如何使用Nokogiri在NodeSet中添加子节点

Question

我试图在根节点下添加子节点..我尝试了下面的xml,但这不起作用.我是Ruby和Nokogiri的新手

builder = Nokogiri::XML::Builder.with(@doc) do |xml|   
  nodes = Nokogiri::XML::NodeSet.new(@doc, [])   
  [].each {|nodes_one_by_one|  
    << nodes_one_by_one.Book  
    << nodes_one_by_one.Pen 
  }      
end  

我需要像这样在根节点下面添加节点

<Catalog>
    <Book>abc</Book>
    <Book_Author>Benjamin</Book_author>

这对我有用..但我真正需要的是在文档中的特定位置之后添加这些节点.

<Catalog>
    <!-- 
    <Book>abc</Book>
    <Book_Author>Benjamin</Book_author>
    -->
    <Interface></Interface>
    <Dialog></Dialog>
    <Manifest></Manifest>
</Catalog>

我尝试使用at_xpath('// Catlog'),但它在元素的末尾添加(如你所说)

 <Catalog>
    <Interface></Interface>
    <Dialog></Dialog>
    <Manifest></Manifest>
     <!-- 
      <Book>abc</Book>
      <Book_Author>Benjamin</Book_author>
     -->

book = Nokogiri::XML::Node.new('book', doc)
pen  = Nokogiri::XML::Node.new('pen', doc)     
.
.

无论如何使用"each"循环而不是逐个添加..我试过这种方式,但这不起作用.

builder = Nokogiri :: XML :: Builder.with(doc)do | xml |
nodes = Nokogiri :: XML :: Node.new(doc,[])
[] .each {| child_list_element |
child_list_element.Book"value"child_list_element.Pen"value"child_list_element.Diary"value"child_list_element.Pen_stand"value"child_list_element.Pencil"value"...
}
end
doc << nodes

代码可能是错误的,但我想这样做.还有一个就是..我可以将所有元素添加为NodeSet而不是Node.请更正我的代码.

提前致谢

---

1. 嵌套的OpenStruct似乎没有正常工作.我尝试了下面的例子

   商店目录集

   require 'ostruct'
   require 'nokogiri'
   
   collection = [
   OpenStruct.new(:catalogStoreNumber => '657758',
   :catalogStoreId => 'CTH6536',
   :catalogStoreLocation => 'UnitedStates', 
   :catalogOwnerId => 'TYCT11190',
   :catalogOwner => 'McGrawHill Pub.',
   :catalogList => OpenStruct.new(
       :catalogProductInfo => OpenStruct.new(
       :productType => 'Book',
       :productName => 'The Client',
       :productId => 'CRSUS113246A',
       :productCategory => 'Crime And Suspense',
       :productSubcategory => 'Vintage Books',  
       :productPrice => '45.50 USD',
       :productAuthor => OpenStruct.new(
               :authorFirstName =>'John Grisham',
       :authorMiddleName=> 'Willburt',
       :authorContact => '19876648981')),
   :catalogProductInfo => OpenStruct.new(
       :productType => 'Pen',
       :productName => 'Reynolds',
       :productId => 'PRREY546647',
       :productCategory => 'Misc. Stationary',
       :productSubcategory => 'Stationery Items',  
       :productPrice => '3.00 USD',
       :productManufacturer => 'Reynolds Inc.',
       :productAuthor => OpenStruct.new(
           :authorFirstName => 'Ryan Reynolds',
       :authorMiddleName => 'William',
       :authorContact => '16577589898')),
   :catalogListType => 'ProductCollection',
   :catalogListSource => 'Web'
   ),
   :catalogVerificaitionLog => OpenStruct.new(
       :catalogVerificationStatus => 'Verified',
   :catalogVerificationDateTime => '2012-03-12T13:00:15+5:30',
   :catalogVerificationId => '64774A',
   :catalogVerificationRequestedBy => 'user_121')
   )]
   

我想访问第一个"catalogProductInfo"的"productType",我说"collection.catalogList.catalogProductInfo.productType.content",我得到以下错误

"未定义的方法`productType'用于#(NoMethodError)

