[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-572) Repeated columns rejected in a collection of composite elements
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http://opensource.atlassian.com/projects/hibernate/browse/HHH-572?page=co...
]
greg jablonski commented on HHH-572:
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Is there a workaround for the case where you want the many-to-one to be the derived
association? I'm trying to do this because my many-to-one is mapped with
not-found="ignore", and the property mapping to the same column is that foreign
key, and I want to have access to the foreign key value regardless of whether the
association is null or not, and a formula won't let me save that property if the
many-to-one is null.
What I want to do is this:
<set name="siblings" table="SIBLINGS">
<key column="child_id" />
<composite-element class="Child">
<property name="foo" column="foo">
<property name="siblingId" column="sibling_id"
/>
<many-to-one name="sibling" column="sibling_id"
class="Child" update="false" insert="false"
not-found="ignore" />
</composite-element>
</set>
(I realize this looks a little strange, but SIBLING is really a direction-specific
many-to-many join table augmented with "foo" in the example case.) Thanks.
Repeated columns rejected in a collection of composite elements
---------------------------------------------------------------
Key: HHH-572
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-572
Project: Hibernate3
Type: Bug
Versions: 3.0.5
Environment: JRE 1.4.2_08
Reporter: Emmanuel Bourg
Assignee: Gavin King
Priority: Minor
Repeating a column in a collection of composite elements triggers an error when the
mapping is parsed, even if the property with the repeated column has the insert and update
attributes set to false:
<set name="children" table="CHILDREN">
<key column="PARENT_ID"/>
<composite-element class="Child">
<property name="parentId" column="PARENT_ID"
insert="false" update="false" />
</composite-element>
</set>
or
<set name="roles" table="ROLE">
<key column="PARENT_ID"/>
<composite-element class="Role">
<many-to-one name="child" class="Child"/>
<property name="childId" column="CHILD_ID"
insert="false" update="false" />
</composite-element>
</set>
Hibernate throws this exception:
org.hibernate.MappingException: Repeated column in mapping for collection:
Parent.children column: PARENT_ID
at org.hibernate.mapping.Collection.checkColumnDuplication(Collection.java:275)
at org.hibernate.mapping.Collection.checkColumnDuplication(Collection.java:298)
at org.hibernate.mapping.Collection.validate(Collection.java:255)
at org.hibernate.mapping.Set.validate(Set.java:19)
at org.hibernate.cfg.Configuration.validate(Configuration.java:817)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:976)
a workaround is to use a formula:
<set name="children" table="CHILDREN">
<key column="PARENT_ID"/>
<composite-element class="Child">
<property name="parentId" formula="PARENT_ID"/>
</composite-element>
</set>
This works fine with the fix for HHH-539
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