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

Attachments also have access to all methods from ActiveStorage::Blob.

Methods
P

Instance Public methods

purge()

Synchronously deletes the attachment and purges the blob.

Source: show | on GitHub 

# File activestorage/app/models/active_storage/attachment.rb, line 23
def purge
  transaction do
    delete
    record&.touch
  end
  blob&.purge
end

purge_later()

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

Source: show | on GitHub 

# File activestorage/app/models/active_storage/attachment.rb, line 32
def purge_later
  transaction do
    delete
    record&.touch
  end
  blob&.purge_later
end