Re: [Rubycocoa-talk] Can't get Objective-C method signature in Leopard

[Rod S. <rsc...@xm...>]

The OSX module is required.

I have imported the BackpackReminder class.

3) The CSS_class method does not exist on the ObjC side.

One other piece of information is that BackpackReminder descends from  
NSManagedObject. Could CoreData be messing things up? The inheritance  
hierarchy is:

NSManagedObject -> BackpackManagedObject -> BackpackReminder

Rod

On Nov 3, 2007, at 1:07 PM, Laurent Sansonetti wrote:

> On Nov 3, 2007 1:18 PM, Rod Schmidt <rsc...@xm...> wrote:
>> I have the following Ruby code in my RubyCocoa app (in which I have
>> mostly Objective-C with some Ruby).
>>
>> class BackpackReminder
>>        def CSS_class
>>                date = NSDateToRubyDateTime(self.date)
>>                now = DateTime.now
>>                days_from_now = date.jd - now.jd
>>                if days_from_now <= 30 then
>>                        "day#{days_from_now}"
>>                else
>>                        "month#{self.months_from_now}"
>>                end
>>        end
>> end
>>
>> BackpackReminder is an Objective-C class, so I am reopening this  
>> class
>> and adding the CSS_Class method. This worked fine in Tiger. When I  
>> run
>> the app I get the following:
>>
>> 11/3/07 12:55:52 PM PackRat[1109] PageGenerator#generateHTML:
>> OSX::OCMessageSendException: Can't get Objective-C method signature
>> for selector 'CSS:class' of receiver
>> #<OSX::BackpackReminder_BackpackReminder_:0x265a5c
>> class='BackpackReminder' id=0x6115b0>
>> 11/3/07 12:55:52 PM PackRat[1109] Exception raised during posting of
>> notification.  Ignored.  exception: 'Can't get Objective-C method
>> signature for selector 'CSS:class' of receiver
>> #<OSX::BackpackReminder_BackpackReminder_:0x265a5c
>> class='BackpackReminder' id=0x6115b0>'  invoked observer method:  
>> '*** -
>> [PackRatAppDelegate tableViewSelectionDidChange:]'  observer:
>> 0x6f3dd0  notification name:  
>> 'NSTableViewSelectionDidChangeNotification'
>>
>> If I rename the method and remove the underscore and rename it
>> something like CSSClass, I get the same message (with the method name
>> changed of course). Has something changed in the Leopard version of
>> RubyCocoa that prevents you from reopening classes and adding  
>> methods?
>>
>
> No, nothing changed in this logic. However, most of the code that adds
> or overrides methods was ported to the ObjC 2.0 API, and maybe there
> is a regression in that area.
>
> I am nevertheless unable to reproduce this in a quick test.
>
> A few questions:
>
> 1/ Is the OSX module required?
>
> 2/ Does it also happen if you explicitly import the BackpackReminder
> class before doing the override? You can add ''OSX.ns_import :
> BackpackReminder'' at the beginning of the file to try that.
>
> 3/ Does the CSS_class method exists in the ObjC side?
>
> Thanks,
> Laurent
>
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