許多人加入Fluent NHibernate的自我問題

Question

我是一個完全的流利的新手，雖然我在網上找到了很多關於多對多聯接的信息，但在目前的情況下我還沒有發現太多。

注意：好的，這可能是垃圾設計，我最好制作單獨的桌子，對設計的侮辱是可以理解的:)

我有這樣的一張桌子：

和這樣的類：

[Serializable]
public class Transaction : Entity
{
    [DomainSignatureAttribute]
    public virtual long TransactionId { get; protected internal set; }
    public virtual long AccountId { get; set; }
    protected internal virtual short TransactionTypeId { get; set; }
    protected internal virtual short TransactionStatusId { get; set; }
    public virtual DateTime DateCreated { get; set; }
    public virtual DateTime DateEffective { get; set; }
    public virtual Decimal Amount { get; set; }

    public virtual IList<TransactionLink> ChildTransactions { get; set; }
    public virtual IList<TransactionLink> ParentTransactions { get; set; }

    public Transaction()
    {
        ChildTransactions = new List<TransactionLink>();
        ParentTransactions = new List<TransactionLink>();
    }

    /// <summary>
    /// Use this to add a payment to a charge to pay it off, or to add a refund on a payment to un-pay it
    /// </summary>
    /// <param name="inTransaction"></param>
    /// <param name="inAmount"></param>
    public virtual void AddChildTransaction(Transaction inTransaction, Decimal inAmount)
    {
        TransactionLink link = new TransactionLink()
                                            {
                                                TransactionParent = this,
                                                TransactionChild = inTransaction,
                                                Amount = inAmount
                                            };

        if (!ChildTransactions.Contains(link))
            ChildTransactions.Add(link);

        if (!inTransaction.ParentTransactions.Contains(link))
            inTransaction.ParentTransactions.Add(link);
    }

    /// <summary>
    /// You probably shouldnt be using this.
    /// </summary>
    /// <param name="inTransaction"></param>
    /// <param name="inAmount"></param>
    public virtual void AddParentTransaction(Transaction inTransaction, Decimal inAmount)
    {
        TransactionLink link = new TransactionLink()
                                            {
                                                TransactionChild = this,
                                                TransactionParent = inTransaction,
                                                Amount = inAmount
                                            };

        if (!inTransaction.ChildTransactions.Contains(link))
            inTransaction.ChildTransactions.Add(link);

        if (!ParentTransactions.Contains(link))
            ParentTransactions.Add(link);
    }
}

和

[Serializable]
public class TransactionLink : Entity
{
    public virtual Int64 TransactionIdParent { get; protected internal set; }
    public virtual Transaction TransactionParent { get; set; }

    public virtual Int64 TransactionIdChild { get; set; }
    public virtual Transaction TransactionChild { get; protected internal set; }

    public virtual DateTime LastModifiedOn { get; set; }
    public virtual Decimal Amount { get; set; }

    #region Override comparison - as this is a composite key we need to custom roll our comparison operators

    #endregion
}

地圖：

public TransactionMap()
    {
        Id(x => x.TransactionId);

        Map(x => x.AccountId);
        Map(x => x.TransactionTypeId);
        Map(x => x.TransactionStatusId);
        Map(x => x.DateCreated);
        Map(x => x.DateEffective);
        Map(x => x.Amount);
        HasMany(x => x.ParentTransactions).Cascade.None().KeyColumn("TransactionIdParent").LazyLoad();
        HasMany(x => x.ChildTransactions).Cascade.All().KeyColumn("TransactionIdChild").LazyLoad();
    }

和

public TransactionLinkMap()
    {
        CompositeId()
            .KeyProperty(x => x.TransactionIdParent, "TransactionIdParent")
            .KeyProperty(x => x.TransactionIdChild, "TransactionIdChild");

        References(x => x.TransactionParent).Column("TransactionIdParent").Cascade.SaveUpdate().LazyLoad();
        References(x => x.TransactionChild).Column("TransactionIdChild").Cascade.All().LazyLoad();

        Version(x => x.LastModifiedOn);
        Map(x => x.Amount);
    }

我正在進行調整，並從nHibernate中獲取各種錯誤-有人請告訴我解決此問題的最佳方法是什么？

Answer 1

Gah，發現了問題-在喬納斯（Jonas）指出其他設置之后，我認為問題必須出在復合鍵上-答案是？ 不要使用組合鍵！

即使設置了Version（）屬性，nHibernate仍然看到所有Transient對象都是相同的，因此當我試圖在一擊中添加3個Transaction時，情況還是很混亂。

如果有人遇到同樣的問題，此問題的解決方案是在多對多表中添加一個自動遞增鍵，並將其用作nHibernate中的鍵，這使nHibernate輕松區分瞬態對象！