Can't make undo & redo to work in cocoa core data app

Question

I have problem to implement undo and redo in my core data cocoa application. This is second question that I am asking on same topic, (you can read my first question here) and even that I get solid advice on my first question, I still can't make undo and redo to work.

Anyway...here is my current code:

Here is the relevant code from MainWindowController.h file:

#import <Cocoa/Cocoa.h>
#import "AppDelegate.h"

@property (nonatomic,strong) NSManagedObjectContext *mObjContext;
@property AppDelegate *appDelegate;

Here is the code from the MainWindowController.m file:

#import "MainWindowController.h"
@interface MainWindowController () <NSWindowDelegate>

@end

@implementation MainWindowController

- (void)windowDidLoad {
    self.appDelegate = (AppDelegate*)[[NSApplication sharedApplication] delegate];
    self.mObjContext = self.appDelegate.managedObjectContext;
    [[self window]setDelegate:self];
    [self windowWillReturnUndoManager:self.window];
}

- (NSUndoManager *)windowWillReturnUndoManager:(NSWindow *)window
{
    return [[self document] undoManager];
}

@end

My window has the following Outlets in connection inspector: delegate: File's owner

Menu: MainMenu

Whenever I make changes in the records in my nstableviews, changes are recorded but undo and redo menu items remain gray. I placed break point in windowWillReturnUndoManager, but I can't see any undoManager returned there...Can anyone tell me what I am doing wrong?

Answer 1

Well, the issue is finally solved. I add new edit menu item, while keeping the old one. When I make change in the record, the new menu item had undo item available and worked. Redo worked too.

So I delete the old edit menu item, and now everything works like a charm. Too bad that I didn't try this earlier, but....