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Editorial Team
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Asked: 2026-05-22T15:15:30+00:00

For example, I’ve got this XML object: <PARENT> <ROW> <ID>1</ID> <INFO>1234</INFO> </ROW> <ROW> <ID>2</ID>

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For example, I’ve got this XML object:

<PARENT>
  <ROW>
    <ID>1</ID>
    <INFO>1234</INFO>
  </ROW>
  <ROW>
    <ID>2</ID>
    <INFO>4321</INFO>
  </ROW>
  <ROW>
    <ID>3</ID>
    <INFO>4444</INFO>
  </ROW>
</PARENT>

in a variable called rows.

xml = Nokogiri::XML(rows)

What I need is to retrieve whole ROW subtag searching by ID inside of the ID tag.

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1 Answer

  1. Editorial Team
    s = <<-EOS
<PARENT>
  <ROW>
    <ID>1</ID>
    <INFO>1234</INFO>
  </ROW>
  <ROW>
    <ID>2</ID>
    <INFO>4321</INFO>
  </ROW>
  <ROW>
    <ID>3</ID>
    <INFO>4444</INFO>
  </ROW>
</PARENT>
EOS

doc = Nokogiri::XML(s)
element = doc.xpath("//ROW[ID='2']")
p element.to_s
# => "<ROW>\n    <ID>2</ID>\n    <INFO>4321</INFO>\n  </ROW>"

    And if you want to refine the result to one specific node, add it to the end.

    s = <<-EOS
<PARENT>
  <ROW>
    <ID>1</ID>
    <INFO>1234</INFO>
  </ROW>
  <ROW>
    <ID>2</ID>
    <INFO>4321</INFO>
  </ROW>
  <ROW>
    <ID>3</ID>
    <INFO>4444</INFO>
  </ROW>
</PARENT>
EOS

doc = Nokogiri::XML(s)
element = doc.xpath("//ROW[ID='2']/INFO")
p element.to_s
# => "<INFO>4321</INFO>"
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