public IActionResult AddReviewToBook(int userId, int bookId, [FromBody] ReviewView review)
 {
     if (!ModelState.IsValid)
     {
         return(StatusCode(412, "modelstate is not valid"));
     }
     try {
         var newReview = _reviewsService.AddReviewToBook(userId, bookId, review);
         //FIXME: Create a createdAt path and return that instead.
         return(StatusCode(201));
     } catch (NotFoundException e) {
         return(NotFound(e.Message));
     }
 }