Question

我在rails应用程序上有一个ruby，我使用bootstrap构建，在本地运行时看起来很棒：

enter image description here

我将我的代码提交到git上的master分支，然后推送到我的heroku master。当我访问我的heroku URL时，我得到了这个页面：

https://whats-on-today.herokuapp.com/

不太好。我可以看到有404错误：

 HTTP 404 - GET https://whats-on-today.herokuapp.com/assets/application-96ded6f70c682e6f9f3a1ae3eb283ae0.js 
whats-on-today.herokuapp.com/:16 

HTTP 404 - GET https://whats-on-today.herokuapp.com/assets/application-2b56caae7bd0b485593c1fca2397cc26.css

我不知道这些css文件是什么以及它们存在的原因。我的应用程序布局代码如下所示：

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title><%= content_for?(:title) ? yield(:title) : "DemoApp" %></title>
    <%= csrf_meta_tags %>

    <!-- Le HTML5 shim, for IE6-8 support of HTML elements -->
    <!--[if lt IE 9]>
      <script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.6.1/html5shiv.js" type="text/javascript"></script>
    <![endif]-->

    <%= stylesheet_link_tag "application", :media => "all" %>

    <!-- For third-generation iPad with high-resolution Retina display: -->
    <!-- Size should be 144 x 144 pixels -->
    <%= favicon_link_tag 'apple-touch-icon-144x144-precomposed.png', :rel => 'apple-touch-icon-precomposed', :type => 'image/png', :sizes => '144x144' %>

    <!-- For iPhone with high-resolution Retina display: -->
    <!-- Size should be 114 x 114 pixels -->
    <%= favicon_link_tag 'apple-touch-icon-114x114-precomposed.png', :rel => 'apple-touch-icon-precomposed', :type => 'image/png', :sizes => '114x114' %>

    <!-- For first- and second-generation iPad: -->
    <!-- Size should be 72 x 72 pixels -->
    <%= favicon_link_tag 'apple-touch-icon-72x72-precomposed.png', :rel => 'apple-touch-icon-precomposed', :type => 'image/png', :sizes => '72x72' %>

    <!-- For non-Retina iPhone, iPod Touch, and Android 2.1+ devices: -->
    <!-- Size should be 57 x 57 pixels -->
    <%= favicon_link_tag 'apple-touch-icon-precomposed.png', :rel => 'apple-touch-icon-precomposed', :type => 'image/png' %>

    <!-- For all other devices -->
    <!-- Size should be 32 x 32 pixels -->
    <%= favicon_link_tag 'favicon.ico', :rel => 'shortcut icon' %>

    <%= javascript_include_tag "application" %>
  </head>
  <body>

    <div class="navbar navbar-default navbar-static-top">
      <div class="container">
        <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-responsive-collapse">
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
        <a class="navbar-brand" href="#">DemoApp</a>
        <div class="navbar-collapse collapse navbar-responsive-collapse">
          <ul class="nav navbar-nav">
            <li><%= link_to "Link1", "/path1"  %></li>
            <li><%= link_to "Link2", "/path2"  %></li>
            <li><%= link_to "Link3", "/path3"  %></li>
          </ul>
        </div>
      </div>
    </div>

    <div class="container">
      <div class="row">
        <div class="col-lg-9">
          <%= bootstrap_flash %>
          <%= yield %>
        </div>
        <div class="col-lg-3">
          <div class="well sidebar-nav">
            <h3>Sidebar</h3>
            <ul class="nav nav-list">
              <li class="nav-header">Sidebar</li>
              <li><%= link_to "Link1", "/path1"  %></li>
              <li><%= link_to "Link2", "/path2"  %></li>
              <li><%= link_to "Link3", "/path3"  %></li>
            </ul>
          </div><!--/.well -->
        </div><!--/span-->
      </div><!--/row-->

      <footer>
        <p>&copy; Company 2014</p>
      </footer>

    </div> <!-- /container -->

  </body>
</html>

有人可以解释为什么部署到heroku时的代码如下所示：

enter image description here

Answer 1

在生产中使用gem for rails 4

gem 'rails_serve_static_assets', group: :production

或使用rails_12factor gem（这个gem添加了两个其他宝石rails_serve_static_assets和rails_stdout_logging）

gem 'rails_12factor', group: :production

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