无法在Rails 5中安装ActiveStorage

Question

使用此代码，我无法在rails中安装active_storage。

'C:\Sites\muse>rails active_storage:install'

  

我的Rails版本是5.1.7

我添加了

require "active_storage/engine"

到应用程序。rb

并添加

gem 'activestorage'

到Gemfile

我在终端上得到以下结果

rails aborted!
LoadError: cannot load such file -- active_storage/engine
C:/Sites/muse/config/application.rb:4:in `require'
C:/Sites/muse/config/application.rb:4:in `<top (required)>'
C:/Sites/muse/Rakefile:4:in `require_relative'
C:/Sites/muse/Rakefile:4:in `<top (required)>'
bin/rails:4:in `require'
bin/rails:4:in `<main>'
(See full trace by running task with --trace)