public function savePaper(Paper $publication, $path)
 {
     $jsonResponse = new JsonResponse();
     if ($publication->saveFile($path)) {
         $statement = "INSERT INTO paper (title, filename, theme, date, year, publication_type) \r\n                            VALUES (:title, :filename, :subarea, :date, :year, :publication_type)";
         $query = $this->session->prepare($statement);
         $query->bindParam(":title", $publication->title());
         $query->bindParam(":filename", $publication->getFilename());
         $query->bindParam(":subarea", $publication->getSubareaId());
         $query->bindParam(":date", $publication->date());
         $query->bindParam(":year", $publication->getYear());
         $query->bindParam(":publication_type", $publication->getTypeId());
         try {
             $query->execute();
         } catch (PDOException $err) {
             throw new PDOException($err->getMessage());
         }
     } else {
         throw new Exception("Falha ao salvar cópia do arquivo no diretório: {$path}");
     }
 }