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Re: CoreData - re-faulting object and removing self-observers results in messages being sent to zombie
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Re: CoreData - re-faulting object and removing self-observers results in messages being sent to zombie


  • Subject: Re: CoreData - re-faulting object and removing self-observers results in messages being sent to zombie
  • From: Jim Correia <email@hidden>
  • Date: Wed, 3 Aug 2005 22:04:51 -0400

On Aug 3, 2005, at 9:29 PM, Jim Correia wrote:

On Aug 3, 2005, at 5:31 PM, Frank Illenberger wrote:


1. willChangeValueForKey/didChangeValueForKey are only called when there is actually some object obeserving the key. This is an optimization new to Tiger. In Panther, these methods were called even when there was no one observing. So this is not a good place to hook in.


Frank,

Is this documented someplace? Is it true even for subclasses of NSManagedObject?

If I take my previous example, add a magicString string attribute to Person, and implement person like this

[...]

didChangeValueForKey is called for magicAttribute even though there are no observers (or UI objects bound to that key.)

I did notice, however, that didChangeValueForKey is not called for dependent keys unless there is an observer. Is this what you are saying, or are you saying something more general?


Jim
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References: 
 >Re: CoreData - re-faulting object and removing self-observers results in messages being sent to zombie (From: Frank Illenberger <email@hidden>)
 >Re: CoreData - re-faulting object and removing self-observers results in messages being sent to zombie (From: Jim Correia <email@hidden>)

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