[Rails 6 alpha] Sprockets::FileNotFound

[Kiran Patil]

Steps to reproduce

1. Create Rails 6 app
2. yarn add onsenui
3. Add below lines to "app/assets/stylesheets/application.css"

     *= require onsenui/css/onsenui
     *= require onsenui/css/onsen-css-components

4. Create a sample view as below

<ons-page>
  <div style="text-align: center; margin-top: 30px;">
    <p>
      <ons-input id="username" modifier="underbar" placeholder="Username" float></ons-input>
    </p>
    <p>
      <ons-input id="password" modifier="underbar" type="password" placeholder="Password" float></ons-input>
    </p>
    <p style="margin-top: 30px;">
      <ons-button onclick="login()">Sign in</ons-button>
    </p>
  </div>
</ons-page>

5. Access that page

Expected behavior

Page should render without error.

Actual behavior

$ rails s
=> Booting Puma
=> Rails 6.0.0.alpha application starting in development
=> Run rails server --help for more startup options
Puma starting in single mode...

• Version 3.12.0 (ruby 2.5.3-p105), codename: Llamas in Pajamas
• Min threads: 5, max threads: 5
• Environment: development
• Listening on tcp://0.0.0.0:3000
  Use Ctrl-C to stop
  Started GET "/pages/auth" for 127.0.0.1 at 2019-01-02 12:17:55 +0530
  (5.7ms) SELECT sqlite_version(*)
  Processing by PagesController#auth as HTML
  Rendering pages/auth.html.erb within layouts/application
  Rendered pages/auth.html.erb within layouts/application (Duration: 2.9ms | Allocations: 350)
  Completed 500 Internal Server Error in 377ms (ActiveRecord: 0.0ms | Allocations: 287951)

ActionView::Template::Error (couldn't find file 'onsenui/css/onsenui' with type 'text/css'
Checked in these paths:
/home/smitha/Documents/kiran/fooapp/app/assets/config
/home/smitha/Documents/kiran/fooapp/app/assets/images
/home/smitha/Documents/kiran/fooapp/app/assets/stylesheets
/home/smitha/Documents/kiran/rails/actioncable/app/assets/javascripts
/home/smitha/Documents/kiran/rails/activestorage/app/assets/javascripts
/home/smitha/Documents/kiran/rails/actionview/app/assets/javascripts
/home/smitha/.rvm/gems/ruby-2.5.3/gems/turbolinks-source-5.2.0/lib/assets/javascripts):
5: <%= csrf_meta_tags %>
6: <%= csp_meta_tag %>
7:
8: <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
9: <%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
10:
11:

app/assets/stylesheets/application.css:14
app/views/layouts/application.html.erb:8