Question

I use the blobstoreuploadhandler and hence must return a self.redirect but I need to pass values to my template. How can I do it? If I can’t use template values then I suppose I can use session variables and I’ve included the beaker session library but I can’t understand how to access the session variables in django template. Any idea how I should do it?

I use default builtin django with google app engine and I can access session variables with a request handler but I don’t understand how to do it in templates:

class Sessiontest(webapp.RequestHandler):
    def get(self):
        # Get the session object from the environ
        self.session = self.request.environ['beaker.session']

        # Check to see if a value is in the session
        if 'counter' in self.session:
            counter = self.session['counter'] + 1
            self.session['counter'] = counter

        else:
            self.session['counter'] = 1
            counter = 1
        self.session.save()
        self.response.out.write('counter: %d' % counter)

Thanks

Update/edit: My problem is almost exactly like this Accessing session variable in Django template with Google App Engine (Webapp) – Python but with the library beaker instead of gaeutilities

Update: Here’s some of the code. we see that using HTTP GET to pass the values won’t be very good since there’s an anti-spam test that should hide the values:

def post(self, view):
    message = ''
    challenge = self.request.get('recaptcha_challenge_field').encode('utf-8')
    response  = self.request.get('recaptcha_response_field').encode('utf-8')
    remoteip  = os.environ['REMOTE_ADDR']
    cResponse = captcha.submit(
                 challenge,
                 response,
                 CAPTCHA_PRV_KEY,
                 remoteip)
    if cResponse.is_valid:
        isHuman=True
    else:#failed anti-spam test and can try again
        isHuman=False
        #Reprint the form
        import util
        template_values = {'isHuman':isHuman,'user' : users.get_current_user(),}
        template_values.update(dict(current_user=self.current_user, facebook_app_id=FACEBOOK_APP_ID))
        template_values.update(dict(capture=captcha.displayhtml(public_key = CAPTCHA_PUB_KEY, use_ssl = False, error = None)))
        path = os.path.join(os.path.dirname(__file__), 'market', 'market_insert.html')
        self.redirect("/ai") # Here the values aren't passed on and I must make a redirect

Answer 1

If you are doing a redirect you might have to redirect with the variables that you wish to keep in the GET string. So you redirect from

/myview/

to

/myview2/?variable1=value

However, I think you should really look to see why you are doing redirects. I tend to do them after a POST to a form, and if the user needs to be logged on, I redirect to a login screen with

/authentication/login/?next=/view/they/wanted/to/see

Otherwise you could keep things in cookies but its not the best way to proceed.