Re: Core Data Problem

FROM : Christiaan Hofman
DATE : Wed Jan 09 18:57:06 2008

That's all not relevant info. The question is what you're doing to 
the data model. Are you inserting an ListItem object, and how? 
Changing a property of any object is not at all relevant to the add/
remove methods.

Christiaan

On 9 Jan 2008, at 3:17 PM, Steven Hatfield wrote:

> Christiaan,
>
> Thanks for your quick reply. You are absolutely correct, that's 
> what I get for posting before my morning intake of caffeine... ;-)
>
> To test it I am compiling in Debug mode, I placed a breakpoint on 
> the NSLog() line and pressed "Debug". I brought up the console and 
> the NSLog() call never fires, and the breakpoint is never hit, even 
> though I can see in the GUI that the object is being used. The 
> awakeFromInsert: *is* being called, I see NSLog() output in the 
> console from that method.
>
> My intention is to get the ListItem object that is being inserted 
> into the "Listing" object's ListItems (collection? What would it be 
> called? Like I said... I'm a newbie...), and modify one of its 
> properties, "itemNumber" to contain the count of the # of listItems 
> that are in the Listing to which it belongs.  I thought it best to 
> do this from the Listing object itself, since from the wording of 
> the method it receives some hint that a new listItem is being 
> inserted into it.
>
> It's really just a simple app to get familiar with Core Data, after 
> working through Hillegass' awesome intro to Mac OS X Programming 
> book. He doesn't cover Core Data, so it's very new to me...
>
> There are likely other, better ways to do this, but hopefully with 
> your help, I can figure it out.
>
> Thanks,
> Steven
>
> On Jan 9, 2008, at 8:16 AM, Christiaan Hofman wrote:
>

>> You've detailed the code part, but you didn't tell us what you did 
>> to test it. So we still do not know what actually failed. It may 
>> well be that your expectations are wrong. In fact, that seems to 
>> be the case from your explanation. You say that you have problems 
>> when the "NSManagedObject needs to set some data". That usually 
>> means changing a property. Than you go on describing methods to 
>> modify a relationship. So what are you actually modifying?
>>
>> Christiaan
>>
>> On 9 Jan 2008, at 2:05 PM, Steven Hatfield wrote:
>>

>>> Hi All,
>>>
>>> I am a newbie ObjC/Cocoa programmer, and I have a small core data 
>>> application that I am writing. Everything works fine when the 
>>> user enters data - save/open, display, etc.
>>> Where I am running into a problem is when the NSManagedObject 
>>> needs to set some data; I simply can't get the methods to be called.
>>>
>>> I used Xcode to generate the Managed Object Class, which includes 
>>> the code:
>>>
>>> @interface Listing (CoreDataGeneratedAccessors)
>>> - (void)addListItemsObject:(ListItem *)value;
>>> - (void)removeListItemsObject:(ListItem *)value;
>>> @end
>>>
>>> in the interface file, and I called the method in the 
>>> implementation file:
>>>
>>> - (void)addListItemsObject:(ListItem *)value
>>> {
>>>     NSLog(@"Here");
>>> }
>>>
>>>
>>> I have verified that the "awakeFromInsert:" method is called on 
>>> that class, and the code compiles fine, but I never see "Here" in 
>>> the console and when I put a breakpoint on the NSLog() line, it 
>>> is never hit.
>>>
>>> In the code listings in the NSPersistentDocumentTutorial, it 
>>> appears that this should work fine... what am I doing wrong?
>>>
>>> I appreciate any help.
>>>
>>> TIA,
>>> Steven
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>>
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