ruby-on-rails - ActionView::Template::Error(未预编译):

Question

在生产环境(Heroku)中，出现以下错误:

Started GET "/articles/1" for 50.134.181.231 at 2012-06-17 00:37:35 +0000
2012-06-17T00:37:35+00:00 app[web.1]: ActionView::Template::Error ( isn't precompiled):
2012-06-17T00:37:35+00:00 heroku[router]: GET wandr.com/articles/1 dyno=web.1 queue=0 wait=0ms service=497ms status=500 bytes=728
2012-06-17T00:37:35+00:00 app[web.1]: 
2012-06-17T00:37:35+00:00 app[web.1]:     74:   = image_tag @article.featured_photo_url(:sm).to_s
2012-06-17T00:37:35+00:00 app[web.1]:     75: 
2012-06-17T00:37:35+00:00 app[web.1]:     77:   = image_tag @article.background_photo_url(:md).to_s
2012-06-17T00:37:35+00:00 app[web.1]:     76: %p
2012-06-17T00:37:35+00:00 app[web.1]:     78: %p
2012-06-17T00:37:35+00:00 app[web.1]:     79:   = image_tag @article.cover_photo_url(:md).to_s
2012-06-17T00:37:35+00:00 app[web.1]:     80: 
2012-06-17T00:37:35+00:00 app[web.1]:   app/views/articles/show.html.haml:77:in `_app_views_articles_show_html_haml__1847247375488199378_48105500'
2012-06-17T00:37:35+00:00 app[web.1]: 
2012-06-17T00:37:35+00:00 app[web.1]:   app/controllers/articles_controller.rb:21:in `show'
2012-06-17T00:37:35+00:00 app[web.1]: 
2012-06-17T00:37:35+00:00 app[web.1]: Processing by ArticlesController#show as HTML
2012-06-17T00:37:35+00:00 app[web.1]:   Rendered articles/show.html.haml within layouts/admin (420.5ms)
2012-06-17T00:37:35+00:00 app[web.1]:   Parameters: {"id"=>"1"}
2012-06-17T00:37:35+00:00 app[web.1]: Completed 500 Internal Server Error in 486ms

我正在运行Rails 3.2.6，包括actionpack 3.2.6，我认为此问题已解决: https://github.com/rails/rails/commit/6bb86e1f3f7f9e11ee1c056d8742125173ecbce1

我也尝试过这个: "ActionView::Template::Error ( isn't precompiled)" raised on "image_tag nil"

基本上，只要此页面上的图像之一不存在，就会引发此错误。如果我上传图像，则效果很好。有任何想法吗？

谢谢，
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Answer 1

我假设您正在使用类似CarrierWave的工具来处理文件上传？您可以在您的上载器类中指定默认的图像处理程序:

https://github.com/jnicklas/carrierwave#providing-a-default-url

class MyUploader < CarrierWave::Uploader::Base
  def default_url
    "/images/fallback/" + [version_name, "default.png"].compact.join('_')
  end
end

这将输出默认图像，而不是尝试访问 Assets 管道中不存在的名为“”的文件。