From: Brian Hartin <brian.hartin@...>
Date: 2009-04-28T07:30:30+09:00
Subject: Why does attr_accessor in module require 'self.'?

Hi there,

When a class mixes in a module containing 'attr_accessor :foo', it must
then use 'self.foo = ...' instead of simply 'foo = ...'.  While I prefer
'self.foo' for clarity's sake, I am stumped as to _why_ this is
required.  For example:

module A
  attr_accessor :a
end

class B
  include A

  def bar
    a = "bar"
  end

  def baz
    self.a = "baz"
  end
end

module A
  attr_accessor :a
end

class B
  include A

  def bar
    a = "bar"
  end

  def baz
    self.a = "baz"
  end
end

irb(main):050:0> b = B.new
=> #<B:0x2db69cc>
irb(main):051:0> b.bar
=> "bar"
irb(main):052:0> b.a
=> nil
irb(main):053:0> b.baz
=> "baz"
irb(main):054:0> b.a
=> "baz"

Does anyone know why this is?

Thanks!

Brian Hartin
-- 
Posted via http://www.ruby-forum.com/.