/**
* @param $obj_id
* @param $source_id
* @param $target_id
* @throws ilException
*/
public static function mergeThreads($obj_id, $source_id, $target_id)
{
// selected source & target objects
$source_thread_obj = new ilForumTopic((int) $source_id);
$target_thread_obj = new ilForumTopic((int) $target_id);
if ($source_thread_obj->getForumId() != $target_thread_obj->getForumId()) {
throw new ilException('not_allowed_to_merge_into_another_forum');
}
// use the "older" thread as target
if ($source_thread_obj->getCreateDate() > $target_thread_obj->getCreateDate()) {
$merge_thread_source = $source_thread_obj;
$merge_thread_target = $target_thread_obj;
} else {
$merge_thread_source = $target_thread_obj;
$merge_thread_target = $source_thread_obj;
}
$thread_subject = $target_thread_obj->getSubject();
// remember if the threads are open or closed and then close both threads !
$targed_was_closed = $merge_thread_target->isClosed();
$merge_thread_source->close();
if ($targed_was_closed == false) {
$merge_thread_target->close();
}
$source_all_posts = $merge_thread_source->getAllPosts();
$source_root_node = $merge_thread_source->getFirstPostNode();
$target_root_node = $merge_thread_target->getFirstPostNode();
$add_difference = $target_root_node->getRgt();
// update target root node rgt
include_once 'Modules/Forum/classes/class.ilForumPostsTree.php';
// $new_target_rgt = ($target_root_node->getRgt() + $source_root_node->getRgt() + 1);
$new_target_rgt = $target_root_node->getRgt() + $source_root_node->getRgt();
ilForumPostsTree::updateTargetRootRgt($target_root_node->getId(), $new_target_rgt);
$new_target_root = $target_root_node->getId();
// get source post tree and update posts tree
foreach ($source_all_posts as $post) {
$post_obj = new ilForumPost($post->pos_pk);
$posts_tree_obj = new ilForumPostsTree();
$posts_tree_obj->setPosFk($post->pos_pk);
if ($post_obj->getParentId() == 0) {
$posts_tree_obj->setParentPos($new_target_root);
//$posts_tree_obj->setRgt(($post_obj->getRgt() + $add_difference));
$posts_tree_obj->setRgt($post_obj->getRgt() + $add_difference - 1);
$posts_tree_obj->setLft($target_root_node->getRgt());
$posts_tree_obj->setDepth($post_obj->getDepth() + 1);
$posts_tree_obj->setSourceThreadId($merge_thread_source->getId());
$posts_tree_obj->setTargetThreadId($merge_thread_target->getId());
$posts_tree_obj->mergeParentPos();
} else {
$posts_tree_obj->setRgt($post_obj->getRgt() + $add_difference - 1);
$posts_tree_obj->setLft($post_obj->getLft() + $add_difference - 1);
$posts_tree_obj->setDepth($post_obj->getDepth() + 1);
$posts_tree_obj->setSourceThreadId($merge_thread_source->getId());
$posts_tree_obj->setParentPos($post_obj->getParentId());
$posts_tree_obj->setTargetThreadId($merge_thread_target->getId());
$posts_tree_obj->merge();
}
}
// update frm_posts pos_thr_fk = target_thr_id
include_once 'Modules/Forum/classes/class.ilForumPost.php';
ilForumPost::mergePosts($merge_thread_source->getId(), $merge_thread_target->getId());
// check notifications
include_once 'Modules/Forum/classes/class.ilForumNotification.php';
ilForumNotification::mergeThreadNotificiations($merge_thread_source->getId(), $merge_thread_target->getId());
// delete frm_thread_access entries
include_once './Modules/Forum/classes/class.ilObjForum.php';
ilObjForum::_deleteAccessEntries($merge_thread_source->getId());
// update frm_user_read
ilObjForum::mergeForumUserRead($merge_thread_source->getId(), $merge_thread_target->getId());
// update visits, thr_num_posts, last_post, subject
$post_date_source = $merge_thread_source->getLastPost()->getCreateDate();
$post_date_target = $merge_thread_target->getLastPost()->getCreateDate();
$target_last_post = $merge_thread_target->getLastPostString();
$exp = explode('#', $target_last_post);
if ($post_date_source > $post_date_target) {
$exp[2] = $merge_thread_source->getLastPost()->getId();
} else {
$exp[2] = $merge_thread_target->getLastPost()->getId();
}
$new_thr_last_post = implode('#', $exp);
$num_posts_source = (int) $merge_thread_source->getNumPosts();
$num_visits_source = (int) $merge_thread_source->getVisits();
$num_posts_target = (int) $merge_thread_target->getNumPosts();
$num_visits_target = (int) $merge_thread_source->getVisits();
$frm_topic_obj = new ilForumTopic(0, false, true);
$frm_topic_obj->setNumPosts($num_posts_source + $num_posts_target);
$frm_topic_obj->setVisits($num_visits_source + $num_visits_target);
$frm_topic_obj->setLastPostString($new_thr_last_post);
$frm_topic_obj->setSubject($thread_subject);
$frm_topic_obj->setId($merge_thread_target->getId());
$frm_topic_obj->updateMergedThread();
// update frm_data: top_last_post , top_num_threads
ilForum::updateLastPostByObjId($obj_id);
// reopen target if was not "closed" before merging
if (!$targed_was_closed) {
$merge_thread_target->reopen();
}
// delete source thread
ilForumTopic::deleteByThreadId($merge_thread_source->getId());
}