public function prepareUpdateData($document)
{
$oid = spl_object_hash($document);
$changeset = $this->_uow->getDocumentChangeSet($document);
$result = array();
foreach ($this->_class->fieldMappings as $mapping) {
$old = isset($changeset[$mapping['fieldName']][0]) ? $changeset[$mapping['fieldName']][0] : null;
$new = isset($changeset[$mapping['fieldName']][1]) ? $changeset[$mapping['fieldName']][1] : null;
$new = $this->_prepareValue($mapping, $new);
$old = $this->_prepareValue($mapping, $old);
if ($mapping['type'] === 'many' || $mapping['type'] === 'collection') {
$this->_addArrayUpdateAtomicOperator($mapping, (array) $new, (array) $old, $result);
} else {
$this->_addFieldUpdateAtomicOperator($mapping, $new, $old, $result);
}
}
return $result;
}