Merge pull request #30020 from rails/active-storage-import

Add Active Storage to Rails 

1 files changed, 28 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..e94fc69bba
--- /dev/null
+++ b/activestorage/app/models/active_storage/attachment.rb
@@ -0,0 +1,28 @@
+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 `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).
+class ActiveStorage::Attachment < ActiveRecord::Base
+  self.table_name = "active_storage_attachments"
+
+  belongs_to :record, polymorphic: true
+  belongs_to :blob, class_name: "ActiveStorage::Blob"
+
+  delegate_missing_to :blob
+
+  # Purging an attachment will purge the blob (delete the file on the service, then destroy the record)
+  # and then destroy the attachment itself.
+  def purge
+    blob.purge
+    destroy
+  end
+
+  # Purging an attachment means purging the blob, which means talking to the service, which means
+  # talking over the internet. Whenever you're doing that, it's a good idea to put that work in a job,
+  # so it doesn't hold up other operations. That's what #purge_later provides.
+  def purge_later
+    ActiveStorage::PurgeJob.perform_later(self)
+  end
+end