generic classes fixed

api/event/serializers.py

@@ -24,11 +24,12 @@ class EventSpecificSerializer(serializers.HyperlinkedModelSerializer):
     def create(self, validated_data):
         ModelClass = self.Meta.model
         event_pk = validated_data.pop('event_pk', None)
-        event = get_object_or_404(Event, id=event_pk)
+        event = event_pk and get_object_or_404(Event, id=event_pk) or None
         instance = ModelClass.objects.create(event=event, **validated_data)
         return instance
 
 
+# Serializers
 class EventSerializer(serializers.HyperlinkedModelSerializer):
     created_by = serializers.ReadOnlyField(source='created_by.username')
 

api/event/views.py

@@ -37,6 +37,7 @@ class EventSpecificViewSet(ModelViewSet):
         serializer.save(event_pk=event_pk)
 
 
+# ViewSets
 class EventViewSet(ModelViewSet):
     """
     This viewset automatically provides `list`, `create`, `retrieve`,