protected function changeRelationModel()
    {
        $module = getModule(get_called_class());
        $module = explode('-',$module);
        $module = ucfirst_tr($module[1]);
        $this->relations['thumbnails']['relation_model'] = "\\App\\{$module}Thumbnail";
        $this->relations['extras']['relation_model'] = "\\App\\{$module}Extra";
    }