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VijayNiVijayNi 

trigger to display Total number of amount and Invoices associated with account and Invoices object

Hi Team,

We have a requirement where two Objects Invoice and account . whenever an account is created  it should update total number of invoices and  amount on  Sum of amount object on account .

Account and Invoice object  are having lookup relationship
Account and Amount are the fileds on Invoices object
 
VijayNiVijayNi
Hii CharuDutt,

I was looking for a programtic approach and the objects are having a lookup relationship

Thanks,
Vijay.
CharuDuttCharuDutt
Hii a.Vijay

trigger NumberOfChild on Contact (After insert,After Update,after delete) {
  set<id> lst = new set <id>();
    if(trigger.isInsert){
        if(trigger.isAfter){
            for(contact lstCon : trigger.new){
               lst.add(lstcon.AccountId); 
            }
        }
    }
     if(trigger.isUpdate){
        if(trigger.isAfter){
            for(contact lstCon : trigger.new){
               lst.add(lstcon.AccountId); 
            }
        }
    }
     if(trigger.isDelete){
        if(trigger.isAfter){
            for(contact lstCon : trigger.old){
               lst.add(lstcon.AccountId); 
            }
        }
    }
     List<Account> listAccs = [Select id,name,Total_Contacts__c ,(Select id from contacts) from Account where Id in :lst];
  for(Account acc :listAccs)
  {
   acc.Total_Contacts__c = acc.contacts.size();
  }
  update listAccs;
}
VijayNiVijayNi
We have a requirement where two Objects Invoice and account .
whenever an account is created  it should update total number ofinvoices and  amount on  Sum of amount object on account .

Account and Invoice object are having lookup relationship
Account and Amount are the fileds on Invoices object

trigger on invoices(after insert,after update,after delete){
if(trigger.isAfter && ((Trigger.isInsert || Trigger.isUpdate || Trigger.isDelete)
{
triggerHandler.updatesum(Trigger.newMap && Trigger.oldMap);
}
}



public class triggerHandler{
public static void updatesum(Map<Id>, <Invoice__c> invoices>{
AggregateResult[] results = [select total_number_of_invoices_c, sum(amount)  FROM Invoice__c WHERE Id IN :invoices.keySet GROUP BY Account__c];
 Set<Account> accountsToUpdate = new Set<Account>();
        for(AggregateResult result:results){
            accountsToUpdate.add(new Account(
                Id = result.get('Account__c'), 
                Account_Balance__c = result.get('expr0');
                 results.total_number_of_invoices_c = result.Invoice.size();
            );
        }
        update accountsToUpdate;
    }
}