[Rubycocoa-talk] Key Value Observing

[Rich W. <rw...@gm...>]

I thought I'd read that RubyCocoa supported Key Value Observing;  
however, I can't get the following to work:

require 'osx/cocoa'
OSX.require_framework 'CoreData'

class AppDelegate < OSX::NSObject

	def awakeFromNib()		
		@posts.addObserver_forKeyPath_options_context_(self, "content", 0,  
nil)
	end
	
	def observeValueForKeyPath_ofObject_change_context_(key_path, object,  
change, context)
		set_html() if object == @posts
	end

	...

end

When I run this code, I get the following error:

/Users/rikiwarren/Develop/Ruby/Test/build/Release/Test.app/Contents/ 
Resources/rb_main.rb:22:in `NSApplicationMain': Ruby object  
`#<AppDelegate:0xe3c90c class='AppDelegate' id=0x26dbbe0>' doesn't  
respond to the ObjC selector  
`observeValueForKeyPath:ofObject:change:context:', the method either  
doesn't exist or is private (RuntimeError)
	from /Users/rikiwarren/Develop/Ruby/Test/build/Release/ 
ArticleSandbox.app/Contents/Resources/rb_main.rb:22

Bindings seems to work fine, and I know that uses KVO heavily. Any  
idea what I'm doing wrong here?

-Rich-