c＃Fluent nHibernate主键是外键

Question

我的数据库布局如下所示：

Users
------------
|UserId    | <-PK
|FirstName |
|LastName  |
|MiddleName|
|Email     |
------------

Admins
------------
|UserId    | <-PK/FK to Users
------------

我只是希望能够在Admins表中输入唯一ID来指定该用户是否为Admin。

这是我的Fluent nHibernate代码：

public class Users
{
    public virtual string UserId { get; set; }
    public virtual string FirstName { get; set; }
    ....
}

public class UserMappings : ClassMap<Users>
{
    public UserMappings()
    {
        Id(x => x.UserId).Column("UserId").Not.Nullable();

        Map(x => x.FirstName).Column("FirstName").Not.Nullable();
        Map(x => x.MiddleName).Column("MiddleName").Nullable();
        ....
    }
}

public class Admins
{
    public virtual Users User { get; set; }
}

public class AdminMappings : ClassMap<Admins>
{
    public AdminMappings()
    {
        Id(x => x.User).GeneratedBy.Foreign("Users");

        HasOne(x => x.User).Constrained();
    }
}

不幸的是，当我跑步时，我收到此错误：

Could not determine type for: SMAC.Users, SMAC, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null, for columns: NHibernate.Mapping.Column(User)

我想要的是，如果我这样做：

var admin;
admin.user <= instance of user to get name, email, etc...

我将如何实现这一目标？

编辑：我添加了这个，虽然我不知道它是否理想，但它让它工作了：

public AdminMappings()
{
    Id(x => x.UserId).Column("UserId");
    HasOne(x => x.User).Constrained();
}

public UserMappings()
{
    Id(x => x.UserId).Column("UserId").Not.Nullable();
    Map(x => x.FirstName).Column("FirstName").Not.Nullable();
    Map(x => x.MiddleName).Column("MiddleName").Nullable();
    ...
    HasOne(x => x.Admin).Cascade.All();
}

public class Admins
{
    public virtual string UserId { get; set; }

    public virtual Users User { get; set; }
}

public class Users
{
    public virtual string UserId { get; set; }
    public virtual string FirstName { get; set; }
    ....
    public virtual Admins Admin { get; set; }
}

唯一需要注意的是，我必须实际设置UserId和User才能保存Admin记录，而不仅仅是UserId，并让它自动为我提取用户记录。

Answer 1

NHibernate可以在主键中处理FK

public class AdminMappings : ClassMap<Admins>
{
    public AdminMappings()
    {
        CompositeId().KeyReference(x => x.User, "UserId");
    }
}

不要忘记在Admin上适当地使用equals和gethashcode来使用User.Id