'Get all the actions that correspond to this registration.'

@detail_route(methods=['GET'])
def updates(self, request, pk=None):

    reg = self.get_object()
    query = Q(actor_content_type=reg.content_type, actor_object_id=reg.object_id)
    query |= Q(target_content_type=reg.content_type, target_object_id=reg.object_id)
    query |= Q(action_object_content_type=reg.content_type, action_object_object_id=reg.object_id)
    actions = Action.objects.filter(query)
    serializer = RealtimeActionSerializer(actions, many=True)
    return Response(serializer.data)
