In the end, (Bound)CompoundPropertyModels are IModels. IModel just has
get/setObject, where you can implement anything you want, including
object creation etc.
CompoundPropertyModels are meant to make your life easier in the sense
that you need less code to acchieve model/property binding. The basis
however, is PropertyModel. WIth PropertyModel you can bind anything
you want, as long as it is a valid two-way Ognl expression.
IModel clientFormModel = new CompoundPropertyModel(myClient);
setModel(clientFormModel);
add(new TextField("address.streetAddress");
is the same as:
BoundCompoundPropertyModel clientFormModel = new
BoundCompoundPropertyModel(myClient);
setModel(clientFormModel);
add(clientFormModel.bind(new TextField("nonImportantName"),
"address.streetAddress"));
is the same as:
add(new TextField("nonImportantName", new PropertyModel(myClient,
"address.streetAddress"));
Now, the problem with your code is that the address is null by
default. Ognl doesn't like that, and will throw an exception. There
are a zillion ways to tackle this, including patching Ognl, patching
PropertyModel, etc, but the simplest way to go here is to make sure
you allways have a non-null address property. Either by declaring that
property like 'protected Address address = new Address;' - your ORM
will overwrite that field when it does have a saved value - or lazily
create an instance in your getter - in which case you must make sure
the getter is not by-passed by any code generation your ORM might do
for you.
I don't think you need the converter; it will work in some cases, and
for some custom object they can be very convenient/ elegant, but in
this case, the fact that your property can be null and Ognl doesn't
try object creation is the real issue.
Eelco
On 9/13/05, Troy MacNeil <[EMAIL PROTECTED]> wrote:
> This is ultimately what I want. The Client object will have a collection
> of addresses, invoices and other objects. The user can view these
> objects and add new ones.
>
> - I can create a form to create a new Client.
>
> - I can create a form to add an address to an existing Client (at least
> I think I can;)
>
> - I can't create a form to create a Client and add an Address at the
> same time. Right now I get bind errors if I add fields that aren't
> properties of the Client object itself.
>
> I suspect the solution lies with the property model. My current code
> references Client directly:
>
> IModel clientFormModel = new CompoundPropertyModel(new Client());
>
> But I don't have a clear enough understanding of how Compound and Bound
> property models work.
>
> Thanks,
> Troy
>
>
> On Tue, 2005-13-09 at 09:15 -0700, Igor Vaynberg wrote:
> > I think a good way to handle this would be to use two pages. First page
> > would show the form for the client object properties along with properties
> > for a single address, the second page would allow the user to add additional
> > addresses to the client object they created in the previous step. Almost
> > like a two page wizard.
> >
> > -Igor
> >
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED] [mailto:wicket-user-
> > > [EMAIL PROTECTED] On Behalf Of Troy MacNeil
> > > Sent: Tuesday, September 13, 2005 8:24 AM
> > > To: [email protected]
> > > Subject: [Wicket-user] Creating Embedded Object via Form
> > >
> > > This isn't the brightest question I've ever asked, I feel I'm missing
> > > very obvious. But I don't see an answer in the examples/wiki so here
> > > goes...
> > >
> > > I'm wondering how to handle. So for instance if I have a Client object
> > > which has one or more Address objects as members, how can I create a new
> > > client using a single form?
> > >
> > > I've looked at the cdapp example where Categories are linked to Albums,
> > > what I want is similar except I'd like to create Categories on the fly
> > > if necessary rather than select from a pre-instantiated list.
> > >
> > > <form wicket:id="form" action="">
> > > Name:
> > > <input type="text" wicket:id="firstName"><br/>
> > > Street Address:
> > > <input type="text" wicket:id="address.streetAddress"><br/>
> > > <input type="submit" value="Add Client"/>
> > > </form>
> > >
> > > @Entity
> > > public class Client implements Comparable<Client> {
> > > protected Long Id;
> > > protected String Name;
> > > protected Address address;
> > >
> > > /*typical getters/setters below */
> > > }
> > >
> > > @Entity
> > > public class Address implements Comparable<Address> {
> > > protected Long Id;
> > > protected String streetAddress;
> > >
> > > /*typical getters/setters below */
> > > }
> > >
> > > Any help or pointers in the right direction greatly appreciated...
> > >
> > > Thanks,
> > > Troy
> > >
> > > Alluvion Development
> > > http://alluvioncorp.com
> > >
> > >
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