anurag jain's blog for Salesforce.: February 2016

Hi All,

I am writing this post because 2-3 clients came up with this same requirement, to show all the contacts of child Accounts in their parent Account.

I am explaining this requirement in detail with an example:-
Suppose there is Account "A" who is parent of Account "B".
now account "B" has 2 contacts "B1" and "B2".
client want to see this "B1" & "B2" contacts in parent account "A", so that he can easily know which contact associated with which account on same page easily.
And this is not only limited to 2 level it is goes to up to 100 level (we can't Query more then 100 in one context because of Governor limit).

I solved this problem by creating a VF page and add it to Detail page of Account, So now user can able to see all the contacts associated with the Account and their child Accounts in a same page.

Here the code:-

	<apex:page standardController="Account" extensions="ChildAccountsContactsController">
	<apex:pageblock>
	<apex:pageBlockSection title="All Contacs including child Accounts" columns="1">
	<apex:pageBlockTable value="{!allContactNames}" var="con">
	<apex:column value="{!con.Name}" headerValue="Contact Name"/>
	<apex:column value="{!con.Account.Name}" headerValue="Contact's Account Name"/>
	<apex:column value="{!con.Account.Parent.Name}" headerValue="Contact's Parent Account Name"/>
	</apex:pageBlockTable>
	</apex:pageBlockSection>
	</apex:pageblock>
	</apex:page>

view raw ChildAccountContacts hosted with ❤ by GitHub

	public class ChildAccountsContactsController{

	public List<Contact> allContactNames{get;set;}

	public ChildAccountsContactsController.ChildAccountsContactsController(ApexPages.StandardController controller){
	Id accId = controller.getId();
	Set<Id> allChildAccount = getAllChildAccountIds(accId);

	allContactNames = new List<Contact>();
	allContactNames = [Select Id, Name, Account.Name, Account.Parent.Name from Contact where AccountId in :allChildAccount];
	}

	private Set<Id> getAllChildAccountIds(Id parentAccountId){
	Set<Id> AccountIdSet = new Set<Id>();
	AccountIdSet.add(parentAccountId);
	Boolean check=true;
	do
	{
	List<Account> accIds = [select Id from Account where ParentId in:AccountIdSet And Id not in:AccountIdSet];
	if(accIds != null && accIds.size() > 0){
	for(Integer i=0; i<accIds.size(); i++){
	AccountIdSet.add(accIds[i].Id);
	}
	}
	else
	check = false;
	}while(check);
	return AccountIdSet;
	}
	}