Another error in Hibernate Reference?

peterm · **Joined:** Mon Jul 23, 2007 12:37 pm **Posts:** 24

Either I'm having reading problems today, or I found another error. In 1.3.6. Working bi-directional links I read:

Quote:

The rules you have to remember are straightforward: All bi-directional associations need one side as inverse. In a one-to-many association it has to be the many-side, in many-to-many association you can pick either side, there is no difference.

Then, looking at 7.4.1. one to many / many to one I see

Code:

<class name="Person">
    <id name="id" column="personId">
        <generator class="native"/>
    </id>
    <many-to-one name="address" 
        column="addressId"
        not-null="true"/>
</class>

<class name="Address">
    <id name="id" column="addressId">
        <generator class="native"/>
    </id>
    <set name="people" inverse="true">
        <key column="addressId"/>
        <one-to-many class="Person"/>
    </set>
</class>

To me, it looks as though many people can live at one address. So people is the many-side, correct? But the inverse attribute is not in Person (=people), but in Address!

Then, in 7.5.1. one to many / many to one I read:

Quote:

Note that the inverse="true" can go on either end of the association, on the collection, or on the join.

How does this all fit together? I guess if a join table is used (§7.5.1), then the first quote does not count. OK - this information should be added in §1.3.6. But what about the many-side mix-up in §7.4.1.?

peterm · **Joined:** Mon Jul 23, 2007 12:37 pm **Posts:** 24

OK, just found this thread. So the many-side is the one with many references, in this example the Address. I think this should be made clear in the reference, and also §1.3.6 should incorporate the join table situation.
I have put this in Jira: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3302

Cameron McKenzie · **Posted:** Tue May 27, 2008 10:08 am

Thanks for the update. The clarification is definitely helpful.