public bool CreatePlaylistSong(PlaylistSongCreate model)
        {
            var entity =
                new PlaylistSong()
            {
                PlaylistOwnerId = _userId,
                SongId          = model.SongId,
                PlaylistId      = model.PlaylistId,
            };

            using (var ctx = new ApplicationDbContext())
            {
                ctx.PlaylistSong.Add(entity);
                return(ctx.SaveChanges() == 1);
            }
        }
        /// <summary>
        /// Assign a song to a playlist
        /// </summary>
        /// <param name="playlist">Pass playlistsong ID</param>
        /// <returns></returns>
        public IHttpActionResult Post(PlaylistSongCreate playlist)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(ModelState));
            }

            var service = CreatePlaylistSongService();

            if (!service.CreatePlaylistSong(playlist))
            {
                return(InternalServerError());
            }

            return(Ok());
        }