rails2.3.5中，

调用方法：
=begin
方法名：user_login
如果用户名密码相同，登录成功 将  session[:user_id] = @user.id将用户id存到session user_id中
否则登录失败
=end

  def user_login
    is_not_null
    @user_name=params[:qa_user_name]
    @pass_word=params[:qa_pass_word]
    @pwdsalt= QaUser.get_pwdsalt(@user_name)
    @qa_auto=params[:qa_auto]
    @userck=QaCookie.check_cookie(@pwdsalt)
    #if check_code ==1 && validate_password == 1
    begin
      #判断是否登录成功
      if check_code ==1 && validate_password == 1
        @qa_user_pass=QaUser.check_qa_user_login(@user_name,@pass_word)
        if @qa_user_pass.to_i == 1
          session[:user_id] = @qa_user_pass.id
          puts 'login_ok'
          puts session[:user_id]
          render :json=>{:lg=>{:msg =>"login_ok"}}.to_json

          #是否自动登录系统
          if @qa_auto.to_i==1 and @userck==1

            cookies[:smn_token]={:value=>@pwdsalt,:expires => Time.now + 7.days}
          else
            QaCookie.create(:qa_cookie_name=>@user_name,:qa_cookie_pwdsalt=>@pwdsalt)
            cookies[:smn_token]={:value=>@pwdsalt,:expires => Time.now + 7.days}
          end
        else
          session[:qa_user_id] = nil
          puts 'login_fail'
          render :json=>{:lg=>{:msg =>"login_fail"}}.to_json
        end
      end
    rescue Exception=>e
      puts e.message
    end
  end

调用该方法，出错如下：
错误信息：
Processing QaUserController#user_login (for 127.0.0.1 at 2010-06-18 16:19:56) [POST]
  Parameters: {"qa_auto"=>"0", "qa_pass_word"=>"fy123", "qa_cpass_word"=>"fy123", "authenticity_token"=>"ECNnc7Bv2JKUArGUzJ8VIuOhX1ynN7C2zYuW+PeWxf8=", "qa_check"=>"qjnf", "qa_user_name"=>"fyname"}
  SQL (0.0ms)   BEGIN
  QaUser Load (0.0ms)   SELECT * FROM `qa_users` WHERE (qa_users_name='fyname') LIMIT 1
  QaUser Columns (15.0ms)   SHOW FIELDS FROM `qa_users`
  SQL (0.0ms)   COMMIT
  QaCookie Load (0.0ms)   SELECT * FROM `qa_cookies` WHERE (qa_cookie_pwdsalt='ed4dc7aa7a4f85aeaf776ab471e779568217f97f4426358633b01c3111556103') LIMIT 1
  QaUser Load (0.0ms)   SELECT * FROM `qa_users` WHERE (qa_users_name = 'fyname') LIMIT 1
  QaCookie Columns (16.0ms)   SHOW FIELDS FROM `qa_cookies`
  SQL (0.0ms)   BEGIN
  QaCookie Create (0.0ms)   INSERT INTO `qa_cookies` (`qa_cookie_name`, `updated_at`, `qa_cookie_pwdsalt`, `created_at`) VALUES('fyname', '2010-06-18 08:19:57', 'ed4dc7aa7a4f85aeaf776ab471e779568217f97f4426358633b01c3111556103', '2010-06-18 08:19:57')
  SQL (32.0ms)   COMMIT
Completed in 1032ms (View: 16, DB: 63) | 200 OK [http://localhost/qa_user/user_login]
Fri Jun 18 16:19:57 +0800 2010: Read error: #<ArgumentError: wrong number of arguments (0 for 1)>
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2155:in `hash'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2155:in `[]'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2155:in `subclasses'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2156:in `subclasses'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2036:in `inject'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2156:in `each'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2156:in `inject'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2156:in `subclasses'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:406:in `reset_subclasses'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:63:in `cleanup_application'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/reloader.rb:17:in `close'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/handler/mongrel.rb:82:in `process'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:159:in `process_client'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:158:in `each'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:158:in `process_client'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:285:in `run'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:285:in `initialize'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:285:in `new'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:285:in `run'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:268:in `initialize'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:268:in `new'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:268:in `run'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/handler/mongrel.rb:34:in `run'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/commands/server.rb:111
D:/Ruby/ruby-1.8.6-p111/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
script/server:3错误信息：
Processing QaUserController#user_login (for 127.0.0.1 at 2010-06-18 16:19:56) [POST]
  Parameters: {"qa_auto"=>"0", "qa_pass_word"=>"fy123", "qa_cpass_word"=>"fy123", "authenticity_token"=>"ECNnc7Bv2JKUArGUzJ8VIuOhX1ynN7C2zYuW+PeWxf8=", "qa_check"=>"qjnf", "qa_user_name"=>"fyname"}
  SQL (0.0ms)   BEGIN
  QaUser Load (0.0ms)   SELECT * FROM `qa_users` WHERE (qa_users_name='fyname') LIMIT 1
  QaUser Columns (15.0ms)   SHOW FIELDS FROM `qa_users`
  SQL (0.0ms)   COMMIT
  QaCookie Load (0.0ms)   SELECT * FROM `qa_cookies` WHERE (qa_cookie_pwdsalt='ed4dc7aa7a4f85aeaf776ab471e779568217f97f4426358633b01c3111556103') LIMIT 1
  QaUser Load (0.0ms)   SELECT * FROM `qa_users` WHERE (qa_users_name = 'fyname') LIMIT 1
  QaCookie Columns (16.0ms)   SHOW FIELDS FROM `qa_cookies`
  SQL (0.0ms)   BEGIN
  QaCookie Create (0.0ms)   INSERT INTO `qa_cookies` (`qa_cookie_name`, `updated_at`, `qa_cookie_pwdsalt`, `created_at`) VALUES('fyname', '2010-06-18 08:19:57', 'ed4dc7aa7a4f85aeaf776ab471e779568217f97f4426358633b01c3111556103', '2010-06-18 08:19:57')
  SQL (32.0ms)   COMMIT
Completed in 1032ms (View: 16, DB: 63) | 200 OK [http://localhost/qa_user/user_login]
Fri Jun 18 16:19:57 +0800 2010: Read error: #<ArgumentError: wrong number of arguments (0 for 1)>
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2155:in `hash'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2155:in `[]'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2155:in `subclasses'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2156:in `subclasses'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2036:in `inject'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2156:in `each'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2156:in `inject'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2156:in `subclasses'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:406:in `reset_subclasses'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/dispatcher.rb:63:in `cleanup_application'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/actionpack-2.3.5/lib/action_controller/reloader.rb:17:in `close'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/handler/mongrel.rb:82:in `process'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:159:in `process_client'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:158:in `each'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:158:in `process_client'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:285:in `run'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:285:in `initialize'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:285:in `new'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:285:in `run'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:268:in `initialize'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:268:in `new'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/mongrel-1.1.5-x86-mswin32-60/lib/mongrel.rb:268:in `run'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/handler/mongrel.rb:34:in `run'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/commands/server.rb:111
D:/Ruby/ruby-1.8.6-p111/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
D:/Ruby/ruby-1.8.6-p111/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
script/server:3

