From: 7stud -- <bbxx789_05ss@...>
Date: 2009-09-14T03:34:09+09:00
Subject: Re: module to overwrite method defined via define_method

Can anyone explain this one:

module Redef
  def foo
    puts "'foo' from module"
  end
end

class A
  define_method("foo") do
    puts "'foo' from define_method"
  end

  def initialize
    class << self
      include Redef
    end
  end

  #include Redef

end

p A.ancestors
a = A.new
a.foo

--output:--
[A, Object, Kernel]
'foo' from module

As expected, the version of foo in a's singleton class is found before 
the version of foo in class A in the method lookup before.

But what about here:

module Redef
  def foo
    puts "'foo' from module"
  end
end

class A
  define_method("foo") do
    puts "'foo' from define_method"
  end

  def initialize
    class << self
      include Redef
    end
  end

  include Redef   #<---*****CHANGE HERE

end

p A.ancestors
a = A.new
a.foo


I would expect the order of the look up for the foo method to be:

a's singleton class ==> 'foo from module'
a's class(=A) ==> 'foo from define method'
a's mixins(=Redef) ==> 'foo from module'


But the output is:

[A, Redef, Object, Kernel]
'foo' from define_method





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