CITIES:
id_city
city

TRAVEL:
id_travel
id_city_departure
id_city_arrival

How can I make query in that case to get in one row name of departure
city and name of arrival city ? I have tried something like that but
it doesn't work:

$q = Doctrine_Query::create()
->from('Travel trav')
->innerJoin('trav.Cities dep ON dep.id_city = trav.id_city_departure')
->innerJoin('trav.Cities arr ON arr.id_city = trav.id_city_arrival');

return $q->fetchArray();

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