I want to do something similar with what this forum is asking, but with more of a list of objects and not a shared field.

I have an object called Call_Report__c and upon save, I want to get its field value called Apps_to_Relate__c which has a string of recordId's of the object Application__c separated by a comma.

I want to update a field of Application__c objects in that string field Apps_to_Relate__c to be the recordId of Apps_to_Relate__c.

How can I go about this? This is the code I have so far:

trigger CallReportTrigger on Call_Report__c (after insert, after update) {
    Map<String, Call_Report__c> objMap = new Map<String, Call_Report__c>();

    for (Call_Report__c callReport : Trigger.new) {
        if (callReport.Custom_Related__c != NULL) {
            objMap.put(callReport.Custom_Related__c, callReport);

    List<Call_Report__c> customObj = [SELECT Custom_Related__c FROM Call_Report__c];
    List<String> finalcustomObj = new List<String>();
    for (Integer i=0; i<customObj.size(); i++) {
         finalcustomObj.add(customObj.get(i).split(',')); // error: split is not a method
    // Custom_Related__c is a long text field, with a String of recordIds separated by commas

If you want to update the Application Object, using the comma separated Id's stored in another object, you should split the comma separate field and set it to a List, which can be iterated to set individual record values.

So the code should be something like this,

List<Application__c> applicationListToUpdate = new List<Application__c>();
Set<String> applicationIdSet = new Set<String>();
for (Call_Report__c callReport : Trigger.new) {
    if (String.isNotBlank(callReport.Custom_Related__c)) {
       for(String applicationId: callReport.Custom_Related__c.split(',')) {
            if(!applicationIdSet.contains(applicationId)) {
                Application__c appObj = new Application__c();
                appObj.Field_To_Update__c = callReport.newValue //Update Application Field Here
                appObj.Id = applicationId //Set Application Id Field Here to be used in Update
update applicationListToUpdate;

Note: I haven't tested this code. But this should help you to get through the logic

  • This works perfectly, thank you
    – Lia
    Jul 7 '21 at 13:27

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