/**
  * Renvoie les Productions liés aux Batiments de la collection fournie en paramètre
  * @param BatimentCollection $batiments
  * @return ProductionCollection
  */
 public static function getFromBatiments(BatimentCollection $batiments)
 {
     $ids = $batiments->getIdsStr();
     if (!$ids) {
         return new ProductionCollection();
     }
     $req = "SELECT * FROM production WHERE idBatiment IN (" . $ids . ");";
     return DbHandler::collFromQuery($req, 'Production', 'ProductionCollection');
 }