Add Media::Attachment

lib/whaleback/media/attachment.rb

+# == Schema Information
+#
+# Table name: media_attachments
+#
+#  id            :integer          not null, primary key
+#  column_name   :string(255)
+#  attached_type :string(255)
+#  attached_id   :integer
+#  obj_id        :integer
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
+#
+# Indexes
+#
+#  index_media_attachments_on_attached_type_and_attached_id  (attached_type,attached_id)
+#  index_media_attachments_on_obj_id                         (obj_id)
+#
+
+module Whaleback
+  module Media
+    class Attachment < ApplicationRecord
+      belongs_to :attached, polymorphic: true
+      belongs_to :obj
+    end  
+  end
+end