public async Task UpdateRatingAsync(int filmId)
{
var film = _unitOfWork.Films.Get(filmId);
if (film == null)
{
throw new FilmNotExistsException("Film not exists!")
{
FilmId = filmId
}
}
;
film.Rating = _ratingsService.GetFilmsAverageRating(filmId);
_unitOfWork.Films.Update(film);
await _unitOfWork.SaveAsync();
}