def append_item *args
      options = args.extract_options!
      target = args.first
      self.items.create options.slice(:position).merge(:target => target)
    end
def append_item *args
      options = args.extract_options!
      target = args.first
      self.items.create options.slice(:position).merge(:target => target)
    end
display_board.append_item category_1, :position => 2