```rb # Gemfile.lock … closure_tree (7.4.0) … ``` I managed to save the namespace (`Admin::`) for the `parent` method with the following code: ```rb # app/models/catalog.rb class Catalog < ApplicationRecord has_closure_tree dependent: nil end # app/models/admin/catalog.rb class Admin::Catalog < Catalog belongs_to :parent, class_name: '::Admin::Catalog', optional: true end ``` Console, works as expected: |> <b>Admin::</b>Catalog.last.parent => #<<b>Admin::</b>Catalog:0x00007ff2250a2d18 However, I need any help in order to bypass other methods, for example: |> <b>Admin::</b>Catalog.last.self_and_ancestors => [#<Catalog:0x00007ff22a4c7790