Xpath Nokogiri嵌套

Question

我正在为一个包含电脑游戏产品信息的附属程序处理一个大型XML文档。下面给出了一个例子。

<prod id="743854322">
    <pId>GS811CF</pId>
    <text>
        <name>Tour De France 2013</name>
        <desc>Platform: XBOX 360  Publisher: FOCUS HOME INTER  Genre: SPORTS  Supported Languages: English</desc>
    </text>
    <uri>
        <awTrack>http://www.awin1.com/pclick.php?p=743854322&amp;a=161542&amp;m=3026</awTrack>
        <awImage>http://images.productserve.com/preview/3026/743854322.jpg</awImage>
        <mLink>http://tracking.searchmarketing.com/click.asp?aid=520005430000038657</mLink>
        <mImage>http://images2.drct2u.com/content/images/products/gs/gs811/gs811_xb2to52.jpg</mImage>
    </uri>
    <price curr="GBP">
        <buynow>47.00</buynow>
        <delivery>3.99</delivery>
    </price>
    <cat>
        <awCatId>579</awCatId>
        <awCat>Video Games</awCat><mCat>Main Menu|Electricals|Gaming &amp;amp; Consoles|Video Games</mCat>
    </cat>
    <brand>
        <awBrandId>427</awBrandId>
        <brandName>Xbox 360</brandName>
    </brand>
</prod>

我想能够搜索这个文件的电脑游戏名称，相当于“2013年环法自行车赛”，也是在xbox“平台: XBOX 360”。

我尝试了几种xpath方法，但似乎无法完全实现我想要的结果。我在想你们会怎么做。

我试过了(这起作用..。但我不想用contains方法来表示“名称”)

result = file.xpath("//prod[contains(.,\"Tour De France 2013\") and contains(.,\"Platform: XBOX 360\")]")[0]
# => #<Nokogiri::XML::Element:0x2b6e23c name="prod" attributes=[#<Nokogiri::XML::Attr:0x2b6e19c name="id" value="743854322">] children=[#<Nokogiri::XML::Element:0x2b6db84 name="pId" children=[#<Nokogiri::XML::Text:0x2b6d850 "GS811CF">]>, #<Nokogiri::XML::Element:0x2b6d5d0 name="text" children=[#<Nokogiri::XML::Element:0x2b6d300 name="name" children=[#<Nokogiri::XML::Text:0x2b6d094 "Tour De France 2013">]>, #<Nokogiri::XML::Element:0x2b6ce14 name="desc" children=[#<Nokogiri::XML::Text:0x2b6cb1c "Platform: XBOX 360  Publisher: FOCUS HOME INTER  Genre: SPORTS  Supported Languages: English">]>]>, #<Nokogiri::XML::Element:0x2b6c680 name="uri" children=[#<Nokogiri::XML::Element:0x2b70334 name="awTrack" children=[#<Nokogiri::XML::Text:0x2b70078 "http://www.awin1.com/pclick.php?p=743854322&a=161542&m=3026">]>, #<Nokogiri::XML::Element:0x2b6fd94 name="awImage" children=[#<Nokogiri::XML::Text:0x2b6fb14 "http://images.productserve.com/preview/3026/743854322.jpg">]>, #<Nokogiri::XML::Element:0x2b6f81c name="mLink" children=[#<Nokogiri::XML::Text:0x2b6f510 "http://tracking.searchmarketing.com/click.asp?aid=520005430000038657">]>, #<Nokogiri::XML::Element:0x2b6f290 name="mImage" children=[#<Nokogiri::XML::Text:0x2b6efd4 "http://images2.drct2u.com/content/images/products/gs/gs811/gs811_xb2to52.jpg">]>]>, #<Nokogiri::XML::Element:0x2b6ebec name="price" attributes=[#<Nokogiri::XML::Attr:0x2b6eb74 name="curr" value="GBP">] children=[#<Nokogiri::XML::Element:0x2b7256c name="buynow" children=[#<Nokogiri::XML::Text:0x2b72274 "47.00">]>, #<Nokogiri::XML::Element:0x2b71f7c name="delivery" children=[#<Nokogiri::XML::Text:0x2b71d10 "3.99">]>]>, #<Nokogiri::XML::Element:0x2b717d4 name="cat" children=[#<Nokogiri::XML::Element:0x2b7152c name="awCatId" children=[#<Nokogiri::XML::Text:0x2b7125c "579">]>, #<Nokogiri::XML::Element:0x2b70ff0 name="awCat" children=[#<Nokogiri::XML::Text:0x2b70d84 "Video Games">]>, #<Nokogiri::XML::Element:0x2b70a64 name="mCat" children=[#<Nokogiri::XML::Text:0x2b707bc "Main Menu|Electricals|Gaming &amp; Consoles|Video Games">]>]>, #<Nokogiri::XML::Element:0x2b742cc name="brand" children=[#<Nokogiri::XML::Element:0x2b73fd4 name="awBrandId" children=[#<Nokogiri::XML::Text:0x2b73d54 "427">]>, #<Nokogiri::XML::Element:0x2b73a84 name="brandName" children=[#<Nokogiri::XML::Text:0x2b737c8 "Xbox 360">]>]>]>

于是我尝试(返回为零)：

result = file.xpath("//prod[contains(.,\"Platform: PS3\") and name = \Tour De France 2013\"]")[0]
#=> nil

我很难访问“名称”--我认为这可能是因为它嵌套得很深。但我不知道该怎么参考。

Answer 1

可以使用以下xpath检查具有名称和desc节点中特定文本的prod节点：

'//prod[text/name="Tour De France 2013" and text/desc[contains(text(), "Platform: XBOX 360")]]'

例如：

file.at_xpath('//prod[text/name="Tour De France 2013" and text/desc[contains(text(), "Platform: XBOX 360")]]')['id']
#=> "743854322"