I am not sure what the design decision was behind this and perhaps one of the
Wicket Gurus can weigh in on this but I ran into something very similar
recently, and here are my thoughts:
I think you are mixing the model object that backs the Dropdown and the
actual Broker object. They are not the same thing. For example, having
Broker id's in the final rendered HTML is a potential security risk.
That being said, I could not find a elegant solution to the same exact
problem. I ended up subclassing DropdownChoice. Adapted to your code, it
looked something like:
private HashMap<String, Broker>map = new HashMap<String, Broker>();
...
//get a list of the String that will be your choices
for(Broker b : (Application)
getApplication()).getBrokerDao().getUniqueBrokers())
{
map.put(b.getName(), b);
}
setChoices(new ArrayList<String>(map.keySet()));
...
public HashMap<String, Broker> getMap()
{
return map;
}
Then, in your onSubmit() method for the containing component you can access
the Id of each broker like this:
brokerDropDown.getMap().get(modelObject.getBrokerName()).getId()
I hate this approach. I would love to have someone point me in a better
direction.
Yevgeni Kovelman wrote:
>
> I have the following problem, I have a dropdownchoice component. The load
> method returns a list of Broker objects which have an id and displayName
> attributes. Although currently not in this code, I will use the
> iChoiceRenderer to populate the appropriate values. The Request instance
> object is a backing object which contains brokerId as an attribute.
>
>
>
> My question is it possible to populate the instance.brokerId with the
> broker
> id that gets rendered by iChoiceRenderer. Currently I get an ClassCast
> exception because the loaded model is of type Broker and the
> instance.brokerId is long.
>
>
>
> Request instance = new Request();
>
> // instance has broker as a long attribute
>
>
>
> Form form = new Form("entryForm", new CompoundPropertyModel(instance));
>
> add(form);
>
>
>
> DropDownChoice broker =
>
> new DropDownChoice("broker",
>
> new PropertyModel(instance, "broker"),
>
> new LoadableDetachableModel()
>
> {
>
> @Override
>
> protected Object load()
>
> {
>
> return ((Application) getApplication())
>
> .getBrokerDao().getUniqueBrokers();
>
> }
>
> }
>
> );
>
> broker.setRequired(true);
>
> form.add(broker);
>
>
>
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