private async Task <Option <Domain.Entities.Restaurant, Error> > RestaurantWithCurrentNameAndTownShouldNotExist(
string name,
string townId)
{
var result = await RestaurantRepository
.GetByNameAndTownIdAsync(name, townId);
return(result
.SomeWhen(r => r == null, Error.Conflict($"Restaurant `{name}` already exists."))
.Map(_ => new Domain.Entities.Restaurant()));
}
