无法确定“ OfferManagementModel.FK_ManagerSwipeRestriction_Restriction”关系的主要结尾

Question

无法确定“ OfferManagementModel.FK_ManagerSwipeRestriction_Restriction”关系的主要结尾。添加的多个实体可能具有相同的主键。

下面的代码正在保存一个存储库项目，我在下面的方法中遇到了上面的错误：

public static bool Ensure(OfferModel originalModel, OfferModel editedModel, Fishbowl.Common.DataAccess.OfferManagement.Entities.Offer existingOffer)
        {
            var repository = new BundlesForOfferRepository();

            List<int> existingBundles = originalModel.ChosenBundleIds != null ? originalModel.ChosenBundleIds.ToList() : new List<int>();

            List<int> wantedBundles   =   editedModel.ChosenBundleIds != null ?   editedModel.ChosenBundleIds.ToList() : new List<int>();
            bool madeChanges = false;

            foreach (var oneExistingBundleId in existingBundles)
            {
                if (wantedBundles.Contains(oneExistingBundleId))
                {
                    // This bundle is wanted and already mapped --- no change necessary.
                }
                else
                {
                    // This bundle is not wanted but is already mapped --- drop it.
                    repository.Delete(originalModel.OfferId, oneExistingBundleId);
                    madeChanges = true;
                }
            }

            foreach (int oneWantedBundleId in wantedBundles)
            {
                if (existingBundles.Contains(oneWantedBundleId))
                {
                    // This bundle is wanted and already mapped --- no change necessary.
                }
                else
                {
                    // This bundle is wanted but not yet mapped --- insert it.
                    repository.Add(originalModel.OfferId, oneWantedBundleId);
                    madeChanges = true;
                }
            }

            if (madeChanges)
            {
                // Don't bother try/catch --- if there's an exception, let it be thrown
                repository.SaveAllObjectChanges();
            }

            return madeChanges;
        }
    }

The runtime error is coming while doing repository.SaveAllObjectChanges() but originally it is coming on the "else" part where we are adding repository and calling the 'repository.Add(originalModel.OfferId, oneWantedBundleId);' 

Below is the repository.add method:

 public void Add(int offerId, int bundleId)
        {
            var bundleForOffer = this.Get(0);
            bundleForOffer.OfferId  = offerId;
            bundleForOffer.BundleId = bundleId;
            base.Add(bundleForOffer);
        }

有人可以看看这个，并帮助我吗？如果您需要任何东西，请告诉我。