Actually, I think the problem is not with contains() but with the NOT operator (~) -- it doesn't work on GAE (technically, you can use it with a few operators, such as <, >, ==, because they can be negated by using the opposite operators).
Massimo, note that the syntax error used there is misspelled -- it says "suported" instead of "supported". Anthony On Thursday, April 12, 2012 2:48:51 AM UTC-4, Sathvik Ponangi wrote: > > From http://stackoverflow.com/q/10117143/937891 > > I'm trying to exclude posts which have a tag named meta from my selection, > by: > > meta_id = db(db.tags.name == "meta").select().first().id > not_meta = ~db.posts.tags.contains(meta_id) > posts=db(db.posts).select(not_meta) > > But those posts still show up in my selection. > > What is the right way to write that expression? > > My tables look like: > > db.define_table('tags', > db.Field('name', 'string'), > db.Field('desc', 'text', default="") > ) > > db.define_table('posts', > db.Field('title', 'string'), > db.Field('message', 'text'), > db.Field('tags', 'list:reference tags'), > db.Field('time', 'datetime', default=datetime.utcnow()) > ) > > *UPDATE:* > > I just tried posts=db(not_meta).select() as suggested by @Anthony, but it > gives me a Ticket with the following Traceback: > > Traceback (most recent call last): > File "E:\Programming\Python\web2py\gluon\restricted.py", line 205, in > restricted > exec ccode in environment > File > "E:/Programming/Python/web2py/applications/vote_up/controllers/default.py", > line 391, in <module> > File "E:\Programming\Python\web2py\gluon\globals.py", line 173, in <lambda> > self._caller = lambda f: f() > File > "E:/Programming/Python/web2py/applications/vote_up/controllers/default.py", > line 8, in index > posts=db(not_meta).select()#orderby=settings.sel.posts, limitby=(0, > settings.delta) > File "E:\Programming\Python\web2py\gluon\dal.py", line 7578, in select > return adapter.select(self.query,fields,attributes) > File "E:\Programming\Python\web2py\gluon\dal.py", line 3752, in select > (items, tablename, fields) = self.select_raw(query,fields,attributes) > File "E:\Programming\Python\web2py\gluon\dal.py", line 3709, in select_raw > filters = self.expand(query) > File "E:\Programming\Python\web2py\gluon\dal.py", line 3589, in expand > return expression.op(expression.first) > File "E:\Programming\Python\web2py\gluon\dal.py", line 3678, in NOT > raise SyntaxError, "Not suported %s" % first.op.__name__ > SyntaxError: Not suported CONTAINS > >
