public static Mapping From(IViewModel view)
{
var mapping = new Mapping();
if (!String.IsNullOrEmpty(view.MusicBrainz))
mapping.MusicBrainz = new MusicBrainzId(view.MusicBrainz);
if(!String.IsNullOrEmpty(view.SevenDigital))
mapping.SevenDigital = new SevenDigitalId(int.Parse(view.SevenDigital));
return mapping;
}