Required to Fill Comment Before Approved/Rejected Using Apex Code



Requirement:  When User Approved or Rejected the approval then it is required to fill Approval 
or Rejected reason

 Solution : You need to write the the trigger on Before Update as mention below
   
private void ApprovedOrRejectedComment(list<Sobject> triggerNew, map<id,Sobject> triggerOldMap)
{

  Map<Id, Sobject> MapIDToObject  = new Map<Id, Sobject>{};
     for(Sobject objSobj: triggerNew)
{

    Sobject oldobjSobj = triggerOldMap.get(objSobj.Id);

 if (((oldobjSobj.Status != 'Approved' 
&& objSobj.Status == 'Approved' )
||(oldobjSobj.Status != 'Rejected' 
&& objSobj.Status == 'Rejected')))
             { 
MapIDToObject.put(objSobj.Id, objSobj);  
}
} 

        if (!MapIDToObject.isEmpty())  
 {


List<Id> processInstanceIds = new List<Id>();

 for (Sobject objSobjs : [SELECT (SELECT ID FROM                                                                                          ProcessInstances
ORDER BY
                                                        CreatedDate DESC
        LIMIT 1)
FROM Sobject
WHERE                                                                                                       ID IN:MapIDToObject.keySet()])
{
  processInstanceIds.add(objSobjs.ProcessInstances[0].Id);
}
for (ProcessInstance pi : [SELECT TargetObjectId,
(SELECT Id, StepStatus, Comments 
         FROM Steps
         ORDER BY CreatedDate DESC
   LIMIT 1 )
FROM ProcessInstance
WHERE Id IN :processInstanceIds
ORDER BY CreatedDate DESC])   
           {                   
if(pi.Steps.size()>0)
        {
     if ((pi.Steps[0].Comments == null
                           || pi.Steps[0].Comments.trim().length() == 0))
{
   MapIDToObject.get(pi.TargetObjectId).addError(
Please Provide a Approved/Rejected Reason. It should not be blank !');
}
}  
}
}

 }
Note: "Approved/Rejected " will work when you added field updated in Final Approval/Final Rejection while creating the Approval process

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