Hey everyone,

I've written an After Insert trigger that looks at the Created By ID and then transfers the record to a different owner. Here are the issues:

-You can't update the same record in an After trigger or else you'll get the "Record is read-only" error
-I can't use a Before trigger, since my trigger is looking at an ID, which doesn't exist yet in a Before trigger

So how would I go about modifying my code to do what I need? I've heard that I need to either "clone the record" or "query anew", but I'm not exactly sure how to use those approaches with my example. 

Please take a look at my trigger and let me know what I should change. (By the way, this trigger also sends an email, as you can see) .

Here is the error when I test it out in the Sandbox:




Here is the trigger (I've bolded the line where the error occurs):

public class ClassLibraryTaskEmail{
    
    public void sendEmail(List<Task> tasks){
        
        Set<String> contactsInTrigger = new Set<String>();
        Map<String,String> contactMap = new Map<String,String>();
        Map<String,String> IDmap = new Map<String,String>();
        List<Task> tasksToTransfer = new List<Task>();
        
        FOR(Task tk : tasks){
            IF(tk.WhoId != NULL && string.valueOf(tk.WhoId).startsWith('003')){
                contactsInTrigger.add(tk.WhoId);
                contactMap.put(tk.Id,tk.WhoId);
            }
        }
        
        List<Contact> validContacts = [SELECT
                                      	Id,AccountId,Account.Assigned_ID__c
                                       FROM
                                      	Contact
                                       WHERE
                                      	Id In: contactsInTrigger];
        
        FOR(Contact c : validContacts){
            IDmap.put(c.Id,c.Account.Assigned_ID__c);
        }
        
        FOR(Task tsk : tasks){
            IF(string.valueOf(tsk.CreatedById).contains('005A0000002rvG0')){
                ID newOwner = IDmap.get(contactMap.get(tsk.Id));
                tsk.OwnerId = newOwner;
                tasksToTransfer.add(tsk);
            }
        }
        
        List<Messaging.SingleEmailMessage> mails = New List<Messaging.SingleEmailMessage>();
        List<String> emails = New List<String>();
        
        List<User> recipients = [SELECT
                                	Id, Email
                                 FROM
                                	User
                                  WHERE
                                	Library_Task_Recipient__c = TRUE];
        
        FOR(User u : recipients){
            IF(u.Email != NULL){
            
            	emails.add(u.Email);
                
            }
            
        }
        
        FOR(Task t : tasks){
            
            IF(emails.size() > 0 && string.valueOf(t.CreatedById).contains('005A0000002rvG0')){
                
                Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
                
                List<String> sendTo = New List<String>();
                
                mail.setToAddresses(emails);
                mail.setReplyTo('greg@offerpop.com');
                mail.setSenderDisplayName('Greg Annunziata');
                
                mail.setSubject('Library Contact Has Filled Out Form');
                String body = 'Greetings director, <br><br>';
                body += 'A contact under a Library account has filled out a form. Please follow up.<br><br>';
                body += 'A link to the task can be found here: https://na7.salesforce.com/'+ t.Id;
                mail.setHtmlBody(body);
                
                mails.add(mail);
                               
            }
            
        }
        
        Messaging.sendEmail(mails);
        UPDATE tasksToTransfer;
        
    }

}

Thanks!
-Greg