class Layout < DesignFile
   
  embedded_in :design


  field :name, :index => true
  references_many :children, :class_name => "Item"
  has_many :layout_parts

  validates_presence_of :name
  validates_format_of :name, :with => /^[0-9a-zA-Z\-_]+$/
  validates_uniqueness_of :name

  def self.exist_one?
    Layout.count > 0
  end
end