Rails - image.png Isn't Precompiled

Question

I'm attempting to deploy a web application on Amazon's EC2 servers, and I have the code up on the server. Everything looks like it's working, but when I go to the home page, I get a 500 error message and the production.log file gives me the following error:

ActionView::Template::Error (image.png isn't precompiled)

• I've tried running rake assets:precompile,

• I've changed the line in config/environments/production.rb to config.assets.compile = true

• I've checked that the compiled image.png is in public/assets/manifest.yml

but I still get the same error.

I'm running Rails 3.2.6 and Ruby 1.8.7.

Thanks for your help!

Answer 1

Running rake assets:precompile RAILS_ENV=production should fix it. If you don't provide any RAILS_ENV, Rails assumes it's development

I believe that's because each env in the asset pipeline behaves differently. Therefore, as a general rule, in production, always run rake tasks with RAILS_ENV='production' and you should stay safe.

Answer 2

I am using Openshift from Redhat and when deployed on the server it RAKEs to the production environment automatically. I too had the same problem but only on the production server.

Performing the change:

config/environments/production.rb to config.assets.compile = true

worked a treat. There is another parameter in this file vou could change:

config.assets.precompile += %w[ *.png *.jpeg *.jpg *.gif ]

When deployed on the server you could then do manually:

rake RAILS_ENV=production

or if you are using a server like Openshift that deploys automatically, configurations in the production.rb file will be taken into account.

Answer 3

In config/application.rb add a line like:

config.assets.precompile += ['image.png']

Although, if its in public/assets/images you shouldn't have to.

Answer 4

Resolved - needed to run rake assets:precompile RAILS_ENV='production instead of just rake assets:precompile ...