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copied!<p>Hehe ...The idea of Log4r comes from the famous "Log4j", which is my favorite logger in my java programming life. However log4r's doc is really poor, and it's really hard for newbies. Let me show my solution: </p> <p>Step1. create the log4r config file: (file name: config/log4r.yml)</p> <pre><code>log4r_config: # define all loggers ... loggers: - name : production level : WARN trace : 'false' outputters : - datefile - name : development level : DEBUG trace : 'true' outputters : - datefile # define all outputters (incl. formatters) outputters: - type: DateFileOutputter name: datefile dirname: "log" # notice the file extension is needed! # if you want the file is named by the process, just comment it, # then it will automatically get the same name with its process, # e.g. rails_2017-05-03.log filename: "my_app.log" formatter: date_pattern: '%H:%M:%S' pattern : '%d %l: %m ' type : PatternFormatter </code></pre> <p>step2. modify config/application.rb</p> <pre><code>require 'rails/all' # add these line for log4r require 'log4r' require 'log4r/yamlconfigurator' require 'log4r/outputter/datefileoutputter' include Log4r Bundler.require(:default, Rails.env) if defined?(Bundler) module Zurich class Application < Rails::Application #... # assign log4r's logger as rails' logger. log4r_config= YAML.load_file(File.join(File.dirname(__FILE__),"log4r.yml")) YamlConfigurator.decode_yaml( log4r_config['log4r_config'] ) config.logger = Log4r::Logger[Rails.env] end end </code></pre> <p>step3. add this line to your Gemfile.</p> <pre><code># which is the latest version and support "datefileoutputter" gem 'log4r', '1.1.9' </code></pre> <p>(if you are using Rails 4+, there still is step4: add this file to config/initializers folder</p> <pre><code># config/initializers/log4r_patch_for_rails4.rb class Log4r::Logger def formatter() end end </code></pre> <p>)</p> <p>It's done. Now "cd" into your Rails application folder, run "bundle" to install log4r, then "rails s", you will find the log files in "/log" folder like this: </p> <pre><code>May 9 17:05 rails_2011-05-09.log May 10 13:42 rails_2011-05-10.log </code></pre> <p>and the log content is( my favorite format ) : </p> <pre><code>$ tail log/rails_2011-05-10.log Started GET "/????_settings/19/edit" for 127.0.0.1 at ... 13:42:11 INFO: Processing by ????SettingsController ... 13:42:11 INFO: Parameters: {"id"=>"19"} 13:42:12 DEBUG: ????Setting Load (0.0ms) SELECT "d ... 13:42:12 INFO: Completed 200 OK in 750ms </code></pre> <p>My environment: </p> <ol> <li>OS: cygwin running in XP</li> <li>ruby 1.8.7 (2011-02-18 patchlevel 334) [i386-mingw32]</li> <li>rails: 3.0.5</li> <li>gem: 1.6.0</li> </ol> <p>Any question please let me know~ :-) </p> <p>refer to: <a href="https://stackoverflow.com/a/20154414/445908">https://stackoverflow.com/a/20154414/445908</a></p>

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