I can use
query.setFilter("tags.contains(tags1)"); // not containsAll
with java.util.List object as tag. But it will return any object
containing at list one tag.
I wish to search for objects that has all tags that I specify. Is that
possible to do?
On Feb 12, 12:48 am, Max <max.seven....@gmail.com> wrote:
> Thanks, but if I add
>
> Set<String> tags
>
> and I search
>
> query.setFilter("tags.containsAll(tags1)");
> query.declareParameters("java.util.List
> tags1");
>
> Then it tells
>
> Unsupported method <containsAll> while parsing expression:
> InvokeExpression{[PrimaryExpression{tags}].containsAll(ParameterExpression{
> tags1})}
>
> Is that possible to search for multiple tags or not?
>
> ---
>
> I have some ideas how to search for 2 tags or 3 tags. But it will
> requires all 2 tag pair combinations to be stored for each object. 3
> tags search will require even more combinations of 3 tags for each
> object.
>
> Have someone implemented tag search already?
>
> Thanks,
> Max
>
> On Feb 9, 9:34 pm, John Patterson <jdpatter...@gmail.com> wrote:
>
>
>
> > Hi Max, you could store tags as a multi-valued property which will
> > allow you to search for entities with all tags in a single query. To
> > track how common a tag is you should maintain a count entity for each
> > one.
>
> > On 10 Feb 2010, at 02:23, Max wrote:
>
> > > I already searched&read app-engine(|-java|-python) forums for "tag
> > > search" and it looks like the the best way to implement tags is
> > > unordered relationship many to many.
>
> > > I can search for object with one tag. But I would like to specify
> > > multiple tags.
>
> > > e.g. I wish objects that has all 10 tags that I specify or any of 10
> > > tags that I specify.
>
> > > I would like to generate tag cloud also.
> > > But "SELECT name, count(name) from Tags GROUP by name" is not
> > > supported
>
> > > Is that possible to implement all most common tag features with app
> > > engine?
>
> > > I start thinking that it is not possible.
>
> > > I will have millions of object. So I can't select all objects.
>
> > > Have someone implemented tags in App Engine?
>
> > > Please, tell if know that it is not possible to implement tags in App
> > > Engine.
>
> > > Thanks, Max
>
> > > --
> > > You received this message because you are subscribed to the Google
> > > Groups "Google App Engine for Java" group.
> > > To post to this group, send email to
> > > google-appengine-java@googlegroups.com
> > > .
> > > To unsubscribe from this group, send email to
> > > google-appengine-java+unsubscr...@googlegroups.com
> > > .
> > > For more options, visit this group
> > > athttp://groups.google.com/group/google-appengine-java?hl=en
> > > .
--
You received this message because you are subscribed to the Google Groups
"Google App Engine for Java" group.
To post to this group, send email to google-appengine-j...@googlegroups.com.
To unsubscribe from this group, send email to
google-appengine-java+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/google-appengine-java?hl=en.
