update other charge add to recipt bill and close pdf

app/models/sale_item.rb

@@ -150,6 +150,19 @@ class SaleItem < ApplicationRecord
     return price,type
   end
 
+   # Get Prices for each accounts (eg: food, beverage)
+  def self.calculate_other_charges(sale_items)
+    total = 0
+      # Check for actual sale items
+      sale_items.each do |si|
+        if si.product_code == "Other Charges" && si.item_instance_code == nil          
+          total = total + si.price
+        end
+      end
+
+    return total
+  end
+
   # def self.get_overall_discount(sale_id)
   #   price = 0.0
   #   item=SaleItem.where("product_code=?", sale_id)