gistfile1.rb

    @all_items = []
    @all_items.concat Message.all
    @all_items.concat Writeboard.all
    @items = {}
    @all_items.each do |item|
      t = item.created_at
      date = Date.new(t.year, t.month, t.day)
      if @items.has_key? date
        @items[date] << item
      else
        @items[date] = [item]
      end
    end
    @items.each_value do |items|
      items.sort! { |x,y| y.created_at <=> x.created_at }
    end
    @items = @items.sort { |x,y| y <=> x }