promotion issue second item

app/models/promotion.rb

@@ -426,14 +426,30 @@ class Promotion < ApplicationRecord
   end
 
  def self.find_second_item_qty(sale_id, promo_item)
+  array_same =[]
    saleObj = Sale.find_by_sale_id(sale_id)
-   itemList = combine_item(saleObj)
-   itemList.each do |item|
-     item.each do |i|
-        if i[0][0] == promo_item.downcase
-           return i[1]
+    itemList = combine_item(saleObj)
+    itemList.each do|list|
+      list.each do |l|
+        array_same.push({
+                item_instance_code: l.item_instance_code,
+                order_id:l.order_id,
+                qty:l.qty     
+          })
+      end
+    end
+    item_list =[]
+    array_same.group_by do |same|
+      same.values_at :item_instance_code
+    end.map do |(item_instance_code), array_same|
+      quantities = array_same.map { |p| p[:qty] }
+      qty = quantities.all? ? quantities.reduce(:+) : nil
+      item_list.push({ item_instance_code: item_instance_code, qty: qty })
+    end
+   item_list.each do |item|
+        if item[:item_instance_code] == promo_item.downcase
+           return item[:qty].to_i
         end
-     end
    end
    return 0
  end