Rails 4 image-path, image-url and asset-url no longer work in SCSS files

I just had this issue myself.3 points that will hopefully help:

• If you place images in your app/assets/images directory, then you should be able to call the image directly with no prefix in the path. ie. image_url('logo.png')
• Depending on where you use the asset will depend on the method. If you are using it as a background-image: property, then your line of code should be background-image: image-url('logo.png'). This works for both less and sass stylesheets. If you are using it inline in the view, then you will need to use the built in image_tag helper in rails to output your image. Once again, no prefixing <%= image_tag 'logo.png' %>
• Lastly, if you are precompiling your assets, run rake assets:precompile to generate your assets, or rake assets:precompile RAILS_ENV=production for production, otherwise, your production environment will not have the fingerprinted assets when loading the page.

Also for those commands in point 3 you will need to prefix them with bundle exec if you are running bundler.

Your first formulation, image_url('logo.png'), is correct. If the image is found, it will generate the path /assets/logo.png (plus a hash in production). However, if Rails cannot find the image that you named, it will fall back to /images/logo.png.

The next question is: why isn't Rails finding your image? If you put it in app/assets/images/logo.png, then you should be able to access it by going to http://localhost:3000/assets/logo.png.

If that works, but your CSS isn't updating, you may need to clear the cache. Delete tmp/cache/assets from your project directory and restart the server (webrick, etc.).

If that fails, you can also try just using background-image: url(logo.png); That will cause your CSS to look for files with the same relative path (which in this case is /assets).

I just found out, that by using asset_url helper you solve that problem.

asset_url("backgrounds/pattern.png", image)