public function hasAttendancesPerSubject() { $c = new Criteria(); $c->add(StudentAttendancePeer::STUDENT_ID, $this->id); $c->add(StudentAttendancePeer::VALUE, 0, Criteria::GREATER_THAN); $c->add(StudentAttendancePeer::COURSE_SUBJECT_ID, null, Criteria::ISNOTNULL); return 0 != count(parent::getStudentAttendances($c)); }