Hello,
I'm working on trying to pull down an entity as well as two of its
collection-valued references using a FetchGroup / FetchPlan, and must be
doing something wrong--I'm getting the entity, but not the items in its
fetch group. I'm wondering if anyone could spot-check my work. Does the
following scream out for revision?
My entity definition, using a FetchGroup modeled off of the one in the
user's guide.
@Entity
> @FetchGroups(
> @FetchGroup(name="detail", attributes={
> @FetchAttribute(name="assignedResponsibilities"),
> @FetchAttribute(name="relationships")}))
> public class PartyRole<P extends Party>
> extends BaseArchetype {
>
> @ManyToOne(cascade = {
> CascadeType.PERSIST,
> CascadeType.MERGE})
> @Column(nullable=false)
> @Type(Party.class)
> private P party;
>
> @ManyToOne(cascade = {
> CascadeType.PERSIST,
> CascadeType.MERGE})
> @Column(nullable=false)
> private PartyRoleType type;
>
> @OneToMany(cascade=CascadeType.ALL)
> private Set<AssignedResponsibility> assignedResponsibilities =
> new HashSet<AssignedResponsibility>();
>
> @ManyToMany(cascade={
> CascadeType.PERSIST,
> CascadeType.MERGE},
> mappedBy="participants")
> @ElementType(PartyRelationship.class)
> Set<PartyRelationship<P>> relationships = new
> HashSet<PartyRelationship<P>>();
> ...
> }
>
The query method in question:
>
> ...
> public List<PartyRole> getPartyRoles(){
> Query query = entityManager.createQuery("SELECT a from PartyRole
> as a");
> OpenJPAQuery q = OpenJPAPersistence.cast(query);
> q.getFetchPlan().setMaxFetchDepth(2).addFetchGroup("detail");
> return q.getResultList();
> }
> ...
>
Finally, the snippet from my test code. The line where I call the first
collection-valued reference (to set name "preMerge relationship") gives me
"No such element" at the "next()" call. All else up until that point works
fine. This is a common testing pattern I use in my tests to test correct
MERGE annotation configs, and I'm very confident the problem isn't in the
test code.
...
> refresh(partyRoles, partyRoleTypes, parties, partyRelationships,
> assigResps);
> checkListSize(
> pkg(1, 1, 1, 1, 1),
> pkg(partyRoles, partyRoleTypes, parties,
> partyRelationships, assigResps));
>
> PartyRole<Party> preMerge = null;
> PartyRole<Party> postMerge = null;
> for(PartyRole item : partyRoles) {
> if(item.getID() == initial.getID()) preMerge = item;
> }
> Assert.assertNotNull(preMerge);
>
> preMerge.setName("preMerge");
> preMerge.getParty().setName("preMerge party");
> preMerge.getPartyRoleType().setName("preMerge partyRoleType");
> preMerge.getRelationships().iterator().next().setName("preMerge
> relationship");
>
> preMerge.getAssignedResponsibilities().iterator().next().setName("preMerge
> assigned responsibility");
> ...
>
>From what I can glean out of the user's guide, I set up the FetchGroup
correctly. Can anyone see something obviously wrong or missing? FWIW, all
of the entities in my library already have passed heavy-duty CRUD tests, so
we know the entities are in there!
Cheers,
--
Alexander R. Saint Croix
