流利的nHibernate Join就是插入到连接的表中 [英] Fluent nHibernate Join is doing insert into joined table

问题描述

我试图使用连接从另一个表中获取一个属性，但没有映射。我的问题是，当我创建我的映射实体的新实例，并保存它时，我得到一个关于尝试插入到我的未映射表（它试图插入一个非空列的空值）的错误。我想使用.ReadOnly（）会停止nhibernate尝试插入到我的未映射表，但似乎并没有工作。

我的映射如下所示：

p>

  //加入_UnMapped表格与Mapped表格以获取属性
 Join（_ UnMapped，x => 
 
 $。
 x.KeyColumn（UnMappedFK）; 
 x.Map（y => y.Property，Property）
 .Not.Nullable（）
 .ReadOnly（）; 
}）; 
  

我曾经想过创建一个视图并映射到这个属性，但是如果我能宁愿通过映射来完成。任何帮助（或解释如何连接应该工作）将不胜感激！

解决方案使用 x.Inverse（）; 。

这里是一些关于连接的文档。

I am trying to use join to pull in a single property from another table, which doesn't have a mapping. My problem is that when I create a new instance of my mapped entity and save it I get an error about trying to insert into my unmapped table (it's trying to insert null into a not null column). I thought using .ReadOnly() would stop nhibernate from trying to insert into my unmapped table but that doesn't seem to work.

My mapping looks like this:

        // Join _UnMapped table with Mapped table to get the property
        Join("_UnMapped", x =>
            {
                x.Fetch.Join();
                x.KeyColumn("UnMappedFK");
                x.Map(y => y.Property, "Property")
                    .Not.Nullable()
                    .ReadOnly();
            });

I have thought about creating a view and mapping to that to get this property, but if I can I would rather do it through a mapping. Any help (or an explanation on how join is supposed to work) would be greatly appreciated!

解决方案

Use x.Inverse();.

Here is some documentation about join.

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