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. A foreign-key constraint on the attachments table prevents blobs from being purged if they’re still attached to any records.

Methods

Instance Public methods

purge()

Synchronously deletes the attachment and purges the blob.

Source: 

# File activestorage/app/models/active_storage/attachment.rb, line 20
def purge
  delete
  blob&.purge
end

purge_later()

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

Source: 

# File activestorage/app/models/active_storage/attachment.rb, line 26
def purge_later
  delete
  blob&.purge_later
end