Rails - May 2007 - Add functionality to multiple models?

Hello,

I''m working on a system for managing multiple different items,
let''s say
articles and pictures. All these items can be published and unpublished.
They have a published_at datetime field that is nil in unpublished
state, and filled out in published state.

This is the code that I use in the models:

class SomeModel < ActiveRecord::Base
  attr_protected :published_at

  def published?
    !published_at.nil?
  end

  def pending?
    !published? || Time.now < published_at
  end

  def status
    pending? ? :pending : :published
  end

  def publish
    self.published_at = Time.now if self.pending?
  end

  def unpublish
    self.published_at = nil
  end

end



But, I want to keep it DRY, and I do not want to add these lines to any
model that should be publishable. I tried to create a
publishable_item.rb model class and to inherit from that, but in this
case Rails will look for a publishable_items table.

So I''m looking forward to your suggestions.

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On May 7, 11:35 am, rv dh
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Hello,
>
> I''m working on a system for managing multiple different items,
let''s say
> articles and pictures. All these items can be published and unpublished.
> They have a published_at datetime field that is nil in unpublished
> state, and filled out in published state.
>
> This is the code that I use in the models:
>
> class SomeModel < ActiveRecord::Base
> [..]
> end
>
> But, I want to keep it DRY, and I do not want to add these lines to any
> model that should be publishable. I tried to create a
> publishable_item.rb model class and to inherit from that, but in this
> case Rails will look for a publishable_items table.
Try using a mixin (module).

http://www.rubycentral.com/book/tut_modules.html


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Trochalakis Christos wrote:
> Try using a mixin (module).
> 
> http://www.rubycentral.com/book/tut_modules.html
Thanks, that did it. For anyone interested, the mixin looks like this 
(model must have attribute published_at):

In any model:
  include PublishableSystem
  acts_as_publishable


#lib/publishable_system.rb:
module PublishableSystem
  # an die Klasse anhängen, die diese Erweiterung aufruft
  def self.included(klass)
    klass.extend ClassMethods
  end

  module ClassMethods
    def acts_as_publishable
      include PublishableSystem::InstanceMethods
      attr_protected :published_at
    end
  end

  module InstanceMethods
    def published?
      !published_at.nil?
    end

    def pending?
      !published? || Time.now < published_at
    end

    def status
      pending? ? :pending : :published
    end

    def publish
      self.published_at = Time.now if self.pending?
    end

    def unpublish
      self.published_at = nil
    end
  end
end

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