拼音哈希parsed_response错误

Question

背景

我正在使用HTTParty来解析XML响应。不幸的是，当散列响应只有一个条目(？)时，产生的散列是不可索引的。我已经确认，对于单项和多项(？)，生成的XML语法是相同的。我还确认了当总是有多个条目(？)时，我的代码可以工作。在散列中。

问题

我如何适应单个散列条目的情况和/或有没有更容易的方法来完成我想要做的事情？

代码

require 'httparty'

  class Rest
    include HTTParty
    format :xml
  end


  def test_redeye
    # rooms and devices
    roomID = Hash.new
    deviceID = Hash.new { |h,k| h[k] = Hash.new }
    rooms = Rest.get(@reIp["theater"] + "/redeye/rooms/").parsed_response["rooms"]
    puts "rooms #{rooms}"   
    rooms["room"].each do |room|
        puts "room #{room}"
        roomID[room["name"].downcase.strip] = "/redeye/rooms/" + room["roomId"] 
        puts "roomid #{roomID}" 
        devices = Rest.get(@reIp["theater"] + roomID[room["name"].downcase.strip] + "/devices/").parsed_response["devices"]
        puts "devices #{devices}"
        devices["device"].each do |device|
            puts "device #{device}"
            deviceID[room["name"].downcase.strip][device["displayName"].downcase.strip] = "/devices/" + device["deviceId"] 
            puts "deviceid #{deviceID}"
        end
    end 
    say "Done"
  end   

XML -单项

<?xml version="1.0" encoding="UTF-8" ?>
<devices>
  <device manufacturerName="Philips" description="" portType="infrared" deviceType="0" modelName="" displayName="TV" deviceId="82" />
</devices>

XML -多个条目

<?xml version="1.0" encoding="UTF-8" ?>
<devices>
  <device manufacturerName="Denon" description="" portType="infrared" deviceType="6" modelName="Avr-3311ci" displayName="AVR" deviceId="77" />
  <device manufacturerName="Philips" description="" portType="infrared" deviceType="0" modelName="" displayName="TV" deviceId="82" />
</devices>

由此产生的错误

[Info - Plugin Manager] Matches, executing block
rooms {"room"=>[{"name"=>"Home Theater", "currentActivityId"=>"78", "roomId"=>"-1", "description"=>""}, {"name"=>"Living", "currentActivityId"=>"-1", "roomId"=>"81", "description"=>"2nd Floor"}, {"name"=>"Theater", "currentActivityId"=>"-1", "roomId"=>"80", "description"=>"1st Floor"}]}
room {"name"=>"Home Theater", "currentActivityId"=>"78", "roomId"=>"-1", "description"=>""}
roomid {"home theater"=>"/redeye/rooms/-1"}
devices {"device"=>[{"manufacturerName"=>"Denon", "description"=>"", "portType"=>"infrared", "deviceType"=>"6", "modelName"=>"Avr-3311ci", "displayName"=>"AVR", "deviceId"=>"77"}, {"manufacturerName"=>"Philips", "description"=>"", "portType"=>"infrared", "deviceType"=>"0", "modelName"=>"", "displayName"=>"TV", "deviceId"=>"82"}]}
device {"manufacturerName"=>"Denon", "description"=>"", "portType"=>"infrared", "deviceType"=>"6", "modelName"=>"Avr-3311ci", "displayName"=>"AVR", "deviceId"=>"77"}
deviceid {"home theater"=>{"avr"=>"/devices/77"}}
device {"manufacturerName"=>"Philips", "description"=>"", "portType"=>"infrared", "deviceType"=>"0", "modelName"=>"", "displayName"=>"TV", "deviceId"=>"82"}
deviceid {"home theater"=>{"avr"=>"/devices/77", "tv"=>"/devices/82"}}
room {"name"=>"Living", "currentActivityId"=>"-1", "roomId"=>"81", "description"=>"2nd Floor"}
roomid {"home theater"=>"/redeye/rooms/-1", "living"=>"/redeye/rooms/81"}
devices {"device"=>{"manufacturerName"=>"Philips", "description"=>"", "portType"=>"infrared", "deviceType"=>"0", "modelName"=>"", "displayName"=>"TV", "deviceId"=>"82"}}
device ["manufacturerName", "Philips"]
/usr/local/rvm/gems/ruby-1.9.3-p374@SiriProxy/gems/siriproxy-0.3.2/plugins/siriproxy-redeye/lib/siriproxy-redeye.rb:145:in `[]': can't convert String into Integer (TypeError)

Answer 1

我看到了几种选择。如果您控制端点，则可以通过将type="array"属性放在devices XML元素上来修改发送到accomodate HTTParty's underlying XML parser, Crack的XML。

否则，您可以在索引到设备之前检查设备是什么类：

case devices["device"]
when Array
  # act on the collection
else
  # act on the single element
end

每当您必须在动态语言中进行类型检查时，它都不太理想，因此，如果您发现自己多次执行此操作，那么引入多态性或至少提取一个方法来执行此操作可能是值得的。