Trigger cart item
trigger CartItemTrigger on Cart_Item__c (before insert, before update) { // Step 1: Collect all Product Ids from Cart Items Set<Id> productIds = new Set<Id>(); for (Cart_Item__c item : Trigger.new) { if (item.Product__c != null) { productIds.add(item.Product__c); } } // Step 2: Query related Order Line Items Map<Id, Order_Line_Item__c> productToOrderLineItemMap = new Map<Id, Order_Line_Item__c>(); for (Order_Line_Item__c oli : [ SELECT Product__c, ListPrice__c FROM Order_Line_Item__c WHERE Product__c IN :productIds LIMIT 1 ]) { productToOrderLineItemMap.put(oli.Product__c, oli); ...