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 google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
