Re: Cocoa-dev Digest, Vol 2, Issue 878
Re: Cocoa-dev Digest, Vol 2, Issue 878
- Subject: Re: Cocoa-dev Digest, Vol 2, Issue 878
- From: "Ian G. Gillespie" <email@hidden>
- Date: Fri, 10 Jun 2005 15:34:43 -0400
I have a binary attribute in one of my core data entities called,
"selectionIndexPaths".
Just to be sure, do you mean that in your model you have defined an
attribute, "selectionIndexPaths", as a binary attribute?
This is correct.
In IB I bound a tree controller with this key path to the selection
of an array which contains the entities. I also used the
NSUnarchiverFromData value transformer in IB. However, when ever I
save I get this message, "-encodeInt:forKey: only defined for
abstract class. Define -[NSArchiver encodeInt:forKey:]! " I am
not sure what this means, where do I need to define it? I thought
NSIndexPath conformed to the NSCoding protocol?
Oh, that's interesting. A test reveals that NSIndexPath fails with
NSArchiver, but succeeds with NSKeyedArchiver...
Rather than using the value transformer in IB, you should define a
transient attribute for the attribute, add a persistent attribute for
the data (e.g. selectionIndexPathsData), and incorporate the
transformation in your accessor method as outline in <http://
developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/
cdNSAttributes.html>
This worked great. Thanks for your help.
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