class ActionController::LogSubscriber

def start_processing(event)
  return unless logger.info?
  payload = event.payload
  params = {}
  payload[:params].each_pair do |k, v|
    params[k] = v unless INTERNAL_PARAMS.include?(k)
  end
  format  = payload[:format]
  format  = format.to_s.upcase if format.is_a?(Symbol)
  format  = "*/*" if format.nil?
  info "Processing by #{payload[:controller]}##{payload[:action]} as #{format}"
  info "  Parameters: #{params.inspect}" unless params.empty?
end