has_a with complex primary keys

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I'm attempting to CDBI-ify a legacy system, which has some tables like
this:

 batch: ( *batchid, ... )
 unit : ( *batchid, *unitid, ... )
 test : ( *batchid, *unitid, *testid, ... )

The stars denote PK columns.

It's easy to say that Unit->has_a(batchid =3D> 'Batch')

I can't seem to say, though, that test->has_a(? =3D> 'Unit')

Is this possibly, using some semantics that I haven't managed to
decypher, or am I going to need to hack about in there?

--=20
rjbs

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