Ticket #21608: session_fix.patch

django/contrib/sessions/backends/db.py

@@ -53 +53 @@
             expire_date=self.get_expiry_date()
         )
         using = router.db_for_write(Session, instance=obj)
-        sid = transaction.savepoint(using=using)
-        try:
-            obj.save(force_insert=must_create, using=using)
-        except IntegrityError:
-            if must_create:
+        if must_create:
+            sid = transaction.savepoint(using=using)
+            try:
+                obj.save(force_insert=must_create, force_update=not must_create, using=using)
+            except IntegrityError:
                 transaction.savepoint_rollback(sid, using=using)
                 raise CreateError
-            raise
+        else:
+            Session.objects.using(using).filter(pk=obj.session_key).update(session_data=obj.session_data, expire_date=obj.expire_date)
 
     def delete(self, session_key=None):
         if session_key is None: