public async Task<IHttpActionResult> PutExpansion(int id, Expansion expansion)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

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

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

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!ExpansionExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }
        public async Task<IHttpActionResult> PostExpansion(int gameId, Expansion expansion)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }
            var parentGame = db.Games.Find(gameId);
            if(parentGame == null)
            {
                return NotFound();
            }

            parentGame.Expansions.Add(expansion);

            await db.SaveChangesAsync();

            return CreatedAtRoute("NewExpansion", new { id = expansion.Id }, new Models.DTO.Expansion(expansion));
        }