public string LikeIt(UserModel user, int id) { var link = _context.Links.Include(x => x.Likes).FirstOrDefault(x => x.Id == id); var userData = _context.Users.Include(y => y.MyLinks).Include(z => z.LinksILike).FirstOrDefault(x => x.Id == user.Id); string message; if (userData.LinksILike is null) { _likeService.CreateLike(link, user); LikesCounter(link); return(message = "You like this link"); } else if (userData.MyLinks.Contains(link)) { return(message = "This is your link"); } else { var like = _context.Likes.FirstOrDefault(like => like.Link == link & like.User == user); if (like is null) { _likeService.CreateLike(link, user); LikesCounter(link); return(message = "You like this link"); } else { message = _likeService.ChangeStatus(like); LikesCounter(link); return(message); } } }