From: Ralph Shnelvar <ralphs@...32.com>
Date: 2010-07-15T22:48:45+09:00
Subject: Can't change the value of self

Ok ... I've googled this error and I see stome explanations about usnig destructive methods ...

I don't get it.

Consider

- - - -
class UD_Config
  attr_accessor :container_list
  attr_accessor :screen_x, :screen_y, :screen_width, :screen_height
  
  @@config_filename = 'config.yml'
  
  def initialize
    debugger
    if File.exists? @@config_filename
      config_yaml_str = IO.read(@@config_filename)
      self = YAML::load( config_yaml_str )    # This line seems to be the problem
    else
      set_defaults
    end
  end
  
  
  def write_me
    yaml_obj = YAML::dump( self )
    File.open(filename,"w") { |f| f << yaml_obj }
  end
  
private
  # call this if there is no config file
  def set_defaults
    screen_x, screen_y, screen_width, screen_height = 30, 30, 600, 500
    
    @container_list =
      %w(
        c:\abc\def.udd
        d:\def\ghi.udd
        f:\\ghi\jkl.udd
      )
  end
end

- - - -


I have been taught that "an object should take care of itself" ... what's the right way to do what I want?