Ruby Rails和Webscraping（Nokogiri）和Nitrous.io

Question

Can I use Rails and Nokogiri?

I tried this thread and have the same problem but the solutions dont work for me: Cannot require 'nokogiri' in Rails (but works in irb)

 class IndexController < ApplicationController
 require 'nokogiri'
    require 'open-uri'
  def index
    @name = "Help"


    end

end

Error I get is:

cannot load such file -- nokogiri

I am running this in nitrous.io. I did a list of gems using:

 <li>Ruby: <%=RUBY_VERSION%></li>
 <li>Gems: <%=`gem list`%></li>

Which gets me

    Ruby: 2.0.0
Gems: actionmailer (4.0.0) actionpack (4.0.0) activemodel (4.0.0) activerecord (4.0.0) activerecord-deprecated_finders (1.0.3) activesupport (4.0.0) arel (4.0.0) atomic (1.1.14) builder (3.1.4) bundler (1.3.5) coffee-rails (4.0.0) coffee-script (2.2.0) coffee-script-source (1.6.3) erubis (2.7.0) execjs (2.0.1) hike (1.2.3) i18n (0.6.5) jbuilder (1.5.1) jquery-rails (3.0.4) json (1.8.0) mail (2.5.4) mime-types (1.25) minitest (4.7.5) multi_json (1.8.0) polyglot (0.3.3) rack (1.5.2) rack-test (0.6.2) rails (4.0.0) railties (4.0.0) rake (10.1.0) rdoc (3.12.2) sass (3.2.10) sass-rails (4.0.0) sdoc (0.3.20) sprockets (2.10.0) sprockets-rails (2.0.0) sqlite3 (1.3.8) thor (0.18.1) thread_safe (0.1.3) tilt (1.4.1) treetop (1.4.15) turbolinks (1.3.0) tzinfo (0.3.37) uglifier (2.2.1)

Nokogiri is not here even though I have run a gem install nokogiri.

Answer 1

Add nokogiri to your gem file, run bundle install and start using it. There is no need for require

After bundle install, you can straight away use it in controller actions. eg

def index
 p = Nokogori::HTML(open('http://domain.com')) #=> p now have the contents of the page
end