Rails - Mar 2014 - Is it possible to put association callbacks in -extensions?

I have a case, where I would like a Log event to take place each time an 
association is added or removed. This is currently implemented like this:

has_many :levels, 
  after_add: :log_adding_event,
  after_remove: :log_removing_event

def log_adding_event object
  Log.create(object, "adding")
end

def log_removing_event object
  Log.create(object, "removing")
end

The fact that the callbacks isn't aware of the association they'r
triggered
by. This means, that I need two separate methods to differentiate between 
adding and removing objects. 
I know that extending the association allows methods to know about all 
kinds of goodies about the proxy association, which brings me to my 
question: *Is it possible to move callbacks inside an association 
extension?* 

Cheers, 

Emil

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