流利的Nhibernate HasMany映射问题

Question

我是Fluent和NHibernate的新手，我不确定如何映射数据库中存在的这种特定关系。 我下面有下面的ER图，概述了我的表结构。

以下是我当前的C＃实体类：

public class GroupHeader
{
    public virtual Guid Id { get; private set;}
    public virtual string Name { get; set; }
    public virtual string Description { get; set; }
    public virtual IList<RightHeader> Rights { get; set; }
    public virtual IList<GroupRight> GroupRights { get; set; }
    public GroupHeader()
    {
        GroupRights = new List<GroupRight>();
        Rights = new List<RightHeader>();
    }
    public GroupHeader(string name, string description, IList<RightHeader> rights)
        : this()
    {
        Name = name;
        Description = description;
        Rights = rights;

        if (rights != null)
            foreach (RightHeader right in rights)
                AddRight(right, 1);
    }

    public virtual void AddRight(RightHeader newRight, decimal rightValue)
    {
        GroupRight newGroupRight = new GroupRight(this, newRight, rightValue);
        GroupRights.Add(newGroupRight);
    }
}

public class GroupRight
{
    public virtual GroupHeader Group { get; set; }
    public virtual RightHeader Right { get; set; }
    public virtual decimal RightValue { get; set; }

    public GroupRight()
    {

    }
    public GroupRight(GroupHeader group, RightHeader right, decimal rightValue)
    {
        Group = group;
        Right = right;
        RightValue = rightValue;
    }
}

public class RightHeader
{
    public virtual decimal Num { get; private set; }
    public virtual string Name { get; set; }
    public virtual string Description { get; set; }
    public virtual IList<GroupRight> GroupRights { get; set; }

    public RightHeader()
    {

    }
    public RightHeader(decimal num, string name, string description)
    {
        Num = num;
        Name = name;
        Description = description;
    }
}

这些是我流利的映射：

public class GroupHeaderMap : ClassMap<GroupHeader>
{
    public GroupHeaderMap()
    {
        Table("GROUP_HEADER");
        Id(x => x.Id, "GROUP_ID");
        Map(x => x.Name, "GROUP_NAME").Unique();
        Map(x => x.Description, "GROUP_DESCRIPTION");
        HasMany(x => x.GroupRights)
            .Table("GROUP_RIGHT_COMPOSITE")
            .KeyColumns.Add("GROUP_ID")
            .Cascade.AllDeleteOrphan();
    }
}

public class GroupRightMap : ClassMap<GroupRight>
{
    public GroupRightMap()
    {
        Table("GROUP_RIGHT_COMPOSITE");
        CompositeId()
            .KeyReference(x => x.Group, "GROUP_ID")
            .KeyReference(x => x.Right, "RIGHT_NUM");

        Map(x => x.RightValue, "RIGHT_VALUE").Not.Nullable();
    }
}

public class RightHeaderMap : ClassMap<RightHeader>
{
    public RightHeaderMap()
    {
        Table("RIGHT_HEADER");
        Id(x => x.Num, "RIGHT_NUM");
        Map(x => x.Name, "RIGHT_NAME");
        Map(x => x.Description, "RIGHT_DESCRIPTION");

        HasMany(x => x.GroupRights)
            .Inverse()
            .Table("GROUP_RIGHT_COMPOSITE")
            .KeyColumn("RIGHT_NUM");
    }
}

每当我运行尝试将新的GroupHeader，GroupRight和RightHeader添加到数据库的单元测试时，都会出现以下错误：

NHibernate.Exceptions.GenericADOException：无法插入：[Business.Objects.GroupRight＃Business.Objects.GroupRight] [SQL：插入GROUP_RIGHT_COMPOSITE（RIGHT_VALUE，GROUP_ID，RIGHT_NUM）值（？，？，？）]->系统.Data.SqlClient.SqlException：INSERT语句与FOREIGN KEY约束“ FK_GROUP_RIGHTS_RIGHTS”冲突。 数据库“ TEST”的表“ dbo.RIGHT_HEADER”的列“ RIGHT_NUM”中发生了冲突。 该语句已终止。

我很确定会发生这种情况，因为我正在创建的RIGHT_HEADER记录不在数据库中，并且违反了外键约束，但是我不确定如何映射它，以便NHibernate在尝试创建之前先插入RIGHT_HEADER GROUP_RIGHT_COMPOSITE记录。

编辑：我正在使用的单元测试如下：

    [TestMethod()]
    public void GroupHeaderAddTest()
    {
        RightHeader newRight = new RightHeader(1, "Some Right", "Allows user to do something");
        GroupHeader newGroup = new GroupHeader("Administrators", "Administrative group", null, null);
        newGroup.AddRight(newRight, 1);

        using (NHibernate.ISession session = SessionOrigin.Current.GetSession())
        {
            using (NHibernate.ITransaction tran = session.BeginTransaction())
            {
                session.SaveOrUpdate(newGroup);
                tran.Commit();
            }

            GroupHeader foundGroup = session.CreateCriteria<GroupHeader>()
                                .Add(Example.Create(newGroup))
                                .UniqueResult<GroupHeader>();

            Assert.IsNotNull(foundGroup, "Group should not be null");
            Assert.AreEqual<GroupHeader>(newGroup, foundGroup);
        }
    }

Answer 1

我可以使它起作用的唯一方法是将GroupRight的映射更改为以下内容：

public class GroupRightMap : ClassMap<GroupRight>
{
    public GroupRightMap()
    {

        Table("GROUP_RIGHT_COMPOSITE");
        CompositeId()
            .KeyReference(x => x.Group, "GROUP_ID")
            .KeyReference(x => x.Right, "RIGHT_NUM");

        References(x => x.Group, "GROUP_ID")
            .Not.Update()
            .Not.Insert()
            .Cascade.All();

        References(x => x.Right, "RIGHT_NUM")
            .Not.Update()
            .Not.Insert()
            .Cascade.All();

        Map(x => x.RightValue, "RIGHT_VALUE").Not.Nullable();
    }
}