诗歌rails之 Logger

关键字: Rails Logger

Rails在controller里自带了logger，我们可以用来做debug:

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

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

我们可以在environment.rb里配置Logger的消息格式:

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

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

我们还可以在environments/production.rb里配置log_level

config.log_level = :debug

config.log_level = :debug 

使用rake log:clear可以清空旧日志
在.irbrc里也可以设置Logger:

if ENV.include?('RAILS_ENV') && !Object.const_defined?('RAILS_DEFAULT_LOGGER')
  require 'logger'
  Object.const_set('RAILS_DEFAULT_LOGGER', Logger.new(STDOUT))
end

if ENV.include?('RAILS_ENV') && !Object.const_defined?('RAILS_DEFAULT_LOGGER') require 'logger' Object.const_set('RAILS_DEFAULT_LOGGER', Logger.new(STDOUT)) end 

这样在script/console里的Model操作就会直接in place显示在console里