Python decorating classes and preserving name

I am trying to create decorator for classes which takes parent_klass as an argument and modifies original class by inheriting parent_klass and returns it. See below implementation of this idea:

class HelperClass: def helper_method(self): print("helper method...") def inherit_from(parent_klass): def wrapper(cls): class DecoratedClass(cls, parent_klass): pass return DecoratedClass return wrapper @inherit_from(HelperClass) class Foo: pass f = Foo() f.helper_method() # prints helper method... print(Foo.__name__) # prints DecoratedClass 

Above code works as I expected except the last print line. My problem is that __name__ attribute of original class (Foo) is not preserved and replaced by DecoratedClass. How can I apply functools.wraps functionality in this case? Is there any other way than using wraps function?

EDIT: Actually, I want to use this decorate in Django project, in which __name__ attribute is important for database mapping. This decorator is intended to generate dynamic models that also contains custom managers. Simply inheriting the class without decorator does not solve my problem, since supplied argument ('parent_klass' in this case, but 'custom queryset' class in actual implemetation), is also used in bases class's (Foo) methods.