/**
* Convert the given scalar DAO to an array and prepend metadata.
*
* @param Tracker_ScalarDao $scalarDao scalar DAO
* @return array associative array representation of the scalar DAO with metadata prepended
*/
protected function _toArray($scalarDao)
{
$scalarArray = array('_id' => $scalarDao->getKey(), '_type' => 'Tracker_Scalar');
return array_merge($scalarArray, $scalarDao->toArray());
}
