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