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 <[email protected]> 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
>
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