Bulkify Trigger Example
Trigger : Update Account Total_Amount field by sum of all its Contact Money field (Roll up summary trigger) For this following steps as follow: 1. Create custom field Create a custom field on Account named : Total Money Create a custom field on Contact named : Money 2. Create a Apex Class (Handler class for Trigger) named : AccountTotalMoneyHandler public class AccountTotalMoneyHandler{ public static void onAfterInsert(List<Contact> lstNewContacts){ Set<Id> setAccountIds= new Set<Id>(); for(Contact con : lstNewContacts){ if(con.AccountId != NULL){ setAccountIds.add(con.AccountId); } } if(setAccountIds.size() > 0){ populateMoneyOnAccount(setAccountIds); } } public static void onAfterUpdate(List<Contact> lstNewContacts,Map<Id,Contact> mapOldContact){ Set<Id> setAccountIds= new Set<