public string UpdateComment(DataCommentModel comment)
 {
     try
     {
         neo4j.UpdateComment(comment.commentid, comment.text);
         return("OK");
     }
     catch (Exception ex)
     {
         return(ex.Message);
     }
 }
        public Comment UploadComment([FromBody] DataCommentModel comment)
        {
            try
            {
                Post post = new Post {
                    id = new Guid(comment.postId)
                };
                User user = new User {
                    username = User.Identity.GetUserName()
                };
                Comment newComment = new Comment {
                    text = comment.text, creator = user, time = DateTime.Now.ToString()
                };

                redis.PushLatestActivity(user.username, "You commented post: " + comment.postId);

                if (neo4j.CreateCommentRelationships(new HasComment
                {
                    comment = newComment,
                    post = post,
                    time = DateTime.Now.ToString()
                }, new Commented
                {
                    comment = newComment,
                    commentator = user,
                    time = DateTime.Now.ToString()
                }))
                {
                    return(newComment);
                }
                else
                {
                    return(null);
                }
            }
            catch (Exception)
            {
                return(null);
            }
        }