/**
* Called when a post is deleted or undeleted or modified, or there is a
* larger change to the discussion
* @param mod_forumng_post $post Post that has changed; null to always recalculate
*/
function possible_lastpost_change($post = null)
{
$recalculate = false;
if (!$post) {
$recalculate = true;
} else {
if ($post->get_deleted()) {
// For deleted posts, recalculate if this was previously
// considered the latest post
$recalculate = $this->discussionfields->lastpostid == $post->get_id();
} else {
// For other posts, recalculate if this is now newer than the
// stored last post
$recalculate = $post->get_modified() > $this->discussionfields->timemodified;
}
}
// If necessary, recalculate the date
if ($recalculate) {
global $DB;
$change = new stdClass();
$change->id = $this->get_id();
$records = $DB->get_records_sql("SELECT id " . "FROM {forumng_posts} WHERE discussionid = ? AND deleted = 0 AND oldversion = 0 " . "ORDER BY modified DESC", array($this->get_id()), 0, 1);
if (count($records) == 0) {
throw new moodle_exception('errorfindinglastpost', 'forumng');
}
$rec = reset($records);
$change->lastpostid = $rec->id;
if ($change->lastpostid != $this->discussionfields->lastpostid) {
$DB->update_record('forumng_discussions', $change);
}
}
}