/**
* Joins a SrcActivity to it's external reference in a Doctrine Query.
*
* @param AIR2_Query $q
* @param string $alias
*/
public static function joinRelated($q, $alias)
{
$a = $alias ? "{$alias}." : "";
SrcActivity::setupRelated();
$q->leftJoin("{$a}SrcResponseSet WITH {$a}sact_ref_type = ?", self::$REF_TYPE_RESPONSE);
$q->leftJoin("{$a}Tank WITH {$a}sact_ref_type = ?", self::$REF_TYPE_TANK);
$q->leftJoin("{$a}Organization WITH {$a}sact_ref_type = ?", self::$REF_TYPE_ORG);
$q->leftJoin("{$a}Inquiry WITH {$a}sact_ref_type = ?", self::$REF_TYPE_INQUIRY);
$q->leftJoin("{$a}Email WITH {$a}sact_ref_type = ?", self::$REF_TYPE_EMAIL);
}