Ruby logger formatter11/9/2023 ![]() You may change the date and time format via datetimeformat. ![]() The default format and a sample are shown below: Log format: SeverityID, DateTime pid SeverityLabel - ProgName: message. Let's set config.logger = ::Logger.new(STDOUT) in config/application.rb and then try following code. Log messages are rendered in the output stream in a certain format by default. For the setup, we need a SimpleFormatter object. Improvement is made on ActiveSupport:: Logger::SimpleFormatter, where it is a call method and is overloaded. log.debug 'day old, it will be renamed and a'. The first step is to develop that message formatter class. log Logger.new ( log.txt, daily ) log.debug 'Once the log becomes at least one'. So now we can configure Rails logger to not to be SimpleFomatter and go back to ruby's logger. Rails configuration has a means for providing a log message formatter instance to Rails. This problem can be solved by using config.logger.Ĭonfig.logger accepts a logger conforming to the interface of Log4r or the default Ruby Logger class.ĭefaults to an instance of ActiveSupport::Logger, with auto flushing off in production mode. If the message it is going to print is of class Exception then it prints backtrace also.In comparison SimpleFormatter just prints msg.inspect for objects of Exception class. Ruby logger's method has a special check for exception messages. The problem is that Rails's SimpleFormatter's call method is a bit dumb When exception object is passed to SimpleFormatter then msg.inspect is called and that's why we see the exception message without any backtrace. 10 11 def msg2str ( msg ) 12 case msgġ5 when : : Exception 16 " # )\n" < < 17 ( msg. 1 2 #Format = "%s, %5s - %s: %s\n" 3 def call ( severity, time, progname, msg ) 4 Format %, format_datetime ( time ), $$, severity, progname, 5 msg2str ( msg ) ] 6 end 7 8.
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