1 files changed, 33 insertions, 0 deletions
diff --git a/lib/gitlab/background_migration/user_mentions/models/namespace.rb b/lib/gitlab/background_migration/user_mentions/models/namespace.rb
new file mode 100644
index 00000000000..6d7b9a86e69
--- /dev/null
+++ b/lib/gitlab/background_migration/user_mentions/models/namespace.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module BackgroundMigration
+    module UserMentions
+      module Models
+        # isolated Namespace model
+        class Namespace < ApplicationRecord
+          include ::Gitlab::VisibilityLevel
+          include ::Gitlab::Utils::StrongMemoize
+          include Gitlab::BackgroundMigration::UserMentions::Models::Concerns::Namespace::RecursiveTraversal
+
+          belongs_to :parent, class_name: "::Gitlab::BackgroundMigration::UserMentions::Models::Namespace"
+
+          def visibility_level_field
+            :visibility_level
+          end
+
+          def has_parent?
+            parent_id.present? || parent.present?
+          end
+
+          # Overridden in EE::Namespace
+          def feature_available?(_feature)
+            false
+          end
+        end
+      end
+    end
+  end
+end
+
+Namespace.prepend_if_ee('::EE::Namespace')