From: Tom Cloyd <tomcloyd@...>
Date: 2009-01-21T11:11:42+09:00
Subject: cannot get attr_accessor to work

I've been staring at this for a couple of hours, and I cannot crack the 
nut. This SHOULD work, but I'm obviously screwing up. Just cannot see 
where. I'm carefully following several examples, but...I cannot get 
access to my instance variables.

Here's a stripped down version of the code -

# SetNet.rb

def main
  # Set up logging
  run_log = Manage_log.new( 'logfile.txt' ).open
  log = run_log.log
  logging_now = run_log.lgg 
    # @logging_now = false
    # @log, @logging_now = manage_log( 'open' )
end

# Creates program log file, setting default logging level of INFO. 
Current logging is appended to existing log content. Closes log when 
requested by user.
  #
  # * _op_ - Requested operation: _open_ or _close
  #
class Manage_log 
  attr_accessor :log, :lgg
  def initialize( logFileName )
    @logFileName = logFileName
  end
  def open 
    #create log file
    log_main = File.open( @logFileName, File::WRONLY | File::APPEND )
    @log = Logger.new( log_main )
    @log.datetime_format = "%Y-%m-%d %H:%M:%S"
    @lgg = true
 
    # set logging level
    @log.level = Logger::INFO # I.e., only INFO level and above will be 
logged
    @log.info( '===== START logging' ) # just a program place indicator
    puts '> logging started, at INFO level'
  end

end

%w(rubygems ruby-debug readline strscan logger fileutils).each{ |lib| 
require lib }
Debugger.start
debugger # call to ruby-debug

main

====

Demonstration of the lack of access -

> $ ruby setnet-x.rb
> setnet-x.rb:40
> main
> (rdb:1) b 4
> Breakpoint 1 file setnet-x.rb, line 4
> (rdb:1) c
> Breakpoint 1 at setnet-x.rb:4
> setnet-x.rb:4
> run_log = Manage_log.new( 'logfile.txt' ).open
> (rdb:1) n
> > logging started, at INFO level
> setnet-x.rb:5
> log = run_log.log
> (rdb:1) p run_log.log
> NoMethodError Exception: undefined method `log' for nil:NilClass
> (rdb:1)
I would truly appreciate someone's pointing out the problem here.

Thanks!

Tom

-- 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tom Cloyd, MS MA, LMHC - Private practice Psychotherapist
Bellingham, Washington, U.S.A: (360) 920-1226
<< tc@tomcloyd.com >> (email)
<< TomCloyd.com >> (website) 
<< sleightmind.wordpress.com >> (mental health weblog)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~