@Override
public BillDto update(BillDto d) {
Preconditions.checkArgument(d.getId() != null, "id required");
Bill e = this.getDao().findById(d.getId());
ErrorTypedConditions.checkArgument(e != null, ErrorType.BILL_NOT_FOUND);
this.getDao().saveOrUpdate(e);
return this.getTransformer().transform(e);
}
