missing fingerprints in asset paths

Question

We just deployed a Rails 3.1 app using the new asset pipeline. In Development everything looks fine, but in production all asset-images are missing. When deploying we followed the Ruby on Rails Edge Guide. As an example, a simple code snippet from our app:

asset_path "favicon.png", "images"

This generates in production:

/assets/favicon.png

But the fingerprint is missing (and therefore it is a deadlink on production). We already tried it without the "images", with image_tag instead. Nothing is working.

Additional Information:

• Rails Version 3.1.0

Already looked at and tried:

• https://github.com/rails/rails/issues/1209
• Rails 3.1 and Image Assets
• Rails 3.1 Asset Pipeline and Caching

Answer 1

The recent Railscast Episode #282 covered switching assets from 3.0 to 3.1 with asset pipeline. Have you already tried setting config.assets.digest = true in config/environments/production.rb?