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Re: Detecting eo changes when they happen
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Re: Detecting eo changes when they happen


  • Subject: Re: Detecting eo changes when they happen
  • From: Chuck Hill <email@hidden>
  • Date: Tue, 10 Oct 2006 12:54:51 -0700

Hi Florijan,


On Oct 10, 2006, at 9:03 AM, Florijan Stamenkovic wrote:

Hi all,
I am trying to find a way to detect changes eos just *after* they happen. If possible the implementation should consider the Author object changed, if one of his Books has been unassociated / deleted.


I tried with EOEditingContext notifications, but they are posted only at save time. I also could not find anything to fit the purpose in Project Wonder, yet.

There is something there, but I forget the name.


If nothing like that exists, I am thinking of implementing it through a notification posting EOGenericRecord subclass. Any comments or tips about this?

There is a discussion and implementation of what you want in Practical WebObjects starting on page 67. You really need the help of the EC.



One more question: EOs are not automatically removed from to-many relationships after being deleted, even when their delete rule is set to nullify. Is this another client side EOClassDescription bug, or a standard behavior?

That is standard behavior. Delete rules are processed as part of the preparation work done in saveChanges(). You can call ec.processRecentChanges() to force this to happen earllier.


Chuck


--

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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