Rails 3.1.x - image_tag doesn't use the precompiled file in production mode

Question

In my views I put :

<%= image_tag("coin.png") %>

My original image is put on :

app/assets/images/coin.png

But in production mode the html code generated by image_tag is :

<img alt="Coin" src="/assets/coin.png">

Instead of hitting precompiled assets :

coin-aba0e66819d64251cb3bb4bb29b26eb2.png

(and naturally I cant see the image).

I didn't forgot to precompile my assets.

and my environment/production.rb is :

  config.cache_classes = true                                                                                                                                                                                   
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true                                                                                                                                                               
  config.serve_static_assets = false                                                                                                                                                                                                              
  config.assets.compress = true                                                                                                                                                                                                
  config.assets.js_compressor  = :uglifier
  config.action_dispatch.x_sendfile_header = "X-Accel-Redirect"   

Thanks you a lot

Answer 1

I found it !!!!!!!

Add to your production.rb :

config.assets.digest = true

Answer 2

As stated in the latest part of this railscasts Rails 3.1 won't use ?hash cache expiring anymore. It will use an hash in the filename itself for assets. Don't know if for images is the same (haven't played with 3.1 yet), but it could be your issue.