1 files changed, 35 insertions, 0 deletions
diff --git a/activestorage/app/models/active_storage/attachment.rb b/activestorage/app/models/active_storage/attachment.rb
new file mode 100644
index 0000000000..9f61a5dbf3
--- /dev/null
+++ b/activestorage/app/models/active_storage/attachment.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+require "active_support/core_ext/module/delegation"
+
+# 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 <tt>has_one/many_attached :thingy, dependent: false</tt>, so that destroying
+# any one record won't destroy the blob as well. (Then you'll need to do your own garbage collecting, though).
+class ActiveStorage::Attachment < ActiveRecord::Base
+  self.table_name = "active_storage_attachments"
+
+  belongs_to :record, polymorphic: true, touch: true
+  belongs_to :blob, class_name: "ActiveStorage::Blob"
+
+  delegate_missing_to :blob
+
+  after_create_commit :analyze_blob_later
+
+  # Synchronously purges the blob (deletes it from the configured service) and destroys the attachment.
+  def purge
+    blob.purge
+    destroy
+  end
+
+  # Destroys the attachment and asynchronously purges the blob (deletes it from the configured service).
+  def purge_later
+    blob.purge_later
+    destroy
+  end
+
+  private
+    def analyze_blob_later
+      blob.analyze_later unless blob.analyzed?
+    end
+end