使用Ruby深入研究JSON

我试图学习如何用Ruby解析JSON元素，但遇到了一个障碍

在下面的代码片段中，categories项返回数据，但如何访问它的子项？例如，在JSON响应中，我只想得到类别的标签值

JSON响应

{
    "title": "test",
    "updated": "2013-12-02T01:46:51.282Z",
    "startIndex": 1,
    "itemsPerPage": 1,
    "entries": [
        {
            "id": "fooURL",
            "title": "fooTitle",
            "updated": "2013-12-01T04:15:16Z",
            "published": "2013-11-30T21:49:58Z",
            "categories": [
                {
                    "term": "c706572879441004880dba7Fa5283c3e",
                    "scheme": "http://fooURL.com/id/",
                    "label": "Photo"
                },
                {
                    "term": "20DFCC087E4E10048925D0913B2D075C",
                    "scheme": "http://fooURL.com/id/",
                    "label": "NHL hockey "
                },
                {
                    "term": "20DE22407E4E100488FBD0913B2D075C",
                    "scheme": "http://fooURL.com/id/",
                    "label": "Professional hockey "
                }
            ]
        }
    ]
}

    require "rubygems"
    require "json"
    require "net/http"
    require "uri"

    uri = URI.parse("http://fooURL.com/v2/search/photo?q=Giroux&count=2&apikey=mykey")

    http = Net::HTTP.new(uri.host, uri.port)
    request = Net::HTTP::Get.new(uri.request_uri, {'Accept' => 'application/json'})

    response = http.request(request)
    result = JSON.parse(response.body[3..-1].force_encoding("UTF-8"))[ "entries" ]


    result.each do |item| 
      puts item["id"]
      puts item["title"]
      puts item["updated"]
      puts item['categories']
    end

代码

{
    "title": "test",
    "updated": "2013-12-02T01:46:51.282Z",
    "startIndex": 1,
    "itemsPerPage": 1,
    "entries": [
        {
            "id": "fooURL",
            "title": "fooTitle",
            "updated": "2013-12-01T04:15:16Z",
            "published": "2013-11-30T21:49:58Z",
            "categories": [
                {
                    "term": "c706572879441004880dba7Fa5283c3e",
                    "scheme": "http://fooURL.com/id/",
                    "label": "Photo"
                },
                {
                    "term": "20DFCC087E4E10048925D0913B2D075C",
                    "scheme": "http://fooURL.com/id/",
                    "label": "NHL hockey "
                },
                {
                    "term": "20DE22407E4E100488FBD0913B2D075C",
                    "scheme": "http://fooURL.com/id/",
                    "label": "Professional hockey "
                }
            ]
        }
    ]
}

    require "rubygems"
    require "json"
    require "net/http"
    require "uri"

    uri = URI.parse("http://fooURL.com/v2/search/photo?q=Giroux&count=2&apikey=mykey")

    http = Net::HTTP.new(uri.host, uri.port)
    request = Net::HTTP::Get.new(uri.request_uri, {'Accept' => 'application/json'})

    response = http.request(request)
    result = JSON.parse(response.body[3..-1].force_encoding("UTF-8"))[ "entries" ]


    result.each do |item| 
      puts item["id"]
      puts item["title"]
      puts item["updated"]
      puts item['categories']
    end

最后几行给出了字符串的3元素数组

'Photo'
'NHL hockey'
'Professional hockey'