nHibernate，将两个属性映射到同一类

问题描述

我有一个Mailclass，我想在其中保存发件人和收件人作为对User类的引用；

I have a Mailclass, where I want to save both the sender and the recipient as a reference to the User class;

    public class dbMail : Entity
{
    public virtual int ThreadID { get; set; }
    public virtual dbUser From { get; set; }
    public virtual dbUser To { get; set; }
    public virtual DateTime MailDate { get; set; }
    public virtual string MailText { get; set; }
    public virtual bool IsRead { get; set; }
}

和映射:

<id name="ID">
  <generator class="identity" />
</id>
<property name="ThreadID" />

<many-to-one name="From" class="dbUser" column="From"/>
<many-to-one name="To" class="dbUser" column="To"/>
<property name="MailDate" />
<property name="MailText" type="StringClob">
  <column name="MailText" sql-type="text" />
</property>
<property name="IsRead" />

但是，当尝试更新数据库时，会发生此错误:

However, when trying to update the database, this error occurs:

Duplicate property mapping of dbUser found in Domain.Model.dbMail

推荐答案

我有相同的映射情况，并且可以正常工作.唯一的区别是:

I've your same mapping situation and it works. The only difference is:

<many-to-one cascade="all" ...

尝试此解决方案，但如果此方法不起作用，则必须显示更新代码和/或dbUser代码以及映射以供进一步研究.

Try this solution but if this doesn't works you have to show update code and/or dbUser code and mapping for further investigation.

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