Sprockets and rails-ujs：无法加载此类文件-coffee_script

Question

我正在使用不带咖啡轨的Rails，并使用Rails UJS（Ruby on Rails非侵入式脚本适配器）。升级到链轮4后，出现以下错误：

LoadError (cannot load such file -- coffee_script):

rails (976224b4de70) activesupport/lib/active_support/dependencies.rb:324:in `require'
rails (976224b4de70) activesupport/lib/active_support/dependencies.rb:324:in `block in require'
rails (976224b4de70) activesupport/lib/active_support/dependencies.rb:291:in `load_dependency'
rails (976224b4de70) activesupport/lib/active_support/dependencies.rb:324:in `require'
sprockets (4.0.0) lib/sprockets/autoload/coffee_script.rb:2:in `<top (required)>'

Answer 1

这是因为Rails UJS是用Coffee Script（https://github.com/rails/rails/tree/785427b88c01654a441b8a7ed602feb35358285b/actionview/app/assets/javascripts）编写的，因此您需要将coffee-rails gem与链轮一起使用。

如果无法使用咖啡架，则先迁移到webpacker，然后>

import Rails from "rails-ujs"
Rails.start()