What are some examples of using the Ruby logging gem?

What are some examples of using the Ruby logging gem?

The Ruby logging gem provides a flexible way to log messages in your application. Here are a few examples:

1. Basic Logging: You can create a logger and log messages at different levels:

   require 'logger'
   logger = Logger.new(STDOUT)
   logger.info('This is an info message')
   logger.error('This is an error message')
   

2. Logging to a File: You can log messages to a file instead of the console:

   logger = Logger.new('application.log')
   logger.warn('This is a warning message')
   

3. Custom Log Levels: You can define custom log levels:

   class MyLogger < Logger
     LEVELS = { debug: 0, info: 1, warn: 2, error: 3, fatal: 4 }
   end
   

Would you like to see more advanced examples or specific use cases?

Can you show me how to log exceptions?

Certainly! You can log exceptions using the Logger class by rescuing exceptions and logging them. Here's an example:

begin
  # Some code that may raise an exception
  raise 'An error occurred'
rescue => e
  logger.error("Exception: \\#{e.message}")
end

This will log the error message when an exception is raised. Would you like to know more about configuring the logger?

Yes, how can I configure the logger's format?

You can configure the logger's format by setting a custom formatter. Here's an example:

logger.formatter = proc do |severity, datetime, progname, msg|
  "[\\#{datetime}] \\#{severity}: \\#{msg}\\n"
end

This will format the log messages to include the timestamp and severity level. Would you like to explore more features of the logging gem?