Creating a pseudo column in class-table mapping

Question

I would like to create a class (Reference) with attributes
long owner ;
long child ;
String childName ; // read only
This will be loaded into the owner object in a Vector.
This will be mapped to a database table (db_references) with columns
owner number; -- FK to owner
child number; --FK to child
We are setting a shallow load scheme where we are only pulling the keys of the child objects into the owner.
However, on load, I would like to be able to pull in the name of the child object as well as the key.
If I add the child table to the descriptor, inserts of the Reference class try to insert into child table which already has the row, throwing the predictable error.
This is another situation where my Oracle Forms experience must be blinding me to the correct solution. Any suggestions?

Answer 1

I gave up on the generic mapping class and mapping table endeavor.
In my current test, I created a read only SummaryClass that maps to a subset of the attributes on the FullClass.
The Vector in the OwnerClass is mapped to the SummaryClass in TopLink. I even created a view on the tables involved with the FullClass with just the attributes required by the SummaryClass. When I read the owner, I get the FullClass in the Vector. I even changed the PK in the view for the SummaryClass to not match that in the FullClass.
The FullClass objects are in the TopLink cache. There is no attempt to read the database on the read.
When I issue a
server.initializeIdentityMaps()
in the read statement.
Then the correct classes are returned on the read.
A less radical:
UnitOfWork uowSession = getUnitOfWorkSession();
uowSession.removeFromIdentityMap(thePlan);
in the read also works.
I am rather concerned that the returned class from a TopLink read changes based on the state of the read cache.
Any suggestions on how best to address this odd behavior?
Thanks