Thank You! On Feb 12, 1:11 am, John Patterson <[email protected]> wrote: > Yes you can query for multiple tags. Not too sure about the JDO > syntax but try something like: > > query.setFilter("tags == 'hello'"); > query.setFilter("tags == 'world'"); > > On 12 Feb 2010, at 05:48, Max 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 <[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 > > >>> -- > >>> 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 > >>> [email protected] > >>> . > >>> To unsubscribe from this group, send email to > >>> [email protected] > >>> . > >>> 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 [email protected] > > . > > To unsubscribe from this group, send email to > > [email protected] > > . > > For more options, visit this group > > athttp://groups.google.com/group/google-appengine-java?hl=en > > .
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