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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