Merge pull request rails#51931 from justinko/issue-51882

Allow ActiveStorage::Attachment creation with no record attachments

Author: rafaelfranca

activestorage/app/models/active_storage/attachment.rb

@@ -156,7 +156,7 @@ def dependent
     end
 
     def named_variants
-      record.attachment_reflections[name]&.named_variants
+      record.attachment_reflections[name]&.named_variants || {}
     end
 
     def transformations_by_name(transformations)

activestorage/test/models/attachment_test.rb

@@ -159,6 +159,10 @@ class ActiveStorage::AttachmentTest < ActiveSupport::TestCase
     assert_nothing_raised { attachment.destroy }
   end
 
+  test "can create an attachment with the record having no attachment reflections" do
+    assert_nothing_raised { ActiveStorage::Attachment.create!(name: "whatever", record: @user, blob: create_blob) }
+  end
+
   private
     def assert_blob_identified_before_owner_validated(owner, blob, content_type)
       validated_content_type = nil