Remove closest_gitlab_subscription in favor of root_ancestor

- logic is being duplicated and is memoized already.

ee/app/helpers/ee/subscribable_banner_helper.rb

@@ -65,7 +65,7 @@ module EE
       entity = @project || @group
       return unless entity && entity.persisted?
 
-      subscription = entity.closest_gitlab_subscription
+      subscription = entity.root_ancestor.gitlab_subscription
 
       return unless subscription
 

ee/app/models/ee/namespace.rb

@@ -211,16 +211,6 @@ module EE
       end
     end
 
-    def closest_gitlab_subscription
-      strong_memoize(:closest_gitlab_subscription) do
-        if parent_id
-          root_ancestor.gitlab_subscription
-        else
-          gitlab_subscription
-        end
-      end
-    end
-
     def plan_name_for_upgrading
       return ::Plan::FREE if trial_active?
 

ee/app/models/ee/namespace/root_storage_size.rb

@@ -41,15 +41,15 @@ module EE
     def enforce_limit?
       return false if Date.current < ENFORCEMENT_DATE
 
-      return true unless closest_gitlab_subscription&.has_a_paid_hosted_plan?
+      return true unless gitlab_subscription&.has_a_paid_hosted_plan?
 
-      closest_gitlab_subscription.start_date >= EFFECTIVE_DATE
+      gitlab_subscription.start_date >= EFFECTIVE_DATE
     end
 
     private
 
     attr_reader :root_namespace
 
-    delegate :closest_gitlab_subscription, to: :root_namespace
+    delegate :gitlab_subscription, to: :root_namespace
   end
 end

ee/app/models/ee/project.rb

@@ -198,7 +198,6 @@ module EE
       delegate :merge_trains_enabled, :merge_trains_enabled=, to: :ci_cd_settings, allow_nil: true
 
       delegate :auto_rollback_enabled, :auto_rollback_enabled=, to: :ci_cd_settings, allow_nil: true
-      delegate :closest_gitlab_subscription, to: :namespace
 
       delegate :requirements_access_level, to: :project_feature, allow_nil: true
       delegate :pipeline_configuration_full_path, to: :compliance_management_framework, allow_nil: true

ee/lib/gitlab/expiring_subscription_message.rb

@@ -129,7 +129,7 @@ module Gitlab
     end
 
     def subscription_future_renewal?
-      return if self_managed? || namespace.nil? || !namespace.closest_gitlab_subscription.present?
+      return if self_managed? || namespace.nil? || !namespace.root_ancestor.gitlab_subscription.present?
 
       ::GitlabSubscriptions::CheckFutureRenewalService.new(namespace: namespace).execute
     end

ee/spec/helpers/ee/subscribable_banner_helper_spec.rb

@@ -23,9 +23,10 @@ RSpec.describe EE::SubscribableBannerHelper, :saas do
 
     shared_examples 'when a subscription exists' do
       let(:gitlab_subscription) { build_stubbed(:gitlab_subscription) }
+      let(:root_ancestor) { entity.root_ancestor }
 
       it 'returns a decorator' do
-        allow(entity).to receive(:closest_gitlab_subscription).and_return(gitlab_subscription)
+        allow(root_ancestor).to receive(:gitlab_subscription).and_return(gitlab_subscription)
 
         expect(subject).to be_a(SubscriptionPresenter)
       end
@@ -117,7 +118,7 @@ RSpec.describe EE::SubscribableBannerHelper, :saas do
           allow(::Gitlab::CurrentSettings).to receive(:should_check_namespace_plan?).and_return(true)
         end
 
-        let(:gitlab_subscription) { entity.closest_gitlab_subscription }
+        let(:gitlab_subscription) { entity.root_ancestor.gitlab_subscription }
         let(:decorated_mock) { double(:decorated_mock) }
         let(:message_mock) { double(:message_mock) }
         let(:user) { double(:user_mock) }

ee/spec/models/ee/namespace_spec.rb

@@ -2119,58 +2119,6 @@ RSpec.describe Namespace do
     end
   end
 
-  describe '#closest_gitlab_subscription', :saas do
-    subject { group.closest_gitlab_subscription }
-
-    context 'when there is a root ancestor' do
-      let(:group) { create(:group, parent: root) }
-
-      context 'when root has a subscription' do
-        let(:root) { create(:group_with_plan) }
-
-        it { is_expected.to be_a(GitlabSubscription) }
-      end
-
-      context 'when root has no subscription' do
-        let(:root) { create(:group) }
-
-        it { is_expected.to be_nil }
-      end
-    end
-
-    context 'when there is no root ancestor' do
-      context 'for groups' do
-        context 'has a subscription' do
-          let(:group) { create(:group_with_plan) }
-
-          it { is_expected.to be_a(GitlabSubscription) }
-        end
-
-        context 'it has no subscription' do
-          let(:group) { create(:group) }
-
-          it { is_expected.to be_nil }
-        end
-      end
-
-      context 'for personal namespaces' do
-        subject { namespace.closest_gitlab_subscription }
-
-        context 'has a subscription' do
-          let(:namespace) { create(:namespace_with_plan) }
-
-          it { is_expected.to be_a(GitlabSubscription) }
-        end
-
-        context 'it has no subscription' do
-          let(:namespace) { create(:namespace) }
-
-          it { is_expected.to be_nil }
-        end
-      end
-    end
-  end
-
   describe '#namespace_limit' do
     let(:group) { create(:group, parent: parent) }
 

ee/spec/models/project_spec.rb

@@ -15,8 +15,6 @@ RSpec.describe Project do
     it { is_expected.to delegate_method(:ci_minutes_quota).to(:shared_runners_limit_namespace) }
     it { is_expected.to delegate_method(:shared_runners_minutes_limit_enabled?).to(:shared_runners_limit_namespace) }
 
-    it { is_expected.to delegate_method(:closest_gitlab_subscription).to(:namespace) }
-
     it { is_expected.to delegate_method(:pipeline_configuration_full_path).to(:compliance_management_framework) }
 
     it { is_expected.to delegate_method(:prevent_merge_without_jira_issue).to(:project_setting) }