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two one to many associations that point to the same object

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ew0kian

Post subject: two one to many associations that point to the same object

Posted: Tue Dec 15, 2009 10:20 pm

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Joined: Wed Mar 19, 2008 12:10 am
Posts: 36

i'm using hibernate as my JPA layer. I want to be able to do:

user.getSentMessages()
and
user.getReceivedMessages()

where both of those would be hitting the Messages object.

The messages object would have sender and receiver properties. Is it possible/advisable to map an association like this? How would you do it using JPA annotations?

Last edited by ew0kian on Tue Dec 15, 2009 10:58 pm, edited 1 time in total.

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ringerc

Post subject: Re: two one to many associations that point to the same object (

Posted: Tue Dec 15, 2009 10:57 pm

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Joined: Mon Dec 14, 2009 12:26 am
Posts: 23

Sure. It's just a table with two foreign-key references to the same primary key in some other table. So just map it using @OneToMany on each referencing column. Hibernate doesn't care that the two @OneToMany mappings point to the same target entity.

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ew0kian

Post subject: Re: two one to many associations that point to the same object

Posted: Tue Dec 15, 2009 11:03 pm

Beginner

Joined: Wed Mar 19, 2008 12:10 am
Posts: 36

cool. thanks for clearing this up. its one of those things where i looked in the book and didnt see anything about it so i assumed it might not be possible

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