I create a custom attribute last_sync for customer custom attribute, i need to filter it if this attribute is null OR greater than created_at, right now i'm using code like this:

$collections = Mage::getModel('customer/customer')->getCollection()

foreach ($collections as $collection)
  $result = array();
  $result = $collection->getData();
  if(is_null($result['last_sync']) || ($result['last_sync'] < $result['updated_at']))
     $results[] = $result;
return $results;

the problem for the above code is the speed time, because i have to loop through each customer data than filter it

1 Answer 1


You can try

$collections = Mage::getModel('customer/customer')->getCollection()
    ->addFieldToFilter('last_sync', array(
        array('null' => true),
        array('lt' => new Zend_Db_Expr('updated_at'))


$collections = Mage::getModel('customer/customer')->getCollection()

    "(last_sync IS NULL) OR (last_sync < updated_at)"

It will also be faster if you only selected the attributes that you actually want to use.

  • how to combine it with is_null() in OR operator like my if condition in question above? Oct 24, 2017 at 10:16
  • I updated the answer. Haven't tested this though, so it may need tweaking Oct 24, 2017 at 10:27

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