module Mixin module HasBackends extend ActiveSupport::Concern included do cattr_accessor :backends do Set.new end self_path = ActiveSupport::Dependencies.search_for_file name.underscore backends_path = self_path.delete_suffix File.extname(self_path) Mixin::RequiredSubPaths.eager_load_recursive backends_path backends = "#{name}::Backend".constantize.descendants self.backends = Set.new(backends) end end end