public function isDuplicated(ISummit $summit) { $start_date = $summit->getBeginDate(); $end_date = $summit->getEndDate(); $dupe = Summit::get_one("Summit", "Name = '" . $summit->getName() . "' AND SummitBeginDate = '" . $start_date . "' AND SummitEndDate = '" . $end_date . "'"); return !empty($dupe); }