FIXED: NSTreeController, sorry for the multiple posts!
FIXED: NSTreeController, sorry for the multiple posts!
- Subject: FIXED: NSTreeController, sorry for the multiple posts!
- From: Adam Hall <email@hidden>
- Date: Sat, 8 Sep 2007 11:43:13 -0400
Ok, the problem was that the "children" relationships had different
names!
I dropped an NSTreeController into my nib file for a small Flash
Card app I decided to throw together quickly for my 3 year old to
practice with. However, I am getting an error that looks to me like
NSFaultingMutableSet is saying the object attribute being referred
to in the children key path for my the NSTreeController is invalid.
The key path is referring to a string attribute of a class which is
linked to the parent through a relationship defined in the data
modeler. Wow, that was a mouthful. This is a small little app that
is not mission critical for some Enterprise, its not going to
change the world or anything, its just for a little girl to help
her with her Chinese lessons, but its more important to me than
anything right now to get it running for her. :-) . I appreciate
any insight into what I may be doing wrong, or perhaps a heads up
about dealing with NSTreeController in this case. The data and
paths do work perfectly fine with a "regular" NSArrayController/
NSTableView VS the NSTreeController/NSOutlineView. I will continue
to work through the problem and if I figure it out I will post a
message here, its just I never had occasion to use the
NSTreeController before tonight. A little of subject - I started
an IRC channel on irc.freenode.org called #coredata, I hang in
there to try and help other people with Core Data as best I can. At
first I thought my abilities might not be helpful, but I was able
to help a guy track down a serious resource issue he was having
with predicates tonight, so it was nice to feel I can help in a
small way to promote Core Data, which I feel is a wonderful
technology but sometimes can be difficult to get help with on IRC.
Here is the exception being thrown in my app, the children key path
is set as pxrelationship_flashcard.pxattribute_name in Interface
builder with the Lesson as (Entity) name:
[<_NSFaultingMutableSet 0x5d4cda0>
addObserver:forKeyPath:options:context:] is not supported. Key
path: pxattribute_name
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