On Tue, Jan 26, 2010 at 4:40 PM, Jeff Schnitzer <j...@infohazard.org> wrote:
>
> If you want to ask "what albums are this photo in?" (equivalent to
> "what messages are waiting for me" in the video), you query like this:
>
> OQuery<PhotoIndex> query =
> createQuery(PhotoIndex.class).filter("photos", photoKey);
> List<OKey<Album>> keys = ofy.prepareKeysOnly(query).asList();
> List<Album> albums = ofy.get(keys);
I made a mistake here - you need to grab the parents of the keys. So
the full process is:
OQuery<PhotoIndex> query =
createQuery(PhotoIndex.class).filter("photos", photoKey);
List<OKey<Album>> albumKeys = new ArrayList<OKey<Album>>();
for (OKey<PhotoIndex> indexKey: ofy.prepareKeysOnly(query).asIterable())
albumKeys.add(indexKey.getParent());
List<Album> albums = ofy.get(albumKeys);
We're making some API changes in v2 which will make this a little prettier.
Jeff
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