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