NHibernate / FluentNHibernate只读复合id

我正在尝试映射2个实体。

JournalEntry.cs

class JournalEntry
{
    private readonly IList<JournalEntryItem> _items;
    public JournalEntry()
    {
        _items = new List<JournalEntryItem>();
    }
    public IList<JournalEntryItem> Items
    {
        get { return _items; }
    }
}

JournalEntryItem.cs

class JournalEntryItem
{
    private readonly JournalEntry _journalEntry;
    private readonly Account _account;
    public JournalEntryItem(JournalEntry journalEntry, Account account)
    {
        _journalEntry = journalEntry;
        _account = account;
    }
    public JournalEntry JournalEntry
    {
        get { return _journalEntry; }
    }
    public Account Account
    {
        get { return _account; }
    }
}

JournalEntryItemMap.cs

class JournalEntryItemMap : ClassMap<JournalEntryItem>
{
    public JournalEntryItem()
    {
        CompositeId()
            .KeyReference(x => x.JournalEntry).Access.Field()
            .KeyReference(x => x.Account).Access.Field();
        // Tried this too, obviously won't work anyway
        // CompositeId()
        //    .KeyReference(x => x.JournalEntry).ReadOnly()
        //    .KeyReference(x => x.Account).ReadOnly();
    }
}

这个映射抛出一个异常:

Could not find a setter for property 'JournalEntry' in class Macsauto.Domain.Accounting.Entities.JournalEntryItem'

我所知道的唯一的解决方法是创建一个受保护的属性。

是否有其他解决方法?

试过了，但还是不行:

JournalEntryItemMap.cs

class JournalEntryItemMap : ClassMap<JournalEntryItem>
{
    public JournalEntryItem()
    {
        CompositeId()
            .KeyReference(Reveal.Member<JournalEntryItem, JournalEntry>("_journalEntry")).Access.Field()
            .KeyReference(x => x.Account).Access.Field();
    }
}

我尝试了一个方法从FluentNHibernate的wiki页面，但即使产生相同的错误。

JournalEntryItem.cs

class JournalEntryItem
{
    // Removed the _ prefix just to make it even more similar with
    // those on FluentNHibernate wiki page
    private readonly JournalEntry journalEntry;
    public JournalEntryItem(JournalEntry journalEntry)
    {
        this.journalEntry = journalEntry;
    }
    public JournalEntry JournalEntry
    {
        get { return journalEntry; }
    }
}

JournalEntryItemMap.cs

class JournalEntryItemMap : ClassMap<JournalEntryItem>
{
    public JournalEntryItem()
    {
        CompositeId().KeyReference(x => x.JournalEntry).Access.CamelCaseField();
        // Other tried combinations, all throws same no setter error
        // CompositeId().KeyReference(x => x.JournalEntry).Access.ReadOnlyPropertyThroughCamelCaseField();
        // CompositeId().KeyReference(x => x.JournalEntry).Access.LowerCaseField();
    }
}

现在我很好奇了，这和版本问题有关吗?

我使用NHibernate 3.3.1.4000和FluentNHibernate 1.4.0.0.

FluentNHibernate跟上NHibernate吗?这几乎就像NHibernate忽略了我在FluentNHibernate中写的任何访问类型映射。