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How to add exisitng object to OneToMany

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avihaimar77

Post subject: How to add exisitng object to OneToMany

Posted: Wed Jul 04, 2007 2:00 pm

Regular

Joined: Wed May 02, 2007 2:42 pm
Posts: 101

I have Hotel which has a collection of Room (OneToMany - unidirectional).

in transaction A:
I save new Room (id=1)

in this stage room FK is null

In transaction B:

Code:

Room room = em.get(Room .class,new Long(1))
Hotel hotel = em.get(Hotel.class,new Long(1))
hotel .getRooms().add(room)

But, i got an exception:

Code:

Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: model.Room

How can i add exisiting Object to a unidirectional collection?

Thank you

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avihaimar77

Post subject: Sorry this code work

Posted: Wed Jul 04, 2007 5:55 pm

Regular

Joined: Wed May 02, 2007 2:42 pm
Posts: 101

But,

If you send detach Room to transaction B and add it to the collection you will get an exception.

Hibernate think that it need to call to persist (i dont understand why).

If you will call explitity to mere on the collection it will be ok.

If you will put cascade mere on collection it will work.

If you put cascade.all on the collection you will get the same exception, because hibernate think it need to call to persist (dont understand why)

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