Pimcore\Model\Asset\Image\Thumbnail\Config\Listing\Dao::load PHP Method

    public function load()
    {
        $properties = [];
        $propertiesData = $this->db->fetchAll($this->model->getFilter(), $this->model->getOrder());
        foreach ($propertiesData as $propertyData) {
            $properties[] = Config::getByName($propertyData["id"]);
        }
        $this->model->setThumbnails($properties);
        return $properties;
    }