public PostService(ISocialnetworkDBsettings settings)
        {
            var client   = new MongoClient(settings.ConnectionString);
            var database = client.GetDatabase(settings.DatabaseName);

            _posts = database.GetCollection <Post>("Posts");
        }
        public CommentService(ISocialnetworkDBsettings settings)
        {
            var client   = new MongoClient(settings.ConnectionString);
            var database = client.GetDatabase(settings.DatabaseName);

            _comment = database.GetCollection <Comment>(settings.CommentCollectionName);
        }
        public UserService(ISocialnetworkDBsettings settings)
        {
            var client   = new MongoClient(settings.ConnectionString);
            var database = client.GetDatabase(settings.DatabaseName);

            _users = database.GetCollection <User>(settings.UserCollectionName);
        }