1 files changed, 40 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..c08fd56652
--- /dev/null
+++ b/activestorage/lib/active_storage/attached.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require "action_dispatch"
+require "action_dispatch/http/upload"
+require "active_support/core_ext/module/delegation"
+
+module ActiveStorage
+  # Abstract base class for the concrete ActiveStorage::Attached::One and ActiveStorage::Attached::Many
+  # classes that both provide proxy access to the blob association for a record.
+  class Attached
+    attr_reader :name, :record, :dependent
+
+    def initialize(name, record, dependent:)
+      @name, @record, @dependent = name, record, dependent
+    end
+
+    private
+      def create_blob_from(attachable)
+        case attachable
+        when ActiveStorage::Blob
+          attachable
+        when ActionDispatch::Http::UploadedFile, Rack::Test::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
+end
+
+require "active_storage/attached/one"
+require "active_storage/attached/many"
+require "active_storage/attached/macros"