gistfile1.rb

module HasAUMedia
  def self.included(base)
    base.class_eval do
      has_many :attachments, :class_name => 'UserAttachment', :as => :attachable
      has_many :videos, :class_name => 'UserAttachment::Video', :as => :attachable
      has_many :images, :class_name => 'UserAttachment::Image', :as => :attachable
    end
  end
end

class Offergroup < ActiveRecord::Base
  include HasAUMedia
end


 
 
# migration adds a type column and a user_id, updates data based on content_type and former user_id object
# add index on user_id and type
class Media < ActiveRecord::Base
  belongs_to :attachable, :polymorphic => true
  
  validates_presence_of :user_id
end
 
class Media::Video < Media
  # some validation against video related content type
end
 
class Media::Image < Media
  # some validation against video related content type
end
 
class User < ActiveRecord::Base
  include HasAUMedia
end