("answer", flat=True):
+                    counts[ans] = counts.get(ans, 0) + 1
+
+                # Compute percentages per answer key
+                pcts = {}
+                if total_responses:
+                    for k, v in counts.items():
+                        pcts[k] = round(100.0 * v / total_responses, 1)
+                else:
+                    for k in counts.keys():
+                        pcts[k] = 0.0
+
+                # If the question exposes a best_answer, compute correct count
+                correct_count = None
+                if hasattr(question, "best_answer") and question.best_answer:
+                    correct_count = ua_qs.filter(answer=question.best_answer).count()
+                else:
+                    correct_count = None
+
+                # percent correct
+                correct_pct = None
+                if correct_count is not None and total_responses:
+                    try:
+                        correct_pct = round(100.0 * correct_count / total_responses, 1)
+                    except Exception:
+                        correct_pct = None
+
+                context.update(
+                    {
+                        "exam_response_counts": counts,
+                        "exam_response_pcts": pcts,
+                        "exam_response_total": total_responses,
+                        "exam_response_correct_count": correct_count,
+                        "exam_response_correct_pct": correct_pct,
+                    }
+                )
+        except Exception:
+            # Best-effort: don't fail the review page if aggregation errors occur
+            pass
+
         # Choose an app-specific fragment if present, otherwise fall back to
         # the generic fragment. Expose the chosen fragment name in the
         # context so the full-page render can include it; return the fragment