ruby 1.9 buffered logger -> encoding errors

I have the same problem, when SQL query contains UTF-8 characters, so my patch looks like this:

module ActiveSupport
  class 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.force_encoding('utf-8')
      auto_flush
      message
    end
  end
end

I made the same patch in my app. However to make it a bit prettier I used Encoding.default_external instead of hardcoding utf-8