使用 Nokogiri 插入和删除 XML 节点和元素 [英] Inserting and deleting XML nodes and elements using Nokogiri

问题描述

我想提取 XML 文件的一部分并记下我提取了该文件中的某些部分，例如此处提取了某些内容".

I want to extract parts of an XML file and make a note that I extracted some part in that file, like "here something was extracted".

我正在尝试用 Nokogiri 来做这件事，但似乎没有真正记录如何:

I'm trying to do this with Nokogiri, but it seems to not really be documented on how to:

1. 删除
的所有子元素
2. 更改该完整元素的inner_text

有什么线索吗?

推荐答案

Nokogiri 使这变得非常容易.以本文档为例，以下代码将查找所有维生素 标签，移除他们的孩子(以及孩子的孩子等)，并将他们的内部文字更改为已移除孩子":

Nokogiri makes this pretty easy. Using this document as an example, the following code will find all vitamins tags, remove their children (and the children's children, etc.), and change their inner text to say "Children removed.":

require 'nokogiri'

io = File.open('sample.xml', 'r')
doc = Nokogiri::XML(io)
io.close

doc.search('//vitamins').each do |node|
  node.children.remove
  node.content = 'Children removed.'
end

一个给定的 food 节点看起来像这样:

A given food node will go from looking like this:

<food>
    <name>Avocado Dip</name>
    <mfr>Sunnydale</mfr>
    <serving units="g">29</serving>
    <calories total="110" fat="100"/>
    <total-fat>11</total-fat>
    <saturated-fat>3</saturated-fat>
    <cholesterol>5</cholesterol>
    <sodium>210</sodium>
    <carb>2</carb>
    <fiber>0</fiber>
    <protein>1</protein>
    <vitamins>
        <a>0</a>
        <c>0</c>
    </vitamins>
    <minerals>
        <ca>0</ca>
        <fe>0</fe>
    </minerals>
</food>

为此:

<food>
    <name>Avocado Dip</name>
    <mfr>Sunnydale</mfr>
    <serving units="g">29</serving>
    <calories total="110" fat="100"/>
    <total-fat>11</total-fat>
    <saturated-fat>3</saturated-fat>
    <cholesterol>5</cholesterol>
    <sodium>210</sodium>
    <carb>2</carb>
    <fiber>0</fiber>
    <protein>1</protein>
    <vitamins>Children removed.</vitamins>
    <minerals>
        <ca>0</ca>
        <fe>0</fe>
    </minerals>
</food>

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