Rails - May 2006 - how to disable callback

How do I locally disable a callback from being performed?

My class has

class Keyword < ActiveRecord::Base

after_update :switch_versioned

    private
      # Callback used to warn the user that an updated record
      # has not been saved in the version table
      def switch_versioned
        logger.debug "coucou"
        self.versioned= false
      end


But another class has a method that sets

@keyword.versioned= true


so in this case I want to disable the callback... there is probably a 
better way to do it?

any help appreciated

Isabelle

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