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34213421 

Duplicate Child Count on Master


I am writing a trigger on a child (M-D relationship) where if the child object had duplicate records, update the count of duplicate on the Master. The duplicate child is determined if there is a lookup field match. The Lookup field here is Itm__c

Here is the code: 
trigger DuplicateInvceLns on Invce_Lne__c (before insert,before update,after insert, After Delete, After Undelete) {

    Set<Id> setInvceIds = new Set<Id>();
    Set<Id> ivtmp = new Set<Id>();
    Map<Id,Invce_Lne__c> inl = new Map<Id,Invce_Lne__c>();


    for(Invce_Lne__c iv : Trigger.new){
        ivtmp.add(Invce__c);
    }

    for(Invce_Lne__c invcelne : [select Id,Name,Itm__c, Invce__c from Invce_Lne__c where Invce__c IN : ivtmp])
        inl.put(invcelne.Itm__c, invcelne);


        for(Invce_Lne__c invcelne : Trigger.new)
        {
            if(invl.containsKey(invcelne.Itm__c)){
                 if(Trigger.isInsert || Trigger.isUndelete){
            setInvceIds.add(invcelne.Invce__c);
            system.debug(invcelne.Invce__c);
            system.debug(setInvceIds);
                 }
        }

           else if(Trigger.isDelete){
           setInvceIds.add(invcelne.Invce__c); 
           system.debug(setInvceIds); 
        }
    }
    List<Invce__c> lstInvce = [Select Id,name, (select id from Invce_Lns__r) from Invce__c where Id IN :setInvceIds];
    for(Invce__c inv : lstInvce)
    {
        inv.Duplicate__c = inv.Invce_lns__r.size();
        system.debug(inv.OrderApi__Invoice_lines__r.size());
    }
    update lstInvce;
}

 
Malni Chandrasekaran 2Malni Chandrasekaran 2
H K,
Am I missing something? you have not mentioned your problem/issue which needs help

from your code,
08    for(Invce_Lne__c iv : Trigger.new){
09        ivtmp.add(Invce__c); // Is not supposed to be iv.Invce__c)
10    }
34213421
Hi Chandrasekaran,

Two issues I had here is when I try deleting any of the child record  It is throwing me an error saying " Attempt to de-reference null object" and the line number is    for(Invce_Lne__c iv : Trigger.new){
09        ivtmp.add(Invce__c);
10    }

The other issue is the duplicate count on the trigger is having the count of all the child records, rather than just the count of duplicate records.