public async Task <IActionResult> ChangeUserData([FromBody] UsersData usersData)
        {
            _log.LogInfo("Get user's userData.");
            if (!ModelState.IsValid)
            {
                _log.LogError("Incorrect input.");
                return(BadRequest(ModelState));
            }

            if (await _appDbContext.ChangeUserData(usersData) == null)
            {
                _log.LogError("Invalid input, null user.");
                return(BadRequest(Errors.AddErrorToModelState("changesFailure", "Invalid input.", ModelState)));
            }

            _log.LogInfo("Change userData.");
            return(Ok());
        }