In my Rails 3 app I use an engine having PostsController. I would like
extend it in the main app by adding and altering some methods. I have
some things which you can see in stackoverflow.com/questions/5045068/ .
There I am facing an exception since PostsController has different
superclasses in my engine and main app. Do you know how I can fix it? Is
possible to fix without modifying the engine?