Hi Lucian,
> Is there a way to query for entities based on their grandparent?
>
> For example, suppose we have a root A entity, a B entity having A as
> parent, and a C entity having B as parent (A <- B <- C). Is is
> possible to query for all C entities in the database that have A
> entity as grand parent?
>
Unfortunately, AppEngine JDO does not support such a query,
but Low Level API supports an ancestor query, as follows:
DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
ds.prepare(new Query("C",
grandparentKey)).asList(FetchOptions.Builder.withOffset(0));
Hope this helps,
Yasuo Higa
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