@PostMapping("/article/create")
    @PreAuthorize("isAuthenticated()")
    public String createProcess(ArticleBindingModel articleBindingModel) throws IOException {
        UserDetails user = (UserDetails) SecurityContextHolder.getContext()
                .getAuthentication().getPrincipal();

        User userEntity = this.userRepository.findByEmail(user.getUsername());

        Category category = this.categoryRepository.findOne(articleBindingModel.getCategoryId());

        HashSet<Tag> tags = this.findTagsFromString(articleBindingModel.getTagString());

        Article articleEntity = new Article(
                articleBindingModel.getTitle(),
                articleBindingModel.getContent(),
                userEntity,
                category,
                tags
        );

        byte[] articlePictures = articleBindingModel.getMultipartFile().getBytes();
        articleEntity.setArticlePictures(articlePictures);

        this.articleRepository.saveAndFlush(articleEntity);
        return "redirect:/";
    }