public async Task <IActionResult> CreateMessage(int userId, MessageForCreationDto messageForCreationDto)
        {
            var sender = await _repo.GetUser(userId);

            if (sender.Id != int.Parse(User.FindFirst(ClaimTypes.NameIdentifier).Value))
            {
                return(Unauthorized());
            }

            messageForCreationDto.SenderId = userId;

            var recipient = await _repo.GetUser(messageForCreationDto.RecipientId);

            if (recipient == null)
            {
                return(BadRequest("Could not find user"));
            }

            var message = _mapper.Map <Message>(messageForCreationDto);

            _repo.Add(message);

            if (await _repo.SaveAll())
            {
                var messageToReturn = _mapper.Map <MessageToReturnDto>(message);
                return(CreatedAtRoute("GetMessage", new { userId, id = message.Id }, messageToReturn));
            }

            throw new Exception("Creating the message failed on save");
        }