Heroku / Ruby-on-Rails error: image not precompiling

Question

I know that Heroku is running the rake assets:precompile task: ``` -----> Writing config/database.yml to read from DATABASE_URL -----> Preparing app for Rails asset pipeline Running: rake assets:precompile -----> Rails plugin injection Injecting rails_log_stdout Injecting rails3_serve_static_assets -----> Discovering process types Procfile declares types -> (none) Default types for Ruby/Rails -> console, rake, web, worker -----> Compiled slug size is 17.7MB -----> Launching... done ``` And I told it to precompile images in production.rb ``` # from: http://stackoverflow.com/questions/8052865/rails-3-1-asset-pipeline-why-my-images-do-not-precompile-for-production config.assets.precompile += %w[*.png *.jpg *.jpeg *.gif] ``` So why do I still get this 500 error? ``` 2012-05-29T02:57:15+00:00 app[web.1]: Started GET "/signin" for 46.114.68.16 at 2012-05-29 02:57:15 +0000 2012-05-29T02:57:15+00:00 app[web.1]: Processing by SessionsController#new as HTML 2012-05-29T02:57:15+00:00 app[web.1]:…

Accepted Answer

First, be sure you have this set as well:

```
config.assets.initialize_on_precompile = false
```

If that doesn't work, it's worth trying to manually run the precompile task before building the slug; I think there are subtle differences when done this way:

```
RAILS_ENV=production bundle exec rake assets:precompile
```

Last, it's not a solution, but if all else fails, a temporary workaround would be to set

```
config.assets.compile = true
```

Heroku / Ruby-on-Rails error: image not precompiling

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