I'm not sure but maybe JDO is trying to query asceding to fetch the
children before adding.
On Thu, Feb 2, 2012 at 9:36 PM, Miguel <doctormig...@gmail.com> wrote:
> Hi,
> I am working on a simple structure similar to:
>
> class Parent {
> ...
> List<Child> children
> ..
> }
>
> class Child {
> ..
> Parent parent
> ..
> }
>
> mapped with a 1-N relation in JDO:
> <field persistence-modifier="persistent" name="children" mapped-
> by="parent">
> <collection dependent-element="true" element-type="Child"></
> collection>
> <order/>
> </field>
>
>
> with a simple index:
> <datastore-index kind="Child" ancestor="true" source="manual">
> <property name="children_INTEGER_IDX" direction="desc"/>
> </datastore-index>
>
> .. and I always retrieve Children in descending order.
>
> But when I add a children I get this error:
> com.google.appengine.api.datastore.DatastoreNeedIndexException: no
> matching index found.
> The suggested index for this query is:
> <datastore-index kind="Child" ancestor="true" source="manual">
> <property name="children_INTEGER_IDX" direction="asc"/>
> </datastore-index>
>
> So my question is: why do I always need both indexes for ascending and
> descending order if I need only type of ordering?
>
> Thanks,
> Michele
>
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--
Bruno Fuster
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