Touch nodes and all their ancestors on page update

Menu partials might be cached.
So we need to make sure the menu node a page might be
attached to and all their ancestors get touched as well.

Closes #2080

app/models/alchemy/page.rb

@@ -144,7 +144,7 @@ class Page < BaseRecord
     after_update :create_legacy_url,
       if: :saved_change_to_urlname?
 
-    after_update -> { nodes.update_all(updated_at: Time.current) }
+    after_update :touch_nodes
 
     # Concerns
     include PageScopes
@@ -603,5 +603,10 @@ def set_language_code
     def create_legacy_url
       legacy_urls.find_or_create_by(urlname: urlname_before_last_save)
     end
+
+    def touch_nodes
+      ids = node_ids + nodes.map { |n| n.ancestors.pluck(:id) }
+      Node.where(id: ids).touch_all
+    end
   end
 end

spec/models/alchemy/page_spec.rb

@@ -2050,17 +2050,18 @@ class AnotherUrlPathClass; end
 
     describe "#nodes" do
       let(:page) { create(:alchemy_page) }
-      let(:node) { create(:alchemy_node, page: page, updated_at: 1.hour.ago) }
+      let(:parent) { create(:alchemy_node, updated_at: 1.hour.ago) }
+      let(:node) { create(:alchemy_node, page: page, parent: parent, updated_at: 1.hour.ago) }
 
       it "returns all nodes the page is attached to" do
         expect(page.nodes).to include(node)
       end
 
       describe "after page updates" do
-        it "touches all nodes" do
-          expect {
-            page.update(name: "foo")
-          }.to change { node.reload.updated_at }
+        subject { page.update(name: "foo") }
+
+        it "touches all nodes and all their ancestors" do
+          expect { subject }.to change { node.reload.updated_at }.and change { parent.reload.updated_at }
         end
       end
     end