private ICollection <Genre> GetGenresFromIds(ICollection <int> genreIds)
{
var pipeline = new Pipeline <Genre>();
pipeline.Register(_filterFactory.MakeGenresForIdsFilter(genreIds));
List <Genre> results = UnitOfWork.Genres.Find(pipeline).ToList();
if (results.Count != genreIds.Count)
{
throw new EntityNotFoundException(typeof(Genre));
}
return(results);
}