private static function setCourseUserSelection(&$constraints = array())
{
//"(select count( * ) from users_to_courses uc, users u where uc.courses_ID=c.id and u.archive=0 and u.active=1 and uc.archive=0 and u.login=uc.users_LOGIN and u.user_type='student') as num_students";
if (empty($constraints['table_filters'])) {
return "(select count( * ) from users_to_courses uc, users u where uc.courses_ID=c.id and u.archive=0 and u.active=1 and uc.archive=0 and u.login=uc.users_LOGIN and u.user_type='student') as num_students";
} else {
list($where, $limit, $orderby) = EfrontCourse::convertCourseUserConstraintsToSqlParameters($constraints);
$from = "users_to_courses uc, users u";
$from = EfrontCourse::appendTableFiltersUserConstraints($from, $constraints);
$where[] = "uc.courses_ID=c.id";
$where[] = "u.archive=0";
$where[] = "u.login=uc.users_LOGIN";
$where[] = "u.user_type='student'";
unset($constraints['table_filters']);
// to avoid using the filters again in courses....
return "(select count(*) FROM " . $from . " WHERE " . implode(" AND ", $where) . ") as num_students";
}
}