#56 The Logger

Learn all about the logger in this episode. See how to send messages to the log and how to customize it.

# ~/.irbrc
if ENV.include?('RAILS_ENV') && !Object.const_defined?('RAILS_DEFAULT_LOGGER')
  require 'logger'
  RAILS_DEFAULT_LOGGER = Logger.new(STDOUT)
end

# carts_controller.rb
def show
  @cart = current_cart
  logger.debug "Hello world! #{@cart.to_yaml}"
  # debug, info, warn, error, fatal
end

# environment.rb
Rails::Initializer.run do |config|
  config.active_record.colorize_logging = false
end

class Logger
  def format_message(level, time, progname, msg)
    "#{time.to_s(:db)} #{level} -- #{msg}\n"
  end
end

# environments/production.rb
config.log_level = :debug
config.logger = Logger.new(...) # or log4r