Rails 4, How to log file with line Number

logging, ruby, ruby-on-rails, ruby-on-rails-4

Solution

You should not create a logger this way, there is the Ruby Logger class specifically for this. It provides good features, like level which will allow you to log messages with different methods, and you just need to change the level of the logger to hide some messages. For example, as a developer you need some messages that you want to debug the app, but you don't want those messages to appear in the production version. So while you're in development you make the level `Logger::DEBUG`, and use `debug` method to log those messages, and when you put the app on production you just change the Logger level to Logger::INFO, which will not write messages added with the `debug` method.

   log_file = Logger.new("#{Rails.root}/log/log_file.log", "w")
   log_file.level = Logger::INFO # this will print the messages added with info, fatal, warn, error and unknown methods
   # but will hide those added with the debug method
   begin
     number_of_row = 8000
     process_page = args[:page].to_i
     conn_url = CONNECTION_URL
     xml_page = Nokogiri::XML(open(conn_url)) 

     root = xml_page.css("root")      
     if root.css("code").text != "0000" 
        log_file.info "#{__LINE__} #{'-' * 30}"
        log_file.info "Parse Error : #{conn_url},\n code :  #{root.css("code").text}, \n msg: #{root.css("message").text} "
        log_file.info "-" * 30
     end
   rescue => e
     log_file.fatal "#{__LINE__} #{'-' * 30}\n\n"
   end

Problem

Original source

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