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https://issues.apache.org/jira/browse/WICKET-3413?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alexander Morozov updated WICKET-3413:
--------------------------------------
Attachment: fix-WICKET-3413.patch
> FLAG_INHERITABLE_MODEL and default model change
> -----------------------------------------------
>
> Key: WICKET-3413
> URL: https://issues.apache.org/jira/browse/WICKET-3413
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.4.15
> Environment: Ubuntu 10.10/md64 JDK 1.6u23 x64
> Reporter: Alexander Morozov
> Attachments: fix-WICKET-3413.patch, test-WICKET-3413.patch
>
>
> The issue is about correctness of Component#setDefaultModel
> (Component#setModelImpl) method behavior. I expect that the flag
> FLAG_INHERITABLE_MODEL should be checked there and turned off in case if new
> model is not a IComponentInheritedModel.
> Let check the next code:
> public MyPanel(String id) {
> super(id);
> ...
> form.setModel(new CompoundPropertyModel(this));
> DropDownChoice ddc = new DropDownChoice("variant", Arrays.ofList(...)) {
> // p1
> @Override
> protected void onInitialize() {
> super.onInitialize();
> setModel(new DefaultingWrapModel(getModel(), Model.of("default
> value")); // p2
> }
> };
> ddc.setNullValid(false);
> ddc.setRequired(true);
> form.add(ddc);
> ...
> }
> In the (p1) the DDC will initialize with CompoundPropertyModel and the
> FLAG_INHERITABLE_MODEL will be turned on soon by the first invocation of
> FormComponent#getModel().
> In the (p2) we wrap the DDC model with the model which provide the default
> value (DefaultingWrapModel implements IWrapModel). So we change the model,
> but the FLAG_INHERITABLE_MODEL is still turned on. On the Component#detach()
> event, the method Component#setModelImpl(null) will be invoked for the ddc
> and the DefaultingWrapModel instance will be lost:
> // reset the model to null when the current model is a
> IWrapModel and
> // the model that created it/wrapped in it is a
> IComponentInheritedModel
> // The model will be created next time.
> if (getFlag(FLAG_INHERITABLE_MODEL))
> {
> setModelImpl(null);
> setFlag(FLAG_INHERITABLE_MODEL, false);
> }
> I think that such behavior is unexpected.
> http://apache-wicket.1842946.n4.nabble.com/1-4-15-FLAG-INHERITABLE-MODEL-and-default-model-change-td3252093.html
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