Lack of collection merging and splitting as first class concepts is a bit fiddly… I initially wrote:

@rule(GenericTestResult, [Select(HydratedTarget)])

and found that that doesn’t work because I can’t actually get a

HydratedTarget

, I can only get a

HydratedTargets

over which I can iterate, which in turn means my rule needs to return a

GenericTestResults

not a

GenericTestResult