monkey patching with @classmethod

[gentlestone]

Hi, is there some well-known problems with class method monkey
patching?

I've got this error message:

unbound method get_pocet_neocislovanych() must be called with Pozemok
instance as first argument (got Subjekt instance instead)

The method is declared as:
@classmethod
@monkeypatch(Dokument)
def get_pocet_neocislovanych(cls, subjekt):
    return cls.objects.filter(subjekt = subjekt, cislo__isnull =
True).count() # or pass, this line is not important

and the monkey patch decorator is declared as:
def monkeypatch(cls):
    def decorator(func):
        setattr(cls, func.__name__, func)
        return func
    return decorator

If I move the method to class declaration (whitout monkey patching),
everything is ok, but only if I've restarted the server.