update workflow

app/models/list.rb

@@ -12,7 +12,7 @@ class List
   validates :table_id, presence: true
 
   def close!
-    #TODO: close orders
+    orders.map(&:close!)
     self.state = 'closed'
     self.closed_at = Time.now
     save

app/models/order.rb

@@ -1,7 +1,7 @@
 class Order
   include SimplyStored::Couch
 
-  property :state, default: 'placed' # placed, active, delivered, cancelled
+  property :state, default: 'placed' # placed, active, delivered, cancelled, closed
 
   belongs_to :list
   belongs_to :user
@@ -42,4 +42,9 @@ class Order
     self.state = 'delivered'
     save
   end
+
+  def close!
+    self.state = 'closed' if placed? || active?
+    save
+  end
 end