Add hide_from_search_engines method

- we have to add a robots noindex tag to pages that are children of a list of specific pages in the publication presenter
- extends model to include parent

Author: andysellick

app/models/html_publication.rb

@@ -1,2 +1,5 @@
 class HtmlPublication < ContentItem
+  def parent
+    linked("parent").first
+  end
 end

app/presenters/html_publication_presenter.rb

@@ -1,2 +1,5 @@
 class HtmlPublicationPresenter < ContentItemPresenter
+  def hide_from_search_engines?
+    PublicationPresenter::PATHS_TO_HIDE.include? content_item.parent.base_path
+  end
 end

app/views/html_publication/show.html.erb

@@ -5,7 +5,7 @@
     schema: :html_publication,
     content_item: content_item.to_h %>
 
-  <% if content_item.hide_from_search_engines? %>
+  <% if @presenter.hide_from_search_engines? %>
     <meta name="robots" content="noindex">
   <% end %>
 <% end %>

spec/models/html_publication_spec.rb

@@ -1,2 +1,9 @@
 RSpec.describe HtmlPublication do
+  subject(:html_publication) { described_class.new(content_store_response) }
+
+  let(:content_store_response) { GovukSchemas::Example.find("html_publication", example_name: "published") }
+
+  it "returns a parent" do
+    expect(html_publication.parent.content_id).to eq("8b19c238-54e3-4e27-b0d7-60f8e2a677c9")
+  end
 end

spec/presenter/html_publication_presenter_spec.rb

@@ -1,2 +1,23 @@
 RSpec.describe HtmlPublicationPresenter do
+  subject(:html_publication_presenter) { described_class.new(HtmlPublication.new(content_store_response)) }
+
+  let(:content_store_response) { GovukSchemas::Example.find("html_publication", example_name: "long_form_and_automatically_numbered_headings") }
+
+  describe "#hide_from_search_engines?" do
+    it "returns false" do
+      expect(html_publication_presenter.hide_from_search_engines?).to be false
+    end
+
+    context "when the page is in the hide list" do
+      let(:content_store_response) do
+        GovukSchemas::Example.find(:html_publication, example_name: "long_form_and_automatically_numbered_headings").tap do |example|
+          example["links"]["parent"][0]["base_path"] = "/government/publications/govuk-app-testing-privacy-notice-how-we-use-your-data"
+        end
+      end
+
+      it "returns true" do
+        expect(html_publication_presenter.hide_from_search_engines?).to be true
+      end
+    end
+  end
 end