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How do you format the ruby logger?
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Since the logger library comes with Ruby, there's no need to install any gems or other libraries. To begin using the logger library, simply require 'logger' and create a new Logger object. Any messages written to the Logger object will be written to the log file.
If you want to change all the default logging for that specific model, you can simply use User. logger = Logger. new(STDOUT) or wherever you want to log to. In the same way, ActiveRecord::Base.
In a Rails app, logs are stored under the /log folder.
logger = Logger.new('nice.log') logger.formatter = proc do |severity, datetime, progname, msg| "NICE: #{msg}\n" end logger.info("I like cheese.") # nice.log: NICE: I like cheese. If you want to format only the time, you can easily do it with datetime_format and the standard format specification. For example, if you do:
# Set the logger: logger = Logger.new($stdout) logger.level = Logger::DEBUG logger.datetime_format = "%Y-%m-%d %H:%M:%S" logger.info("This is an info log...") logger.error("This is an error log...") You will end up with logs such as:
I, [2015-01-20 14:02:29#17329] INFO -- myProg: This is an info log... E, [2015-01-20 14:02:29#17329] ERROR -- myProg: This is an error log... If, instead, you want to completely customize your log, you can use logger.formatter. For example, if you do:
# Set the logger: logger = Logger.new($stdout) logger.level = Logger::DEBUG logger.formatter = proc do |severity, datetime, progname, msg| date_format = datetime.strftime("%Y-%m-%d %H:%M:%S") if severity == "INFO" or severity == "WARN" "[#{date_format}] #{severity} (#{progname}): #{msg}\n" else "[#{date_format}] #{severity} (#{progname}): #{msg}\n" end end logger.info("This is an info log...") logger.error("This is an error log...") You will end up with logs such as:
[2015-01-20 14:48:04] INFO (myProg): This is an info log... [2015-01-20 14:48:04] ERROR (myProg): This is an error log... If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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