jquery-ui gem：找不到导入文件或不可读：jquery-ui / autocomplete

在开发中，我无法弄清楚如何使jquery-ui gem变得可用。

我将gem包含在项目Gemfile中，类型为bundle install，更新app/assets/stylesheets/application.scss为以下一行：

@import "jquery-ui/autocomplete";

最后app/assets/javascripts/application.js有一行：

//= require jquery-ui/autocomplete

如https://github.com/joliss/jquery-ui-rails中所述，或多或少

当我尝试在开发中加载页面时，Rails抱怨说

File to import not found or unreadable: jquery-ui/autocomplete.
Load paths:
  /home/dm/contra/app/assets/images
  /home/dm/contra/app/assets/javascripts
  /home/dm/contra/app/assets/stylesheets
  /home/dm/contra/vendor/assets/javascripts
  /home/dm/contra/vendor/assets/stylesheets
  /home/dm/.rvm/gems/ruby-2.2.1/gems/jquery-rails-4.0.5/vendor/assets/javascripts
  /home/dm/.rvm/gems/ruby-2.2.1/gems/coffee-rails-4.1.0/lib/assets/javascripts
  /home/dm/.rvm/gems/ruby-2.2.1/gems/angularjs-rails-1.4.8/vendor/assets/javascripts
  /home/dm/.rvm/gems/ruby-2.2.1/gems/bootstrap-sass-3.3.6/assets/stylesheets
...

这是此机器上jquery-ui-gem的目录布局：

内容 ~/.rvm/gems/ruby-2.2.1/gems/jquery-ui-rails-5.0.5/

app  Gemfile  History.md  lib  License.txt  Rakefile  README.md VERSIONS.md

的内容 ~/.rvm/gems/ruby-2.2.1/gems/jquery-ui-rails-5.0.5/app/assets/javascripts/jquery-ui

accordion.js         datepicker-da.js     datepicker-fr-CH.js  datepicker-ka.js     datepicker-nn.js     datepicker-ta.js     effect-bounce.js     effect-transfer.js
autocomplete.js      datepicker-de.js     datepicker-fr.js     datepicker-kk.js     datepicker-no.js     datepicker-th.js     effect-clip.js       menu.js
button.js            datepicker-el.js     datepicker-gl.js     datepicker-km.js     datepicker-pl.js     datepicker-tj.js     effect-drop.js       mouse.js
core.js              datepicker-en-AU.js  datepicker-he.js     datepicker-ko.js     datepicker-pt-BR.js  datepicker-tr.js     effect-explode.js    position.js
datepicker-af.js     datepicker-en-GB.js  datepicker-hi.js     datepicker-ky.js     datepicker-pt.js     datepicker-uk.js     effect-fade.js       progressbar.js
datepicker-ar-DZ.js  datepicker-en-NZ.js  datepicker-hr.js     datepicker-lb.js     datepicker-rm.js     datepicker-vi.js     effect-fold.js       resizable.js
datepicker-ar.js     datepicker-eo.js     datepicker-hu.js     datepicker-lt.js     datepicker-ro.js     datepicker-zh-CN.js  effect-highlight.js  selectable.js
datepicker-az.js     datepicker-es.js     datepicker-hy.js     datepicker-lv.js     datepicker-ru.js     datepicker-zh-HK.js  effect.js            selectmenu.js
datepicker-be.js     datepicker-et.js     datepicker-id.js     datepicker-mk.js     datepicker-sk.js     datepicker-zh-TW.js  effect-puff.js       slider.js
datepicker-bg.js     datepicker-eu.js     datepicker-is.js     datepicker-ml.js     datepicker-sl.js     dialog.js            effect-pulsate.js    sortable.js
datepicker-bs.js     datepicker-fa.js     datepicker-it-CH.js  datepicker-ms.js     datepicker-sq.js     draggable.js         effect-scale.js      spinner.js
datepicker-ca.js     datepicker-fi.js     datepicker-it.js     datepicker-nb.js     datepicker-sr.js     droppable.js         effect-shake.js      tabs.js
datepicker-cs.js     datepicker-fo.js     datepicker-ja.js     datepicker-nl-BE.js  datepicker-sr-SR.js  effect.all.js        effect-size.js       tooltip.js
datepicker-cy-GB.js  datepicker-fr-CA.js  datepicker.js        datepicker-nl.js     datepicker-sv.js     effect-blind.js      effect-slide.js      widget.js

我在这里没能做什么？