流畅的NHibernate：如何创建一对多的双向映射？(Fluent NHibernate: How to create one-to-many bidirectional mapping?)

 基本问题 ：如何在Fluent NHibernate中创建双向一对多地图？ 
 
 细节： 
 
 我有一个父对象有很多孩子。 在我的情况下，孩子没有父母是没有意义的，所以在数据库中，我想要父对象的外键具有NOT NULL约束。 我从Fluent NHibernate映射自动生成我的数据库。 
 
 我有一个父母，许多孩子对象像这样： 
 
public class Summary
{
   public int id {get; protected set;}

   public IList<Detail> Details {get; protected set;}
}

public  class Detail
{
   public int id {get; protected set;}

   public string ItemName {get; set;}

  /* public Summary Owner {get; protected set;} */ //I think this might be needed for bidirectional mapping?
}
 
 这是我开始的映射： 
 
public class SummaryMap : ClassMap<Summary>
{
    public SummaryMap()
    {
        Id(x => x.ID);

        HasMany<Detail>(x => x.Details);
    }
}

public class DetailMap : ClassMap<Detail>
{
    public DetailMap()
    {
        Id(x => x.ID);

        Map(x => x.ItemName).CanNotBeNull();
    }
}
 
 在Detail表中，Summary_id应该不为空，因为在我的情况下，将Detail对象未附加到摘要对象是没有意义的。 但是，仅使用HasMany（）映射则将Summary_id外键留空。 
 
 我在NHibernate文档（ http://www.hibernate.org/hib_docs/nhibernate/html/collections.html ）中发现“如果父项是必需的，请使用双向一对多关联”。 
 
 那么如何在Fluent NHibernate中创建双向一对多地图？ 

Basic question: How to I create a bidirectional one-to-many map in Fluent NHibernate?
 
Details:
 
I have a parent object with many children. In my case, it is meaningless for the child to not have a parent, so in the database, I would like the foreign key to the parent to have NOT NULL constraint. I am auto-generating my database from the Fluent NHibernate mapping.
 
I have a parent with many child objects like so:
 
public class Summary
{
   public int id {get; protected set;}

   public IList<Detail> Details {get; protected set;}
}

public  class Detail
{
   public int id {get; protected set;}

   public string ItemName {get; set;}

  /* public Summary Owner {get; protected set;} */ //I think this might be needed for bidirectional mapping?
}
 
Here is the mapping I started with:
 
public class SummaryMap : ClassMap<Summary>
{
    public SummaryMap()
    {
        Id(x => x.ID);

        HasMany<Detail>(x => x.Details);
    }
}

public class DetailMap : ClassMap<Detail>
{
    public DetailMap()
    {
        Id(x => x.ID);

        Map(x => x.ItemName).CanNotBeNull();
    }
}
 
In the Detail table, the Summary_id should be Not Null, because in my case it is meaningless to have a Detail object not attached to the summary object. However, just using the HasMany() map leaves the Summary_id foreign key nullable.
 
I found in the NHibernate docs (http://www.hibernate.org/hib_docs/nhibernate/html/collections.html) that "If the parent is required, use a bidirectional one-to-many association".
 
So how do I create the bidirectional one-to-many map in Fluent NHibernate?

原文：https://stackoverflow.com/questions/310641