Re: What exactly happens when I use Core Data's 'Remove' button?
Re: What exactly happens when I use Core Data's 'Remove' button?
- Subject: Re: What exactly happens when I use Core Data's 'Remove' button?
- From: "I. Savant" <email@hidden>
- Date: Mon, 14 Aug 2006 10:36:11 -0400
[Sorry, didn't reply to the list, too, sending again.]
Have you tried setting a breakpoint on -[NSException raise] to see
exactly where the error is occurring and what the call stack looks like?
This seems to be a memory management problem.
--
I.S.
On Aug 14, 2006, at 10:21 AM, Arthur C. wrote:
You need to be more descriptive. For example, you say you're
getting a "selector not recognized" ... what selector isn't
recognized? Is it "-handleDeletion:"? We could probably assume as
much, but if we assume wrong, we end up only wasting our time.
The message is:
-[NSNull intValue]: selector not recognized (self = 0xa07b9218)
Exception raised during posting of notification. Ignored. -[NSNull
intValue]: selector not recognized (self = 0xa07b9218).
I was 'assuming' that those numbers wouldn't be any more
descriptive...
As to your problem ... at a guess, you're passing:
@"NSManagedObjectContextObjectsDidChangeNotification"
... when you should probably be passing ...
NSManagedObjectContextObjectsDidChangeNotification
Good point, fixed. I really thought that this thing was the name
(string) rather than a constant.
Now the method gets called anytime I change an object (as it
should). However, when using the remove button, still the same
error message...
Further suggestions?
Thanks so far,
Arthur C.
I don't know if this is your complete problem, but what you're
passing is definitely not right, so I'm willing to bet it's
definitely not helping. :-)
--
I.S.
On Aug 14, 2006, at 9:34 AM, Arthur C. wrote:
NSManagedObjectContext offers a notification named
NSManagedObjectContextObjectsDidChangeNotification. Observe
this and take appropriate action upon the managed objects
found in the user info dictionary under the key
NSDeletedObjectsKey.
I have tried that, but on removes I only receive an error
message saying 'selector not recognized'. The code is as follows:
@implementation ObjectToBeRemoved // has n instances
-(void) awakeFromInsert // same for awakeFromFetch
{
// ...
[[NSNotificationCenter defaultCenter] addObserver: self
selector:@selector(handleDeletion:)
name:@"NSManagedObjectContextObjectsDidChangeNotification"
object: nil];
}
- (void) handleDeletion: (NSNotification *) notification
//>>{
if ([self isDeleted])
{
// unregister for KVO
}
}
I definitely want the observer to be 'self', as I need to remove
it as KVO observer. Therefore I also need the reference to the
object that is observing 'self', which is only available from
inside this object.
Is this correct? I believe the handler should get called also
when an object is changed (in any way), added, or removed. But
all I get is the error message after using the remove button,
and the handler does not get called at all.
I hope you have a solution for this as well.
Best regards,
Arthur C.
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