Nope. The values in the list themselves are indexed, not the list. You may want to create a new property for empty lists if you need to do this.
-- Ikai Lan Developer Programs Engineer, Google App Engine Blogger: http://googleappengine.blogspot.com Reddit: http://www.reddit.com/r/appengine Twitter: http://twitter.com/app_engine On Thu, Nov 4, 2010 at 2:51 PM, Tim Jones <[email protected]> wrote: > Is there a way, using a single Query.filter() call or GQL operator, to > search for all entities for which a particular ListProperty is empty? > > So for instance, say I have a type called Book and a type called Genre. > These Books can have multiple genres, so my Book type has a > ListProperty(db.key) which contains a list of keys for Genres. Can I easily > run a query which returns a list of Books with no Genre? > > It seems likely to me that this is impossible, but I thought I'd ask. > > Thanks! > > =T= > > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" 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 at http://groups.google.com/group/google-appengine?hl=en.
