module Kernel

def debugger

Starts a debugging session if the +debugger+ gem has been loaded (call rails server --debugger to do load it).
def debugger
  message = "\n***** Debugger requested, but was not available (ensure the debugger gem is listed in Gemfile/installed as gem): Start server with --debugger to enable *****\n"
  defined?(Rails.logger) ? Rails.logger.info(message) : $stderr.puts(message)
end