Using Rails to reference an image in CSS

My application on Heroku, built with Rails, features a striking image as the background on the landing page. Since Heroku's file system is read-only, I made the decision to store these images (selected randomly) on AWS S3.

In my .css(.scss) code, the relevant section looks like this (simplified):

html {
  background: image-url('#{image}.jpg') no-repeat center center fixed;
}

However, an issue has arisen where the app successfully displays the image in development but fails to do so in production (on Heroku). Upon examining the delivered .css file in the browser, it appears there might be an error:

html {
  background: url("8017416067_4f6f75f956_o.jpg") no-repeat center center fixed;
  -webkit-background-size: cover;
  background-size: cover;
}

It seems that despite using image-url, the hash is not being appended as expected. The filename for the image on S3 is

8017416067_4f6f75f956_o-058c92aeab457efe0625a777f203430d.jpg
.

Could you offer any suggestions or insight into what might be incorrect in my approach?

EDIT: I've observed that the .css files from my local machine reference the image with

/assets/8017416067_4f6f75f956_o.jpg
(without quotes), while the online version displays
"8017416067_4f6f75f956_o.jpg"
.

SOLVED: Without fully understanding why, suddenly everything started working. The final action I took was deleting the entire public/assets folder to allow Heroku to precompile the assets internally.

Answer №1

I encountered a similar issue when my production environment didn't append URLs with the necessary hash. This was because my *.css file hadn't been compiled for the production environment, leading to the website using the original file with unhashed URLs.

To troubleshoot, first check if the browser is displaying a compiled CSS file with the hashed name. If not, ensure that the uncompiled *.css file is included in the list of "compilable" files in

config/environments/production.rb
:

config.assets.precompile += %w( mystyles.css )

Learn more about precompiling assets using the Asset Pipeline here

Another possible reason could be that the compilation was done in the wrong environment (not for production). Run the following command on your server:

RAILS_ENV=production bundle exec rake assets:precompile

Note that Heroku typically runs this command automatically, but it's good to double-check just in case.

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