2009/9/15 Kyle Sluder <kyle.slu...@gmail.com>: > 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".
That was my original implementation but unless I was doing something wrong it only updates when the transactions relationship changes (i.e. add or remove a transaction). I need that behaviour but I also need it to update if an individual transaction's balance is changed. The FAQ and KVO programming guide (http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/CoreData/Articles/cdFAQ.html and http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/KeyValueObserving/Concepts/DependentKeys.html) both have the same info and point me to observing either every child or the managed object context (as per my original post) but the devil is in the detail. Although, as I write this I've just had a thought that I'm probably over-complicating things... Instead of trying to observe every child by monitoring the to-many transactions relationship perhaps I can simply flip the problem around. It should be quite simple to add the parent account as an observer in the transaction implementation (and then if the account relationship changes just remove the old parent as an observer and add the new one). I'll try that approach and report back. Apologies for wasting people's time if that's what I should have been doing all along! Matt _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
