I use Elixir in pylons

I try to use .clear() to update all the search result

but it seems has no effect , when I refresh the web page again and
again , sometimes the old search results will still show  .

my code is as below , is there any mistake ?thanks.
_____________________________________________
model/__init__.py
_____________________________________________
import elixir
from sqlalchemy import orm
Session = orm.scoped_session(
        orm.sessionmaker(
            #autoflush=True,
            #transactional=True
        )
    )

def init_model(engine):
    elixir.session = Session
    elixir.metadata.bind=engine
    elixir.setup_all()
_____________________________________________
use clear()
_____________________________________________
from zsite.model import Session
def get_feed(url,saver,*args,**kws):
        ............
        if updated:
            Session.clear()
        Session.remove()
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