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Observing 'many' managed objects in custom view
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Observing 'many' managed objects in custom view


  • Subject: Observing 'many' managed objects in custom view
  • From: Jerry Krinock <email@hidden>
  • Date: Sat, 29 Sep 2007 17:18:10 -0700

I'd like my custom view, not an NSTableView, to display many objects of a Core Data entity, filtered and sorted. I've got it 90% working, but the difficulty I'm having with the last few issues makes me think that maybe my whole approach is wrong. My custom view does not have any exposed bindings, so I observe using KVO. (The NSArrayController/ NSManagedObjectContext binding is read-only anyhow.)

1. Should/Must I have an NSArrayController? Only NSObjectController and its subclass NSArrayController seem to have the capability of operating in "Entity" mode and binding to an NSManagedObjectContext. In the Cocoa Bindings Reference [1], NSManagedObjectContext is not even listed. Yet, in Interface Builder, NSObject/ArrayController can, via my App_Delegate, bind to it (although in [1] this is called "register"). Are there any examples of viewing the "many" managed objects of a given entity in a moc without an NSArrayController?

2. Can I use the filtering and sorting capabilities of the array controller? Seems wasteful not to, but...

3. If so, what key in the array controller can I observe? Issues: 'content' seems to be the only key that is KVC, but it does not change and therefore does not send observeValueForKeyPath:::: when object property changes cause a change in the sorted/filtered output. arrangedObjects seems to mostly work but is not KVC (i.e. there is no -setArrangedObjects method). Is that OK, since I'm only 'reading'?

4. What is the underlying problem with my approach which is causing these (and a few other) headaches?

Thanks!

Jerry Krinock

[1] http://developer.apple.com/documentation/Cocoa/Reference/ CocoaBindingsRef/index.html

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