Hi,

I am trying to update orderTrigger on challenge 2, and  I am getting below error:


Please find my trigger and helper class below. Any help would be highly appreciated.

orderTrigger:

/**
 * @name orderTrigger
 * @description
**/
trigger orderTrigger on Order (after update) {
    public Set<Id> orderIds = new Set<Id>();
    if(Trigger.new != null){
    	orderIds = OrderHelper.AfterUpdate(Trigger.new, Trigger.old);    
    }
    
    OrderHelper.RollUpOrderItems(orderIds);
    
}

public with sharing class OrderHelper {

    /**
     * @name AfterUpdate
     * @description 
     * @param List<Order> newList
     * @param List<Order> oldList
     * @return void
    **/
    public static Set<Id> AfterUpdate(List<Order> newList, List<Order> oldList){
        Set<Id> orderIds = new Set<Id>();
        for ( Integer i=0; i<newList.size(); i++ ){
            if ( newList[i].Status == 'Activate' && oldList[i].Status == 'Draft' ){
                orderIds.add(newList[i].Id);
            }
        }
        return orderIds;
    }

    /**
     * @name RollUpOrderItems
     * @description Given a set of Activated Order ids, query the child Order Items and related Products to calculate Inventory levels
     * @param Set<Id> activatedOrderIds
     * @return void
    **/
    public static void RollUpOrderItems(Set<Id> activatedOrderIds){
        Map<Id, Product2> productMap;
        Set<Id> product2Ids = new Set<Id>();
        List<OrderItem> orderItems = [SELECT Id, Quantity, Product2Id FROM OrderItem WHERE OrderId IN:activatedOrderIds];
        for(OrderItem item :orderItems){
            product2Ids.add(item.Product2Id);
        }
        productMap = new Map<Id, Product2>([SELECT Id, Quantity_Ordered__c FROM Product2 WHERE Id IN :product2Ids]);
        for(OrderItem item :orderItems) {
            if(productMap.containsKey(item.Product2Id)) {
                productMap.get(item.product2Id).Quantity_Ordered__c -= item.Quantity;
            }
        }
        update productMap.values();
    }

}