Question

如何替换Nokogiri文档中的属性值？我使用以下方法确定了相关属性：

doc.xpath("//pre[@class='text-results']").xpath("meta[@http-equiv='Content-Type']").attr("content").to_s

但是当我尝试为它分配一个不同的值时，我的Rails控制台中没有返回任何内容，这让我相信我做得不对：

2.3.0 :027 > doc.xpath("//pre[@class='text-results']").xpath("meta[@http-equiv='Content-Type']").attr("content") = "text/html; charset=iso8849";
2.3.0 :028 >

回答给出的答案时出错：

2.3.0 :005 > doc.xpath("//pre[@class='text-results']").xpath("meta[@http-equiv='Content-Type']")["content"] = "text/html; charset=iso8849"
NoMethodError: undefined method `[]=' for #<Nokogiri::XML::NodeSet:0x007f820271c628>
Did you mean?  []
from (irb):5
from /Users/davea/.rvm/gems/ruby-2.3.0/gems/railties-4.2.7.1/lib/rails/commands/console.rb:110:in `start'
from /Users/davea/.rvm/gems/ruby-2.3.0/gems/railties-4.2.7.1/lib/rails/commands/console.rb:9:in `start'
from /Users/davea/.rvm/gems/ruby-2.3.0/gems/railties-4.2.7.1/lib/rails/commands/commands_tasks.rb:68:in `console'
from /Users/davea/.rvm/gems/ruby-2.3.0/gems/railties-4.2.7.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /Users/davea/.rvm/gems/ruby-2.3.0/gems/railties-4.2.7.1/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'

我正在使用Rails 4.2.7。

Answer 1

尝试使用[]=方法

node["content"] = "text/html; charset=iso8849"

如果您想更新第一个

doc.xpath("//pre[@class='text-results']").xpath("meta[@http-equiv='Content-Type']").first["content"] = "text/html; charset=iso8849"

或每个节点

doc.xpath("//pre[@class='text-results']").xpath("meta[@http-equiv='Content-Type']").each { |node| node["content"] = "text/html; charset=iso8849" }

如何在我的Nokogiri文档中搜索和替换属性值？

1 个答案: