// POST api/post
        public IHttpActionResult Post(PostBindingModel post)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var postedBy = _userRepository.FindById(User.Identity.GetUserId());

            var model = new Post()
            {
                Message = post.Message,
                PostedBy = postedBy.Id,
                PostedOn = DateTime.UtcNow,
                LikedBy = new List<string>(),
                Comments = new List<Comment>()
            };
            model.PostedBy = User.Identity.GetUserId();
            _postRepository.Insert(model);

            var vModel = new PostViewModel
            {
                Id = model.Id,
                Message = post.Message,
                PostedBy = AutoMapper.Mapper.Map<ApplicationUser, ApplicationUserViewModel>(postedBy),
                LikeCount = model.LikeCount,
                LikedBy = new List<ApplicationUserViewModel>(),
                Comments = new List<CommentViewModel>()
            };

            return Ok(vModel);
        }
        // PUT api/post/5
        public IHttpActionResult Put(PostBindingModel post)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var postModel = AutoMapper.Mapper.Map<PostBindingModel, Post>(post);
            var dbPost = _postRepository.FindById(post.Id);

            dbPost.Message = postModel.Message;

            _postRepository.Update(dbPost);

            return Ok();
        }