define Cow as
class Cow {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key id;
@Persistent
@Extension(vendorName="datanucleus", key="gae.parent-pk",
value="true")
private Key farmKey;
}
If you set farmKey to farm id then both farm and cow will be in the
same entity group.
this code should work:
tx.begin()
Farm f = getFarm();
Cow c = new Cow();
c.setFarmKey(f.getId());
f.incCowCounter();
pm.makePersistent(c); //if you need to know new cow id.
tx.commit();
Andrey
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