Hi Sven,
Thanks, that did the trick. I thought that the Collection argument was
being generated by the framework, but now I understand what's happening.
On Sat, Apr 10, 2010 at 4:00 PM, Sven Meier <s...@meiers.net> wrote:
> Hi,
>
> ListMultipleChoice puts all selected parties into the model object you're
> returning in #getObject().
>
> Either you should return a copy of your collection in #getObject() or just
> do nothing in #setObject(). Your current call to #clear() is effectively
> clearing the new selection (i.e. affectedParties and arg0 are identical).
>
> Regards
>
> Sven
>
>
> Ray Weidner wrote:
>
>> Hi,
>>
>> I'm pretty new to Wicket and trying to get a better understanding of how
>> models work. That's probably why this is such a tricky problem for me.
>>
>> On my site, users are submitting a form for a new Issue to be created.
>> One
>> of the fields of this Issue is affectedParties; in the data model, this is
>> represented by a collection of PartyIssue objects, which associate a Party
>> with an Issue. Here's the simplified code:
>>
>> public class Issue {
>> ...
>> private Set <PartyIssue> affectedParties;
>>
>> public Set <PartyIssue> getAffectedParties () { ... }
>> public void setAffectedParties (Set <PartyIssue> affectedParties) { ...
>> }
>> ...
>> }
>>
>> public class Party {
>> ...
>> }
>>
>> public class PartyIssue {
>> private Issue issue;
>> private Party party;
>> ...
>> }
>>
>> The new Issue Form uses a new Issue object as the argument for the
>> CompoundPropertyModel. What I want to do is allow users to specify the
>> affected parties by multi-selecting from a list of Parties. Then, at the
>> time of submission, we should iterate through this list and construct
>> corresponding PartyIssues, which are associated with the Issue and then
>> created by the service layer (with validation etc.).
>>
>> So, how would I do this? This is how I've been trying to construct the
>> ListMultipleChoice:
>>
>> private Set <Party> affectedParties = new HashSet <Party> ();
>>
>> private ListMultipleChoice <Party> buildPartyDropdown (String property) {
>> IModel <Collection <Party>> affectedPartyModel = new IModel <Collection
>> <Party>> () {
>> @Override
>> public Collection <Party> getObject () {
>> return affectedParties;
>> }
>>
>> @Override
>> public void setObject (Collection <Party> arg0) {
>> affectedParties.clear ();
>> affectedParties.addAll (arg0);
>> }
>>
>> @Override
>> public void detach () {
>> // Nothing to do here
>> }
>> };
>>
>> IChoiceRenderer <Party> partyListRenderer = new IChoiceRenderer <Party>
>> () {
>> private static final long serialVersionUID = -1588547331340300417L;
>>
>> @Override
>> public Object getDisplayValue (Party arg0) {
>> return arg0.getFullName ();
>> }
>>
>> @Override
>> public String getIdValue (Party arg0, int arg1) {
>> return Long.toString (arg0.getRecordId ());
>> }
>> };
>>
>> ListMultipleChoice <Party> choice = new ListMultipleChoice <Party>
>> (property,
>> affectedPartyModel,
>> new Vector <Party> (getAllParties ()),
>> partyListRenderer);
>>
>> return choice;
>> }
>>
>> In my onSubmit() code for the Form, I attempt to iterate through the
>> affectedParties Set to create the Set of PartyIssues. However, this is
>> always turning out to be empty no matter what is selected on the form.
>> The
>> problem isn't in the onSubmit() code because the rest of the form is
>> processed and persisted properly, and log messages show that
>> affectedParties
>> is empty at that point. Note that the list choices are being rendered
>> properly. I'm sure I'm doing something very wrong so I'd appreciate any
>> guidance.
>>
>>
>
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