不同子类型的功能NHibernate实体的hasMany收藏 [英] Fluent NHibernate entity HasMany collections of different subclass types

问题描述

所以，一切与基本鉴别映射运作良好。我可以与实体A和B，没有任何问题直接交互

So everything is working well with the basic discriminator mapping. I can interact directly with entities A and B without any problems.

public class BaseType {}
public class EntityA : BaseType {}
public class EntityB : BaseType {}

这没有戏剧映射在BASETYPE映射为

This maps without drama in the BaseType mapping as

DiscriminateSubClassesOnColumn<string>("Type")
               .SubClass<BaseType>("A", m => { })
               .SubClass<BaseType>("B", m => { });

出现问题时：中，我们要映射集合到一个聚合每个子类

The problem occurs when: in an aggregate we want to map collections to each subclass

使用映射像下面

public class AggregateMap: BaseMap<Aggregate>
{
        public AggregateMap()
        {
                HasMany<EntityA>(x => x.ACollection).AsSet().Cascade.All();
                HasMany<EntityB>(x => x.BCollection).AsSet().Cascade.All();            
        }
}

这些明显的arent完全映射，但最低金额descibe我所尝试。加入ACollection和BCollection项目通过级联坚持正确总结时保存。然而，当总检索有该类型的歧视混淆。

These obviously arent full mappings but are the minimum amount to descibe what I am attempting. Items added to ACollection and BCollection are persisted correctly through the cascading when Aggregate is saved. However, when aggregate is retrieved there is confusion on the type discrimination.

我经历了这么多不同的解决方案我已经不知道什么是没有工作运行。我觉得我不应该提供藏品，但事情就不会为我工作where子句。

I have run through so many different possible solutions I no longer know what didn't work. I feel that I shouldn't have to provide a where clause on the collections but things just aren't working for me.

任何线索，将不胜感激。

Any clues would be appreciated.

推荐答案

您的映射看起来很奇怪，尤其是我觉得应该看的更多这样的

You mapping looks odd, in particular I think it should look more like this

DiscriminateSubClassesOnColumn<string>("Type")
               .SubClass<EntityA>("A", m => { })
               .SubClass<EntityB>("B", m => { });

说了这么多，似乎方法贬值，您应该定义以下（从<一所HREF =htt​​p://wiki.fluentnhibernate.org/Fluent_mapping#Subclasses相对=nofollow>自动映射子类：

public class ParentMap : ClassMap<Parent>
{
  public ParentMap()
  {
    Id(x => x.Id);
    Map(x => x.Name);

    DiscriminateSubClassesOnColumn("type");
  }
}

public class ChildMap : SubclassMap<Child>
{
  public ChildMap()
  {
    Map(x => x.AnotherProperty);
  }
} 

不知道这会虽然修复它，我还没有遇到您的方案。

Not sure this will fix it though, I am yet to encounter your scenario.

修改：这个问题也是引发的此处，听起来更像是对我的一个错误

Edit: The issue is also raised here, sounding more like a bug to me

这篇关于不同子类型的功能NHibernate实体的hasMany收藏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！