public async Task <IActionResult> Delete(int id)
        {
            var model = await _subscriptionMonthPromotionRepository.GetSingleAsync(x => x.Id == id, x => x.SubscriptionMonthPromotionBonuses);

            if (model == null)
            {
                return(NotFound());
            }
            var dates = await _subscriptionMonthPromotionBonusDateRepository.All
                        .Where(x => x.SubscriptionMonthPromotionBonus.SubscriptionMonthPromotionId == id).ToListAsync();

            _subscriptionMonthPromotionBonusDateRepository.DeleteRange(dates);
            _subscriptionMonthPromotionBonusRepository.DeleteRange(model.SubscriptionMonthPromotionBonuses);
            _subscriptionMonthPromotionRepository.Delete(model);
            if (!await UnitOfWork.SaveAsync())
            {
                return(StatusCode(500, "删除时出错"));
            }
            return(NoContent());
        }