$ ruby yaml-to-order.rb
#<Order:0x007ff8a415b4f0 @order_number="ABC123", @order_date=#<Date: 2016-03-23 ((2457471j,0s,0n),+0s,2299161j)>, @customer=#<Customer:0x007ff8a415a960 @name="John Papas", @address="Independence Day 5th, 11511">, @order_details=[#<OrderItem:0x007ff8a4159998 @id=1, @item="Of Mice And Men", @item_type="Book", @price=10, @currency="Euro">, #<OrderItem:0x007ff8a4158a70 @id=2, @item="Les Miserables", @item_type="Book", @price=12, @currency="Euro">, #<OrderItem:0x007ff8a4158250 @id=3, @item="Game Of Thrones", @item_type="DVD", @price=50, @currency="Euro">, #<OrderItem:0x007ff8a585f598 @id=4, @item="Samsung Galaxy", @item_type="Mobile Phone", @price=200, @currency="Euro">]>
$