Ruby Monkey Patched Logger在Rails控制台中不起作用

Question

I have some helper methods on my ActiveSupport::BufferedLogger such as displaying KeyValue pairs, it all works fine from rails s but fails in rails c

In rails s, I can see that my Logger extends BufferedLogger and that is the class I have chosen to MonkeyPatch, I have also tested this out with ActiveSupport::Logger as well.

I had thought that rails c ran through the same initializers that rails s used, am I wrong in thinking that?

Do I need to run some sort of initializer when starting rails c?

Location of my file is:

• config/initializers/active_support_logger.rb

Error is here:

Sample Snippet listed here

class ActiveSupport::BufferedLogger

    def kv(key, value)
        info('%-50s %s' % ["#{key}: ".brown, value])
    end

    def line
        info(@@l.brown)
    end

    def block(message)
        line
        info(message)
        line
    end

end

Answer 1

I recommend subclassing ActiveSupport::Logger (or ActiveSupport::BufferedLogger if you really want though it's deprecated in Rails 4) instead of monkey-patching. Rails provides a configuration option to override the logger instance used by the app. This works in any context that loads the Rails environment, including the server and console.

There are a number of ways you can do this; a quick and dirty way to get you started is to just define the class and set the logger instance in an initializer that will get loaded during the initialization process of the Rails environment:

# config/initializers/my_logger.rb

class MyLogger < ::ActiveSupport::Logger 
  # additional methods and overrides
end

Rails.logger = MyLogger.new(Rails.root.join("log", "#{Rails.env}.log"))

For more info, check out the Rails guide to debugging applications: http://guides.rubyonrails.org/debugging_rails_applications.html#the-logger