public function getVStudentsJoinClassGroup($criteria = null, $con = null)
{
include_once 'lib/model/om/BaseVStudentPeer.php';
if ($criteria === null) {
$criteria = new Criteria();
} elseif ($criteria instanceof Criteria) {
$criteria = clone $criteria;
}
if ($this->collVStudents === null) {
if ($this->isNew()) {
$this->collVStudents = array();
} else {
$criteria->add(VStudentPeer::ACADEMIC_CALENDAR_ID, $this->getId());
$this->collVStudents = VStudentPeer::doSelectJoinClassGroup($criteria, $con);
}
} else {
$criteria->add(VStudentPeer::ACADEMIC_CALENDAR_ID, $this->getId());
if (!isset($this->lastVStudentCriteria) || !$this->lastVStudentCriteria->equals($criteria)) {
$this->collVStudents = VStudentPeer::doSelectJoinClassGroup($criteria, $con);
}
}
$this->lastVStudentCriteria = $criteria;
return $this->collVStudents;
}