update order and request bill

app/models/booking.rb

@@ -8,7 +8,53 @@ class Booking < ApplicationRecord
   belongs_to :sale, :optional => true
   has_many :booking_orders
   has_many :orders, :through => :booking_orders
-  has_many :order_items, :through => :orders
+  has_many :order_items, :through => :orders do
+    def to_sale_items
+      sale_items = []
+      proxy_association.load_target.select(&:order_items_id).each do |order_item|
+        menu_category = order_item.menu_category || OpenStruct.new(name: 'Product', code: '') #get menu category for menu items
+        
+        sale_items << SaleItem.new({
+            menu_category_name: menu_category.name,
+            menu_category_code: menu_category.code,
+            product_name:       order_item.item_name,
+            product_code:       order_item.item_code,
+            product_alt_name:   order_item.alt_name,
+            account_id:         order_item.account_id,
+            is_taxable:         order_item.taxable,
+            item_instance_code: order_item.item_instance_code,
+            qty:                order_item.qty,
+            unit_price:         order_item.price,
+            price:              order_item.qty * order_item.price,
+            taxable_price:      order_item.qty * order_item.price,
+            status:             order_item.remark
+        })
+
+        if order_item.set_menu_items
+          JSON.parse(order_item.set_menu_items).each do |item|
+            instance  = MenuItemInstance.find_by_item_instance_code(item["item_instance_code"])
+            menu_item = instance.menu_item
+            menu_category = menu_item.menu_category #get menu category for menu items
+            sale_items << SaleItem.new({
+              menu_category_name: menu_category.name,
+              menu_category_code: menu_category.code,
+              product_name:       instance.item_instance_name,
+              product_code:       menu_item.item_code,
+              product_alt_name:   menu_item.alt_name,
+              account_id:         menu_item.account_id,
+              is_taxable:         menu_item.taxable,
+              item_instance_code: item["item_instance_code"],
+              qty:                item["quantity"],
+              unit_price:         item["price"],
+              price:              item["quantity"].to_f * item["price"].to_f,
+              taxable_price:      item["quantity"].to_f * item["price"].to_f
+            })
+          end
+        end
+      end
+      sale_items
+    end
+  end
 
   scope :active, -> {where("booking_status != 'moved'")}
   scope :today, -> {where("created_at >= #{Time.now.utc}")}