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https://issues.apache.org/jira/browse/WICKET-1331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12567814#action_12567814
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Sergiy Yevtushenko commented on WICKET-1331:
--------------------------------------------
I'm in situation when model object contains values convenient for processing
and storing, while user should see more verbose, human readable choice items.
Also, I'm about to implement another similar case - model object contains
numbers from predefined set of non-sequential values while for user they are
presented as descriptive text strings. In all these situations it is convenient
to let DropDownChoice maintain and automatically handle conversion, especially
if to take into account that it already support almost all necessary
functionality. At present this will require custom ChoiceRenderer for each such
property, while it can be done is one piece of generic code.
> getModelValue() in AbstractSingleSelectChoice and ListMultipleChoice can't
> handle complex list items type correctly
> -------------------------------------------------------------------------------------------------------------------
>
> Key: WICKET-1331
> URL: https://issues.apache.org/jira/browse/WICKET-1331
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.3.0-final, 1.3.1
> Environment: Suse 10.3, JRE 1.6 (1.6.0_04-b12), jetty 6.1.7
> Reporter: Sergiy Yevtushenko
> Assignee: Igor Vaynberg
> Attachments: testproject.zip
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> AbstractSingleSelectChoice.getModelValue() implementation uses List.indexOf()
> to find the key and this causes problems if list of choices contains complex
> values rather than simple list of String instances. In this case indexOf()
> returns -1 and this can't be resolved by overriding equals() for list
> elements. This happens because internally AbstractList.indexOf() invokes
> equals() method of passed key value passing it list items as a parameter.
> Also, current implementation may pass key returned by getModelObject() to
> IChoiceRender, while it expects values from list of items. Correct
> implementation of this method may look so:
> -------------------------
> public String getModelValue()
> {
> // @@ Modified by SIY
> Object object = getModelObject();
> if (object != null)
> {
> // compare choice items with given keys and pass down
> // to IChoiceRenderer list item rather than key
> Iterator iter = getChoices().iterator();
> int i = 0;
> while (iter.hasNext())
> {
> Object obj = iter.next();
> if (obj != null && obj.equals(object))
> {
> object = obj;
> break;
> }
> i++;
> }
> if (i > getChoices().size())
> i = -1;
> return getChoiceRenderer().getIdValue(object, i);
> }
> return NO_SELECTION_VALUE;
> }
> -----------------------------------
> Similar issues also present in ListMultipleChoice.getModelValue(), but they
> can't be resolved by overriding this method in subclass because this method
> declared final.
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