On Dec 31, 2011, at 8:46 AM, sungchi wrote:
> now=time.time()
> sorts={
> 'hot':~db.news.hotness,
> 'score:~db.news.score,
> 'new':~db.news.post_time}
> orderby=sorts[sort]
> limitby=(50,101)
> news = db(db.news.post_time>(now-25922000.0)).select(limitby=limitby,
> orderby=orderby)
>
>
> Traceback (most recent call last):
> File "/Users/web2py/gluon/restricted.py", line 204, in restricted
> exec ccode in environment
> File "/Users/web2py/applications/feed9/controllers/default.py", line
> 352, in <module>
> File "/User/web2py/gluon/globals.py", line 162, in <lambda>
> self._caller = lambda f: f()
> File "/Users/web2py/applications/feed9/controllers/default.py", line
> 123, in index
>
> news=db(db.news.post_time>(now-2592000.0)).select(limitby=limitby,orderby=orderby)
> File "/Users/web2py/gluon/dal.py", line 6330, in select
> return self.db._adapter.select(self.query,fields,attributes)
> File "/Users/web2py/gluon/dal.py", line 3463, in select
> (items, tablename, fields) =
> self.select_raw(query,fields,attributes)
> File "/Users/sungchi9/Dropbox/python/web2py/gluon/dal.py", line
> 3458, in select_raw
> items = items.fetch(limit, offset=offset)
> File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/
> GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/
> google/appengine/ext/db/__init__.py", line 2084, in fetch
> return list(self.run(limit=limit, offset=offset, **kwargs))
> File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/
> GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/
> google/appengine/ext/db/__init__.py", line 2001, in run
> raw_query = self._get_query()
> File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/
> GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/
> google/appengine/ext/db/__init__.py", line 2357, in _get_query
> query.Order(*self.__orderings)
> File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/
> GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/
> google/appengine/api/datastore.py", line 1398, in Order
> (orderings[0][0], self.__inequality_prop))
> BadArgumentError: First ordering property must be the same as
> inequality filter property, if specified for this query; received
> score, expected post_time
>
>
>
> what's wrong? why not post_time filter with orderby argument?
http://code.google.com/appengine/docs/java/datastore/queries.html#Restrictions_on_Queries
> If a query has both a filter with an inequality comparison and one or more
> sort orders, the query must include a sort order for the property used in the
> inequality, and the sort order must appear before sort orders on other
> properties.
Just sort the result in code.
