On Feb 12, 2014, at 1:53 PM, Eric Atkin <eat...@certusllc.us> wrote:
> Yeah sorry I missed that. conversion is an attribute on Measured_Source. > So the intent is that a Production_Load is a Load with its own additional > attributes over Load as well as a constraint that its source is a > Measured_Source which has its own attribute extensions over Source. One of > the goals here is to add that constraint enforcement. I was able to make it > work with the following hybrid_method and hybrid_method.expression, but the > isinstance(Production_Load.source, Measured_Source) enforcement is missing. well you’d make two relationships and your hybrid method would make the choice between which one is being accessed.
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