logger gem usage

gistfile1.rb

require 'logger'

# setup
$LOG = Logger.new("log_file_path")
$LOG.level = Logger::DEBUG

$LOG.debug "What ever you want to log"

# more elaborate, will log all params that
# go through your route/controller, use it 
# as helper method
def debug_on
  $LOG.debug("#{Time.now} - START")
  $LOG.debug("URL: #{request.url}")
  $LOG.debug("Params:")
  params.each do |k,v|
    $LOG.debug("#{k} => #{v}")
  end
end