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Re: How to observe every child entity

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Re: How to observe every child entity

Subject: Re: How to observe every child entity
From: Kyle Sluder <email@hidden>
Date: Mon, 14 Sep 2009 08:23:23 -0700

On Sep 14, 2009, at 5:09 AM, Matthew Lindfield Seager <email@hidden > wrote:

I have a transient calculatedBalance property in my Account entity
that is currently implemented as a read-only property returning:
[self valueForKeyPath:@"email@hiddent"]

This appears to work but I'd like observers of this property to be
notified every time a transaction is added, modified or removed.

If the only reason you want this is so that observers of calculatedBalance are notified when transactions changes (and therefore calculatedBalance), implement - keyPathsAffectingCalculatedBalance: to return a set that includes @"transactions".

--Kyle Sluder
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