/** GET /articles/:id -> get the "id" article. */
 @RequestMapping(
     value = "/articles/{id}",
     method = RequestMethod.GET,
     produces = MediaType.APPLICATION_JSON_VALUE)
 @Timed
 public ResponseEntity<Article> getArticle(@PathVariable Long id) {
   log.debug("REST request to get Article : {}", id);
   Article article = articleRepository.findOne(id);
   if (article != null) {
     article.resolveTraduction();
     if (article.getCategory() != null) article.getCategory().resolveTraduction();
   }
   return Optional.ofNullable(article)
       .map(result -> new ResponseEntity<>(result, HttpStatus.OK))
       .orElse(new ResponseEntity<>(HttpStatus.NOT_FOUND));
 }