On Tue, 2020-07-14 at 18:44 +0300, Martin Grigorov wrote:
> Hi again,
>
> On Tue, Jul 14, 2020 at 10:46 AM Martin Grigorov <mgrigo...@apache.org>
> wrote:
>
> > Hi,
> >
> > On Tue, Jul 14, 2020 at 10:10 AM Alberto <abros...@inogs.it> wrote:
> >
> > > Hello,
> > >
> > > I have a StringResourceModel in a parent abstract class of all pages.
> > >
> > > IModel<String> titleModel = new StringResourceModel("contentTitle",
> > > getModel());
> > >
> > > where "contentTitle" is a property specified for every child page in
> > > specific
> > > property files and getModel() returns a chain of a CompoundPropertyModel
> > > and a
> > > LoadableDetachableModel.
> > >
> > > If I simple use it, it works:
> > >
> > > add(new Label("pageTitle", titleModel));
> > >
> > >
> > > But if I apply a lambda expression to it (for example):
> > >
> > > add(new Label("pageTitle", titleModel.map(String::trim)));
> > >
> > > I have an exception.:
> > >
> > > java.util.MissingResourceException: Unable to find property:
> > > 'contentTitle'.
> > > Locale: null, style: null
> > >
> > >
> > > Why it happens?
> > >
> >
> > Because .map() returns a new IModel that does not
> > implement IComponentAssignedModel and Wicket cannot find the property in
> > the visible resource bundles.
> > I.e. your properties are in MyPage.properties and Wicket does not look
> > into them because the model does not know the Component it is assigned to.
> > If the property is in MyApplication.properties then it will work, because
> > this is not related to specific Component.
> >
> > Please file a ticket in JIRA. I think this could be improved.
> >
>
> I just took a look at your ticket (
> https://issues.apache.org/jira/browse/WICKET-6801) and it is not exactly as
> I thought it is.
>
> add(new Label("pageTitle", titleModel.map(String::trim)));
>
> at this line titleModel doesn't yet know its component because at the time
> IModel#map() is called titleModel is not yet added as a model to the Label
> and thus IComponentAssignedModel is not yet involved.
> The new IModel returned by .map() does not implement
> IComponentAssignedModel and thus it cannot delegate the
> #wrapOnAssignment(Component) call.
>
> The good news for you is that you can use IModel<String> titleModel = new
> StringResourceModel("contentTitle", *this*, getModel()); to solve your
> problem. By passing 'this' as parameter you tell StringResourceModel to use
> it instead of depending on
> the Component it is added to (the Label in this case).
>
> I'll see what I can do for WICKET-6801!
>
>
Yes, you are right.
I should have read better the documentation. Sorry for that.
Thanks
A
> >
> > >
> > >
> > >
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