/**
* Constructs a post object and (recursively) all of its children from
* information retrieved from the database.
* @param $posts Array of post ID => fields from DB query
* @param $children Array of post ID => array of child IDs
* @param $id ID of post to construct
* @param $parent Parent post or NULL if none
* @return mod_forumng_post Newly-created post
* @throws mod_forumng_exception If ID is invalid
*/
private function build_posts(&$posts, &$children, $id, $parent)
{
if (!array_key_exists($id, $posts)) {
$msg = "No such post: {$id} (discussion " . $this->get_id() . '); ' . 'posts';
foreach ($posts as $id => $junk) {
$msg .= ' ' . $id;
}
$msg .= '; children';
foreach ($children as $id => $junk) {
$msg .= ' ' . $id;
}
throw new dml_exception($msg);
}
$post = new mod_forumng_post($this, $posts[$id], $parent);
$this->totalsize += strlen($posts[$id]->message);
$post->init_children();
if (array_key_exists($id, $children)) {
foreach ($children[$id] as $childid) {
$post->add_child($this->build_posts($posts, $children, $childid, $post));
}
}
return $post;
}