public void RemoveFollower(FollowBLL followBll)
        {
            if (followBll == null)
            {
                throw new ArgumentNullException("Object cannot be null");
            }
            var subcribe = _db.Followers.Find(p => p.Id == followBll.Id).Single();

            _db.Followers.Remove(subcribe);
            _db.Save();
        }
        public void AddFollower(FollowBLL followBll)
        {
            if (followBll == null)
            {
                throw new ArgumentNullException("Object cannot be null");
            }

            _db.Followers.Add(new Follow()
            {
                Id       = Guid.NewGuid().ToString(),
                Follower = _db.UserRepository.Find(p => p.Id == followBll.FollowerId).Single(),
                User     = _db.UserRepository.Find(p => p.Id == followBll.UserId).Single()
            });

            _db.Save();
        }