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Attachments associate records with blobs. Usually that's a one record-many blobs relationship, but it is possible to associate many different records with the same blob. If you're doing that, you'll want to declare with has_one/many_attached :thingy, dependent: false, so that destroying any one record won't destroy the blob as well. (Then you'll need to do your own garbage collecting, though).

Methods
P
Instance Public methods
purge()

Synchronously deletes the attachment and purges the blob.

# File activestorage/app/models/active_storage/attachment.rb, line 21
def purge
  delete
  blob.purge
end
purge_later()

Deletes the attachment and enqueues a background job to purge the blob.

# File activestorage/app/models/active_storage/attachment.rb, line 27
def purge_later
  delete
  blob.purge_later
end