Models, mixins, and acts_as

Rails
1

I’m having a little trouble with a mixin. Here is the long and short, I
am
using a technique I found here:

http://redcorundum.blogspot.com/2006/06/mixing-in-class-methods.html

To be able to mixin class and instance methods in the same module (works
great btw). I’m using it to make a quick exporter for my models, where
I
can just mixin the module for the models where I need it. Here’s the
brief
version of the code:

Class methods are declared in the “define_class_methods” method

the export function

require ‘mixin_class_methods’

module Exporter

mixin_class_methods { |klass|
}

define_class_methods {

def export_object_name
  self.to_s.downcase.pluralize
end

def export_column_names(columns_to_exclude=nil)
   self.column_names
end

}
end

class Course < ActiveRecord::Base

include Exporter
acts_as_csv_exportable :default, self.export_column_names
end

When I have it setup like this, it runs as expected. However, I want to
DRY
things up and move all the export functionality into the module. If I
comment out the “acts_as_csv_exportable :default,
self.export_column_names” line and move it to the mixin I get an
undefined
method name for “export_column_names”.

Anyone have any ideas how to get around this?