After installing jQuery on Rails (jRails) i noticed that the update task just kept overwriting my jquery.js with an older version. Effectively downgrading it…

So here is a real update task, execute it with rake update:jquery

  #lib/tasks/jquery.rake
  namespace :update do
    desc "Download recent jQuery javascripts to public/javascripts"
    task :jquery => :environment do
      puts "Downloading files..."
      files = {
        'jquery.js'=>'http://code.jquery.com/jquery-latest.min.js',
      }

      require 'open-uri'
      files.each do |local,remote|
        f = File.open "#{js_dir}/#{local}", 'w' do |f|
          f.write open(remote).read
        end
        puts "downloaded #{local} successfully."
      end
      puts "all files downloaded successfully."
    end

    def js_dir
      ActionView::Helpers::AssetTagHelper::JAVASCRIPTS_DIR
    end
  end

PS: If the bleeding edge breaks anything you can get your old version back by jrails:update:javascripts

The other jquery libaries(fx,ui) are missing atm, since i am just using jquery on its own. If you know an update site, please drop a comment.