Or just make it a class property.  Some people find that offensive, but it 
won't cause problems for EOF.  Exposed FK does cause problems.

Chuck


On 2012-10-03, at 1:34 AM, Paul Hoadley wrote:

> Hi Johann,
> 
> On 03/10/2012, at 5:26 PM, Johann Werner wrote:
> 
>> derived attributes are "computed" by the database and thus those values are 
>> only updated when an eo is fetched into memory. In your case you are 
>> creating a new eo that has NULL for these attributes and as long as WO uses 
>> that eo or its snapshot cache those values will be still NULL. You have to 
>> refetch the eo to update the derived attributes.
> 
> Thanks for the explanation.  Looks like a derived attribute is not the 
> solution for this use case, then.
> 
> I wrote:
> 
>>> (As an aside, last time I looked at this was a few months ago, and I swear 
>>> it was behaving properly then—i.e., that the derived attribute was 
>>> immediately visible.)
> 
> Clearly I imagined that.
> 
> 
> -- 
> Paul Hoadley
> http://logicsquad.net/
> 
> 
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