protected function buildCriteria()
{
if (is_null($this->filters)) {
$this->filters = $this->configuration->getFilterForm($this->getFilters());
}
$criteria = $this->filters->buildCriteria($this->getFilters());
$event = $this->dispatcher->filter(new sfEvent($this, 'admin.build_criteria'), $criteria);
$criteria = $event->getReturnValue();
$deserter_students = StudentPeer::getDeserterStudents();
$ids = array();
foreach ($deserter_students as $student) {
$ids[] = $student->getId();
}
$criteria->add(StudentPeer::ID, $ids, Criteria::IN);
$total_criteria_desertores = count(StudentPeer::doSelect($criteria));
$total_alumnos = count(StudentPeer::doSelect(new Criteria()));
$this->getUser()->setAttribute('students_count', $total_criteria_desertores);
$this->getUser()->setAttribute('students_percentaje', $total_criteria_desertores * 100 / $total_alumnos);
return $criteria;
}