流畅的NHibernate - 错误脱水属性值;给定的密​​钥不在字典中

Question

我有一个名为ProjectTaskBudget的类，它具有IBudgetableIncomeStream类型的属性，如下所示：

public class ProjectTaskBudget
{
    public virtual IBudgetableIncomeStream BudgetableIncomeStream { get; set; }
}

IBudgetableIncomeStream是一个接口，除其他外，还应用于名为Deliverable的抽象类：

public abstract class Deliverable : IBudgetableIncomeStream
{
    // Some stuff
}

和一个名为RecurringIncomeLine的具体类：

public class RecurringIncomeLine : IBudgetableIncomeStream
{
    // Some stuff
}

从Deliverable继承的具体类是DeliverableItem和DeliverableTime。

ProjectTaskBudget的映射如下所示：

public class ProjectTaskBudgetMap : MappingBase<ProjectTaskBudget>
{
    public ProjectTaskBudgetMap()
    {
        ReferencesAny(n => n.BudgetableIncomeStream)
            .EntityTypeColumn("IncomeStreamType")
            .EntityIdentifierColumn("IncomeStream_id")
            .AddMetaValue<Deliverable>("Deliverable")
            .AddMetaValue<RecurringIncomeLine>("RecurringIncomeLine")
            .IdentityType<Guid>();
    }
}

这与RecurringIncomeLine一样，所以我怀疑问题与抽象/接口映射有关。 当我尝试使用ProjectTaskBudget向数据库添加新的Deliverable并刷新时，我收到此错误：

NHibernate.PropertyValueException: Error dehydrating property value for xxx.xxx.xxx.ProjectTaskBudget.BudgetableIncomeStream ---> System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
   at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
   at NHibernate.Type.MetaType.NullSafeSet(IDbCommand st, Object value, Int32 index, ISessionImplementor session)
   at NHibernate.Type.AnyType.NullSafeSet(IDbCommand st, Object value, Int32 index, Boolean[] settable, ISessionImplementor session)
   at NHibernate.Persister.Entity.AbstractEntityPersister.Dehydrate(Object id, Object[] fields, Object rowId, Boolean[] includeProperty, Boolean[][] includeColumns, Int32 table, IDbCommand statement, ISessionImplementor session, Int32 index)
   --- End of inner exception stack trace ---
   at NHibernate.Persister.Entity.AbstractEntityPersister.Dehydrate(Object id, Object[] fields, Object rowId, Boolean[] includeProperty, Boolean[][] includeColumns, Int32 table, IDbCommand statement, ISessionImplementor session, Int32 index)
   at NHibernate.Persister.Entity.AbstractEntityPersister.Insert(Object id, Object[] fields, Boolean[] notNull, Int32 j, SqlCommandInfo sql, Object obj, ISessionImplementor session)
   at NHibernate.Persister.Entity.AbstractEntityPersister.Insert(Object id, Object[] fields, Object obj, ISessionImplementor session)
   at NHibernate.Action.EntityInsertAction.Execute()
   at NHibernate.Engine.ActionQueue.Execute(IExecutable executable)
   at NHibernate.Engine.ActionQueue.ExecuteActions(IList list)
   at NHibernate.Engine.ActionQueue.ExecuteActions()
   at hiJump.Infrastructure.DataAccess.EventListeners.FixedDefaultFlushEventListener.PerformExecutions(IEventSource session) in c:\code\Git\Harmony\SharedCode\hiJump\hiJump.Infrastructure\DataAccess\EventListeners\FixedDefaultFlushEventListener.cs:line 35
   at NHibernate.Event.Default.DefaultFlushEventListener.OnFlush(FlushEvent event)
   at NHibernate.Impl.SessionImpl.Flush()

我想知道将界面直接应用于DeliverableItem和DeliverableTime是否有所作为，并且映射包含

.AddMetaValue<DeliverableItem>("DeliverableItem")
.AddMetaValue<DeliverableTime>("DeliverableTime")

但这是一个相当大的重构，所以我想先检查，看看我是否遗漏了更明显的东西，或者听起来像是废话。

Answer 1

好的，我明白了。问题在于映射，但不是我的想法。

它试图添加的IBudgetableIncomeStream实际上是 从DeliverableItem派生的东西，所以映射 DeliverableItem是不够的，我必须放入每个子类 映射中为DeliverableItem和DeliverableTime，例如：

.AddMetaValue<DeliverableItemSubclass1>("DeliverableItemSubclass1")
.AddMetaValue<DeliverableItemSubclass2>("DeliverableItemSubclass2")
.AddMetaValue<DeliverableTimeSubclass1>("DeliverableTimeSubclass1")