ordering fixed

api/event/views.py

@@ -4,6 +4,7 @@ from django.shortcuts import get_object_or_404
 from django.utils.functional import cached_property
 
 from rest_framework.viewsets import ModelViewSet
+from rest_framework.filters import OrderingFilter
 
 from event.models import Activity, ActivityTag, ActivityTemplate, Event, Place
 
@@ -75,7 +76,10 @@ class EventViewSet(ModelViewSet):
     queryset = Event.objects.all()
     serializer_class = EventSerializer
 
-    ordering = 'beginning_date'
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('title', 'creation_date', 'beginning_date',
+                       'ending_date', )
+    ordering = ('beginning_date', )
 
     def perform_create(self, serializer):
         serializer.save(created_by=self.request.user)
@@ -85,23 +89,33 @@ class PlaceViewSet(EventSpecificModelViewSet):
     queryset = Place.objects.all()
     serializer_class = PlaceSerializer
 
-    ordering = 'name'
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('name', )
+    ordering = ('name', )
 
 
 class ActivityTagViewSet(EventSpecificModelViewSet):
     queryset = ActivityTag.objects.all()
     serializer_class = ActivityTagSerializer
 
-    ordering = ('is_public', 'name')
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('is_public', 'name', )
+    ordering = ('is_public', 'name', )
 
 
 class ActivityTemplateViewSet(EventModelViewSet):
     queryset = ActivityTemplate.objects.all()
     serializer_class = ActivityTemplateSerializer
 
-    ordering = 'title'
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('title', )
+    ordering = ('title', )
 
 
 class ActivityViewSet(EventModelViewSet):
     queryset = Activity.objects.all()
     serializer_class = ActivitySerializer
+
+    filter_backends = (OrderingFilter,)
+    ordering_fields = ('title', )
+    ordering = ('title', )