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rails / 5.1 / activesupport / taggedlogging.html

module ActiveSupport::TaggedLogging

Wraps any standard Logger object to provide tagging capabilities.

logger = ActiveSupport::TaggedLogging.new(Logger.new(STDOUT))
logger.tagged('BCX') { logger.info 'Stuff' }                            # Logs "[BCX] Stuff"
logger.tagged('BCX', "Jason") { logger.info 'Stuff' }                   # Logs "[BCX] [Jason] Stuff"
logger.tagged('BCX') { logger.tagged('Jason') { logger.info 'Stuff' } } # Logs "[BCX] [Jason] Stuff"

This is used by the default Rails.logger as configured by Railties to make it easy to stamp log lines with subdomains, request ids, and anything else to aid debugging of multi-user production applications.

Public Class Methods

new(logger) Show source 
# File activesupport/lib/active_support/tagged_logging.rb, line 59
def self.new(logger)
  # Ensure we set a default formatter so we aren't extending nil!
  logger.formatter ||= ActiveSupport::Logger::SimpleFormatter.new
  logger.formatter.extend Formatter
  logger.extend(self)
end

Public Instance Methods

flush() Show source 
# File activesupport/lib/active_support/tagged_logging.rb, line 72
def flush
  clear_tags!
  super if defined?(super)
end
Calls superclass method
tagged(*tags) { |self| ... } Show source 
# File activesupport/lib/active_support/tagged_logging.rb, line 68
def tagged(*tags)
  formatter.tagged(*tags) { yield self }
end

© 2004–2018 David Heinemeier Hansson
Licensed under the MIT License.