I'm sorry, I'm not quite sure what you mean.
The @SelectItems annotation (mine, not Jim's) in concert with the
EntityConverter allows you to select multiple objects (from a generated list)
and set them 'directly' (via the value attribute) as a collection on any object.
The only caveat is that the objects being selected MUST be entities which have
been previously persisted (as it uses the @Id annotation as the identifier). I
don't think it will work for composite foreign keys either.
Othewise you'll need to write a converter for that specific case. I've got
some ideas for a non-entity generic converter but tbh I can't really think of
many situations where a combination of PAGE scope and Strategy.INDEX or
Strategy.STRING don't work.
So you can do
| <h:selectManyListbox value="#{x.yList}
converter="org.jboss.seam.EntityConverter">
| <f:selectItems value="#{yList}" />
| </h:selectManyListbox>
|
| @Name("yLister")
| @Stateless
| public class YListerBean implements YLister {
|
| @SelectItems
| private List<Y> yList;
|
| @In(create=true)
| private EntityManager em;
|
| @Factory("yList")
| public void buildYList() {
| yList = em.createQuery("select y from Y y").getResultList();
| }
|
| }
|
where YLister is an interface declaring public void buildYList() and the entity
classes x and y are as you describe and there is a FormActionBean for loading x.
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