Re: Core Data and @count keypath
Re: Core Data and @count keypath
- Subject: Re: Core Data and @count keypath
- From: GbT <email@hidden>
- Date: Thu, 9 Feb 2006 14:54:32 +0100
My first question was:
I have an Author entity displayed... for every author I'd
like to display how many books they wrote, so my relationship would
be: Author-->>Books.
>From what someone wrote, I should bind the value property to
AuthorArrayController - arrangedObjects - books.@count, but this
doesn't work, it gives me the error:
*** NSRunLoop ignoring exception '[<_NSFaultingMutableSet 0x3c5d30>
addObserver:forKeyPath:options:context:] is not supported. Key path:
@count' that raised during posting of delayed perform with target
37e980 and selector 'open:'
The selector open is related to the drawer attached to the window...
but the addObserver
thing isn't clear to me...
2006/2/9, GbT <email@hidden>:
> Thanks very much!
>
> Any ideas on my first question? :)
>
> 2006/2/9, Jim Correia <email@hidden>:
> > On Feb 9, 2006, at 7:27 AM, GbT wrote:
> >
> > > Should I subclass NSTableColumn anyway? I think so because I can't put
> > > my custom nscell directly in interface builder... right?
> >
> > Even if you couldn't set it up directly in IB, I think subclasses is
> > overkill here. In this situation I'd just wire up the cell
> > programatically in -awakeFromNib or -windowDidLoad.
> >
> > But you can set up the custom cell in IB. First drag a
> > NSTextFieldCell to your column, select the cell via the configuration
> > widget in the top right of the column header, and set its custom
> > class as usual.
> >
> > Jim
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