Add anonymoususer sigleton model manager

mayan/apps/common/managers.py

@@ -0,0 +1,10 @@
+from django.db import models
+from django.contrib.auth.models import AnonymousUser
+
+
+class AnonymousUserSingletonManager(models.Manager):
+    def passthru_check(self, user):
+        if isinstance(user, AnonymousUser):
+            return self.model.objects.get()
+        else:
+            return user

mayan/apps/common/models.py

@@ -1,3 +1,5 @@
+from __future__ import absolute_import
+
 from django.db import models
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ugettext
@@ -6,8 +8,12 @@ from django.contrib.auth.models import User
 
 from solo.models import SingletonModel
 
+from .managers import AnonymousUserSingletonManager
+
 
 class AnonymousUserSingleton(SingletonModel):
+    objects = AnonymousUserSingletonManager()
+
     def __unicode__(self):
         return ugettext('Anonymous user')