instance method deep_munge

# File actionpack/lib/action_controller/log_subscriber.rb, line 56
    def deep_munge(event)
      debug do
        "Value for params[:#{event.payload[:keys].join('][:')}] was set "\
        "to nil, because it was one of [], [null] or [null, null, ...]. "\
        "Go to http://guides.rubyonrails.org/security.html#unsafe-query-generation "\
        "for more information."\
      end
    end