diff --git a/app/models/sale.rb b/app/models/sale.rb
index d9725e4b..bd7e5668 100644
--- a/app/models/sale.rb
+++ b/app/models/sale.rb
@@ -1,6 +1,6 @@
 class Sale < ApplicationRecord
   self.primary_key = "sale_id"
-  
+
   #primary key - need to be unique generated for multiple shops
   before_create :generate_custom_id
 
@@ -17,6 +17,7 @@ class Sale < ApplicationRecord
   scope :open_invoices, -> { where("sale_status = 'new' and receipt_date BETWEEN '#{DateTime.now.utc.end_of_day}' AND '#{DateTime.now.utc.beginning_of_day}'") }
 
   def generate_invoice_from_booking(booking_id, requested_by)
+    puts "get invoice from booking"
     booking = Booking.find(booking_id)
     status = false
     Rails.logger.debug "Booking -> " + booking.id.to_s
@@ -32,6 +33,7 @@ class Sale < ApplicationRecord
         booking.sale_id = sale_id
       end
         order = booking.booking_orders.take.order
+        puts "add sale order"
         link_order_sale(order.id)
       return status
     end
@@ -68,8 +70,8 @@ class Sale < ApplicationRecord
           add_item(item)
         end
 
-        link_order_sale(order.id) 
-          
+        link_order_sale(order.id)
+
       end
 
 
@@ -226,9 +228,14 @@ class Sale < ApplicationRecord
 
   def link_order_sale(order_id)
     #create if it doesn't exist
-    if (SaleOrder.where("sale_id = #{self.id} and order_id=#{order_id}").nil?)
+    saleOrder = SaleOrder.where("sale_id=? and order_id=?", self.id, order_id).take
+    
+    if saleOrder.nil?
       SaleOrder.create(:sale_id => self.id, :order_id => order_id)
     end
+    # if (SaleOrder.where("sale_id = #{self.id} and order_id=#{order_id}").nil?)
+    #   SaleOrder.create(:sale_id => self.id, :order_id => order_id)
+    # end
     #dosomrting here
     #puts Time.now.format(":short")
   end