Rails 5.2 Active Storage: Previews, Poppler, and Solving Licensing Pitfalls

Rails 5.2 was just released last month with a major new feature: Active Storage. Active Storage provides file uploads and attachments for Active Record models with a variety of backing services (like AWS S3). While libraries like Paperclip exist to do similar work, this is the first time that such a feature has been shipped with Rails. At Heroku, we consider cloud storage a best practice, so we've ensured that it works on our platform. In this post, we'll share how we prepared for the release of Rails 5.2, and how you can deploy an app today using the new Active Storage functionality.

Trust but Verify

At Heroku, trust is our number one value. When we learned that Active Storage was shipping with Rails 5.2, we began experimenting with all its features. One of the nicest conveniences of Active Storage is its ability to preview PDFs and videos. Instead of linking to assets via text, a small screenshot of the PDF or Video will be extracted from the file and rendered on the page.

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