Mapping a collection to a joined-subclass

reisender · **Joined:** Wed Mar 04, 2009 3:26 pm **Posts:** 4

I have these mappings:

Code:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
    assembly="MyProject.Dto" namespace="MyProject.Dto.AbstractEntities">

    <class name="AbstractItem" table="ABSTRACT_ITEM">
        <id name="Id" column="ID" type="Int32" unsaved-value="0">
            <generator class="identity" />
        </id>
        ...
        <joined-subclass name="MyProject.Dto.ConcreteItem, MyProject.Dto" table="CONCRETE_ITEM">
            <key column="ABSTRACT_ITEM_ID" />
            ...
        </joined-subclass>
    </class>
</hibernate-mapping>

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
    assembly="MyProject.Dto" namespace="MyProject.Dto">

    <class name="User" table="USER">
        <id name="Id" column="ID" type="String">
            <generator class="assigned" />
        </id>
...
    </class>    
</hibernate-mapping>

My User entity needs a bag of ConcreteItems, but the relationship is a column in the ABSTRACT_ITEM table. I'm trying with this:

Code:

<bag name="ConcreteItems" inverse="true" cascade="all-delete-orphan">
            <key column="USER_ID"/>
            <one-to-many class="ConcreteItem" />
        </bag>

But I get an exception because the USER_ID column cannot be found in the CONCRETE_ITEM table. Any ideas please? Thanks!