[Rubycocoa-talk] valueForKey:@"changed" == @"YES" ??? (ObjC vs. RubyCocoa strings ?)

[Rupert B. <rup...@fr...>]

Hi,

I've been spending most of the night trying to understand the  
following problem :

I have Objective-C checking for changed objects like this :

	while (record = [recordEnumerator nextObject]) {
		NSLog(@"record changed=%@, class=%@, res=%@",
					[record valueForKey:@"changed"],
					[[record valueForKey:@"changed"] class],
					[record valueForKey:@"changed"] == @"YES");
		if ([record valueForKey:@"changed"] == @"YES")
			[changedRecords addObject:record];
	}
	NSLog(@"changedRecords=%@", [changedRecords description]);

I have RubyCocoa code updating these objects like this :

	def changed
		@_changed
	end
	self.addRubyMethod_withType("changed".to_sym, "v@:@")
	def setChanged(v)
		@_changed = v
	end
	self.addRubyMethod_withType("setChanged:".to_sym, "v@:@")
	def setChangedYes
		setChanged(OSX::NSString.alloc.initWithString("YES"))
	end
	def setChangedNo
		setChanged(OSX::NSString.alloc.initWithString("NO"))
	end

When I run the program, the traces from the Objective-C code show :

	record changed=YES, class=NSCFString, res=(null)
	record changed=YES, class=NSCFString, res=(null)
	record changed=YES, class=NSCFString, res=(null)
	record changed=YES, class=NSCFString, res=(null)
	record changed=YES, class=NSCFString, res=(null)
	changedRecords=()

What is going on ?  I have made every effort for the two ObjC and  
RubyCocoa strings be equal : same value ("YES"), same class  
(NSCFString); what else ?  Why does the test
		if ([record valueForKey:@"changed"] == @"YES")
never verify ?


Thanks for any help, I'm going to bed    %:(
Rup