How do I make link_to open external URLs in a new window?

Question

I need to convert a rails 2.3 site so that all external URLs open in a new window. I could go though every call to link_to and add :target => \'_blank\'

Answer 1

In the end I went with this, in an initialiser:

module ExternalLinksInNewTabs
  def new_tab_link_to *args, &block
    if block_given?
      options = args.first || {}
      html_options = args[1] || {}

      if options.is_a? String
        if ExternalLinksInNewTabs.is_external_link? @controller.request.host, options
          html_options[:target] = '_BLANK'
        end
      end

      same_tab_link_to options, html_options, &block
    else
      name = args.first
      options = args[1] || {}
      html_options = args[2] || {}

      if options.is_a? String
        if ExternalLinksInNewTabs.is_external_link? @controller.request.host, options
          html_options[:target] = '_BLANK'
        end
      end

      same_tab_link_to name, options, html_options
    end
  end

  def self.is_external_link? host, url
    host.sub! /^www\./, ''
    url =~ /^http/i && url !~ /^http:\/\/(www\.)?#{host}/i
  end
end

module ActionView
  module Helpers
    module UrlHelper
      include ExternalLinksInNewTabs

      alias_method :same_tab_link_to, :link_to
      alias_method :link_to, :new_tab_link_to
    end
  end
end