/**
* Get the audiences for a given event entity
*
* Returned audience entities are sweetened with the value _link, containing an html-encoded URL
*
* @param object $e event entity
* @return array audience entities
*/
function get_event_audiences($e)
{
$audiences = array();
$es = new entity_selector();
$es->description = 'Selecting audiences for event';
$es->limit_tables();
$es->limit_fields();
$es->enable_multivalue_results();
$es->add_type( id_of('event_type'));
$es->add_relation('entity.id = ' . $e->id());
$es->add_left_relationship_field('event_to_audience', 'entity', 'id', 'aud_ids');
$with_audiences = $es->run_one();
if (!empty($with_audiences))
{
$audiences = array();
$event = reset($with_audiences);
$aud_ids = $event->get_value('aud_ids');
$aud_ids = is_array($aud_ids) ? $aud_ids : array($aud_ids);
foreach( $aud_ids AS $aud_id )
{
$aud = new entity($aud_id);
$aud->set_value('_link', $this->construct_link(array('audience'=>$aud->id(),'no_search'=>'1'), false));
$audiences[$aud_id] = $aud;
}
}
return $audiences;
}
