Ticket #3881: session_save.patch

contrib/sessions/middleware.py

@@ -12 +12 @@
         self.session_key = session_key
         self.accessed = False
         self.modified = False
+        self.exception_occured = False
 
     def __contains__(self, key):
         return key in self._session
@@ -71 +72 @@
     def process_request(self, request):
         request.session = SessionWrapper(request.COOKIES.get(settings.SESSION_COOKIE_NAME, None))
 
+    def process_exception(self, request, exception):
+        self.exception_occured = True;
+
     def process_response(self, request, response):
+        # Don't try to save session when process method raised an exception. In case of database exceptions
+        # it may not even be possible. See ticket #3881.
+        if self.exception_occured:
+            return response
+
         # If request.session was modified, or if response.session was set, save
         # those changes and set a session cookie.
         try: