I'm trying to implement a source list type of NSOutlineView, where each section
of the source list has a SourceListSection object. Each SourceListSection
object has an NSArrayController, filled with a different type of managed object
from core data. The NSOutlineView is populated through bindings to the
NSTreeController, whose content is an NSArrayController of SourceListSections.
I use - (NSString *)childrenKeyPathForNode:(NSTreeNode *)node to return
different children key paths based on the node's representedObject. For the
SourceListSection I return @"itemsController.arrangedObjects" and for the
managed objects I return @"children".
- (NSString *)childrenKeyPathForNode:(NSTreeNode *)node
{
id rep = [node representedObject];
if ([rep isKindOfClass:[SourceListSection class]])
return @"itemsController.arrangedObjects";
return @"children";
}
The problem is that when I edit the table entry for a managed object (just a
name attribute), then valueForKeyPath:@"itemsController.arrangedObjects" is
sent to the managed objects, where @"children" should be sent instead.
Is the parent's keyPath being wrongly sent to its children in Cocoa, or am I
misusing childrenKeyPathForNode:? There is very little documentation, blogging,
of other discussions about childrenKeyPathForNode: that I can find. Perhaps
because it is not used very much?
Should I avoid using childrenKeyPathForNode:, work around its quirks, or just
use it correctly (how?) ? Any enlightenment would be appreciated. Thanks.
john terranova
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