gistfile1.txt

class Announcement < ActiveRecord::Base
  has_many :scenes, :as => :scenable
  validates_presence_of :title, :on => :save, :message => "can't be blank"
  validates_presence_of :message, :on => :save, :message => "can't be blank"
  validates_presence_of :expires_on, :on => :save, :message => "can't be blank"
  


class Attachment < ActiveRecord::Base
  has_attachment :storage => :file_system, 
                 :max_size => 1.megabyte,
                 :path_prefix => 'public/scenes'
  has_many :scenes, :as => :scenable     


class Website < ActiveRecord::Base
  has_many :scenes, :as => :scenable
  

class Scene < ActiveRecord::Base
  belongs_to :scenable, :polymorphic => true
  validates_uniqueness_of :position, :on => :save, :message => "must be unique"
end