photomix/app/models/collection.rb

class Collection < ActiveRecord::Base
  has_many :collection_albums
  has_many :albums, :through => :collection_albums
  attr_accessor :album_list

  validates :title, :presence => true

  def to_param
     "#{id}-#{title.parameterize}"
  end
  
  def album_list=(albums)
    self.albums = Album.find(albums.map{|album|album[0]})
  end

end