public HttpResponseMessage Put(HttpRequestMessage request, PostTagViewModel postTagVm) { return(CreateHttpResponse(request, () => { HttpResponseMessage response = null; if (!ModelState.IsValid) { request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState); } else { var postTagDb = _postTagService.GetByID(postTagVm.PostID, postTagVm.TagID); postTagDb.UpdatePostTag(postTagVm); _postTagService.Update(postTagDb); _postTagService.SaveChanges(); response = request.CreateResponse(HttpStatusCode.OK); } return response; })); }