Refactor exam search widget: streamline filtering logic and enhance queryset efficiency

generic/views.py

@@ -6757,11 +6757,6 @@ def exam_search_widget(request):
                 qobj |= Q(**{lk: q})
             qs = model.objects.filter(qobj)
 
-    # Limit results
-    limit = 50 if q in ("*", "%") else 10
-    qs = qs.order_by("name")[:limit]
-
-
     # Apply optional filters from GET params to the per-model queryset
     # Only include filters that were supplied in GET _and_ where the model
     # actually exposes the field. This prevents models without a given
@@ -6777,26 +6772,31 @@ def exam_search_widget(request):
             continue
         extra_filters[pname] = val
 
+    # Apply filters at the queryset level for efficiency
+    if extra_filters:
+        try:
+            qs = qs.filter(**extra_filters)
+        except Exception:
+            # If a filter cannot be applied at DB level, fall back to leaving qs unchanged
+            pass
+
+    # Limit results (wildcard returns up to 50)
+    limit = 50 if q in ("*", "%") else 10
+    qs = qs.order_by("name")[:limit]
+
     results = []
-    logger.error(f"Exam search widget: model={model}, q='{q}', extra_filters={extra_filters}, initial_count={qs.count() if qs is not None else 'N/A'}")
+    logger.error(f"Exam search widget: model={model}, q='{q}', extra_filters={extra_filters}, post_filter_count={qs.count() if qs is not None else 'N/A'}")
     for e in qs:
-        # apply any extra_filters defensively (models may not have fields)
-        skip = False
-        for k, v in extra_filters.items():
-            if getattr(e, k, None) != v:
-                skip = True
-                break
-        if skip:
+        if not user_can_view_exam(e, request.user):
             continue
-        if user_can_view_exam(e, request.user):
-            results.append({
-                "id": e.pk,
-                "text": str(e),
-                "archive": getattr(e, "archive", False),
-                "open_access": getattr(e, "open_access", False),
-                "exam_mode": getattr(e, "exam_mode", False),
-                "candidates_only": getattr(e, "candidates_only", False),
-            })
+        results.append({
+            "id": e.pk,
+            "text": str(e),
+            "archive": getattr(e, "archive", False),
+            "open_access": getattr(e, "open_access", False),
+            "exam_mode": getattr(e, "exam_mode", False),
+            "candidates_only": getattr(e, "candidates_only", False),
+        })
 
     logger.error(f"Exam search widget: returning {len(results)} results after filtering")
 

generic/widgets.py

@@ -564,17 +564,6 @@ class ExamSearchSelectMultipleWidget:
                         return {{ cleaned: cleaned, filters: filters }};
                     }}
 
-                    function parseFilterTokens(q) {{
-                        const filters = {{}};
-                        if (!q) return {{ cleaned: '', filters: filters }};
-                        let cleaned = q.replace(tokenRe, function(m, name, val) {{
-                            filters[name] = /^(1|true|yes)$/i.test(val);
-                            return ' ';
-                        }});
-                        cleaned = cleaned.replace(/\s+/g,' ').trim();
-                        return {{ cleaned: cleaned, filters: filters }};
-                    }}
-
                     function fetchResults(rawQ) {{
                         const parsed = parseFilterTokens(rawQ || '');
                         const q = parsed.cleaned;