ActiveRecord json serialization should respect as_json definition of included association

When I define an as_json override in Question, and provide it with an include for the associated profile, it does not use the as_json defined in the profile model.

class Question < ActiveRecord::Base
def as_json(opts={})

super(:only => [:text],
  :include => [:profile]
)

end end

class Profile < ActiveRecord::Base
def as_json(opts={})

 super({ :only => [:display_name], :methods => [:avatar] })

end end

This will output the question as json and for the profile association, just output its id field? The only workaround I have found is to not provide an as_json on the profile and duplicate its as_json attrs everywhere I want to include it in a rendering.