private async Task ValidateQuantifiedOfficesAsync(IEnumerable <int> officesIds)
{
foreach (var officeId in officesIds)
{
_bookServiceValidator.CheckIfRequestedOfficesExist(await _officesDbSet.AnyAsync(o => o.Id == officeId));
}
}
private void ValidateQuantifiedOffices(IEnumerable <int> officesIds)
{
officesIds.ForEach(officeId =>
_bookServiceValidator.CheckIfRequestedOfficesExist(_officesDbSet.Any(o => o.Id == officeId)));
}