Rails Installing jQuery UI

I wanted to install jQuery UI, in order to do that I coded this: Gemfile:

gem 'jquery-rails'
gem 'jquery-ui-rails'
gem 'jquery-datatables-rails'

/app/assets/javascipts/application.js

//= require jquery
//= require jquery_ujs
//= require jquery.ui.draggable
//= require jquery.ui.droppable
//= require jquery.ui.resizable

I don't want any jQuery styling so I didn't include any css files in the manifest. I only want these 3 interactions to be include.

After I had run: bundle install and bundle update commands, and restarted server, I got following error:

 couldn't find file 'jquery.ui.draggable' with type 'application/javascript'
Checked in these paths: 
  /old-time-turtle-app/app/assets/fonts
  /old-time-turtle-app/app/assets/images
  /old-time-turtle-app/app/assets/javascripts
  /old-time-turtle-app/app/assets/stylesheets
  /old-time-turtle-app/vendor/assets/javascripts
  /old-time-turtle-app/vendor/assets/stylesheets
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/browser-timezone-rails-1.0.1/app/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/jstz-rails3-plus-1.0.5/vendor/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/js_cookie_rails-2.1.4/vendor/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/browser-timezone-rails-1.0.1/app/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/nprogress-rails-0.2.0.2/app/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/nprogress-rails-0.2.0.2/app/assets/stylesheets
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/chartkick-2.2.4/app/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/chartkick-2.2.4/vendor/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/coffee-rails-4.1.1/lib/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/jquery-datatables-rails-3.4.0/app/assets/images
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/jquery-datatables-rails-3.4.0/app/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/jquery-datatables-rails-3.4.0/app/assets/media
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/jquery-datatables-rails-3.4.0/app/assets/stylesheets
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/jquery-ui-rails-6.0.1/app/assets/images
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/jquery-ui-rails-6.0.1/app/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/jquery-ui-rails-6.0.1/app/assets/stylesheets
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/jquery-rails-4.3.1/vendor/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/actioncable-5.0.5/lib/assets/compiled
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/turbolinks-source-5.0.3/lib/assets/javascripts
  /old-time-turtle-app/app/assets/fonts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/bootstrap-sass-3.3.7/assets/stylesheets
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/bootstrap-sass-3.3.7/assets/javascripts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/bootstrap-sass-3.3.7/assets/fonts
  /old-time-turtle-app/.gems/ruby/2.3.0/gems/bootstrap-sass-3.3.7/assets/images

It seems that it looks for these files and doesn't find them, do I need to include the .js files manually ?