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Data Model Questions

Invoice Numbering


2 Posts   267 Views


11 April 2013 at 3:59am (Last edited: 11 April 2013 4:00am), Community Member, 1 Post


I'm trying to populate the invoiceID by adding +1 to the previous number but it won't work. No error message, just a blank page.

Here's my code:

class Invoice extends DataObject {

static $db = array(
      'InvoiceID' => 'Int'

public function populateDefaults() {


      $obj = Invoice::get()->sort('Created', 'ASC')->First();
    $this->InvoiceID = $obj->InvoiceID+1;


Why isn't working?


11 April 2013 at 7:59pm Forum Moderator, 5511 Posts

What happens if there is no invoices in the system? (you should use $this->InvoiceID = ($obj) ? $obj->InvoiceID+1: 1);

Also this way you've implemented will not check for duplicates of anything like that. You could just just the automatic primary $ID key that is defined on every DataObject. Check your php error logs for any other syntax issues that could be causing an issue.