[hibernate-issues] [Hibernate-JIRA] Commented: (ANN-632) @IndexColumn doesn't set value of index column

[J (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/ANN-632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30820 ] 

J commented on ANN-632:
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I also had some simular problems. I thought it was a bug, but it wasn't. When using IndexColumn you carefully have to know:
-where you define the inverse side
-that you shouldn't use the inverse side for saving the index
-that you save in the correct order of parent and child.
-how to swap from inverse side if needed.

Dan Allen, in your first example you have: mappedBy = "job". I think this should be mappedBy = "person', because the mappedBy attribute has to be the inverse property of the target entity.
Second, in your usage of the first example, you use: person.getJobs().add(job1); But this is on the inverse side, so it should be job1.setPerson(person) instead. (Or you should make a convenience method, of you should change the inverse side.)

Also took me a lot of time before I found my problem.
Btw I enjoy reading your new Seam book :-)

> @IndexColumn doesn't set value of index column
> ----------------------------------------------
>
>                 Key: ANN-632
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/ANN-632
>             Project: Hibernate Annotations
>          Issue Type: Improvement
>          Components: documentation
>    Affects Versions: 3.3.0.ga
>            Reporter: Dan Allen
>            Assignee: Diego Plentz
>            Priority: Minor
>
> I'm sure I will get screamed at for this, but the @IndexColumn just doesn't work with @OneToMany.  When I say it doesn't work, it means that I am a reasonable person and I have studied the documentation for at least 4 hours and I just cannot figure out how to make it work.  So either the documentation needs to be improved, or there is something wrong with Hibernate. I refuse to believe that I am this stupid.
> Here is my problem in a nutshell.  I have a Person and a collection of Jobs. The Jobs should be an indexed list based on the history that the person holds them.
> @Entity
> public class Person {
>     @Id @GeneratedValue
>     private long id;
>     @Column
>     private String name;
>     @OneToMany(cascade=ALL, fetch=LAZY, mappedBy = "job")
>     @IndexColumn(base = 1, name = "order")
>     private List<Job> jobs = new ArrayList<Job>();
>    // getters and setters
> }
> @Entity
> public class Job {
>     @Id @GeneratedValue
>     private long id;
>     @Column
>     private String name;
>     @ManyToOne
>     @JoinColumn(name="person_id")
>     private Person person;
>     @Column
>     private Integer order;
>    // getters and setters
> }
> If I do the following, I get NULL for order.
> Person person = new Person();
> person.setName("Chuck")
> Job job1 = new Job();
> job1.setName("sysadmin")
> job1.setPerson(person);
> person.getJobs().add(job1);
> Job job2 = new Job();
> jobs2.setName("network admin")
> job2.setPerson(person);
> person.getJobs().add(job2);
> entityManager.persist(person);
> Assume that the reason I am not assigning an order is more complex than this example. The point is that we want to see the order column populated with the index of the list.
> Now, if you give me the business about removing mappedBy, to that I will respond that by removing mappedBy, Hibernate tries to work with a person_job table, which I don't want. I want two tables, one for person and one for job.

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