From: ts <decoux@...>
Date: 2006-05-18T18:12:11+09:00
Subject: Re: alias_method

>>>>> "B" == =?GB2312?B?wfXDz72t?=  <GB2312> writes:

B> ./lib/activerecord/extension.rb:18:in `alias_method': undefined method
B> `establis
B> h_connection' for class `ActiveRecord::Base' (NameError), but the
B> ActiveRecord:Base.respond_to(:establis
B> h_connection) is true.

 You want probably alias with instance_eval

moulon% cat b.rb
#!/usr/bin/ruby
module A
   class B
      def self.b
      end
   end
end

def included(klass)
   klass.instance_eval do
      alias c b
   end
   p "instance_eval : #{klass.respond_to?(:c)}"

   begin
      klass.class_eval do
         alias d b
      end
   rescue
      p "class_eval : #{$!}"
   end
end

p "A::B : #{A::B.respond_to?(:b)}"
included(A::B)
moulon%
 
moulon% ./b.rb
"A::B : true"
"instance_eval : true"
"class_eval : undefined method `b' for class `A::B'"
moulon% 




Guy Decoux