Silly question - persisting child objects

[hardaur]

I have 2 classes, a contest, and a prize.  A contest has a one to many relationship to prize.

In the view, I'm instantiating (but NOT persisting) prizes and adding them to the contest.  When the user calls the save action I call entityManager.persist(contest).  This works correctly, saving the contest, and the prizes. . .however, the prizes do not have the FK back to contest (contest_id).

Contest:
        @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "contest")
        public Set<Prize> getPrizes() {
                return this.prizes;
        }


Prize:
        @ManyToOne(fetch = FetchType.LAZY)
        @JoinColumn(name = "contest_id")
        public Contest getContest() {
                return this.contest;
        }

Any pointers on why this is happening?  I'm sure it's something silly, but after 2ish hours with google I'm finding nothing.

Thanks!

Gerald

[nicolas.bielza]

Are you calling setContest() on the prizes when you create them ?

[hardaur]

That was it, thanks for your reply. 

It seems like it should be assumed by Seam that children of a one to many relationship belong to the parent and should be persisted in that way.  If that makes sense.

Thanks again!

Gerald

[binnyg]

I usually do it in addXXX methods.
In your Contest class you can add a transient method like the following

@Transient
public void addPrize(Prize prize) {
  prize.setContext(this);
  this.prizes.add(prize);
}

[hardaur]

Binesh,

  Excellent suggestion, thanks!

Gerald