Hi
I am confused about how NHibernate treats orphan objects and would like
some clarification on this subject. Please see below for my simple test
case. When I run this test case I expect the child object "sequence" to be
deleted from the DB but this isn't the case, instead I am left with an
orphan object. The documentation on many-to-one,
http://www.nhforge.org/doc/nh/en/index.html#mapping-declaration-manytoone,
states that the cascade option:
"Specifies which operations should be cascaded from the parent object
to the associated object"
To be honest, I'm not sure if this means that my delete scenario is
supported or if the cascade option only comes into play when the parent
object is deleted.
So to summarise my questions are:
1. Does NHibernate support many-to-one deletes as in the unit test, and
if so what is wrong with my test case.
2. If NHibernate does not support this scenario what is the logic behind
not supporting it.
3. If NHibernate does not support this scenario is there a work around
so child objects can be deleted by their parents from within the domain
model and be deleted within the DB.
Thanks in advance
Michael
NB. I have also tried using one-to-one and described by Ayende (
http://ayende.com/blog/3960/nhibernate-mapping-one-to-one) with the same
results.
--------------------------------Class
declarations---------------------------------------------
public class Host
{
public virtual int id { get; set; }
public virtual Sequence sequence { get; set; }
}
public class Sequence
{
public virtual int id { get; set; }
}
--------------------------------XML
declarations---------------------------------------------
<class name="Host">
<id name="id">
<generator class="native" />
</id>
<many-to-one name ="sequence" cascade="all" />
</class>
<class name="Sequence">
<id name="id">
<generator class="native" />
</id>
</class>
--------------------------------Unit
Test---------------------------------------------
[TestFixture]
public class Fixture : BugTestCase
{
[Test]
public void CanDeleteChild()
{
Host host = new Host();
Sequence sequence = new Sequence(); ;
host.sequence = sequence;
using (var s = OpenSession())
{
using (s.BeginTransaction())
{
s.SaveOrUpdate(host);
s.Transaction.Commit();
}
s.Close();
}
int sequence_id = sequence.id;
using (var s = OpenSession())
{
using (s.BeginTransaction())
{
sequence.host = null;
sequence = null;
host.sequence = null;
s.SaveOrUpdate(host);
s.Transaction.Commit();
}
s.Close();
}
using (var s = OpenSession())
{
Assert.IsNull(s.Get<Sequence>(sequence_id));
sessions.Close();
}
}
}
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