Ruby dynamically determine class and calling methods

I have a factory module which returns class, like this

# frozen_string_literal: truemodule Factory  module Subscriptions    module SubscriptionSelector      class << self        def select_by_plan_type_for_subscription(plan)          case plan.type          when 'UpsellSubscription'            UpsellSubscription          else            NewSubscription          end        end      end    end  endend

and I am using this module like this

subscription = Factory::Subscriptions::SubscriptionSelector                       .select_by_plan_type_for_subscription(plan)                       .create!(                         account: account,                         product: plan.product,                         status: 'active',                         active_plan: plan,                         active_plan_end_date: end_date,                         renewal_date: end_date                       )

but somehow my tests are failing with NameError: uninitialized constant Factory::Subscriptions::SubscriptionSelector

both NewSubscription and UpsellSubscription are ActiveRecord and they share same logics via concern

Trying to write factory method for dynamically class calling