gistfile1.rb

module ImportUtil
  module ClassMethods
    def inside_import?
      Thread.current[:inside_import]
    end

    def step_into_import
      t = Thread.current[:inside_import]
      begin
        Thread.current[:inside_import] = true
        yield
      ensure
        Thread.current[:inside_import] = t
      end
    end
  end

  def inside_import?
    self.class.inside_import?
  end

  # usage
  after_save :unless => :inside_import? do
    Rails.logger.debug("moro")
  end
end