Question 1

How to set up S3DirectUpload with Rails 7?

Accepted Answer

The gem works with Rails 7, but you'll need to ensure jQuery is included in your asset pipeline, as it depends on jQuery File Upload. Follow the installation steps in the README, but note that CoffeeScript usage might require adaptation if you're using modern JavaScript bundlers like Webpacker.

Question 2

S3DirectUpload vs Active Storage for file uploads

Accepted Answer

S3DirectUpload is focused on direct client-side uploads to S3, reducing server load, while Active Storage handles uploads through the Rails server with more built-in processing and cloud service abstraction. Choose S3DirectUpload for performance-heavy uploads, but Active Storage for integrated Rails features like variants and direct uploads to multiple services.

Question 3

How to validate files before upload with S3DirectUpload?

Accepted Answer

You can use the `before_add` JavaScript callback to run custom validations on file objects before they're queued for upload. However, this is client-side only; for server-side validation, you'll need to implement checks in the Rails callback action after the S3 upload completes.

Question 4

Can I use S3DirectUpload without jQuery?

Accepted Answer

No, the gem is tightly coupled with jQuery and the jQuery File Upload plugin. The README shows that removing `s3_direct_upload` from assets requires manually including jQuery-file-upload scripts, making migration to vanilla JavaScript or other frameworks difficult.

Question 5

How to clean up old S3 uploads automatically?

Accepted Answer

The gem provides a rake task `s3_direct_upload:clean_remote_uploads` that uses the Fog gem to delete files older than a configurable prefix. Alternatively, you can set up S3 Lifecycle Configuration on your bucket for automated deletion, as mentioned in the README.

Question 6

Why am I getting CORS errors with S3DirectUpload?

Accepted Answer

This typically means your S3 bucket CORS settings are misconfigured. The README provides an example XML configuration; ensure the AllowedOrigin matches your domain in production, and that methods like POST and PUT are allowed, as direct uploads require these.

s3_direct_upload

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