Hi Khai,
Due to the way entities are indexed, there's no way to query directly
for entities with empty lists. Your best option is to add a
BooleanProperty that you set to True whenever the ListProperty is
empty, and query on that.
-Nick Johnson
On Thu, Jun 25, 2009 at 11:44 PM, Khai<khaitd...@gmail.com> wrote:
>
> I have a model:
>
> class BlogEntry(db.Model):
> content = db.TextProperty()
> tags = db.StringListProperty()
>
> To fetch entries that had been tagged with 'Math', I would write a
> GQL:
>
> BlogEntry.gql("WHERE tags = :tag", tag = "Math")
>
> How can I fetch entries that had not been tagged?
> >
>
--
Nick Johnson, App Engine Developer Programs Engineer
Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration
Number: 368047
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