Fixed Anon user singleton.

server/app/auth.py

@@ -1,8 +1,10 @@
 """Convert access tokens to user records."""
 
+# Because pylint doesn't understand memcache for some reason
+# pylint: disable=no-member
+
 from app import models
 from app import app
-from app.utils import create_api_response
 from app.authenticator import AuthenticationException
 
 from google.appengine.api import memcache as mc
@@ -21,7 +23,7 @@ def authenticate():
         return models.User.get_or_insert(user.email())
 
     if 'access_token' not in request.args:
-        return models.AnonymousUser
+        return models.AnonymousUser()
     else:
         access_token = request.args['access_token']
         user = mc.get("%s-%s" % (MC_NAMESPACE, access_token))

server/app/models.py

@@ -190,10 +190,16 @@ def put(self, *args, **kwds):
 
     @classmethod
     def get_or_insert(cls, *args, **kwds):
-        return super(AnonymousUser, cls).get_or_insert(*args, **kwds)
+        return super(_AnonUserClass, cls).get_or_insert(*args, **kwds)
 
+_AnonUserClass = AnonymousUser
+_AnonUser = None
 
-AnonymousUser = AnonymousUser.get_or_insert("anon_user")
+def AnonymousUser():
+    global _AnonUser
+    if not _AnonUser:
+        _AnonUser = _AnonUserClass.get_or_insert("anon_user")
+    return _AnonUser
 
 
 class Assignment(Base):

server/tests/test_permissions.py

@@ -60,7 +60,7 @@ def get_accounts(self):
                 login="albert",
                 role=ADMIN_ROLE
             ),
-            "anon": models.AnonymousUser,
+            "anon": models.AnonymousUser(),
         }
 
     def enroll(self, student, course):