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Re: Observing Undo in a Core Data App

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Re: Observing Undo in a Core Data App

Subject: Re: Observing Undo in a Core Data App
From: Joshua Scott Emmons <email@hidden>
Date: Fri, 24 Feb 2006 11:19:53 -0600

What do I observe to see if an item has been placed back into the NSManagedObject context via Undo. Undo works: the most recently deleted object is put back into the context - it's there when I restart the application and reload the array. I just need to know when an object is put back into the context so that I can update my UI on the fly. Any suggestions on how to do this?

My solution to this was to crate a base managed object, "Office". Office has a to-many relationship called "employees". My array controller adds and deletes Employee managed objects from this to- many relationship. Then, to recognize undo/redos, I just KVO Office's "employees" relationship.

This was a quick fix when I did it. I didn't look for a better way, and there very well might be one. But this worked well enough for me.

Oh, one more note. When proceessing the KVO with - observeValueForKeyPath:ofObject:change:context:, NSKeyValueChangeKindKey is NSKeyValueChangeRemoval on deletions and NSKeyValueChangeInsertion on insertions. But as I recall it's NEITHER on undos and redos. Just a heads up.

Cheers, -Joshua Emmons _______________________________________________ Do not post admin requests to the list. They will be ignored. Cocoa-dev mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden References: >Observing Undo in a Core Data App (From: Michael Clark <email@hidden>) Prev by Date: Re: double-binding? Next by Date: String causes NSLog to crash Previous by thread: Observing Undo in a Core Data App Next by thread: Re: Observing Undo in a Core Data App Index(es): Date Thread