// POST api/camera
        public HttpResponseMessage Post(Camera camera)
        {
            if (!ModelState.IsValid) {
                return Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
            }

            camera = _repository.Create(camera);
            var url = Url.Link("DefaultApi", new {controller = "cameras", id = camera.Id});

            var response = Request.CreateResponse(HttpStatusCode.Created, camera);
            response.Headers.Location = new Uri(url);

            return response;
        }
 // PUT api/camera/5
 public void Put(int id, Camera camera)
 {
     Request.CreateErrorResponse(HttpStatusCode.NotImplemented, String.Empty);
 }