python - App Engine redirect login based on user -

i have app engine project storing user's email address , specific redirect url user in datastore.

what want set redirect destination of login based on user logging in.

q = photos.all() q.filter("email =", users.get_current_user().email()) q = db.gqlquery("select * photos " +     "where email = :1 ", users.get_current_user().email()) p in q.run(): 

the variable p.redirect gives me url want specific user redirected to.

below have tried not working because user hasn't logged in yet receive following error attributeerror: 'nonetype' object has no attribute 'email'

    user = users.get_current_user()      if user:         # user signed in              else:         # user not signed in          q = photos.all()         q.filter("email =", users.get_current_user().email())         q = db.gqlquery("select * photos " +             "where email = :1 ", users.get_current_user().email())         p in q.run():             url = users.create_login_url(p.redirect)  template_values = {     'url': url,     } 

any appreciated. i've been working python & app engine couple of days may missing obvious.

mark resource (example: /photos) login:required in app.yaml. appengine redirect user login page , once completes login come resource (/photos) , @ time have email current user.

https://cloud.google.com/appengine/docs/python/config/appconfig#python_app_yaml_requiring_login_or_administrator_status