I have a hierarchy of entities like so:
A is the super entity, B extends A (A is not abstract)
I have records in the database representing objects of both types.

Creating qualifiers for any value is easy with ERXKey. But what if I want to limit the query to only A objects or only B objects? The problem here is that all Bs are also As. Filtering As might thus also return some B objects.

I would want to create a qualifier based on the object’s absolute class.

Currently I handle this by including the qualifying field for the classes (single table inheritance). This works but seems to be kind of ugly. Is there a better more elegant way?

Probably more of academical interest.....

---markus---