David, I have a working work around, I'm sure it's not the best, but does
work. See code below.
@Persist
private PurchaseRequest prPersist;
private PurchaseRequest pr;
private final String NEW_OBJ = "new";
void onActivate() {
if(prPersist != null) {
for(LineItem _lineItem : prPersist.getLineItems()) {
if(_lineItem.getId() == null ||
!pr.getLineItems().contains(_lineItem)) {
_lineItem.setPurchaseRequest(pr);
pr.getLineItems().add(_lineItem);
}
}
}
prPersist = null;
}
void onValidateFromPR() {
if (form.getHasErrors()) {
prPersist = pr;
}
}
//Modified Geoff's value encoder.
@SuppressWarnings("unchecked")
public ValueEncoder getEncoderLineItem() {
return new ValueEncoder<LineItem>() {
public String toClient(LineItem value) {
Long id = value.getId();
return id == null ? NEW_OBJ : id.toString();
}
public LineItem toValue(String idAsString) {
LineItem lineItem = null;
if (!idAsString.equals(NEW_OBJ)) {
Long id = new Long(idAsString);
lineItem = (LineItem) session.get(LineItem.class, id);
}
// AjaxFormLoop can't handle null obj, so if null we return
a new empty obj.
lineItem = lineItem == null ? new LineItem() : lineItem;
if (!request.isXHR()) {
lineItem.setPurchaseRequest(pr);
pr.getLineItems().add(lineItem);
}
return lineItem;
}
};
}
Hope this helps.
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