[Rubycocoa-talk] problems with NSOutlineView and DataSource mixed with Bindings

[Stephyn B. <ste...@co...>]

Dear all,

Thank you for your forbearance...as I'm not sure this is exactly a  
RubyCocoa question.

I've written an application that quite successfully uses a bunch of  
NSArrayControllers to manipulate a bunch of models using Bindings.  
However, one part of the application requires a user to manipulate  
something that is best represented as a tree. Therefore, I'm using the  
NSOutlineView. I'm not using the NSTreeController based many comments  
and posts I've seen on the Internet which say to avoid it especially  
if the user is manipulating the tree.

Based on an example I found online, "OutlineMeRuby", I successfully  
implemented a NSOutlineView and DataSource that do what I want them to  
do. The problem is that now, I'm trying to integrate this editor into  
the other, binding-based editors of my application. So that when  
someone selects a Model in one tab, they can start editing one of the  
properties of that Model, which is a tree. The actual building of the  
tree is complicated because the nodes that are actually displayed are  
a facade for the real tree.

So basically, I have my DataSource do this:

class FaultTreeDataSource < NSObject
	ib_outlets :outlineView, :tests, :testsAlias, :modelsAlias

	def awakeFromNib
		self.bind_toObject_withKeyPath_options_( "root", @modelsAlias,  
"selection.entry", nil)
	end
   	
	@root = nil
	def root=( object)
		@root = object
		NSLog( "the root was set to #{@root}")
		@outlineView.reloadItem @root
	end
	
	def root
		NSLog( "root getter is returning #{@root}")
		@root
	end
# more methods for DataSource, addChild, etc.
end

Based on the NSLog output, the root object is most definitely being  
set through the bindings and it is a FaultTreeDisplayNode.

For the longest time, I couldn't get the NSOutlineView to acknowledge  
the @root object at all. Even though this same code worked previously  
without bindings.

Now I'm getting the following error when I click the tab that displays  
the NSOutlineView:

2008-08-02 22:13:48.481 FaultTreeDiagnosis[1682:10b] root is  
<FaultTreeDisplayNode: 0x5c8000>
2008-08-02 22:13:48.482 FaultTreeDiagnosis[1682:10b] root getter is  
returning <FaultTreeDisplayNode: 0x5c8000>
2008-08-02 22:13:48.482 FaultTreeDiagnosis[1682:10b] *** - 
[FaultTreeDisplayNode copyWithZone:]: unrecognized selector sent to  
instance 0x5c8000
/Users/stephyn/Desktop/rubycocoa/projects/FaultTreeDiagnosis/build/ 
Debug/FaultTreeDiagnosis.app/Contents/Resources/rb_main.rb:22:in  
`NSApplicationMain': NSInvalidArgumentException - *** - 
[FaultTreeDisplayNode copyWithZone:]: unrecognized selector sent to  
instance 0x5c8000 (OSX::OCException)
	from /Users/stephyn/Desktop/rubycocoa/projects/FaultTreeDiagnosis/ 
build/Debug/FaultTreeDiagnosis.app/Contents/Resources/rb_main.rb:22

I have no idea why the FaultTreeDisplayNode is being sent the  
copyWithZone selector nor have I ever seen anything that requires you  
to do so for either Bindings or DataSources.

Any ideas?

Cheers,
Steve