Rails - Feb 2011 - How to extend controllers of a Rails 3 Engine in the main app?

Hello,
In my Rails 3 app I use an engine having PostsController. I would like to 
extend it in the main app by adding and altering some methods. I have tried 
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 it 
possible to fix without modifying the engine?

Thanks

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