Rails 4 images not loading on heroku

I have spent the better part of the day trying to get images to load on my heroku app. Everything I try works locally, but not after being deployed to heroku.

I have png files saved in the images folder under my assets. I am referencing these images with syntax in my css such as;

#signin {
  background: url(<%= asset_path 'sf.png' %>);
  background-size: 100%;
}

In heroku when I inspect the background the assets/sf.png link is there but when you click it it shows a broken image, suggesting it did not load properly.

I've tried toggling config.serve_static_assets = false in the production.rb file between true and false and neither works.

I also have

group :production do
  gem 'pg'
  gem 'rails_12factor'
end

Precompile is always successful.

Rails 4. Any ideas on what else to try?

I needed to combine several solutions to make this work, here is what I did:

Gemfile

gem 'rails_12factor', group: :production

in my Heroku console

heroku labs:enable user-env-compile -a yourapp

production.rb

config.serve_static_assets = true
config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect'
config.assets.compile = true

I didn't need to precompile the assets locally.

You need to do two things to resolve it. First, change these two lines from false to true in production.rb file.

      config.assets.compile = true
      config.assets.digest = true

Second, if you've syntax like this for your images

    background: url("imgo.jpg")

Change it to

     background: image-url("image.jpg")

I hope it does your job.

Another issue, I was having with this was that I was precompiling my assets locally, prior to loading it to heroku. This requires you to follow a different set of steps, which can be found below. If you precompile your assets locally, you must follow these steps or any updates you made to your assets folder will not be reflected in prod.

https://devcenter.heroku.com/articles/rails-asset-pipeline

RAILS_ENV=production bundle exec rake assets:precompile

commit and push to server.

I had a similar issue and I solved it with the following line in the custom.css.scss.. Tell me if this works for you.

background: image-url('sf.png')

Referencing the asset being done different ways depending if you are using ERB or Sass, see in the Ruby on Rails Guide.

I don't have the reputation to comment (yet) but it's important to note that the Heroku labs feature has been removed, so now you'll get a "No such feature: user-env-compile" error

More: https://github.com/Crowdtilt/CrowdtiltOpen/issues/251

Rails 4 images not loading on heroku

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