monkey patch to allow filter parameters in a rails 2 app running ruby 2.1

ruby2.rb

module ActionController
    class Base
      def log_processing_for_parameters
        parameters = respond_to?(:filter_parameters, true) ? filter_parameters(params) : params.dup
        parameters = parameters.except!(:controller, :action, :format, :_method)

        logger.info "  Parameters: #{parameters.inspect}" unless parameters.empty?
      end
    end
  end