OpenStruct是否支持嵌套OpenStruct我想使用OpenStruct和Nokogiri以下面的格式构建XML？

<CatalogOrder>
    <CatalogStoreNumber>657758</CatalogStoreNumber>
    <CatalogStoreId>CTH6536</CatalogStoreId>
    <CatalogStoreLocation>UnitedStates</CatalogStoreLocation>
    <CatalogOwnerId>TYCT11190</CatalogOwnerId>
    <CatalogOwner>McGrawHill Pub.</CatalogOwner>
    <CatalogList>
        <CatalogProductInfo>
        <ProductType>Book</ProductType>
        <ProductName>The Client</ProductName>                          
        <ProductId>CRSUS113246A</ProductId>
        <ProductCategory>Crime And Suspense</ProductCategory>
        <ProductSubCategory>Vintage Books</ProductSubCategory>
        <ProductPrice>45.50 USD</ProductPrice>
        <ProductAuthor>
            <AuthorFirstName>John Grisham</AuthorFirstName>
        <AuthorMiddleName>Willbur</AuthorMiddleName>
        <AuthorContact>19876648981</AuthorContact>
        </ProductAuthor>
    </CatalogProductInfo>
    <CatalogProductInfo>
        <ProductType>Pen</ProductType>
        <ProductName>Reynolds</ProductName>                        
        <ProductId>PRREY546647</ProductId>
        <ProductCategory>Misc. Stationary</ProductCategory>
        <ProductSubCategory>Stationary Items</ProductSubCategory>
        <ProductPrice>3.00 USD</ProductPrice>
        <ProductAuthor>
        <AuthorFirstName>Ryan Reynolds</AuthorFirstName>
        <AuthorMiddleName>William</AuthorMiddleName>
        <AuthorContact>16577589898</AuthorContact>
        </ProductAuthor>
    </CatalogProductInfo>
    <CatalogListType>ProductCollection</CatalogListType>
    <CatalogListSource>Web</CatalogListSource>
</CatalogList>
<CatalogVerificationLog>
    <CatalogVerificationStatus>Verified</CatalogVerificationStatus>
    <CatalogVerificationDateTime>2012-03-12T13:00:15+5:30</CatalogVerificationDateTime>
    <CatalogVerificationId>64774A</CatalogVerificationId>
    <CatalogVerificationRequestedBy>User_121</CatalogVerificationRequestedBy>
</CatalogVerificationLog>

我想使用Nokogiri和OpenStruct实现这一点,但我不确定它是否可以使用OpenStruct,因为它缺乏嵌套功能.有没有其他方法可以使用JSon实现这一点而没有任何明显的限制？请更正我之前的代码.

Answer 1

如果我正确理解你,以下应该大致是你正在寻找的:

doc = Nokogiri::XML(original_xml_string) 

catalog = doc.at_css('Catalog') # #at_css will just grab the first node.
                                # use #css if you want to loop through several.
                                # alternatively just use doc.root

book = Nokogiri::XML::Node.new('Book', doc)
book_author = Nokogiri::XML::Node.new('Book_Author', doc)

book.content = 'abc'
book_author.content  = 'benjamin'

catalog << book
catalog << book_author

在<<刚刚元素结束前应追加的节点.

更新

在更新了问题并简化了@ Phrogz的建议之后,这应该符合您的要求:

require 'nokogiri'

xml = <<'XML'
<Catalog>
  <Interface></Interface>
  <Dialog></Dialog>
  <Manifest></Manifest>
</Catalog>
XML

doc = Nokogiri::XML(xml) 
catalog = doc.root

catalog.first_element_child.before("<Book_Author>abc</Book_Author>")
catalog.first_element_child.before("<Book>benjamin</Book>")

puts doc.to_xml

更新2

要迭代集合,动态添加节点,并使用NodeSet,请尝试以下操作:

require 'nokogiri'
require 'ostruct'

xml = <<-'XML'
<Catalog>
  <Interface></Interface>
  <Dialog></Dialog>
  <Manifest></Manifest>
</Catalog>
XML

collection = [
  OpenStruct.new(book: '1984', pen: 'George Orwell'),
  OpenStruct.new(book: 'Thinking, Fash and Slow', pen: 'Daniel Kahneman')
]

doc = Nokogiri::XML(xml) 
catalog = doc.root

node_set = Nokogiri::XML::NodeSet.new(doc)
collection.each do |object|
  book = Nokogiri::XML::Node.new('Book', doc)
  book_author = Nokogiri::XML::Node.new('Book_Author', doc)

  book.content = object.book
  book_author.content = object.pen

  node_set << book
  node_set << book_author
end

catalog.first_element_child.before(node_set)

puts doc.to_xml