Fluent nhibernate 未强制执行NHibernate唯一密钥

我有一个类，我想使用Fluent NHibernate定义一个唯一的键。我认为我这样做是正确的，但是我的单位tes，t，在其中我为讨论中的字段保存了两个具有相同值的对象，保存这两个项目时没有错误。以下是我得到的：

映射覆盖：

public class ItemOverride : IAutoMappingOverride<Item>
{
    #region IAutoMappingOverride<Item> Members

    public void Override(AutoMapping<Item> mapping)
    {
        mapping.Map(t => t.Prompt).UniqueKey("UIX_Item_Prompt").Not.Nullable();
    }

    #endregion
}

---

好的，如果我在一个事务中包装这两个保存，它会起作用。下面是新的单元测试：

    [Test]
    [ExpectedException(typeof(GenericADOException))]
    public void CannotSaveDuplicateItemPrompt()
    {
        ServiceLocatorInitializer.Init();
        IItemManagementService itemManagementService = new ItemManagementService(repository);

        NHibernateSession.Current.BeginTransaction();

        Item first = ItemInstanceFactory.CreateValidTransientItem();
        first.Prompt = "Duplicate";
        itemManagementService.SaveOrUpdate(first);
        Item second = ItemInstanceFactory.CreateValidTransientItem();
        second.Prompt = "Duplicate";

        ActionConfirmation confirm = itemManagementService.SaveOrUpdate(second);
        NHibernateSession.Current.Transaction.Commit();
    }

    [Test]
    [ExpectedException(typeof(GenericADOException))]
    public void CannotSaveDuplicateItemPrompt()
    {
        ServiceLocatorInitializer.Init();
        IItemManagementService itemManagementService = new ItemManagementService(repository);

        NHibernateSession.Current.BeginTransaction();

        Item first = ItemInstanceFactory.CreateValidTransientItem();
        first.Prompt = "Duplicate";
        itemManagementService.SaveOrUpdate(first);
        Item second = ItemInstanceFactory.CreateValidTransientItem();
        second.Prompt = "Duplicate";

        ActionConfirmation confirm = itemManagementService.SaveOrUpdate(second);
        NHibernateSession.Current.Transaction.Commit();
    }