From: Sylvain Viart Date: 2011-07-18T17:15:55+09:00 Subject: [ruby-core:38162] [Ruby 1.9 - Bug #4994] DelegateClass don't find extern global public method in 1.9.2 Issue #4994 has been updated by Sylvain Viart. Sorry, but links are in Japanese. I can read the code, but not why the DelegateClass shouldn't search the global public method, any more? Could you translate or post a link to an English doc? For the correction you suggest, I've wrote this code: I don't like this usage as a Delegation. May be I missed something.

require 'delegate'
require 'pp'

def test_that?(str)
    str.size > 0
end

class String2 < DelegateClass(String)
    def initialize(*param)
        @s = String.new(*param)
        super(@s)
    end

    def dummy
        test_that?(@s)
        bla()
    end

    def method_missing(m, *args, &block)
        begin
            Object.send(m, *args, &block)
        rescue NameError =>e
            # doesn't work with NoMethodError, it loops
            raise "no method found: '#{m}'"
        end
    end
end

s2 = String2.new("pipo")

# test Delegated method
pp s2.size

# call with method_missing()
pp s2.dummy

output (ruby -v ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux])

:!ruby draft/tdelegate.rb
4
draft/tdelegate.rb:24:in `rescue in method_missing': no method found: 'bla' (RuntimeError)
        from draft/tdelegate.rb:20:in `method_missing'
        from draft/tdelegate.rb:16:in `dummy'
        from draft/tdelegate.rb:32:in `'

---------------------------------------- Bug #4994: DelegateClass don't find extern global public method in 1.9.2 http://redmine.ruby-lang.org/issues/4994 Author: Sylvain Viart Status: Rejected Priority: Normal Assignee: Category: lib Target version: 1.9.2 ruby -v: ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux] How to reproduce:

require 'delegate'
require 'pp'

def test_that?(str)
    str.size > 0
end

class String2 < DelegateClass(String)
    def initialize(*param)
        @s = String.new(*param)
        super(@s)
    end

    def dummy
        test_that?(@s)
    end
end

s2 = String2.new("pipo")

pp s2.dummy

The code above works under 1.9.1 and 1.8 but not under 1.9.2 * ruby1.9.1 -v => ruby 1.9.1p378 (2010-01-10 revision 26273) [x86_64-linux] * ruby1.8 -v => ruby 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux] * ruby -v => ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux] error message:

!ruby draft/tdelegate.rb
draft/tdelegate.rb:15:in `dummy': undefined method `test_that?' for "pipo":String2 (NoMethodError)
        from draft/tdelegate.rb:21:in `'

shell returned 1

-- http://redmine.ruby-lang.org