Xpath Nokogiri Nested

Question

我正在为一个包含计算机游戏产品信息的附属程序处理一个大型XML文档。以下是整数的一个例子。

<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>

我希望能够在这个文档中搜索一个计算机游戏名称，它等于"环法自行车赛2013"，也在xbox"平台：xbox 360"上。

我用xpath做了一些尝试，但似乎没能达到我想要的效果。我想知道你们会怎么做。

我试过了（这很有效…但我不想使用"name"的contains方法）

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">]>]>]>

所以我尝试了（返回0）：

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

我很难访问"name"——我想这可能是因为它嵌套得很深。但我不知道如何引用它。

Answer 1

您可以使用以下xpath来检查名称和desc节点中是否有特定文本的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"