amazon s3 - How to retrieve attachment url with Rails Active Storage with S3

Question

rails version 5.2

I have a scenario where I need to access the public URL of Rails Active Storage with Amazon S3 storage to make a zip file with Sidekiq background job.

I am having difficulty getting the actual file URL. I have tried rails_blob_url but it gives me following

http://localhost:3000/rails/active_storage/blobs/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBBZUk9IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--9598613be650942d1ee4382a44dad679a80d2d3b/sample.pdf

How do I access the real file URL through Sidekiq?

storage.yml

test:
  service: Disk
  root: <%= Rails.root.join("tmp/storage") %>

local:
  service: Disk
  root: <%= Rails.root.join("storage") %>

development:
  service: S3
  access_key_id: 'xxxxx'
  secret_access_key: 'xxxxx'
  region: 'xxxxx'
  bucket: 'xxxxx'

development.rb

  config.active_storage.service = :development

I can access fine these on web interface but not within Sidekiq

Answer 1

Use ActiveStorage::Blob#service_url. For example, assuming a Post model with a single attached header_image:

@post.header_image.service_url

---

Update: Rails 6.1

Since Rails 6.1 ActiveStorage::Blob#service_url is deprecated in favor of ActiveStorage::Blob#url.

So, now

@post.header_image.url

is the way to go.

Sources:

• Link to the corresponding PR.
• Link to source.