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Re: Undo and Core Data issue
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Re: Undo and Core Data issue


  • Subject: Re: Undo and Core Data issue
  • From: Michael Latta <email@hidden>
  • Date: Wed, 5 Mar 2008 21:26:53 -0800

Here are the accessor methods I use for the property:


- (NSData*)transform { [self willAccessValueForKey:@"transform"]; NSData *result = [self primitiveValueForKey:@"transform"]; [self didAccessValueForKey:@"transform"]; return result; }

- (void)setTransform:(NSData*)value_ {
    [self willChangeValueForKey:@"transform"];
    [self setPrimitiveValue:value_ forKey:@"transform"];
    [self didChangeValueForKey:@"transform"];
}

These were generated by mogen. I will try to see what is up with the managed object context notifications though.

The undo is by the user from the menu or keyboard. I do create some undo groups to batch up related changes. The undo group logic was lifted from an earlier application. If I fail to close a group would that cause this? Are there things to worry about when mixing calls to the undo manager and Core Data?

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

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References: 
 >Re: Undo and Core Data issue (From: Ben Trumbull <email@hidden>)
 >Re: Undo and Core Data issue (From: Michael Latta <email@hidden>)
 >Re: Undo and Core Data issue (From: Ben Trumbull <email@hidden>)

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