ActionView::Template::Error ( isn't precompiled): - ruby-on-rails

Question

In production (Heroku), I'm getting the following error:
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
I'm running Rails 3.2.6, including actionpack 3.2.6 which I thought had this fix for this issue: https://github.com/rails/rails/commit/6bb86e1f3f7f9e11ee1c056d8742125173ecbce1
I also tried this: "ActionView::Template::Error ( isn't precompiled)" raised on "image_tag nil"
Basically, as long as one of the images on this page don't exist, it's throwing this error. If I upload the images, it works fine. Any ideas?
Thanks,
--Mark

Answer 1

I assume you're using something like CarrierWave to handle file uploads? You can specify a default image handler in your uploader class:
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
This will output the default image rather than trying to access a non-existent file called "" in the asset pipeline.