M:N relation extra field in this table

zAEL · **Joined:** Wed Sep 15, 2004 9:35 am **Posts:** 13

hi,
I have a m:n relation table.
in this table are a component id and a material id. Extra there is a weightiness it is incidental from the component id and the material id.
how can I map the weight to hibernate? i

Dencel · **Joined:** Tue Jan 27, 2004 12:22 pm **Posts:** 103

Hello zAEL,

You should make a new composite object which renders the relation. The new object contains a new attribute weight.
In hibernate this can be mapped like this:

Code:

<class ...>
<set name="materials" table="component_material">
<key column="componentid"/>
<composite-element class="MyNewCompositeElement">
<many-to-one name="material" class="Material" column="materialid" />
<property name="weight"/>
</composite-element>
</set>
</class>

Hope this helps.