Hi everybody !

I encountered a problem using a Many-To-One Relation and the inheritance mapping feature. I using the table-per-subclass strategy.

I'm not sure if my mapping/configuration is wrong or NHibernate does not support the fuctionality I try to use.

I will try to describe my scenario with code:

class SomeClass
{
// this property is mapped via many-to-one
public virtual MappedClass MyClassObject
{
get... set...
}
}

class MappedClass
{ // some stuff here }

class MappedSubClass : MappedClass
{ // some more stuff here }


If I set the propertry

someClass.MyClassObject = new MappedSubClass();

everything is correctly stored in db. You may have recognized: I stored the inherited class and not the base class the mapping was actually written for.

If I try to access the MyClassObject after the next load, a ProxyObject is present. That's ok. I can cast the Proxy object to MappedClass.

BUT: I can't cast the Proxy object MappedSubClass. The Proxy object generated by NHibernate has the base MappedClass. If i load the object via the Id manually, it actually is of type MappedSubClass.

if I disable Lazy loading, the Property MyClassObject contains an object of type MappedSubClass, which is correct. So the problem seems to be the proxy. No matter which actual sub-class the reference points to, NHibernate always creates a proxy for the base class.

Is this a known behaviour? Is there a way use proxy is this scenario anyhow?

Thanks for help,
Thomas

NHibernate Version: 1.2.0.GA

I have the exact same problem. Did you solve this yet?

Your solution may be in this document:

http://www.hibernate.org/280.html

Perfect. Thanks!