Objective C -- is there a keypath that will cause an object to return itself?

Question

Given an object foo of class Foo, I want to do the following:

NSString *key = @"some key";
id myObj = [foo valueForKey: key];

and have myObj equal to foo.

Is there a way to do this without defining a category on Foo?

Answer 1

The following works for me, returning foo:

id myObj = [foo valueForKey: @"self"];

Answer 2

id myObj = foo;