Update

app/models/order.rb

@@ -211,7 +211,7 @@ class Order < ApplicationRecord
         left join dining_facilities on dining_facilities.id = bookings.dining_facility_id
         left join order_items on order_items.order_id = orders.id")
         .where("dining_facilities.type=? and orders.order_type=? and dining_facilities.is_active=?",DiningFacility::TABLE_TYPE,"dine_in",true)
-        .group("orders.id") 
+        .group("orders.id,order_items.id,dining_facilities.name")
   end
    #Origami: Cashier : to view order type Room
   def self.get_order_rooms
@@ -222,7 +222,7 @@ class Order < ApplicationRecord
           left join dining_facilities on dining_facilities.id = bookings.dining_facility_id
           left join order_items on order_items.order_id = orders.id")
           .where("dining_facilities.type=? and orders.order_type=? and dining_facilities.is_active=?",DiningFacility::ROOM_TYPE,"dine_in",true)
-          .group("orders.id")
+          .group("orders.id,order_items.id,dining_facilities.name")
   end
   #Origami: Cashier : to view orders
   def self.get_orders
@@ -233,6 +233,6 @@ class Order < ApplicationRecord
           left join dining_facilities on dining_facilities.id = bookings.dining_facility_id
           left join order_items on order_items.order_id = orders.id")
           .where("dining_facilities.is_active=?",true)
-          .group("orders.id")
+          .group("orders.id,order_items.id,dining_facilities.name")
   end
 end

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