Thanks Jeff,
If I would like to find all users that have java level > 5 and c++
level > 2, then how to write a query in your suggested data model?
Best regards,
Max
On Mar 10, 12:18 pm, Jeff Schnitzer <j...@infohazard.org> wrote:
> Create a UserSkill entity with a parent key of User. Do a keysOnly
> query for UserSkill objects that match your criteria, then get the
> parent keys out of the UserSkill key, then do a batch get on the
> parent keys. The Objectify code:
>
> class UserSkill {
> @Id Long id;
> @Parent Key<User> user;
> String skill; // could also be Key<Skill> skill if you model Skill
> entities
> int ability;
>
> }
>
> List<Key<User>> userKeys = new ArrayList<Key<User>>();
> for (Key<UserSkill> key: ofy.query(UserSkill.class).filter("skill",
> "java").filter("ability >", 5).fetchKeys())
> userKeys.add(key.getParent());
>
> Collection<User> users = ofy.get(userKeys).values();
>
> Jeff
>
> On Tue, Mar 9, 2010 at 7:53 PM, Max <thebb...@gmail.com> wrote:
> > I start a new thread to recall this issue because the origin one can
> > not be replied any more.
>
> >http://groups.google.com/group/google-appengine-java/browse_thread/th...
>
> > Rusty Wright suggested a list of user keys to be stored in skill
> > entity. But that means only 5000 users can have the same skill.
>
> >http://groups.google.com/group/google-appengine-java/browse_thread/th...
>
> > Any other suggestions on this kind of problem?
>
> > Many thanks,
> > Max
>
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