Re: Undo and Core Data issue

FROM : Michael Latta
DATE : Thu Mar 06 06:31:57 2008

I just ran a test where I commented out the calls that start/end 
grouping.  Now the undo menu item is not enabled.  This suggests that 
either the UI is not using the same undo manager as CoreData, or the 
changes are not being recorded.  Back to the documentation.

Michael


On Mar 5, 2008, at 7:53 PM, Ben Trumbull wrote:

> At 6:58 PM -0800 3/5/08, Michael Latta wrote:

>> The calls are on the Will/Did undo/redo notifications not the KVO 
>> callbacks on object changes.

>
> Ah, okay.  There shouldn't be any need to call -
> processPendingChanges there, unless you're programmatically working 
> with your own undo groups.
>

>> What I am seeing is that my code changes a managed object property, 
>> I undo, and no change occurs in the managed object.  The property 
>> affected is a binary attribute (a CATransform3D as bytes).

>
> Does your code changing the property trigger a KVO event (i.e. are 
> you missing a call to -willChangeValueForKey:) ?  Do you see 
> notifications from the MOC when you initially make the change ?
>
> Are you undoing programmatically or as a user ?
>

>> The undo behaves the same as before I added any notification 
>> processing however.

>
> That suggests the problem lies elsewhere.
> --
>
> -Ben