Re: EOF Digest, Vol 23, Issue 1

   Maybe the whole concept of putting type information in the data is  
the problem. I think the solution is either to have a separate  
foreign key relationship to each entity. History for students would  
have null school id, history for school would have null history Id.  
If you want something more pure, try making the ChangeHistory a base  
class and make subclasses for SchoolHistory and StudentHistory. Each  
having the relationship to the entity for which history is to be  
tracked.
   This is similar to Nat's suggestion, only the subclassing is being  
done on the history side - create a subclass of history for each  
entity which needs history tracking.

T.

On Apr 27, 2006, at 1:00 PM, [email protected] wrote:

> I can not figure out how to specify the changeHistoryType part of the
> join in the EOModeler.
>



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