在rails上的ruby中的Coffeescript编译错误 [英] Coffeescript compilation error in ruby on rails

问题描述

我正在使用coffeescript + ruby​​-on-rails。如果咖啡代码中存在语法问题，将coffeescript编译为纯JS会导致错误。在浏览器上运行应用程序时，我收到此错误：

以下是服务器日志中的条目，没办法表示实际导致语法错误的文件：

  ActionView :: Template :: Error（SyntaxError：[stdin]：25： 10：意外:)：
 4：< meta name =viewportcontent =width = device-width，initial-scale = 1.0> 
 5：< title><％= content_for？（：title）？ yield（：title）：Inmonarch Website％>< / title> 
 6：< meta name =descriptioncontent =<％= content_for？（：description）？yield（：description）：Inmonarch Website％>> 
 7：<％= stylesheet_link_tag'application'，media：'all'％> 
 8：<％= javascript_include_tag'application'％> 
 9：<％= csrf_meta_tags％> 
 10：< / head> 
 app / views / layouts / dashboard.html.erb：7：in`_app_views_layouts_dashboard_html_erb__3120053487817944018_56303120' 
 
 
 Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3 @ rails426 / gems / actionpack-4.2.6 / lib / action_dispatch / middleware / templates / rescues / _source.erb（7.4ms）
 Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426 /gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb(3.0ms）
呈现/home/vipin8169/.rvm/gems/ruby-2.2.3@rails426 /gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb(1.6ms）
呈现/home/vipin8169/.rvm/gems/ruby-2.2.3@rails426救援/布局中的/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb(25.5ms）
渲染/home/vipin8169/.rvm/gems/ruby-2.2 .3 @ rails426 / gems / web-console-2.3.0 / lib / web_console / templates / _markup.html.erb（0.3ms）
 Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3 @ rails426布局中的/gems/web-console-2.3.0/lib/web_console/templates/_inner_console_markup.html.erb / inlined_string（0.3ms）
渲染/home/vipin8169/.rvm/gems/ruby-2.2.3 @ rails426 / gems / web-console-2.3.0 / lib / web_console / templates / _prompt_box_markup.html.erb layouts / inlined_string（0.3ms）
 Rendered /home/vipin8169/.rvm/gems/ruby-2.2 .3 @ rails426 / gems / web-console-2.3.0 / lib / web_console / templates / style.css.erb layouts / inlined_string（0.3ms）
 Rendered /home/vipin8169/.rvm/gems/ruby布局/ javascript中的-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/console.js.erb(296.8ms）
渲染/home/vipin8169/.rvm/gems布局/ javascript（0.2ms）内的/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/main.js.erb 
渲染/home/vipin8169/.rvm /gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/error_page.js.erb layouts / javascript（0.3ms）
 Rendered / home / vipin8169 / .rvm /宝石/红宝石2.2.3 @ rails4 26 / gems / web-console-2.3.0 / lib / web_console / templates / index.html.erb（313.8ms）
  

PS： - 我知道语法错误是什么，我故意做出语法错误，以确定我是否能够在日志的帮助下跟踪错误，我不能。

解决方案

一种解决方法是在rails之外编译 .coffee 文件以获得一个体面的错误消息：

如果您还没有：

  npm i coffee-script -g 
  

然后在的父目录中。咖啡文件：

  coffee --output deleteme --compile。 
  

完成后，删除 deleteme 它创建的文件夹（仅在修复所有错误时创建）。这应该为您找到语法错​​误并告诉您确切的位置。

I am using coffeescript+ruby-on-rails. The compilation of coffeescript into pure JS leads to an error if there is a syntax problem in the coffee code. On the browser when I run the app, I get this error: ExecJS::RuntimeError

Is there any way to find out what caused the compilation error, when it was trying to compile coffee code to JS? Attached is a screenshot of the error

Following is the entry in the server log, which no way indicates the file which actually caused the syntax error:

ActionView::Template::Error (SyntaxError: [stdin]:25:10: unexpected :):
    4:     <meta name="viewport" content="width=device-width, initial-scale=1.0">
    5:     <title><%= content_for?(:title) ? yield(:title) : "Inmonarch Website" %></title>
    6:     <meta name="description" content="<%= content_for?(:description) ? yield(:description) : "Inmonarch Website" %>">
    7:     <%= stylesheet_link_tag 'application', media: 'all' %>
    8:     <%= javascript_include_tag 'application' %>
    9:     <%= csrf_meta_tags %>
   10:   </head>
  app/views/layouts/dashboard.html.erb:7:in `_app_views_layouts_dashboard_html_erb__3120053487817944018_56303120'


  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_source.erb (7.4ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (3.0ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.6ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (25.5ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/_markup.html.erb (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/console.js.erb within layouts/javascript (296.8ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/main.js.erb within layouts/javascript (0.2ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/index.html.erb (313.8ms)

PS:- I know what the syntax error is, I made the syntax error deliberately to find out if I am able to trace the error with the help of logs, which I couldn't.

解决方案

One workaround is to compile your .coffee files outside rails to get a decent error message:

If you don't yet have it:

npm i coffee-script -g

Then in a parent directory of your .coffee files:

coffee --output deleteme --compile .

When you're done, delete the deleteme folder it created (which is only created if you fix all the errors). This should find the syntax error for you and tell you exactly where it is.

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