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<?php
/**
* @see https://gitlab.studip.de/studip/studip/-/issues/2441
*/
final class CleanupAdmissionSeminarUser extends Migration
{
public function description()
{
return 'Removes entries from table admission_seminar_user that are '
. 'already in table seminar_user';
}
protected function up()
{
// Fetch affected course ids
$query = "SELECT DISTINCT `seminar_id`
FROM `admission_seminar_user`
JOIN `seminar_user` USING (`seminar_id`, `user_id`)";
$course_ids = DBManager::get()->fetchFirst($query);
// Remove all entries that are already in seminar_user
$query = "DELETE `admission_seminar_user`
FROM `admission_seminar_user`
JOIN `seminar_user` USING (`seminar_id`, `user_id`)";
DBManager::get()->exec($query);
// Adjust positions in admission_seminar_user for all affected courses
foreach ($course_ids as $course_id) {
$query = "SELECT `user_id`
FROM `admission_seminar_user`
WHERE `seminar_id` = ? AND status = 'awaiting'
ORDER BY `position`";
$user_ids = DBManager::get()->fetchFirst($query, [$course_id]);
foreach ($user_ids as $index => $user_id) {
$query = "UPDATE `admission_seminar_user`
SET `position` = ?
WHERE `seminar_id` = ? AND `user_id` = ?";
DBManager::get()->execute($query, [
$index + 1,
$course_id,
$user_id
]);
}
}
}
}