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

[Laurent S. <lau...@gm...>]

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