Trigger on contact to update a account custom field

[vijayk3327]

In this post we are going to learn about How to update the FirstName & LastName to the account on custom field contactSummary (Long Text Area) using trigger in Salesforce.

Account Custom Fields & Relationships

Create a custom field on Account name as contactSummary__c (Long Text Area).

Real time scenarios:- Write a trigger on contact and update the FirstName & LastName to the account on custom field contactSummary (Long Text Area) whenever contact record is only updated.

Trigger fired whenever contact record is only updated.

Standard object:- Account >> New custom field:- contactSummary__c (Long Text Area)

👉 To get source code live demo link, Click Here.

Step 1:- Apex Class Trigger : contactTriggerRollSummary.apxt

` TRIGGER contactTriggerRollSummary ON Contact (BEFORE INSERT, after INSERT, BEFORE UPDATE, after UPDATE) {

List<Contact> contactList= NEW List<Contact>();
Set<Id> accountIdSet = NEW Set<Id>(); 

IF(TRIGGER.isBefore){
system.debug('trigger before event');
IF(TRIGGER.isUpdate){
contactList=TRIGGER.new;
}

}ELSE IF(TRIGGER.isAfter){        
    system.debug('trigger after event');   
    IF(TRIGGER.isDelete){
        contactList= TRIGGER.old;
        system.debug('contactListOld ' + contactList);
    }ELSE{
        contactList=TRIGGER.new; 
        system.debug('contactListNew ' + contactList); 
    }          

    FOR(Contact c1:contactList){
        IF(c1.AccountId !=NULL){
            accountIdSet.add(c1.AccountId);
        } 
        IF(TRIGGER.isUpdate){
            Contact oldContact = (Contact)TRIGGER.oldMap.get(c1.Id);                 
            IF(oldContact.AccountId != c1.AccountId){
                accountIdSet.add(oldContact.AccountId);
            }                                

            List<Account> accObjList = NEW List<Account>();
               FOR(Account parentSetObj: [SELECT Id, Name, contactSummary__c, (SELECT Id, FirstName, LastName FROM Contacts) FROM Account WHERE Id IN:accountIdSet])
               {
                   List<Contact> childObj = parentSetObj.Contacts;
                   String conStr = '';
                   FOR(Contact con:childObj){
                       conStr = conStr + con.FirstName + ' ' + con.LastName + '\n';
                   }
                    parentSetObj.contactSummary__c = conStr;
                    accObjList.add(parentSetObj);
                }
                UPDATE accObjList;               

        }             
    }

}
}`

👉 To get source code live demo link, Click Here.