public IHttpActionResult PostMenuItem(MenuItem menuItem)
        {
            if (!ModelState.IsValid) {
                return BadRequest(ModelState);
            }

            db.MenuItems.Add(menuItem);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new {
                id = menuItem.Id
            }, menuItem);
        }
        public IHttpActionResult PutMenuItem(int id, MenuItem menuItem)
        {
            if (!ModelState.IsValid) {
                return BadRequest(ModelState);
            }

            if (id != menuItem.Id) {
                return BadRequest();
            }

            db.Entry(menuItem).State = EntityState.Modified;

            try {
                db.SaveChanges();
            } catch (DbUpdateConcurrencyException) {
                if (!MenuItemExists(id)) {
                    return NotFound();
                } else {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }