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Mechanize でXpathをメソッドチェーンしたら一回目のatで絞り込んだはずの範囲以外を二回目に検索していた

Last updated at Posted at 2023-11-01
qiita.rb
page.at("//node[@class='class']")
    .search(%(//*[text()="text"]))

みたいな文でスクレイピングしてたとき、どうしても参照範囲がおかしいのを検証して見つけたのが、基準が分からないけどatで指定した場所以外からもsearchする現象。
残念ながらgemを調べるほどの能力がないのでto_htmlしたものをnokogiriでパースした。

qiita.rb
node =page.at("//node[@class='class']").to_html

doc = Nokogiri::HTML(node)
doc.xpath('//*[text()="text"]').each do |link|
  puts link.content
end

NokogiriではなくてMechanizeに渡してもいいだろうがNokogiri単体のほうが軽いし良いだろう。
もっといいやり方募集

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