ruby rails 上的 Web 服务在升级到 rails 后无法正常工作 4.x

Question

前段时间，我已经使用 RoR v.3.2.13 编写了一个网络应用程序...... 所有这些都经过测试并正常工作了一段时间...... 现在，我要将所有环境更新到 rails 4.2.5！我在升级框架时发现了很多问题，在网上找了很多建议都几乎很容易地解决了！！

最后一个给我添麻烦了...

嗯，我需要将 .xml 流从掌上设备上传到服务器以更新一些数据库记录....

这是移动终端向服务器发送的.xml流的示例：

<?xml version="1.0" encoding="utf-8"?>
<readings>
 <reading>
  <opercode>a001a</opercode>
  <barcode>000073680</barcode>
  <opid>4</opid>
  <datetime>2012-01-22T00:07:34+01:00</datetime>
 </reading>
 <reading>
  <opercode>a001a</opercode>
  <barcode>000073679</barcode>
  <opid>4</opid>
  <datetime>2012-01-22T00:07:38+01:00</datetime>
 </reading>
</readings>

如您所见，它包含大量读数，每个读数包含四个字段。

以防无线连接无法正常工作，我构建了一个包含 html 表单和文件上传字段的视图....

控制器使用与您在此处看到的相同的操作接收流：

.........................
#
# receives the readings stream and passes it to the parser
def upload
  #
  # different part of code if request is from .html o .xml
  respond_to do |format|
    # the request is from .html page
    format.html do
      # checks the uploaded file 'content type'
      if params[:readings_file].instance_variable_get(:@content_type) == "text/xml"
        # the file is .xml
        # identifies the readings operator_id
        operator_id = Operator.find_by_code(params[:readings_file].instance_variable_get(:@original_filename)[0..4]).id
        # retrieves the number of readings stored into .xml file
        original_filename = params[:readings_file].instance_variable_get(:@original_filename).partition(".")[0]
        expected_readings = original_filename.partition("-P-")[2].to_i != 0 ? original_filename.partition("-P-")[2].to_i : original_filename.partition("--")[2].to_i
        # binds the temporary file for nokogiri parsing
        temp_file = File.open(params[:readings_file].instance_variable_get(:@tempfile))
        readings_to_be_loaded = Nokogiri::XML(temp_file)
        # parses the readings records
        result = parse_xml(readings_to_be_loaded, operator_id)
        # checks parsing result against expected readings count
        if result != expected_readings
          message = "WARNING - Inside .xml " + expected_readings.to_s + " records was present, only " + result.to_s + " has been accepted as valid readings!!"
        else
          message = "OK - .xml stream succesfully parsed!"
        end
      else
        # the file is not .xml
        message = "ERROR - Invalid readings file format detected --> 'not xml'!!"
      end
      logger.debug message
      redirect_to readings_path, :flash => {:message => message} and return
    end
    #
    # the request is from .xml stream
    format.xml  do
      if params[:readings].present?
        # determines the number of expected readings inside the stream and retrieves the operator code
        if params[:readings][:reading][0].nil?
          expected_readings = 1
          oper_code = params[:readings][:reading][:opercode]
        else
          expected_readings = params[:readings][:reading].count
          oper_code = params[:readings][:reading][0][:opercode]
        end
        # initializes the good readings counter
        readings_count = 0
        ........

        omissis

        ........
      else
        # the stream don't contains readings, return the http error code 406 -> 'Not Acceptable'
        logger.debug "ERROR - Readings file content is incorrectly formatted!!"
        render nothing: true, status: 406 and return
      end
    end
  end
  # not .xml request nor html upload
  # nothing has been processed, ingores the upload and returns status code 404 -> 'resource not found'
  logger.debug "ERROR - Incorrect data stream content"
  render :nothing => true, status: 404 and return
end
................

然后区分数据流是从 html 作为文件上传还是直接作为 .xml 流上传的操作。

现在，如果我使用 html 视图上传文件，一切正常（rails 3.2 或 4.2 都可以正常工作并解析读数）...

为了在终端上使用控制台模拟直接 .xml 上传操作，我使用此命令行：

curl -v -H "Content-Type: application/xml; charset=utf-8" --data-ascii @a001a-12115-81843-P-5.xml http://localhost:3000/readings/upload.xml

如果流直接使用.xml 格式上传...rails 3.2 运行正常，rails 4.2 returns “406 不可接受”（见提取日志行！）

日志来自 rails 3.2:

Started POST "/readings/upload.xml" for 127.0.0.1 at 2015-01-22 21:32:35 +0100
Processing by ReadingsController#upload as XML
  Parameters: {"readings"=>{"reading"=>[{"opercode"=>"a001a", "barcode"=>"000073685", "opid"=>"4", "datetime"=>"2015-01-21T20:18:20+01:00"}, {"opercode"=>"a001a", "barcode"=>"000073683", "opid"=>"4", "datetime"=>"2015-01-21T20:18:24+01:00"}, {"opercode"=>"a001a", "barcode"=>"000073682", "opid"=>"4", "datetime"=>"2015-01-21T20:18:28+01:00"}, {"opercode"=>"a001a", "barcode"=>"000073679", "opid"=>"4", "datetime"=>"2015-01-21T20:18:36+01:00"}, {"opercode"=>"a001a", "barcode"=>"000073683", "opid"=>"4", "datetime"=>"2015-01-21T20:18:41+01:00"}]}}
  Rendered text template (0.0ms)
Completed 200 OK in 49ms (Views: 48.2ms | ActiveRecord: 0.0ms)

日志来自 rails 4.2:

Started POST "/readings/upload.xml" for 127.0.0.1 at 2016-05-27 21:11:38 +0200
Processing by ReadingsController#upload as XML
ERROR - Readings file content is incorrectly formatted!!
  Rendered text template (0.0ms)
Completed 406 Not Acceptable in 2ms (Views: 0.2ms | ActiveRecord: 0.0ms)

似乎参数根本没有达到控制器的动作！！（我想这是由于对 4.2 版框架的某种限制，但我无法找到任何具体信息来证实或反驳我的怀疑）

请注意：如果我尝试使用掌上设备直接发送流，我会收到相同的响应！！

任何建议都被接受，

非常感谢大家... 弗朗切斯科

Answer 1

我已经解决了...

测试再测试.... 这不是问题！！

我发现当您在开发环境中启动 rails 时.... 它只监听本地主机地址，所以如果你需要测试应用程序与外部设备的交互，你需要明确地让它监听你的开发电脑 public ip 地址...

这是按照此处所述完成的：

现在数据到达网络服务并且 xml 流被正确处理！

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