On Mar 31, 2010, at 7:48 PM, Ramsey Lee Gurley wrote:
I can't see this being possible in Vertical or Horizontal, but with
single table... could the qualifying attribute be updated to
'promote' an entity to a new class?
F**k No!
Do NOT try this. Use the Role pattern or something that won't make
EOF insane.
Let's say we have we have an abstract Person entity with three
subclasses, Peasant, Knight, King. If I wanted to promote a knight
to king, is it possible to simply update my type attribute from
knight to king and EOF will start treating that record as a king
instead of a knight? I would assume I would need to invalidate the
existing knight object after saving changes so it could be refetched
as a king... and if I had multiple instances, I'd need to invalidate
it in those instances too... but is it possible? Or will EOF just
flip out in the saveChanges() and refuse to do it?
Just an academic question, of course (^_^)
You could maaaaybe get it to work if you invalidated enough things.
But, really, do you want hair on your palms?
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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