public async Task <ActionResult> PutCheckin(int id)
        {
            var user = await GetCurrentUserAsync();

            var dbActivity = _allReadyDataAccess.GetActivity(id);

            if (dbActivity == null || dbActivity.UsersSignedUp == null)
            {
                return(this.HttpNotFound());
            }

            var userSignup = dbActivity.UsersSignedUp.FirstOrDefault(u => u.User.Id == user.Id);

            if (userSignup != null && userSignup.CheckinDateTime == null)
            {
                userSignup.CheckinDateTime = DateTime.UtcNow;
                _allReadyDataAccess.AddActivitySignup(userSignup);
                return(Json(new { Activity = new { Name = dbActivity.Name, Description = dbActivity.Description } }));
            }
            else
            {
                return(Json(new { NeedsSignup = true, Activity = new { Name = dbActivity.Name, Description = dbActivity.Description } }));
            }
        }