public function owner()
{
if ($this->_owner[0] === false) {
$this->_owner[0] = true;
if ($this->topic !== null) {
$this->_owner[1] = User::find($this->topic->topic_poster);
}
if ($this->_owner[1] === null) {
$this->_owner[1] = $this->user;
}
}
return $this->_owner[1];
}