public static function findByText($text)
 {
     self::fetchRemoteSearch($text);
     $statement = DBManager::get()->prepare("\n            SELECT lernmarktplatz_material.*\n            FROM lernmarktplatz_material\n                LEFT JOIN lernmarktplatz_tags_material USING (material_id)\n                LEFT JOIN lernmarktplatz_tags USING (tag_hash)\n            WHERE lernmarktplatz_material.name LIKE :text\n                OR description LIKE :text\n                OR short_description LIKE :text\n                OR lernmarktplatz_tags.name LIKE :text\n            GROUP BY lernmarktplatz_material.material_id\n            ORDER BY lernmarktplatz_material.mkdate DESC\n        ");
     $statement->execute(array('text' => "%" . $text . "%"));
     $material_data = $statement->fetchAll(PDO::FETCH_ASSOC);
     $materials = array();
     foreach ($material_data as $data) {
         $materials[] = LernmarktplatzMaterial::buildExisting($data);
     }
     return $materials;
 }