public IEnumerable <Topic> Get(bool includeReplies = false)
        {
            IQueryable <Topic> results;

            if (includeReplies)
            {
                results = _repo.GetTopicsWithReplies();
            }
            else
            {
                results = _repo.GetTopics();
            }

            var topics = results
                         .OrderByDescending(t => t.Created)
                         .Take(25)
                         .ToList();

            return(topics);
        }