Use Rails.logger, not ActiveRecord::Base.logger

Because everybody is not using ActiveRecord. And the logger is not specific to it.

railties/guides/source/debugging_rails_applications.textile

@@ -127,8 +127,8 @@ Rails makes use of Ruby's standard +logger+ to write log information. You can al
 You can specify an alternative logger in your +environment.rb+ or any environment file:
 
 <ruby>
-ActiveRecord::Base.logger = Logger.new(STDOUT)
-ActiveRecord::Base.logger = Log4r::Logger.new("Application Log")
+Rails.logger = Logger.new(STDOUT)
+Rails.logger = Log4r::Logger.new("Application Log")
 </ruby>
 
 Or in the +Initializer+ section, add _any_ of the following
@@ -142,13 +142,13 @@ TIP: By default, each log is created under +Rails.root/log/+ and the log file na
 
 h4. Log Levels
 
-When something is logged it's printed into the corresponding log if the log level of the message is equal or higher than the configured log level. If you want to know the current log level you can call the +ActiveRecord::Base.logger.level+ method.
+When something is logged it's printed into the corresponding log if the log level of the message is equal or higher than the configured log level. If you want to know the current log level you can call the +Rails.logger.level+ method.
 
 The available log levels are: +:debug+, +:info+, +:warn+, +:error+, and +:fatal+, corresponding to the log level numbers from 0 up to 4 respectively. To change the default log level, use
 
 <ruby>
 config.log_level = Logger::WARN # In any environment initializer, or
-ActiveRecord::Base.logger.level = 0 # at any time
+Rails.logger.level = 0 # at any time
 </ruby>
 
 This is useful when you want to log under development or staging, but you don't want to flood your production log with unnecessary information.