I have a trigger that when I insert data into a custom object create a map with the id of a contact as a key and a list of the custom object as the value, when I check if the key is contained in the map I get true, but when I try to get the value I get (), but when I filled the map I check if the list has items with an if list.size()>0, this is my code:

    for(Id id : Ids){
        Boolean accs = false;
        Boolean cs = false;
        List<npe03__Recurring_Donation__c> rdOld = new List<npe03__Recurring_Donation__c>();
        for(npe03__Recurring_Donation__c rd : rds){
            if(rd.npe03__Organization__c != null && !cs){
                if(id == rd.npe03__Organization__c){
                    accs = true;
            else if(rd.npe03__Contact__c != null && !accs){
                if(id == rd.npe03__Contact__c){
                    cs = true;
            rdsMap.put(id, rdOld);
            accs = false;
            cs = false;

for(npe03__Recurring_Donation__c rdNew : trigger.new){
     if(rdNew.Tipo_de_Compromiso__c == 'Nuevo por Aumento'){
         if(rdNew.npe03__Contact__c != null){
                        List<npe03__Recurring_Donation__c> rdsSort = new List<npe03__Recurring_Donation__c>();
                        List<npe03__Recurring_Donation__c> rdsOld = rdsMap.get(rdNew.npe03__Contact__c).clone();

                        integer targetsize = rdsOld.size();
                        while(rdsSort.size() != targetsize){
                            datetime dt = Datetime.newInstance(1900, 1, 1, 00, 00, 00);
                            integer i = 0;
                            integer mini = 0;
                            for(i = 0; i != rdsOld.size(); i ++){
                                if(rdsOld[i].CreatedDate > dt){
                                    dt = rdsOld[i].CreatedDate;
                                    mini = i;
                        if(rdsSort.size()>0 && rdsSort[0].npe03__Amount__c < rdNew.npe03__Amount__c){

                            rdNew.addError('No puede crear un Compromiso de Donación con el Tipo de Compormiso "Nuevo por Aumento", porque el monto ingresado es menor o igual que el monto del Compromiso de Donación Anterior');
  • I do not think this code will even compile. Seems you are missing some? you start a block with else if
    – Eric
    Sep 1, 2017 at 22:11
  • @Eric you are right i don't put all the code Sep 1, 2017 at 22:22
  • if you do a debug at the end of the first loop (The Id Loop) are there definitely records for the Contact in the map? And where are the rds records in line 5 coming from? Sep 7, 2017 at 17:38
  • Can you explain what you are trying to do in the first for loop? What is Ids, and what kind of Map is rdsMap? Sep 9, 2017 at 2:00
  • the ids for are contact and account ids, the map is map<id, list<npe03__recurring_donation__c>>, I try to get all the recurring donations of a contact or all the recurring donations of an account. Sep 9, 2017 at 14:59

1 Answer 1


You are removing items from the lists that are the values of the map in this line:


and so potentially can empty the lists. (Apex works "by reference" meaning when you get the value from the map you are not getting a copy of the list items but are just getting a pointer to the single copy of the list items so if you change them you change them for all references.)

Perhaps you need to make a copy of the list to avoid that:

... rdsOld = rdsMap.get(rdNew.npe03__Contact__c).clone();

so for each iteration over trigger.new you are using the populated list.

  • Thanks for you replay, but I put system.debug before List<npe03__Recurring_Donation__c> rdsOld = rdsMap.get(rdNew.npe03__Contact__c); to show the list and I only get () Sep 1, 2017 at 22:25
  • @AngelloCamacho Even the first debug output shows that? Strange.
    – Keith C
    Sep 1, 2017 at 23:23
  • yes this is so strange, because I put this if if(rdOld.size()>0){ rdsMap.put(id, rdOld); } but when I do the debug I get () Sep 1, 2017 at 23:46

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