Question

我在恩贾梅纳有双向关系:

<class name="Child" table="Children">
  <many-to-one name="Parent" column="ParentId" not-null="true" />
</class>

<class name="Parent">
  <set name="Children" lazy="true" table="Children" cascade="all">
    <key column="ParentId" not-null="true" />
    <one-to-many class="Child" />
  </set>
</class>

How do I save it without setting inverse="true" and setting Parent property on Child?
I do not want to do this because it does not make much sense from the POCO perspective.

Alternatively, is it possible to intercept Add called on NHibernate proxy collection (Children)?
In that case, I would just put the Parent setting logic here.

Answer 1

除非你愿意使外国钥匙失去效力,并接受随后更新的插入,否则,这种改观是解放国双向的。

我确实普遍实施你可以采用的这种模式,......它提供了概念的证明;它可能有用或不有用,这取决于你如何看待它,因为这种做法会打破POCO的做法,但......好是:

public interface IHaveParent<T>
{
    T Parent { get; set; }
}

public interface IHaveMany<T>
{
    ICollection<T> Children { get; }
}

public static class OneToManyHelper
{
    public static void AddChild<TParent, TChild>(this TParent parent,
                                                 TChild child)
    where TChild : IHaveParent<TParent>
    where TParent : IHaveMany<TChild>
    {
        parent.Children.Add(child);
        child.Parent = parent;
    }
}

如果有的话,你可以就任何家长制定<条码>。

拦截Add号电话的问题是,你总是需要使用特殊方法(这同样不是POCO)即时收。

友情链接