Populate child records field value on parent record

 Populate child records field value on parent record by using apex trigger when child   record is inserted.


***

trigger ContactTrigger on Contact (after insert) {

    if(Trigger.isAfter && Trigger.isInsert){

        ContactTriggerHandler.populateNameOnParent(Trigger.new);

    }

}

***

***

// populate child records name on parent field when child record is inserted

    public static void populateNameOnParent(List<Contact> contactList){

        Map<Id,List<Contact>> contactWithAccId = new Map<Id,List<Contact>>();

        Set<Id> accountIds = new Set<Id>();

        List<Account> accountsList = new List<Account>();

        String concatenateString;

        for(Contact cont : contactList){

            if(cont.AccountId != null)

            {

                accountIds.add(cont.AccountId); // get account id from contacts

            }

        }

        // get all contacts related to account ids

        if(accountIds.size() > 0){

            for(Contact cont : [SELECT Id,AccountId,LastName 

                                FROM Contact 

                                WHERE AccountId IN: accountIds])

            {

                if(!contactWithAccId.containsKey(cont.AccountId))

                {

                    contactWithAccId.put(cont.AccountId,new List<Contact>());

                }

                contactWithAccId.get(cont.AccountId).add(cont);

            }

        }

        // get account records

        if(accountIds.size() > 0){

            for(Account acct : [SELECT Id,Contact_Names__c 

                                FROM Account WHERE Id IN: accountIds])

            {

                concatenateString = '';

                // populate all contact last name on parent record field

                if(contactWithAccId.containsKey(acct.Id) && contactWithAccId.get(acct.Id).size() > 0)

                {

                    for(Contact cont : contactWithAccId.get(acct.Id))

                    {

                        if(!concatenateString.contains(cont.LastName))

                        {

                            concatenateString = concatenateString + cont.LastName + ',';

                        }

                    }

                    concatenateString = concatenateString.removeEnd(',');

                    acct.Contact_Names__c = concatenateString;

                }else{

                    acct.Contact_Names__c = null;

                }   

                accountsList.add(acct);

            }

        }

        try{

            if(accountsList.size() > 0){

                UPDATE accountsList;

            }

        }catch(Exception ex){

            System.debug('exception^^' + ex.getMessage());

        }

    }

***

Note:

We can also remove any record name when that record is deleted. We have to pass Trigger.old list in method parameter.

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