How to access the request inside a model manager's get_query_set?

I would like to define a default manager for MyModel that always
filters all records (when the model is accessed from anywhere in my
application) based on data from the request:

e.g. on the lines of:

class MyModelManager(models.Manager):
#override default
def get_query_set(self, request):
if request.foo == bar:
return super(MyModelManager, self).get_query_set()
return MyModel.objects.filter(spam = eggs)

class MyModel(models.Model):
...
objects = MyModelManager()

However I get the error:

Django Version: 1.2.1
Exception Type: TypeError
Exception Value:
Error when calling the metaclass bases
get_query_set() takes exactly 2 arguments (1 given)

So its clear that get_query_set() cannot take the request inserted
there... but how else can I access the request inside the above model
Manager class?

(Note that I don't want to define an extra method that needs to be
appended onto the MyModels.objects.zzz type of chained calls - such
as the solution posted at http://osdir.com/ml/django-users/2010-02/msg00819.html
- as I would then have to make these changes throughout the
application, and also remember to add such a method to all future
code.)

Thanks
Derek

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