public function before_update(Orm\Model $obj)
	{
		// If there are any relations loop through and check if any of them have been changed
		$relation_changed = false;

		foreach ($this->_relations as $relation)
		{
			if ($this->relation_changed($obj, $relation))
			{
				$relation_changed = true;
				break;
			}
		}

		if (($obj->is_changed() or $relation_changed) and $user_id = \Auth::get_user_id())
		{
			$obj->{$this->_property} = $user_id[1];
		}
	}