Collections on base class.

[Rhys Parsons <rh...@causeway.com>]

Hi,

I have three classes extended from a base class.  The base abstract class
is Item.  The three subclasses are PricedItem, CompositeItem and TextItem.

I also have a Contract class which contains a collection of Items.

I have mapped the PricedItem, CompositeItem and TextItem classes to one
table called ITEM.  The mapping for Contract contains the following:

        <collection-descriptor
            name="items"
            element-class-ref="com.causeway.valuations.data.Item"
            orderby="position"
            sort="DESC"
        >
            <inverse-foreignkey field-ref="owningCompositeId"/>
        </collection-descriptor>

Initially I only had a single field descriptor in Item for the contractId,
but have added identical descriptors for each of the subclasses too.
However, on examining the ITEM table, I find that in the first case, the
CONTRACT_ID field is NULL; and in the second case it contains the value 0.
However, the contract actually has the ID 1.

All other references and collections are working correctly, so I'm guessing
that this is to do with referencing a base class.

So, is there actually a way of mapping a collection to a base class in this
way?

If anyone could help me, that would be great!

Cheers!

Rhys Parsons


Causeway Technologies Limited
Tel:    (+44 (0)1628 552000)
Fax:    (+44 (0)1628 552001)
http://www.causeway.com

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