Re: [Rubycocoa-talk] RubyCocoa and alias_method_chain ?

[Satoshi N. <sna...@in...>]

Hi,

RubyCocoa defines Object.method_missing to realize a transparent =20
bridge between Ruby and Cocoa.  If you redefine method_missing of a =20
class, then=10=10=10=10=10=10 the class won't respond to any ObjC =
methods.  That's =20
why alias_method_chain doesn't work.

--
Satoshi Nakagawa

On 2007/12/09, at 10:47, Marcus Crafter wrote:

> Hi All,
>
> Hope all is going well!
>
> I'm trying to extend method_missing on OSX::CIImage using
> alias_method_chain and are having trouble getting it to work, here's
> an example to demonstrate it:
>
> require 'rubygems'
> require 'active_support'
> require 'osx/cocoa'
>
> module OSX
>   class CIImage
>     def method_missing_with_example(sym, *args, &block)
>       method_missing_without_example(sym, *args, &block)
>     end
>
>     alias_method_chain :method_missing, :example
>   end
> end
>
> original =3D
> OSX::CIImage.imageWithContentsOfURL(OSX::NSURL.fileURLWithPath('/=20
> Users/
> crafterm/Desktop/leaves_desktop.jpg'))
> puts original.extent.size
>
> When I run this I get:
>
> 	NoMethodError: undefined method =91extent=92 for =
#<OSX::CIConcreteImage:
> 0x117248c>
>
> If I comment out the call to alias_method_chain I get the expected
> result:
>
> 	#<OSX::CGSize:0x1173710>
>
> Somehow alias_method_chain breaks it. This is using Ruby & RubyCocoa
> as per a default install of Leopard, Rails 2.0.1 active support gems.
>
> Any thoughts what might be going on or what I could try to get it
> working?
>
> Cheers,
>
> Marcus