getContentAsPDF() after insert a record in the same excution context

Question

I want to insert a record in an object 'Invoice__c', after that I want to create an attachment related to this invoice. This attachment is a visualforce rendered as PDF. I have problems to call createInvoiceAttachment after createInvoice int the same execution context. In different context everything is right. What can i do?

Exectuion

Invoice__c i = Utils.createInvoice('0064E000002Jc91');
Utils.createInvoiceAttachment(i);

Utils class

public class Invoice {

    public static Invoice__c createInvoice(String oppId){
      Invoice__c inv        = new Invoice__c();
      inv.opp__c            = oppId;
      insert inv;
    }


    public static Attachment createInvoiceAttachment(Invoice__c inv){

      PageReference pdf = Page.InvoicePage;
      pdf.getParameters().put('id',inv.id);

      Attachment at     =   new Attachment();
      at.Body           =   pdf.getContentAsPDF();
      at.ParentId       =   inv.Id;
      insert at;
    }

}

Answer 1

The problem is that the modification you are making in the current transaction has not been committed when you make the getContentAsPDF call, as that call is treated as a separate transaction now. This change was delivered as a Critical Update, and that update auto-activated in January 2016. Deactivating that update as Santanu suggests is the pragmatic fix right now, but there may be a time when this change cannot be deactivated.

To fix without requiring the deactivation, you need to move the logic to a point after the transaction commits. One way is to use one of the asynchronous Apex mechanisms such as @future. Another way, if this logic is part of a controller, is to redirect back to an additional method in the controller that does the PDF generation as each controller request is a separate transaction.

Answer 2

After Summer'15 release getContent() and getContentAsPDF() behave as callouts. Refer getContent as callout

According to your requirement, if you do not want to them treated as callouts then update the deactivate the entry from Critical Update section.

From Setup, click Critical Updates.

Click Deactivate for “PageReference getContent() and getContentAsPDF() Methods Treated as Callouts.”