protected virtual List <UserNotification> SaveUserNotifications(UserIdentifier[] users, NotificationInfo notificationInfo)
        {
            var userNotifications = new List <UserNotification>();

            var tenantGroups = users.GroupBy(user => user.TenantId);

            foreach (var tenantGroup in tenantGroups)
            {
                using (_unitOfWorkManager.Current.SetTenantId(tenantGroup.Key))
                {
                    var tenantNotificationInfo = new TenantNotificationInfo(_guidGenerator.Create(), tenantGroup.Key, notificationInfo);
                    _notificationStore.InsertTenantNotification(tenantNotificationInfo);
                    _unitOfWorkManager.Current.SaveChanges(); //To get tenantNotification.Id.

                    var tenantNotification = tenantNotificationInfo.ToTenantNotification();

                    foreach (var user in tenantGroup)
                    {
                        var userNotification = new UserNotificationInfo(_guidGenerator.Create())
                        {
                            TenantId             = tenantGroup.Key,
                            UserId               = user.UserId,
                            TenantNotificationId = tenantNotificationInfo.Id
                        };

                        _notificationStore.InsertUserNotification(userNotification);
                        userNotifications.Add(userNotification.ToUserNotification(tenantNotification));
                    }

                    CurrentUnitOfWork.SaveChanges(); //To get Ids of the notifications
                }
            }

            return(userNotifications);
        }