Rails 7: How to properly configure ActiveStorage to serve images from a CDN while using variants?
I'm optimizing some code but I'm working on a Rails 7 application that uses ActiveStorage to manage image uploads... I've set up my application to save images to Amazon S3, and I'm now trying to serve these images through a CDN. The scenario arises when I want to generate variants of the images (like resizing or cropping) and still have them served from the CDN. I've set up ActiveStorage with the following configuration in `config/storage.yml`: ```yaml amazon: service: S3 access_key_id: <%= ENV['AWS_ACCESS_KEY_ID'] %> secret_access_key: <%= ENV['AWS_SECRET_ACCESS_KEY'] %> region: <%= ENV['AWS_REGION'] %> bucket: <%= ENV['S3_BUCKET'] %> url: https://<%= ENV['S3_BUCKET'] %>.s3.amazonaws.com ``` I can upload images successfully, and they are stored correctly in S3. However, when I try to generate a variant of an uploaded image like this: ```ruby image = user.avatar # ActiveStorage attachment variant = image.variant(resize: "100x100").processed ``` I get the following behavior when trying to access the variant URL: ``` ActiveStorage::FileNotFoundError: The file does not exist ``` I’ve also tried setting the `config.active_storage.service_urls_expire_in` option in `config/environments/production.rb` to ensure the URLs are publicly accessible: ```ruby config.active_storage.service_urls_expire_in = 1.hour ``` However, I am still having issues with the variants not being generated or served correctly from the CDN. I would expect the CDN to cache the generated variant, but it seems to not be recognizing them at all. I've searched for solutions and tried using the `rails active_storage:install` generator to ensure my migrations are up to date, but nothing has worked. Could someone clarify how to correctly set up ActiveStorage to generate and serve image variants through a CDN? Are there specific configurations or steps I might be missing? For context: I'm using Ruby on Linux. How would you solve this? I'm on Windows 11 using the latest version of Ruby.