Ah, it is interesting that you say this, because now suddenly I realize that
the problem might be related to bindings (although I'm not sure).
Please follow these simple steps to make a very simple test app that
demonstrates my issue:
1) Create a new "Core Data Application" project in Xcode.
2) Add an Employee entity with the 'name' (String) attribute.
3) Open the XIB file, and onto the window add a table view with one column and
two buttons called "Add" and "Remove".
4) Add an NSArrayController into the XIB. Bind it to the app delegate's
managedObjectContext and set the Employee entity and "Prepares content" as
usual.
5) Bind the table column to the array controller's arrangedObjects.name as
usual.
6) Connect the Add and Remove buttons to the NSArrayController's add: and
remove: methods respectively.
7) Back in the code, paste the following into the app delegate's source file:
- (void)awakeFromNib
{
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self
selector:@selector(contextChanged:)
name:NSManagedObjectContextObjectsDidChangeNotification
object:[self managedObjectContext]];
}
- (void)contextChanged:(NSNotification *)note
{
NSSet *inserted = [[note userInfo] objectForKey:NSInsertedObjectsKey];
NSSet *updated = [[note userInfo] objectForKey:NSUpdatedObjectsKey];
NSSet *deleted = [[note userInfo] objectForKey:NSDeletedObjectsKey];
NSLog(@"contextChanged. inserted %d. updated %d. deleted %d.",
[inserted count],[updated count],[deleted count]);
}
8) Play with this app. You will see that the notifications are properly getting
sent.
9) Now add "[[[self managedObjectContext] undoManager]
disableUndoRegistration];" to the top of awakeFromNib.
10) As you now play with the app, you will notice that the notification is NOT
getting sent except when the app quits (and the context saves).
Can you guys help me analyze why, when using bindings like this,
NSManagedObjectContextObjectsDidChangeNotification is not getting sent anymore
when undo is disabled?
----------------------------------------
> From: [email protected]
> Date: Sat, 1 Aug 2009 13:58:07 -0700
> To: [email protected]
> Subject: Re: Disabling Undo in Core Data
>
>
> On Aug 1, 2009, at 5:11 AM, Squ Aire wrote:
>
>> 1) In awakeFromNib, call either [[self managedObjectContext]
>> setUndoManager:nil]; or [[[self managedObjectContext]
>> undoManager] disableUndoRegistration]; This certainly works, but
>> the problem with this is that the
>> NSManagedObjectContextObjectsDidChangeNotification will stop being
>> sent when the context changes!
>>
> It's not clear why you make this assertion? A simple test shows this
> is not the case...
>
> Did you register for
> NSManagedObjectContextObjectsDidChangeNotification or
> @"NSManagedObjectContextObjectsDidChangeNotification"?
>
> mmalc
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