nhibernate cascade - problem with detached entities
- by Chev
I am going nuts here trying to resolve a cascading update/delete issue :-)
I have a Parent Entity with a collection Child Entities. If I modify the list of Child entities in a detached Parent object, adding, deleting etc - I am not seeing the updates cascaded correctly to the Child collection.
Mapping Files:
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="Domain"
namespace="Domain">
<class name="Parent" table="Parent" >
<id name="Id">
<generator class="guid.comb" />
</id>
<version name="LastModified"
unsaved-value="0"
column="LastModified"
/>
<property name="Name" type="String" length="250" />
<bag name="ParentChildren" lazy="false" table="Parent_Children" cascade="all-delete-orphan" inverse="true">
<key column="ParentId" on-delete="cascade" />
<one-to-many class="ParentChildren" />
</bag>
</class>
<class name="ParentChildren" table="Parent_Children">
<id name="Id">
<generator class="guid.comb" />
</id>
<version name="LastModified"
unsaved-value="0"
column="LastModified"
/>
<many-to-one
name="Parent"
class="Parent"
column="ParentId"
lazy="false"
not-null="true"
/>
</class>
</hibernate-mapping>
Test
[Test]
public void Test()
{
Guid id;
int lastModified;
// add a child into 1st session then detach
using(ISession session = Store.Local.Get<ISessionFactory>("SessionFactory").OpenSession())
{
Console.Out.WriteLine("Selecting...");
Parent parent = (Parent) session.Get(typeof (Parent), new Guid("4bef7acb-bdae-4dd0-ba1e-9c7500f29d47"));
id = parent.Id;
lastModified = parent.LastModified + 1; // ensure the detached version used later is equal to the persisted version
Console.Out.WriteLine("Adding Child...");
Child child = (from c in session.Linq<Child>() select c).First();
parent.AddChild(child, 0m);
session.Flush();
session.Dispose(); // not needed i know
}
// attach a parent, then save with no Children
using (ISession session = Store.Local.Get<ISessionFactory>("SessionFactory").OpenSession())
{
Parent parent = new Parent("Test");
parent.Id = id;
parent.LastModified = lastModified;
session.Update(parent);
session.Flush();
}
}
I assume that the fact that the product has been updated to have no children in its collection - the children would be deleted in the Parent_Child table. The problems seems to be something to do with attaching the Product to the new session? As the cascade is set to all-delete-orphan I assume that changes to the collection would be propagated to the relevant entities/tables? In this case deletes?
What am I missing here?
C
