public function published()
    {
        $class = $this->entity->published ? 'fa fa-check-circle-o' : 'fa fa-circle-o';
        $state = $this->entity->published ? 'Published' : 'Unpublished';

        return html()->tag('i', '', ["class" => $class, "data-toggle" => "tooltip", "data-title" => $state]);
    }