gistfile1.rb

module Refinery
  module PhotoGallery
    module Extensions
      module Pages
        def has_one_page_album
          has_many :album_page, :as => :page, :dependent=> :destroy
          has_many :album, :through => :album_page
          has_many :photos, :class_name => Refinery::PhotoGallery::Photo, :through => :album , :order => "created_at ASC"


          accepts_nested_attributes_for :album_page

          module_eval do
            def photos_for_page(params_page)
              Refinery::PhotoGallery::Photo.where(:album_id => self.album.id).
                                            includes(:album).
                                            paginate(:page => params_page).
                                            order("created_at ASC")
            end


            def album_page=(album_page_params)
              # new
              self.build_album_page if self.album_page.nil?

              # destroy
              if album_page_params[:album_id].blank?
                self.album_page.destroy
                Refinery::Admin::AlbumPageSweeper.sweep
              # create or update if changed
              elsif self.album_page.album_id.to_s != album_page_params[:album_id]
                ap = album_page.find(album_page_params[:album_id]) || album_page.build
                ap.attributes = album_page_params
                ap.save

                Refinery::Admin::AlbumPageSweeper.sweep
              end

            end
          end

          attr_accessible :album_page

        end
      end
    end
  end
end

ActiveRecord::Base.send(:extend, Refinery::PhotoGallery::Extensions::Pages)