Question

我一直在关注Michael Hartl出色的RoR教程，但我正在使用RoR 3.1。我是RoR 3.1的新手，需要有关资产管道的帮助。这是我的问题：

在继续讨论第5.3节之前，我想我想推进Heroku，看看事情是如何发展的。令我惊讶的是“GET /”导致错误500.在我的本地开发环境中一切都很好。然后我尝试在生产环境（rails s -e production）下运行我的本地sample_app。相同的结果，错误500：

Sprockets::Helpers::RailsHelper::AssetPaths::AssetNotPrecompiledError in Pages#home

Showing /Users/john/Projects/sample_app/app/views/layouts/_stylesheets.html.erb where line #4 raised:

blueprint/screen.css isn't precompiled

支持信息：

我把blueprint CSS目录放在vendor / assets / stylesheets下。

我按照Michael的第13.1.4节建议进行操作，并将以下内容作为我的app / views / layouts / application.html.erb：

<!DOCTYPE html>
<html>
  <head>
    <title><%= title %></title>
    <%= render 'layouts/stylesheets' %>
    <%= stylesheet_link_tag "application" %>
    <%= javascript_include_tag "application" %>
    <%= csrf_meta_tags %>
  </head>
  <body>
    <div class="container">
      <%= render 'layouts/header' %>
      <section class="round">
        <%= yield %>
      </section>
      <%= render 'layouts/footer' %>
    </div>
  </body>
</html>

app / views / layouts / _stylesheets.html.erb的内容：

<!--[if lt IE 9]>
<script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<%= stylesheet_link_tag 'blueprint/screen', :media => 'screen' %>
<%= stylesheet_link_tag 'blueprint/print',  :media => 'print' %>
<!--[if lt IE 8]><%= stylesheet_link_tag 'blueprint/ie' %><![endif]-->

我已运行bundle exec rake assets：precompile。

public / assets / manifest.yml的内容：

---
logo.png: logo-8e0a5ad292fbb13a2b07e68fa3995406.png
rails.png: rails-bd9ad5a560b5a3a7be0808c5cd76a798.png
blueprint/plugins/buttons/icons/cross.png: blueprint/plugins/buttons/icons/cross-2ebcd25368006d1b7b0c5b7d6b523ab3.png
blueprint/plugins/buttons/icons/key.png: blueprint/plugins/buttons/icons/key-55237526967cbcab3e8cfb12f0029d88.png
blueprint/plugins/buttons/icons/tick.png: blueprint/plugins/buttons/icons/tick-3f5fc1f52b505b93f88263e0432d25ce.png
blueprint/plugins/buttons/readme.txt: blueprint/plugins/buttons/readme-3ff7f5dbb0288d71f70682fdbe9d86ec.txt
blueprint/plugins/fancy-type/readme.txt: blueprint/plugins/fancy-type/readme-e7ed185d1a9f23256d418ab929b464d9.txt
blueprint/plugins/link-icons/icons/doc.png: blueprint/plugins/link-icons/icons/doc-b071fd74b88ff38cda8360a53f493013.png
blueprint/plugins/link-icons/icons/email.png: blueprint/plugins/link-icons/icons/email-28104e72b3418737d4b9b329c12ec358.png
blueprint/plugins/link-icons/icons/external.png: blueprint/plugins/link-icons/icons/external-ee6d976ddb80125fafe1a33c6f8aed10.png
blueprint/plugins/link-icons/icons/feed.png: blueprint/plugins/link-icons/icons/feed-59bc8604661681639d25cb7015a32c38.png
blueprint/plugins/link-icons/icons/im.png: blueprint/plugins/link-icons/icons/im-afeeb6e0b652c1edb1441bf0fb428596.png
blueprint/plugins/link-icons/icons/lock.png: blueprint/plugins/link-icons/icons/lock-d73c4b3b57ce72cb6dbd8b265507ff75.png
blueprint/plugins/link-icons/icons/pdf.png: blueprint/plugins/link-icons/icons/pdf-c4c543e5103a8516839a7846b91e1ac4.png
blueprint/plugins/link-icons/icons/visited.png: blueprint/plugins/link-icons/icons/visited-fb2370448bc4ea5d079e963a8c0d900b.png
blueprint/plugins/link-icons/icons/xls.png: blueprint/plugins/link-icons/icons/xls-5399729cd31dffc492a04b3805cd0be1.png
blueprint/plugins/link-icons/readme.txt: blueprint/plugins/link-icons/readme-42c02030199cd36a671d4b623cb4dc36.txt
blueprint/plugins/rtl/readme.txt: blueprint/plugins/rtl/readme-8d11bf76e19fb3fc7dbc6c2ddb54b92d.txt
blueprint/src/grid.png: blueprint/src/grid-973add038ed86febca85f03e8b35b94a.png
jquery-ui.min.js: jquery-ui-7e33882a28fc84ad0e0e47e46cbf901c.min.js
jquery.min.js: jquery-8a50feed8d29566738ad005e19fe1c2d.min.js
application.js: application-a552e1db33b8be6a42eedf1261916f3c.js
application.css: application-214e0c0742f20b334e8a7776e0a4c71d.css

我没有在manifest.yml中看到blueprint / screen.css。

我错过了什么？

Answer 1

来自http://guides.rubyonrails.org/asset_pipeline.html#precompiling-assets

如果要包含其他清单或单个样式表和JavaScript文件，可以将它们添加到预编译数组

这意味着在config / environments / production.rb中设置

config.assets.precompile += %w( blueprint/screen.css blueprint/print.css )

或catchall：

config.assets.precompile += %w( *.css *.js )

Answer 2

我在application.css文件中添加了对蓝图样式表的引用。这样，我不必更改布局来修改样式表，我只需要修改application.css文件，运行rake assets:precompile，然后重新启动webserver（如果webrick或类似的话）。

我的application.css目前看起来像这样：

/*
 * This is a manifest file that'll automatically include all the stylesheets available in this directory
 * and any sub-directories. You're free to add application-wide styles to this file and they'll appear at
 * the top of the compiled file, but it's generally better to create a new file per style scope.
 *= require_self
 *= require_tree ./blueprint
 *= require_tree . 
 */

Answer 3

如上所述，您可能希望在生产时预编译资产。如果您使用capistrano，您可以在代码更新后执行此操作：

require 'bundler/capistrano'

after 'deploy:update_code' do  
  run "cd #{release_path}; RAILS_ENV=#{rails_env} bundle exec rake assets:precompile"
end

Answer 4

根据我自己对这个问题的经验，我也正在阅读Michael Hartl的优秀RoR教程，我认为有一步可能会被遗漏......

bundle exec rake assets:precompile    
git add public/assets
git commit -m "vendor compiled assets"
git push heroku

我发现了here。

blueprint / screen.css未预编译

4 个答案: