Rails - Feb 2006 - Auditing mixin for model classes. Small problem

I want to include common auditing functionality in my models.  This 
involves storing the changes made to a model in a seperate table :

I have created the functions in an Audit module :

module Audit
  before_update :before_changes
  after_update :after_changes

  def before_changes
   old=self.class.find(id).attributes
    @changes=[]
    attributes.each do |key, val|
      if val != old[key]
        change = Change.new(:primary_key_id=>id,
                          :table=>self.class.table_name,
                          :attribute=>self.class.human_attribute_name(key),
        :old=>old[key],
        :new=>val)
        @changes << change
      end
    end
  end

  def after_changes
    if(@changes.size>0)
      @changes.each {|change| change.save}
    end
  end
end

I now want to include it like this in my model class :

class Customer < ActiveRecord::Base
  include Audit
  ...
end

But i get the error : "undefined method ''before_update''
for
Audit::Module"

I can change it like this so it works fine:

class Customer < ActiveRecord::Base
  include Audit
  before_update :before_changes
  after_update :after_changes
  ....
end

But this is not an ideal solution.  I''d rather only include the one 
include.
Any ideas???

Thanks,
Chris

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I also want to include

"has_many :changes"

in each model that uses the mixin. I cannot include "has_many
:changes"
in the module.

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On 2/22/06, Chris <evilgeenius@gmail.com> wrote:
> I also want to include
>
> "has_many :changes"
>
> in each model that uses the mixin. I cannot include "has_many
:changes"
> in the module.
I''d highly suggest looking into the various plugins around.  But this
is probably what you''re looking for.

module Audit
  def self.included(base)
    base.before_save ...
    base.has_many :changes
  end
end

http://ruby-doc.org/core/classes/Module.html#M000743

--
Rick Olson
http://techno-weenie.net

Thanks. YOu''re the man.

Have you seen a plugin anywhere that does this?

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The acts_as_versioned plugin is pretty close I imagine.

On 2/22/06, Andy <easy@gmail.com> wrote:
> Thanks. YOu''re the man.
>
> Have you seen a plugin anywhere that does this?
>
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> Posted via http://www.ruby-forum.com/.
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On 2/23/06, Theodore Mills <twmills@gmail.com>
wrote:
> The acts_as_versioned plugin is pretty close I imagine.
It looks like you''re using one table to audit all models.  Acts as
Versioned uses a separate table for each model.  The nice thing is
that each versioned record can also act like the actual method...

--
Rick Olson
http://techno-weenie.net