如何使用Nokogiri获取通过子节点值搜索的XML节点的值？

Question

我需要使用Nokogiri Gem从下面的CodigoImovel == 6124-2中获取值。

<?xml version="1.0" encoding="UTF-8"?>
<Carga xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <Imoveis>
        <Imovel>
            <CodigoImovel>6124-2</CodigoImovel>
            <TipoImovel>Apartamento</TipoImovel>
            <SubTipoImovel>Apartamento Padrão</SubTipoImovel>
        </Imovel>
        <Imovel>
            <CodigoImovel>86765</CodigoImovel>
            <TipoImovel>Apartamento</TipoImovel>
            <SubTipoImovel>Apartamento Padrão</SubTipoImovel>
            <CategoriaImovel>Cobertura</CategoriaImovel>
        </Imovel>
        <Imovel>
            <CodigoImovel>981768</CodigoImovel>
            <TipoImovel>Casa</TipoImovel>
            <SubTipoImovel>Casa de Condomínio</SubTipoImovel>
            <CategoriaImovel>Térrea</CategoriaImovel>
        </Imovel>
        <Imovel>
            <CodigoImovel>357468</CodigoImovel>
            <TipoImovel>Casa</TipoImovel>
            <SubTipoImovel>Casa de Condomínio</SubTipoImovel>
            <CategoriaImovel>Térrea</CategoriaImovel>
        </Imovel>
        <Imovel>
            <CodigoImovel>587168</CodigoImovel>
            <TipoImovel>Comercial/Industrial</TipoImovel>
            <SubTipoImovel>Conjunto</SubTipoImovel>
            <CategoriaImovel>Comercial/Sala Padrão</CategoriaImovel>
        </Imovel>
    </Imoveis>
</Carga>

我使用它来获取值xml.xpath("//Carga//Imoveis//ImovelCodigoImovel='"+re_code+"'")，但它显示未定义的局部变量或方法`re_code‘for #我感谢您的帮助。谢谢!

Answer 1

我执行了以下操作，并可以自动获得所需的节点：

 require 'nokogiri'
 xml = Nokogiri::XML::Document.parse '<Carga 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Imoveis>
      <Imovel>
          <CodigoImovel>6124-2</CodigoImovel>
          <TipoImovel>Apartamento</TipoImovel>
          <SubTipoImovel>Apartamento Padrão</SubTipoImovel>
      </Imovel>
      <Imovel>
          <CodigoImovel>86765</CodigoImovel>
          <TipoImovel>Apartamento</TipoImovel>
          <SubTipoImovel>Apartamento Padrão</SubTipoImovel>
          <CategoriaImovel>Cobertura</CategoriaImovel>
      </Imovel>
      <Imovel>
          <CodigoImovel>981768</CodigoImovel>
          <TipoImovel>Casa</TipoImovel>
          <SubTipoImovel>Casa de Condomínio</SubTipoImovel>
          <CategoriaImovel>Térrea</CategoriaImovel>
      </Imovel>
      <Imovel>
          <CodigoImovel>357468</CodigoImovel>
          <TipoImovel>Casa</TipoImovel>
          <SubTipoImovel>Casa de Condomínio</SubTipoImovel>
          <CategoriaImovel>Térrea</CategoriaImovel>
      </Imovel>
      <Imovel>
          <CodigoImovel>587168</CodigoImovel>
          <TipoImovel>Comercial/Industrial</TipoImovel>
          <SubTipoImovel>Conjunto</SubTipoImovel>
          <CategoriaImovel>Comercial/Sala Padrão</CategoriaImovel>
      </Imovel>
  </Imoveis>
</Carga>' 

注意解析后和结尾的单引号。然后我做了这个

re_code = '6124-2'
xml.xpath("//Carga//Imoveis//Imovel[CodigoImovel='"+re_code+"']")

并返回第一个带有子节点的<Imovel>节点。虽然我不确定为什么你称它为re_code，但你的意思是在这里使用正则表达式吗？