This is a really good practice when you are using hibernate or ejb3. I
believe in some cases it is even required. If you want to do it lazily then
your getters should look something like this:
Public Address getAddress() {
If (address=null) address=new Address();
Return address;
}
-Igor
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:wicket-user-
> [EMAIL PROTECTED] On Behalf Of Troy MacNeil
> Sent: Tuesday, September 13, 2005 12:14 PM
> To: [email protected]
> Subject: Re: [Wicket-user] Creating Embedded Object via Form
>
> Thanks! protected Address address = new Address() did the trick!
>
> Troy
>
> On Tue, 2005-13-09 at 19:42 +0200, Eelco Hillenius wrote:
> > 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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