Update

app/models/order_item.rb

@@ -37,6 +37,7 @@ class OrderItem < ApplicationRecord
   def self.get_order_items_details(order_id)
     order_details = OrderItem.select("order_items.item_name,order_items.qty,order_items.price,(order_items.qty*order_items.price) as total_price")
          .joins("left join orders on orders.id = order_items.order_id")
-         .where("order_items.order_id=?",order_id)     
+         .where("order_items.order_id=?",order_id)
+          
   end
 end