public IHttpActionResult Post(int id)
        {
            var article = this.data.Articles.Find(id);
            if (article == null)
            {
                return BadRequest("Article with such id does not exist!");
            }

            var userID = this.User.Identity.GetUserId();

            var like = this.data.Likes.All().FirstOrDefault(x => x.ArticleId == id && x.AuthorId == userID);
            if (like != null)
            {
                return BadRequest("This user has already liked this article!");
            }

            like = new Like
            {
                ArticleId = article.Id,
                AuthorId = userID,
            };

            this.data.Likes.Add(like);
            this.data.SaveChanges();

            return Ok();
        }
        public IHttpActionResult LikeArticle(int id)
        {
            var article = this.data.Articles.Find(id);
            if (article==null)
            {
                return this.BadRequest("No such article exists!");
            }

            if (article.Likes.Any(x=>x.AuthorId==User.Identity.GetUserId()))
            {
                return this.BadRequest("That user already liked that!");
            }

            var like = new Like() { AuthorId = User.Identity.GetUserId() };
            article.Likes.Add(like);
            this.data.SaveChanges();
            var model = new LikeModel(like);
            return this.Ok(model);
        }
 public LikeModel(Like like)
 {
     this.Article = like.Article.Title;
     this.Author = like.AuthorId;
     this.Id = like.Id;
 }