Rotate log files on production and staging

The code based on the logger Rails uses by default; as mentioned in the
Rails configuration guide:

> [the logger] defaults to an instance of ActiveSupport::TaggedLogging
> that wraps an instance of ActiveSupport::Logger which outputs a log to
> the log/ directory. You can supply a custom logger, to get full
> compatibility you must follow these guidelines:
>
> * To support a formatter, you must manually assign a formatter from
>   the config.log_formatter value to the logger.
> * To support tagged logs, the log instance must be wrapped with
>   ActiveSupport::TaggedLogging.
> * To support silencing, the logger must include
>   ActiveSupport::LoggerSilence module. The ActiveSupport::Logger class
>   already includes these modules.

config/environments/production.rb

@@ -87,6 +87,11 @@ Rails.application.configure do
   # Use default logging formatter so that PID and timestamp are not suppressed.
   config.log_formatter = ::Logger::Formatter.new
 
+  # Rotate logger
+  logger = ActiveSupport::Logger.new(config.default_log_file, "daily")
+  logger.formatter = config.log_formatter
+  config.logger = ActiveSupport::TaggedLogging.new(logger)
+
   # Use a different logger for distributed setups.
   # require "syslog/logger"
   # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new "app-name")

config/environments/staging.rb

@@ -86,6 +86,11 @@ Rails.application.configure do
   # Use default logging formatter so that PID and timestamp are not suppressed.
   config.log_formatter = ::Logger::Formatter.new
 
+  # Rotate logger
+  logger = ActiveSupport::Logger.new(config.default_log_file, "daily")
+  logger.formatter = config.log_formatter
+  config.logger = ActiveSupport::TaggedLogging.new(logger)
+
   # Use a different logger for distributed setups.
   # require "syslog/logger"
   # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new "app-name")