ruby-on-rails - using input's value to find a rails object

Question

I want to grab an input's value in the html and use it in my ruby code like this. Any ideas?

<input type="hidden" id="useThis" value="1">

<% @user = User.find( <I want to grab the above input's value here>  ) %> 

Answer 1

这个带nokogiri的单线怎么样？这只是一个例子

require 'nokogiri'
s = '<input type="hidden" name="currentRackU" id="currentRackU" value="11">'
Nokogiri::XML.parse(s).root.attributes['id'].value # currentRackU

如果您没有安装 nokogiri，您可能需要运行 gem install nokogiri。在控制器而不是 erb 文件上编写这样的代码

<% @user = User.find( <I want to grab the above input's value here>  ) %>