peterdemin · May 8, 2023 17:10 · Jun 21, 2013 · Jun 21, 2013
diff --git a/myapp.middleware.py → one_session_per_user.middleware.py b/myapp.middleware.py → one_session_per_user.middleware.py
@@ -1,4 +1,4 @@
-from myapp.models import User, Visitor
+from one_session_per_user.models import User, Visitor
 from django.contrib.sessions.models import Session
 
 

diff --git a/myapp.models.py → one_session_per_user.models.py b/myapp.models.py → one_session_per_user.models.py
diff --git a/myapp.middleware.py b/myapp.middleware.py
@@ -0,0 +1,22 @@
+from myapp.models import User, Visitor
+from django.contrib.sessions.models import Session
+
+
+class OneSessionPerUserMiddleware(object):
+    """http://stackoverflow.com/a/1814797"""
+
+    def process_request(self, request):
+        if isinstance(request.user, User):
+            current_key = request.session.session_key
+            if hasattr(request.user, 'visitor'):
+                active_key = request.user.visitor.session_key
+                print active_key, current_key
+                if active_key != current_key:
+                    Session.objects.filter(session_key=active_key).delete()
+                    request.user.visitor.session_key = current_key
+                    request.user.visitor.save()
+            else:
+                Visitor.objects.create(
+                    pupil=request.user,
+                    session_key=current_key,
+                )
diff --git a/myapp.models.py b/myapp.models.py
@@ -0,0 +1,3 @@
+class Visitor(models.Model):
+    pupil = models.OneToOneField(User, null=False)
+    session_key = models.CharField(null=False, max_length=40)
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