request.session.save() raise TypeError: [<Group: Admin user>] is not JSON serializable

[Cao T]

request.session.save() raise TypeError: [<Group: Admin user>] is not JSON serializable

it's the auth.models.Group.objects.all() that is not JSON serializable. it worked perfect well upto django 1.5.

Django 1.5:

    def encode(self, session_dict):
        "Returns the given session dictionary pickled and encoded as a string."
        pickled = pickle.dumps(session_dict, pickle.HIGHEST_PROTOCOL)
        hash = self._hash(pickled)
        return base64.b64encode(hash.encode() + b":" + pickled).decode('ascii')

Django 1.7:

    def encode(self, session_dict):
        "Returns the given session dictionary serialized and encoded as a string."
        serialized = self.serializer().dumps(session_dict)
        hash = self._hash(serialized)
        return base64.b64encode(hash.encode() + b":" + serialized).decode('ascii')

it looks there is some issue with self.serializer().

[Simon Charette]

For ​documented security reasons sessions are serialized using JSON instead of pickle since Django 1.6.

If you want to store a collection of model instances using django.contrib.sessions.serializers.JSONSerializer I suggest you convert it to a list of primary keys instead:

sessions['groups'] = [group.pk for group in groups]