nokogiri xpath 属性 - 奇怪的结果 [英] nokogiri xpath attribute - strange results

问题描述

我有一堆字段，当我尝试运行时:

I have a bunch of fields and when I try to run:

src.xpath('//RECORD').each do |record|
tbegin = record.xpath('//FIELD/TOKEN')

tbegin 数组返回来自其他记录的字段.我已经检查过第一行是否为我提供了适当的记录"子树数组，但是对 tbegin 的下一次调用并没有将搜索限制为记录"子树.事实上，它始终返回record[0]的字段子树.

the tbegin array returns the fields from other records. I've checked that the first line is giving me the appropriate array of "record" subtrees, but the next call for tbegin doesn't limit the search to just the "record" subtree. In fact, it consistently returns the field subtree of record[0].

到目前为止，我已经通过使用:

Thus far, I've gotten around this by using:

tbegin = record.css('TOKEN')

但我想了解我做错了什么.

but I want to understand what I'm doing wrong.

推荐答案

问题是 xpath('//FIELD/TOKEN') 中的前导双斜线，它告诉 nokogiri 匹配节点不是相对于这个节点，而是跨越整个文档而不管位置.要相对于节点本身进行匹配，您必须删除双斜杠:

The problem is the leading double-slash in xpath('//FIELD/TOKEN'), which tells nokogiri to match nodes not relative to this node, but across the whole document regardless of location. To match relative to the node itself, you have to remove the double-slash:

tbegin = record.xpath('FIELD//TOKEN')

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