[Rubycocoa-talk] Odd NSArray behaviour

[Allison N. <dem...@ma...>]

Hi everyone,

I ran into a weird problem today, and I'm not sure if I'm doing  
something wrong, or if it's a bug in RubyCocoa.  Here's the code:

   def test
     ary = NSMutableArray.alloc.init
     (0...100).each{|i| ary << NSObject.alloc.init}
     bad_array = []
     (0...10).each{|i| bad_array << NSObject.alloc.init}
     ary -= bad_array
   end

This always dies with the following

2009-05-01 09:39:04.138 PropertyInvestor[6113:10b]  
MainController#init: OSX::OCException: NSInvalidArgumentException -  
*** -[NSObject copyWithZone:]: unrecognized selector sent to instance  
0x14beef00
	/Library/Frameworks/RubyCocoa.framework/Resources/ruby/osx/objc/ 
oc_wrapper.rb:50:in `ocm_send'
	/Library/Frameworks/RubyCocoa.framework/Resources/ruby/osx/objc/ 
oc_wrapper.rb:50:in `method_missing'
	/Library/Frameworks/RubyCocoa.framework/Resources/ruby/osx/objc/ 
oc_attachments.rb:1328:in `-'
	/Library/Frameworks/RubyCocoa.framework/Resources/ruby/osx/objc/ 
oc_attachments.rb:1328:in `each'
	/Library/Frameworks/RubyCocoa.framework/Resources/ruby/osx/objc/ 
oc_attachments.rb:1328:in `-'
	/Users/demallien/Code/PropertyInvestor/PropertyInvestor/build/Debug/ 
PropertyInvestor.app/Contents/Resources/Database.rb:117:in `test'

Now's where it gets weird.  If I change ary to be a ruby array, making  
the code as follows:

   def test
     ary = NSMutableArray.alloc.init
     (0...100).each{ ary << NSObject.alloc.init}
     ary = [] + ary
     bad_array = []
     (0...10).each{ bad_array << NSObject.alloc.init}
     ary -= bad_array
   end

everything works just fine.  Or if I fill the array with ruby objects  
rather than NSObjects, again, everything works fine, even if the  
enclosing array is an NSArray.

Is this a bug in RubyCocoa? Or have I done something bad that you  
shouldn't do to NSArrays?

Alli