add sale items in sale item model

app/models/sale_item.rb

@@ -11,6 +11,21 @@ class SaleItem < ApplicationRecord
   def compute_item
   end
 
+  # Add Sale Items
+  def self.add_sale_items(sale_items, )
+    sale_items.each do|saleitemObj|
+      saleitemObj.remark = 'foc'
+      saleitemObj.save
+      @newsaleitem = SaleItem.new
+      @newsaleitem = saleitemObj.dup
+      @newsaleitem.save
+      @newsaleitem.qty = saleitemObj.qty * -1
+      @newsaleitem.price = saleitemObj.price * -1
+      @newsaleitem.is_taxable = 1
+      @newsaleitem.product_name = saleitemObj.product_name + ' (FOC)'
+      @newsaleitem.save
+    end    
+  end
 
   def self.get_order_items_details(sale_id)
     order_details = SaleItem.select("sales.total_tax as tax_amount, sales.grand_total as grand_total_amount , sales.total_discount as discount_amount,sales.receipt_date as receipt_date,