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Re: Removing object as observer in -willTurnIntoFault
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Re: Removing object as observer in -willTurnIntoFault


  • Subject: Re: Removing object as observer in -willTurnIntoFault
  • From: Sean McBride <email@hidden>
  • Date: Mon, 31 Mar 2014 15:02:28 -0400
  • Organization: Rogue Research Inc.

On Mon, 31 Mar 2014 04:29:51 -0500, Dado Colussi said:

>> Question: You do some initialization, adding observers for example, in
>> -awakeFromInsert and -awakeFromFetch, and you tear down these
>> initializations, removing observers for example, in -willTurnIntoFault.  Do
>> you need to do anything in -awakeFromSnapshotEvents: ?
>
>I don't start observers in -awakeFromInsert or -awakeFromFetch. I start
>them on demand, and in -awakeFromSnapshotEvents: with
>NSSnapshotEventUndoDeletion
>(I ignore the other flags). I think the best place to start observers
>depends on how the objects are used.

I also never start/stop KVO in any of my managed object subclasses.  Mismatching KVO start/stop throws exceptions and it always seemed to me there's no bulletproof place to start/stop in the context of managed object lifetimes.

(But I seem to have a pretty different experience vs Jerry.  I've found optional and transient to work quite nicely and are quite useful.)

Cheers,

--
____________________________________________________________
Sean McBride, B. Eng                 email@hidden
Rogue Research                        www.rogue-research.com
Mac Software Developer              Montréal, Québec, Canada



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References: 
 >Removing object as observer in -willTurnIntoFault (From: Jerry Krinock <email@hidden>)
 >Re: Removing object as observer in -willTurnIntoFault (From: Dado Colussi <email@hidden>)
 >Re: Removing object as observer in -willTurnIntoFault (From: Jerry Krinock <email@hidden>)
 >Re: Removing object as observer in -willTurnIntoFault (From: Dado Colussi <email@hidden>)

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