log caller in ActiveRecord log.rb

class ActiveRecord::ConnectionAdapters::AbstractAdapter
  def called_by(original_caller)
    str = original_caller.reject { |info| !info.match /#{Rails.root}/ }.first
    str.gsub(Rails.root,'')
  end
  
  def log_info(sql, name, ms)
    if @logger && @logger.debug?
      name = '%s (%.1fms) %s' % [name || 'SQL', ms, called_by(caller)]
      @logger.debug(format_log_entry(name, sql.squeeze(' ')))
    end
  end
end