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TODAY I LEARNED

Better usage of Rails logger

Logging usefull data is a hard task, but there's one specific method that helps to improve the experience of logging actual useful information: tagged. It adds extra tags to the log message making it easy to debug:

Rails.logger.tagged('Super App') do
  Rails.logger.info('Log Message')
end

This will result in somethin like this:

[Super App] Log Message

If you can see, it prepends usefull information, you could add personalized data to trace logs, for example:

class ApplicationController << ActionController::Base
  around_action :add_logger_tags

  def add_logger_tags
    Rails.logger.tagged(logging_tags) do
      yield
    end
  end

  def logging_tags
    [
      "Request Id: #{request.id}",
      "Session Id: #{session.id}",
      current_user && "User id: #{current_user.id}"
    ]
end

And you will have super nice logs to read

Learned by Edwin Cruz on Mar 18, 2021

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