Re: [Rubycocoa-talk] Possible bug in key-value handling in RubyCocoa

[Brian M. <ma...@ex...>]

I'm confused by the Objective-C version. It doesn't have the  
MyDocument.m method startObservingPerson (on p. 146 of Hillegass). It  
shouldn't work without setting up observing. (I can't check - won't  
build in my older version of Xcode.)

Am I looking at the wrong pages?

On Jan 26, 2009, at 1:24 PM, Steven D. Arnold wrote:

> Following up on my previous post related to the "raiseman"  
> application covered in Aaron Hillegass's Cocoa Programming for Mac  
> OS X.....  I implemented the same program in Objective-C, an  
> identical analogue to the program in Ruby, and it works fine in  
> Objective-C.  That is, the expected methods to insert and remove  
> "employee" objects (see below) are called in Obj-C but not  
> RubyCocoa.  That tells me there is a bug in the RubyCocoa interface  
> that prevents key-value coding from working properly.....or possibly  
> I am missing some detail in my implementation of the RubyCocoa  
> program.  The Objective-C project which works fine is attached.  Run  
> the program, and then add several records and undo them by typing  
> command-Z (or selecting undo from the Edit menu).  If you do this,  
> the key-value coding will work fine, that is, the following methods  
> will be called to undo and redo:
>
> - (void)insertObject:(Person *)p inEmployeesAtIndex:(int)idx
> - (void)removeObjectFromEmployeesAtIndex:(int)idx
>
> The equivalent methods in the Ruby implementation are not called:
>
> 	def insertObject_inEmployeesAtIndex(p, index)
> 	def removeObjectFromEmployeesAtIndex(index)
>
> I have also tried these Ruby methods with a trailing _ just to be  
> sure that's not the problem.  It didn't change the result.
>
> steven
>
>
> <raiseman-objc.zip>
>
>
>
>
> On Jan 24, 2009, at 11:33 PM, Steven Arnold wrote:
>
>> Hello, I am working through the book Cocoa Programming for Mac OS X  
>> by Aaron Hillegass using RubyCocoa rather than Objective-C, and I  
>> am at the section where we are attempting to implement undo for the  
>> add new employee and delete new employee buttons.
>>
>> My controller object as an @employees array as a member value.   
>> Given this name, I have implemented, in my controller, the functions:
>>
>>   insertObject_inEmployeesAtIndex(p, idx), and
>>   removeObjctFromEmployeesAtIndex(idx)
>>
>> According to the book, "[...] these methods will be called  
>> automatically when the NSArrayController wishes ro insert or remove  
>> messages."  However, my functions do not seem to be getting  
>> called.  I have put NSLog statements to see whether they are being  
>> called, but right now it appears not.
>>
>> My project is packaged below.  If you have any idea what I might be  
>> doing wrong, please let me know!
>>
>> eteven
>>
>>
>> <raiseman.zip>
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-----
Brian Marick, independent consultant
Mostly on agile methods with a testing slant
www.exampler.com, www.exampler.com/blog, www.twitter.com/marick