Allow editing of linked deliveries and orders at invoice

app/helpers/finance/invoices_helper.rb

@@ -0,0 +1,8 @@
+module Finance::InvoicesHelper
+  def format_delivery_item delivery
+    format_date(delivery.delivered_on)
+  end
+  def format_order_item order
+    "#{format_date(order.ends)} (#{number_to_currency(order.sum)})"
+  end
+end