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+---

+layout: post

+title: "Colorful logging in Rails 3.2"

+date: 2013-03-17 17:54

+comments: true

+categories: [rails]

+cover: /images/cover/avatar.png

+keywords: ruby on rails, ruby, rails, logger, formatting, colors

+description: Formate and colorize log output in Rails

+---

+

+The default Rails logger is really messy. Write somewhere ```logger.debug

+some_object.inspect``` and then for an hour search where the goddamn message is

+in a log file. Fortunately we can format and colorize ```logger``` output.

+

+Create ```config/initializers/log_formatting.rb``` file and paste this code:

+

+{% codeblock lang:ruby %}{% raw %}

+class ActiveSupport::BufferedLogger

+    def formatter=(formatter)

+        @log.formatter = formatter

+    end

+end

+

+class Formatter

+    SEVERITY_TO_COLOR_MAP   = {'DEBUG'=>'33', 'INFO'=>'0;37', 'WARN'=>'36', 'ERROR'=>'31', 'FATAL'=>'31', 'UNKNOWN'=>'37'}

+    USE_HUMOROUS_SEVERITIES = false

+

+    def call(severity, time, progname, msg)

+        formatted_severity = sprintf("%s","#{severity}")

+

+        formatted_time = time.strftime("%Y-%m-%d %H:%M:%S.") << time.usec.to_s[0..2].rjust(3)

+        color = SEVERITY_TO_COLOR_MAP[severity]

+

+        if msg.empty?

+            "\n"

+        else

+            "\033[0;37m#{formatted_time}\033[0m [#{formatted_severity}] \033[#{color}m#{msg.strip}\033[0m\n"

+        end

+    end

+

+end

+

+Rails.logger.formatter = Formatter.new

+{% endraw %}{% endcodeblock %}

+

+I found original code

+[here](http://cbpowell.wordpress.com/2012/04/05/beautiful-logging-for-ruby-on-rails-3-2/).

+I've just made small changes -- adjusted colors and formatting (and removed humorous

+stuff).

+

+This is how it looks in ```tail -f log/development.log```:

+{% img /images/rails-logger.png %}

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