request.user.save() doesnt work

Hi guys. Am using django non-rel on appengine. I am using django's
auth backend for my authentication, since I did not want to have to
force my users to use gmail logins, and appengine models
{google.appengine.ext.db} for the other models. I have a form where I
allow users to edit their email. So :

if settings_form.is_valid() :
user = request.user
user.email = request.POST['email']
user.save()

print request.POST['email'] returns the correct data entered in the
form. But user.save() just doesnt save!
Am I doing it correctly ? Is there something else I shopuld be doing ?
--
Regards,
Guy-at-the-end-of-the-tether :-)

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