fix prospect filtering

biz/filters.py

@@ -81,15 +81,11 @@ class ProspectStatusFilter(admin.SimpleListFilter):
         if self.value() == Status.NONE:
             return queryset.filter(activities__isnull=True)
         elif self.value():
-            # Get prospects whose most recent activity has the selected status
-            return queryset.filter(
-                activities__status=self.value()
-            ).annotate(
-                latest_activity_date=Max('activities__creation_date')
-            ).filter(
-                activities__creation_date=F('latest_activity_date'),
-                activities__status=self.value()
-            ).distinct()
+            prospects_with_status = []
+            for prospect in queryset:
+                if prospect.current_status() == self.value():
+                    prospects_with_status.append(prospect.id)
+            return queryset.filter(id__in=prospects_with_status)
         else:
             return queryset