How to save entity with my id

Question

How to set id in model? I try this code:

public Community(Long id, ...) {
    this.id = id;
    ....
}

But when I do this:

Communtiy c = new (1, ...);
c.save();

Hibernate say:

Execution exception PersistenceException occured : org.hibernate.PersistentObjectException: detached entity passed to persist: models.Community

Please provide information about `Model`. What generation type of your id you are using? This question seems similar to yours http://stackoverflow.com/questions/2108178/id-generatedvalue-but-set-own-id-value. — Thor, Mar 03 '12 at 07:40

mcls · Accepted Answer · 2012-03-03T19:35:49.033

You can do this by extending from play.db.jpa.GenericModel instead of play.db.jpa.Model. This will allow you to set the primary key manually.

In fact, what Model does is extend from GenericModel and because it is very common to do so Model automatically generates primary keys ( by using @Id @GeneratedValue public Long id ). But if for whatever reason you want to set a custom primary key, then extending from GenericModel is the way to go.

Official documentation here.

Example

@Entity
public class Community extends GenericModel {
    @Id
    public Long id;

    public Community (Long id) {
        this.id = id;
    }
}

Thanks! This solution has helped me. – Anthony Tsivarev Mar 03 '12 at 14:09 — Anthony Tsivarev, Mar 03 '12 at 14:09

score 0 · Answer 2 · answered Mar 03 '12 at 07:50

0

Try not set id on your own, id should be loaded to model after save.

answered Mar 03 '12 at 07:50

IProblemFactory

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I want to use Id from Facebook – Anthony Tsivarev Mar 03 '12 at 10:32
but I assume that `id` property in your model is mapped to `id` into your DB. If you would like to store facebook `id` in DB make another field in class, `fbid` for example. – IProblemFactory Mar 03 '12 at 10:50

How to save entity with my id

2 Answers2