一个有趣的小500错误 [英] An interesting little 500 error

问题描述

heroku日志：

<$ p

我试图部署到Heroku并发生500个服务器错误。 $ p> 开始在### ##。###。###中获得/在2010-10-14 17:59:34 -0700
由WelcomeController处理＃index作为HTML
在layouts / index（2.3ms）内渲染welcome / index.html.erb
在3ms中完成

ActionView :: Template :: Error（无法转换零转换为字符串）：
5：< meta charset =utf-8>
6：< title> Hello< / title>
7：<％= stylesheet_link_tagglobal，home，：cache => true％>
app / controllers / welcome_controller.rb：5：在'index'中


然后尝试以生产模式启动本地服务器：

$ p code c：\ Sanj\ruby> rails server production
退出
C：/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/handler.rb：21：在`const_get'中：错误的常量名称生成（NameError ）来自C的
：/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/handler.rb：21：在`get'
从C：/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/server.rb：217：在`server'
从C：/ Sanj / Ruby192 /lib/ruby/gems/1.9.1/gems/railties-3.0.0/lib/rails/commands/server.rb:54:in`start'
from C：/ Sanj / Ruby192 / lib / ruby /gems/1.9.1/gems/railties-3.0.0/lib/rails/commands.rb:30:in`block in< top（required）>'
from C：/ Sanj / Ruby192 / lib / ruby​​ / gems / 1.9.1 / gems / railties-3.0.0 / lib / rails / commands.rb：27：在'tap'中
从C：/ Sanj / Ruby192 / lib / ruby​​ / gems / 1.9.1 /宝石/ railties-3.0.0 / lib中/导轨/commands.rb:27:in`< top（required）>'脚本/导轨中的
：6：'require'
脚本/导轨中：6：在< main> '

这些问题似乎高度相关 - 您是否知道问题可能出在这里？

非常感谢！

---

Welcome Controller＃index

  def索引
 render：layout => index
 end 
  

请告诉我是否可以提供更多信息。

---

解决方案

感谢你们的答案。发生此问题的原因是environments / production.rb中的serve_static_assets设置为false。这使系统能够找到明显导致'nil'的CSS文件。我尝试的另一个变化是从样式表中删除：cache => true。

解决方案

serve_static_assets

问题发生的原因是environments / production.rb中的serve_static_assets设置为 false 。通过更改此选项，系统可以找到试图转换为字符串的'nil'的CSS文件。我还删除了：cache => true ，并且结合起来，这解决了Heroku部署问题。

I just tried to deploy to Heroku and got a 500 server error.

heroku logs:

Started GET "/" for ##.##.###.### at 2010-10-14 17:59:34 -0700  
  Processing by WelcomeController#index as HTML
Rendered welcome/index.html.erb within layouts/index (2.3ms)
Completed   in 3ms

ActionView::Template::Error (can't convert nil into String):
5:   <meta charset="utf-8">
6:   <title>Hello</title>
7:   <%= stylesheet_link_tag "global", "home", :cache => true %>  
app/controllers/welcome_controller.rb:5:in `index'

I then tried to start my local server in production mode:

c:\Sanj\ruby>rails server production  
Exiting  
C:/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/handler.rb:21:in `const_get': wrong constant name production (NameError)  
from C:/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/handler.rb:21:in `get'
from C:/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/rack-1.2.1/lib/rack/server.rb:217:in `server'
from C:/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.0/lib/rails/commands/server.rb:54:in `start'
from C:/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.0/lib/rails/commands.rb:30:in `block in <top (required)>'
from C:/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.0/lib/rails/commands.rb:27:in `tap'
from C:/Sanj/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.0/lib/rails/commands.rb:27:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'

These issues seem highly related - do you know what the issue might be here?

Thanks very much!

---

Welcome Controller#index

def index 
  render :layout => "index"
end

Please tell me if I can supply any more information.

---

Solution

Thanks to you guys for your answers. The problem was occurring because serve_static_assets was set to false in environments/production.rb. This enabled the system to find the CSS files that were apparently causing the 'nil'. The other change I tried was removing :cache => true from the stylesheets.

解决方案

serve_static_assets

The problem was occurring because serve_static_assets was set to false in environments/production.rb. Changing this enabled the system to find the CSS files that were the 'nil' it was trying to convert into a String. I also removed :cache => true, and in combination, this solved the Heroku deployment problem.

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