Igor, thanks for your comments so far.
After a lot of struggle, I now have the following strategy in place which
just provides me with the old results, duplicate data in the database when I
add a template, and then press the back button and add it again.
Here is an example of how I create a new object in wicket (when I need a
transient model). I am trying to understand how wicket gets/sets the
objects. Any pointers?
public class TemplateAddPage extends AuthPage {
public TemplateAddPage() {
setModel(new CompoundPropertyModel(new Template()));
add(new TemplateAddForm("templateaddform"));
}
@Override
public Role[] getAllowedRoles() {
return new Role[] { Role.ADMIN, Role.THERAPIST };
}
private class TemplateAddForm extends Form {
public TemplateAddForm(String id) {
super(id);
add(new RequiredTextField("name"));
add(new RequiredTextField("version"));
add(new RequiredTextField("author"));
add(new TextArea("description"));
add(new TemplateDropDownChoicePanel("ddcpanel"));
}
@Override
public void onSubmit() {
Template template = (Template) getInnermostModel().getObject();
WicketApplication.get().getTemplateFactory().store(template);
setResponsePage(new TemplateListPage());
}
}
}
And here is my base IModel class
public abstract class BaseWebModel<T> implements IModel {
private static final long serialVersionUID = 1L;
protected Long id = null;
protected T object = null;
public abstract Class<T> getBaseClass();
public abstract BaseFactory<T> getFactory();
public BaseWebModel(T object) {
this.id = getFactory().getID(object);
this.object = object;
}
public T getObject() {
if (object == null) {
object = getFactory().getById(id);
if (object == null) {
throw new RuntimeException("Object not found");
}
}
return object;
}
public void setObject(Object object) {
getFactory().store((T) object);
}
public void detach() {
if (object != null) {
if (id != null) {
id = getFactory().getID(object);
object = null;
}
}
}
On Thu, Jan 22, 2009 at 7:58 PM, Igor Vaynberg <[email protected]>wrote:
> when you click the back button you go to a previous version of the
> page (a snapshot as it existed when rendered). in that version the id
> inside the model is still null.
>
> -igor
>
> On Thu, Jan 22, 2009 at 10:48 AM, pieter claassen
> <[email protected]> wrote:
> > Thanks for both responses. I can see what I am supposed to do, what I
> don't
> > understand is what is going wrong.
> >
> > Why when I click on the back button, does the id of my object become
> > invalid? Any pointers in the wicket docs to understand this better?
> >
> > Regards,
> > Pieter
> >
> > BTW> Thanks for a great framework.
> >
> >
> > On Thu, Jan 22, 2009 at 5:44 PM, Igor Vaynberg <[email protected]
> >wrote:
> >
> >> http://wicketinaction.com/2008/09/building-a-smart-entitymodel/
> >>
> >> notice the deatch() implementation
> >>
> >> -igor
> >>
> >> On Thu, Jan 22, 2009 at 8:05 AM, pieter claassen <[email protected]
> >
> >> wrote:
> >> > I am using wicket 1.3.5 and db4o 7.4.63.11890.
> >> >
> >> > My objects are being passed between pages using a subclass of
> >> > LoadableDetachableModel (see below)
> >> >
> >> > My problem is:
> >> > 1. I edit an object on PageA
> >> > 2. I use the back button and then re-submit the form I edited and now
> I
> >> have
> >> > two objects in the database.
> >> >
> >> > Any ideas on why this is happening?
> >> >
> >> > Cheers,
> >> > Pieter
> >> >
> >> >
> >> > package com.musmato.wicket.model;
> >> >
> >> > import org.apache.wicket.model.LoadableDetachableModel;
> >> >
> >> > import com.musmato.dao.BaseFactory;
> >> >
> >> > public abstract class BaseWebModel<T> extends LoadableDetachableModel
> {
> >> >
> >> > private static final long serialVersionUID = 1L;
> >> >
> >> > protected Long id;
> >> >
> >> > public abstract Class<T> getBaseClass();
> >> >
> >> > public abstract BaseFactory<T> getFactory();
> >> >
> >> > public BaseWebModel(Long id) {
> >> > this.id = id;
> >> > }
> >> >
> >> > public BaseWebModel(T object) {
> >> > this.id = getFactory().getID(object);
> >> > }
> >> >
> >> > @Override
> >> > protected Object load() {
> >> >
> >> > if (id == null) {
> >> > return getFactory().getNewObject();
> >> > }
> >> >
> >> > return getFactory().getById(id);
> >> > }
> >> >
> >> > }
> >> >
> >>
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> >>
> >>
> >
>
