From: Intransition <transfire@...>
Date: 2010-08-30T07:14:49+09:00
Subject: Re: Broken alias behavior in Ruby 1.9.2?



On Aug 29, 5:25 pm, Tron Fu <t...@soltec.net> wrote:
> The following code works in Ruby 1.8.7 but not in 1.9.2, instead, I get
> the error:
> NoMethodError: undefined method `old_encode64' for Base64:Module
>
> Can someone please shed some light on this.
>
> Thanks in advance,
> Tron
>
> module Base64
>   alias :old_encode64 :encode64
>   module_function # this seems to be necessary -- get a "wrong number of
> arguments (2 for 1)" without it this line.
>
>   def encode64(bin,options={})
>     if (options[:no_line_break] == true)
>       old_encode64(bin).gsub(/\n/, '')
>     else
>       old_encode64(bin)
>     end
>   end
> end

Your alias is only creating an instance method, yet you are using it
as a class method.

To be sure I would need to look at the original code, but presumely

  module Base64
    class << self
      alias :old_encode64 :encode64
    end
  end