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fiona gentryfiona gentry 

How to resolve Trigger handler error void add(Object) from the type Set<Id>

Hi folks,

How to resolve the this error in the  logic of the trigger handler class
  
Method does not exist or incorrect signature: void add(Object) from the type Set<Id>

Here is trigger apex
  

trigger TaskTrigger on Task (before insert) {
    if(Trigger.isBefore&&Trigger.isInsert){
        TaskTriggerHandler.beforeInsert(Trigger.New);
    }    
    
    Map<Id, Task> mapTaskWithRelatedTask = new Map<Id, Task>();
Set<Id> setWhatIds = new Set<Id>();

for (Task objTask : Trigger.New) {
    mapTaskWithRelatedTask.put(objTask.whatId, objTask);
}
for (AggregateResult ar : [SELECT whatId FROM Task WHERE whatId IN: mapTaskWithRelatedTask.keySet() AND Action__c = 'Airtel  contact' GROUP BY whatId]) 
{
    setWhatIds.add(ar.get('whatId'));
}
for (Task objTask : mapTaskWithRelatedTask.values()) {
    if (!setWhatIds.contains(objTask.whatId)) {
        objTask.addError('Please Create a task for airtel account contact Research before creating any other Task');
    }
}
}
Your help is appreciated

Regards

Fiona
 
AnkaiahAnkaiah (Salesforce Developers) 
Hi Fiona,

try with below code. 
trigger TaskTrigger on Task (before insert) {

    
    Map<Id, Task> mapTaskWithRelatedTask = new Map<Id, Task>();
Set<Id> setWhatIds = new Set<Id>();
If(trigger.Isbefore && Trigger.Isinsert){
for (Task objTask : Trigger.New) {
    mapTaskWithRelatedTask.put(objTask.whatId, objTask);
 }
}
for (AggregateResult ar : [SELECT whatId FROM Task WHERE whatId IN: mapTaskWithRelatedTask.keySet() AND Action__c = 'Airtel  contact' GROUP BY whatId]) 
{
    setWhatIds.add(ar.get('whatId'));
}
for (Task objTask : mapTaskWithRelatedTask.values()) {
    if (!setWhatIds.contains(objTask.whatId)) {
        objTask.addError('Please Create a task for airtel account contact Research before creating any other Task');
    }
}
}

If this helps, Please mark it as best answer.

thanks!!
Lukesh KarmoreLukesh Karmore
Hi , fiona gentry 

Map<Id, Task> mapTaskWithRelatedTask = new Map<Id, Task>();   
Set<Id> setWhatIds = new Set<Id>();
you have created above map  , and set  in which you are adding  whatId  of tasks. 
  
 setWhatIds.add(ar.get('whatId')); In these line you  getting Id which return you  the task object itself. So thats the  reason  of error void add(Object) from the type Set<Id>
 Solution : 
Map<Task, Id> mapTaskWithRelatedTask = new Map<Task, Id>();   
If(trigger.Isbefore && Trigger.Isinsert){
for (Task objTask : Trigger.New) {
mapTaskWithRelatedTask.put( objTask,objTask.whatId);
      }
}
for (AggregateResult ar : [SELECT whatId FROM Task WHERE whatId IN: mapTaskWithRelatedTask.values()  AND Action__c = 'Airtel contact' GROUP BY whatId]) {
setWhatIds.add(ar.get(ar));
}

If this helps, Please mark it as best answer.

​​​​​​​Thanks ,
Lukesh
 
fiona gentryfiona gentry
Hi Lukesh,got below errors

Method does not exist or incorrect signature: void get(AggregateResult) from the type AggregateResult
Invalid loop variable type expected Id was Task

Fiona
Lukesh KarmoreLukesh Karmore
Hi  fiona gentry,
Sorry for the late reply, please try below code hope it help you. Please mark best answer if it helps. 
  
trigger TaskTrigger on Task (before insert) {
       
    
    Map<Id, Task> mapTaskWithRelatedTask = new Map<Id, Task>();
Set<Id> setWhatIds = new Set<Id>();

for (Task objTask : Trigger.New) {
    mapTaskWithRelatedTask.put(objTask.whatId, objTask);
}
for (AggregateResult ar : [SELECT whatId FROM Task WHERE whatId IN: mapTaskWithRelatedTask.keySet() and AND Action__c = 'Airtel contact'    GROUP BY whatId]) 
{
    setWhatIds.add(ar.get('whatId').toString()); //I made changes here
}
for (Task objTask : mapTaskWithRelatedTask.values()) {
    if (!setWhatIds.contains(objTask.whatId)) {
        objTask.addError('Please Create a task for airtel account contact Research before creating any other Task');
    }
}
}

Thank,
Lukesh