1 files changed, 20 insertions, 2 deletions
diff --git a/chimere/admin.py b/chimere/admin.py
index 521c5a2..60d1141 100644
--- a/chimere/admin.py
+++ b/chimere/admin.py
@@ -25,6 +25,7 @@ import datetime
 from django import forms
 from django.conf import settings
 from django.contrib import admin, messages
+from django.contrib.admin import SimpleListFilter
 from django.core.exceptions import ObjectDoesNotExist
 from django.db.models import Q
 from django.http import HttpResponse, HttpResponseRedirect
@@ -199,14 +200,31 @@ class AreaRouteListFilter(AreaMarkerListFilter):
             return queryset
         return queryset.filter(area.getIncludeRoute())
 
+class HasCategoriesListFilter(SimpleListFilter):
+    title = _('Has categories')
+    parameter_name = 'has_category'
+
+    def lookups(self, request, model_admin):
+        return (
+            ('true', _('Yes')),
+            ('false', _('No')),
+        )
+
+    def queryset(self, request, queryset):
+        if self.value() == 'false':
+            return queryset.filter(categories__isnull=True)
+        elif self.value() == 'true':
+            return queryset.exclude(categories__isnull=True)
+        return queryset
+
 class MarkerAdmin(admin.ModelAdmin):
     """
     Specialized the Point field.
     """
     search_fields = ("name",)
     list_display = ('name', 'status', 'start_date', 'end_date')
-    list_filter = ('status', AreaMarkerListFilter, 'categories', 'start_date',
-                   'end_date')
+    list_filter = ('status', AreaMarkerListFilter, 'categories',
+                   HasCategoriesListFilter, 'start_date', 'end_date')
     actions = [validate, disable, managed_modified, export_to_kml,
                export_to_shapefile, export_to_csv]
     exclude = ['submiter_session_key', 'import_key', 'import_version',