调试发现 mongrel的 process_client(client)方法的
rescue Object => e
        STDERR.puts "#{Time.now}: Read error: #{e.inspect}"
        STDERR.puts e.backtrace.join("\n")
报错：
def process_client(client)
      begin
        parser = HttpParser.new
        params = HttpParams.new
        request = nil
        data = client.readpartial(Const::CHUNK_SIZE)
        nparsed = 0

        # Assumption: nparsed will always be less since data will get filled with more
        # after each parsing.  If it doesn't get more then there was a problem
        # with the read operation on the client socket.  Effect is to stop processing when the
        # socket can't fill the buffer for further parsing.
        while nparsed < data.length
          nparsed = parser.execute(params, data, nparsed)

          if parser.finished?
            if not params[Const::REQUEST_PATH]
              # it might be a dumbass full host request header
              uri = URI.parse(params[Const::REQUEST_URI])
              params[Const::REQUEST_PATH] = uri.path
            end

            raise "No REQUEST PATH" if not params[Const::REQUEST_PATH]

            script_name, path_info, handlers = @classifier.resolve(params[Const::REQUEST_PATH])

            if handlers
              params[Const::PATH_INFO] = path_info
              params[Const::SCRIPT_NAME] = script_name

              # From http://www.ietf.org/rfc/rfc3875 :
              # "Script authors should be aware that the REMOTE_ADDR and REMOTE_HOST
              #  meta-variables (see sections 4.1.8 and 4.1.9) may not identify the
              #  ultimate source of the request.  They identify the client for the
              #  immediate request to the server; that client may be a proxy, gateway,
              #  or other intermediary acting on behalf of the actual source client."
              params[Const::REMOTE_ADDR] = client.peeraddr.last

              # select handlers that want more detailed request notification
              notifiers = handlers.select { |h| h.request_notify }
              request = HttpRequest.new(params, client, notifiers)

              # in the case of large file uploads the user could close the socket, so skip those requests
              break if request.body == nil  # nil signals from HttpRequest::initialize that the request was aborted

              # request is good so far, continue processing the response
              response = HttpResponse.new(client)

              # Process each handler in registered order until we run out or one finalizes the response.
              handlers.each do |handler|
                handler.process(request, response)
                break if response.done or client.closed?
              end

              # And finally, if nobody closed the response off, we finalize it.
              unless response.done or client.closed?
                response.finished
              end
            else
              # Didn't find it, return a stock 404 response.
              client.write(Const::ERROR_404_RESPONSE)
            end

            break #done
          else
            # Parser is not done, queue up more data to read and continue parsing
            chunk = client.readpartial(Const::CHUNK_SIZE)
            break if !chunk or chunk.length == 0  # read failed, stop processing

            data << chunk
            if data.length >= Const::MAX_HEADER
              raise HttpParserError.new("HEADER is longer than allowed, aborting client early.")
            end
          end
        end
      rescue EOFError,Errno::ECONNRESET,Errno::EPIPE,Errno::EINVAL,Errno::EBADF
        client.close rescue nil
      rescue HttpParserError => e
        STDERR.puts "#{Time.now}: HTTP parse error, malformed request (#{params[Const::HTTP_X_FORWARDED_FOR] || client.peeraddr.last}): #{e.inspect}"
        STDERR.puts "#{Time.now}: REQUEST DATA: #{data.inspect}\n---\nPARAMS: #{params.inspect}\n---\n"
      rescue Errno::EMFILE
        reap_dead_workers('too many files')
      rescue Object => e
        STDERR.puts "#{Time.now}: Read error: #{e.inspect}"
        STDERR.puts e.backtrace.join("\n")
      ensure
        begin
          client.close
        rescue IOError
          # Already closed
        rescue Object => e
          STDERR.puts "#{Time.now}: Client error: #{e.inspect}"
          STDERR.puts e.backtrace.join("\n")
        end
        request.body.delete if request and request.body.class == Tempfile
      end

提示信息“ Read error: #<ArgumentError: wrong number of arguments (0 for 1)> 提示应该是少传入一个参数，但是代码那部分少传，user_login 正常的，未少传入参数，这是什么原因出错？如何解决该问题？