public Vote CreateVote(Vote vote, long userId, long trackId)
{
var user = context.User.Find(userId);
vote.User = user;
var playlistTrack = context.PlaylistTracks.Find(trackId);
vote = context.Votes.Add(vote);
if (playlistTrack.Votes == null) playlistTrack.Votes = new Collection<Vote>();
playlistTrack.Votes.Add(vote);
context.SaveChanges();
return vote;
}