Trace the origin of your Rails logging output

even_more_debugging_output.rb

class ActiveSupport::BufferedLogger

  def add(severity, message = nil, progname = nil, &block)
    return if @level > severity
    message = (message || (block && block.call) || progname).to_s
    # If a newline is necessary then create a new message ending with a newline.
    # Ensures that the original message is not mutated.
    message = "#{message}\n" unless message[-1] == ?\n
    buffer << message

    # <additional_debugging_output>
    if @level == DEBUG
      project_path = '/Users/cpetschnig/Projects' # increase readability
      ruby_lib_path_fragment = 'ruby-enterprise'  # just any significant part of the path to your installed gems
      buffer << caller.reject{|x| x.include?(ruby_lib_path_fragment) || x.starts_with?('script/rails') || x.include?('infopark_base_query_cache.rb')}[0,3].map{|x| " *** #{x.starts_with?(project_path) ? x.sub(project_path, '...') : x}\n"}.join
    end
    # </additional_debugging_output>

    auto_flush
    message
  end

end