How to pass a class method as a parameter to a class method decorator?

Question

Django

The layout is like this:

class Foo():
    @condition(last_modified_func=get_obj_mtime)
    def retrieve(self, request, *args, **kwargs):
        блаблабла

def condition(etag_func=None, last_modified_func=None):
    def decorator(func):
        @wraps(func, assigned=available_attrs(func))
        def inner(request, *args, **kwargs):
            # Get HTTP request headers
            блаблабла

The last_modified_func parameter must be passed to the method associated with the object, or at least the class.
What else is there to turn into?

Answer 1

What is not working now? At first glance, inner should have self as its first argument, which is an instance of the Foo class.