Feature Request - Add "Sort by Random" into "Finder"

[egloffmark]

When you use the content finder i.e. for joomla articles, it is currently only possible to sort by article attributes, but you can not sort it by random. See http://docs.gantry.org/gantry5/advanced/content-in-particles#orderby-direction-asc-alias-a-pagination-order. The current implementation quite hard-coded so it would be good if you can pass a function or offer a random function.

in Twig

set article_finder = joomla.finder('content', article_options).published(1).language()
set articles = article_finder.order(sort.orderby, sort.ordering).limit(limit.total).start(limit.start).find()

Current "order()" Implementation, at "/libraries/gantry5/classes/Gantry/Joomla/Object/Finder.php"

    public function order($by, $direction = 1, $alias = 'a')
    {
        if (is_numeric($direction)) {
            $direction = $direction > 0 ? 'ASC' : 'DESC';
        } else {
            $direction = strtolower((string)$direction) == 'desc' ? 'DESC' : 'ASC';
        }
        $by = (string)$alias . '.' . $this->db->quoteName($by);
        $this->query->order("{$by} {$direction}");

        return $this;
    }