1 files changed, 36 insertions, 0 deletions
diff --git a/activestorage/lib/active_storage/attached.rb b/activestorage/lib/active_storage/attached.rb
new file mode 100644
index 0000000000..2dbf841864
--- /dev/null
+++ b/activestorage/lib/active_storage/attached.rb
@@ -0,0 +1,36 @@
+require "action_dispatch"
+require "action_dispatch/http/upload"
+require "active_support/core_ext/module/delegation"
+
+# Abstract baseclass for the concrete `ActiveStorage::Attached::One` and `ActiveStorage::Attached::Many`
+# classes that both provide proxy access to the blob association for a record.
+class ActiveStorage::Attached
+  attr_reader :name, :record
+
+  def initialize(name, record)
+    @name, @record = name, record
+  end
+
+  private
+    def create_blob_from(attachable)
+      case attachable
+      when ActiveStorage::Blob
+        attachable
+      when ActionDispatch::Http::UploadedFile
+        ActiveStorage::Blob.create_after_upload! \
+          io: attachable.open,
+          filename: attachable.original_filename,
+          content_type: attachable.content_type
+      when Hash
+        ActiveStorage::Blob.create_after_upload!(attachable)
+      when String
+        ActiveStorage::Blob.find_signed(attachable)
+      else
+        nil
+      end
+    end
+end
+
+require "active_storage/attached/one"
+require "active_storage/attached/many"
+require "active_storage/attached/macros"