Where does active storage store files (on disk), and how can I retrieve them physically?

Question

I am using active storage with Rails 5.2. I am following the EdgeRails guide, and have configured Active-Storage to use the local disk.

The file uploads work great when I am using the Rails App.

However, the problem is that I need to physically access those uploaded files without using Rails as a mediator.

A query for where the files are stored returns this:

url_for(@employee_staff.avatar)
=> "/rails/active_storage/blobs/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBGUT09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--e76664d247cb5437fe1cd11f7ee0ded24f95aee2/profilepic3.jpeg"

I am trying to figure out where this file path is saved in my local disk. So far, I've had no luck.

Any explanations about how Active-Storage works and where I can see the uploaded files are greatly appreciated.

Answer 1

On your local development machine (since you mentioned local disk), you should have a file config/storage.yml that has a block similar to below:

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

In this example above, I'm storing the files in a folder named storage in the root of my rails application. Inside that folder you'll find nested folders that aren't meant to be navigated via file explorer/Finder (but you can).

Thru your rails app, via views for example, you'd use the url helpers which aren't well documented yet.

From a rails console, you can try, for a model named Foo, with a has_one_attached :photo

Foo.last.photo.blob.key

It should give you a ~24 character string.

• The first 2 characters are a subfolder inside the folder I pointed you to above
• The next 2 characters are a subfolder inside that

Inside the subfolder is a file with the name that matches the key you printed out above (no extension). That's your file.

Answer 2

If you have variants:

variant = @employee_staff
            .avatar
            .attachment
            .variant(resize: '100x100')
            .processed # If variant is not processed

variant.service.send(:path_for, variant.key) # Absolute path to variant file