Adding Exception Logging In Rails For All Exceptions

logging.rb

class Exception
  alias real_init initialize

  def initialize(*args)
    real_init *args

    unless message == 'Resource temporarily unavailable - read would block' ||
      caller.any? { |c| c =~ /.*\/var\/www\/web\/shared\/vendor\/bundle\/ruby\/2\.0\.0\/bin\/rake:23:in/i }
      breaker = "------------------------------------------------------"
      Rails.logger.info breaker
      Rails.logger.info breaker
      Rails.logger.info self.class.name
      Rails.logger.info("MESSAGE: #{message}") unless message.nil?
      if backtrace.nil?
        Rails.logger.info "CALLER:\n" + caller.join("\n")
      else
        Rails.logger.info "BACKTRACE:\n" + backtrace.join("\n")
      end
      Rails.logger.info breaker
      Rails.logger.info breaker
    end
  end
end

where to put this file?