var orderAssignmentsMap = _.map(orderAssignments, function (assignment) {
                    return ScheduleDAO.getOrderById(assignment.orderId, params.projection).then(function (order) {
                      assignment['customProperties'] = order.customProperties;
                      return assignment;
                    }).then(function (oa) {
                      if (!oa.id) {
                        return null;
                      }
                      return eventBuilder.createEvent(oa, privateId++);
                    });
                  });
                  return resolve($q.all(orderAssignmentsMap));