级联=“全部”不保存子实体

Question

我认为下面的对象模型表示 Party 和 PartyName 具有多对一的关系。我认为，Cascade=all i Party.hbm 应该让 NHib 保存子 PartyName。

但显然不是......

有人可以解释为什么 PartyName 没有与 Party 一起保存以及如何修复吗？

干杯，
Berryl

映射

<class name="Party" table="Parties">
<id name="Id">
  <column name="PartyId" />
  <generator class="hilo" />
</id>

<discriminator column="Type" not-null="true" type="string" />

<set access="field.camelcase-underscore" cascade="all" inverse="true" name="Names">
  <key foreign-key="Party_PartyName_FK">
    <column name="PartyNameId" />
  </key>
  <one-to-many class="Parties.Domain.Names.PartyName, Parties.Domain" />
</set>

<subclass 
  name="Smack.Core.TestingSupport.NHibernate.TestableDomain.SomeDopeyDomainModel.Student, Smack.Core.TestingSupport" 
  discriminator-value="Student"
  >
  <property name="Number" />

  <many-to-one 
    class="Smack.Core.TestingSupport.NHibernate.TestableDomain.SomeDopeyDomainModel.Course, Smack.Core.TestingSupport" 
    foreign-key="Course_FK" 
    name="Course">
    <column name="CourseId" index="CourseIndex" />
  </many-to-one>
</subclass>

<many-to-one access="field.camelcase-underscore" class="Parties.Domain.Party" foreign-key="Party_FK" name="Party">
  <column name="PartyId" index="PartyIndex" not-null="true"/>
</many-to-one>
<property name="TheRequiredName" not-null="true" length="50"/>
<property name="EverythingElse" />
<property name="ContextUsed" length="50"/>
<property name="Salutation" length="20"/>
<property name="EffectivePeriod" type="Smack.Core.Data.NHibernate.UserTypes.DateRangeUserType, Smack.Core.Data">
  <column name="EffectiveStart"/>
  <column name="EffectiveEnd"/>
</property>

失败测试（和输出）

    [Test]
    public void CanSaveAndLoad_AllProperties()
    {
        var partyName = NameSeeds.DevName;
        partyName.Party = _party;
        Assert.That(_party.Names.First(), Is.EqualTo(partyName));


        using (var tx = _session.BeginTransaction())
        {
            _session.Save(_party);
            tx.Commit();
        }
        _session.Clear();

        Party foundParty;
        using (var tx = _session.BeginTransaction())
        {
            foundParty = _session.Get<Party>(_party.Id); *** <=== name s/b saved!!
            tx.Commit();
        }
        PartyName foundName = foundParty.Names.First();
        //found.Look();

        Assert.That(foundName, Is.EqualTo(partyName));
        Assert.That(foundName.Party, Is.Not.Null);
        Assert.That(foundName.TheRequiredName, Is.EqualTo(partyName.TheRequiredName));
        Assert.That(foundName.EverythingElse, Is.EqualTo(partyName.EverythingElse));
        Assert.That(foundName.ContextUsed, Is.EqualTo(partyName.ContextUsed));
        Assert.That(foundName.Salutation, Is.EqualTo(partyName.Salutation));
        Assert.That(foundName.EffectivePeriod, Is.EqualTo(partyName.EffectivePeriod));
    }


NHibernate: INSERT INTO Parties (Type, PartyId) VALUES ('Parties.Domain.Party', @p0);@p0 = 32768 [Type: Int32 (0)]
NHibernate: SELECT party0_.PartyId as PartyId2_0_, party0_.Number as Number2_0_, party0_.CourseId as CourseId2_0_, party0_.Type as Type2_0_ FROM Parties party0_ WHERE party0_.PartyId=@p0;@p0 = 32768 [Type: Int32 (0)]

Answer 1

通过名称 inverse=true 的映射，您必须对集合的每个成员显式调用 session.Save(partyNameObject)。如果您希望 NHibernate 在保存 PartyObject 时自动保存集合的成员，则需要将 Names inverse 属性更改为 inverse=false 。这告诉 Nhibernate 您希望 Party 控制 Party 和 PartyName 之间的关系。您还必须记住将每个 partyNameObject 添加到 Party.Names 集合中。否则，当您调用 Session.Save(partyObject) 时，它们将不会被保存。请记住，让父级控制关系可能会很方便，但如果您碰巧在没有加载 PartyNames 集合的情况下保存 PartyObject，NHibernate 会将其 Party FK 更新为 Null。在这种情况下，如果在名称 上设置了某些 Cascade 选项，您可能会发现 Nhibernate 也会删除它们。