From: James Byrne <byrnejb@...>
Date: 2010-11-19T00:21:32+09:00
Subject: Question on scoping

I clearly have either forgotten something important, or I never
understood it correctly, but I cannot sort out what is wrong with the
following:

module AO_Map
 .  .  .
 def ao_map_module_method( y )
   puts( current_batch.to_yaml )
.  .  .
end

class Main
.  .  .
    require  file_dir + "/ao_map"
    include AO_Map
.  .  .
    attr_accessor( :current_batch )
.  .  .
    def execute
  .  .  .
    current_batch = other_class_main_method( x ) # is a hash
    .  .  .
    if current_batch
    begin
      .  .  .
      ao_map_module_method( y )
      .  .  .
end

This construct fails in ao_map_module_method with current_batch being
nil.  Why?  What is it that I am not comprehending about variable scope
in attempting to do this?

I know that I can pass current_batch in as a method parameter to
ao_map_module_method but what is wrong with simply calling an accessor
method from inside another method?  Presumably current_batch and
ao_map_module_method are at the same level inside of class Main.

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