#56 The Logger

最新推荐文章于 2024-07-17 22:21:46 发布

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本文介绍了一种日志记录的配置方法，并演示了如何在控制器中发送调试信息到日志。通过示例展示了如何在 Rails 应用中启用默认的日志记录器，并自定义消息格式。

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