Merge pull request #976 from alphagov/track-themes

Revert "Revert "Track themes""

app/assets/javascripts/analytics/static-analytics.js

@@ -99,6 +99,7 @@
   };
 
   StaticAnalytics.prototype.setDimensionsThatHaveDefaultValues = function(dimensions) {
+    this.setThemesDimension(dimensions['themes']);
     this.setNavigationPageTypeDimension(dimensions['navigation-page-type']);
     this.setUserJourneyStage(dimensions['user-journey-stage']);
   };
@@ -165,6 +166,10 @@
     this.setDimension(2, format);
   };
 
+  StaticAnalytics.prototype.setThemesDimension = function(themes) {
+    this.setDimension(3, themes || 'other');
+  };
+
   StaticAnalytics.prototype.setResultCountDimension = function(count) {
     this.setDimension(5, count);
   };

app/views/govuk_component/analytics_meta_tags.raw.html.erb

@@ -34,6 +34,27 @@
 
   navigation_document_type = content_item_hash[:navigation_document_supertype]
   meta_tags["govuk:navigation-document-type"] = navigation_document_type if navigation_document_type
+
+  def root_taxons(content_item)
+    root_taxon_set = Set.new
+
+    links = content_item[:links]
+    # Taxons will have :parent_taxons, but content items will have :taxons
+    parent_taxons = links[:parent_taxons] || links[:taxons] unless links.nil?
+
+    if parent_taxons.blank?
+      root_taxon_set << content_item[:title] if content_item[:document_type] == 'taxon'
+    else
+      parent_taxons.each do |parent_taxon|
+        root_taxon_set += root_taxons(parent_taxon)
+      end
+    end
+
+    root_taxon_set
+  end
+
+  themes = root_taxons(content_item_hash)
+  meta_tags["govuk:themes"] = themes.to_a.sort.join('; ') unless themes.empty?
 %>
 <% meta_tags.each do |name, content| %>
   <meta name="<%= name %>" content="<%= content %>">

spec/javascripts/analytics/static-analytics-spec.js

@@ -14,7 +14,7 @@ describe("GOVUK.StaticAnalytics", function() {
 
   describe('when created', function() {
     // The number of setup arguments which are set before the dimensions
-    const expectedDefaultArgumentCount = 7;
+    const expectedDefaultArgumentCount = 8;
 
     var universalSetupArguments;
 
@@ -132,17 +132,23 @@ describe("GOVUK.StaticAnalytics", function() {
       });
 
       [
+        {
+          name: 'themes',
+          number: 3,
+          defaultValue: 'other',
+          setupArgumentsIndex: 5
+        },
         {
           name: 'navigation-page-type',
           number: 32,
           defaultValue: 'none',
-          setupArgumentsIndex: 5
+          setupArgumentsIndex: 6
         },
         {
           name: 'user-journey-stage',
           number: 33,
           defaultValue: 'thing',
-          setupArgumentsIndex: 6
+          setupArgumentsIndex: 7
         }
       ].forEach(function (dimension) {
         it('sets the ' + dimension.name + ' dimension from a meta tag if present', function () {

test/govuk_component/analytics_meta_tags_test.rb

@@ -118,6 +118,105 @@ def example_document_for(format, example_name)
     assert_political_status_for(political, current, 'non-political')
   end
 
+  test "renders themes metatag for root taxon" do
+    taxon = {
+      title: 'Root taxon',
+      links: {
+        parent_taxons: [],
+      },
+    }
+    render_component(content_item: example_document_for('taxon', 'taxon').merge(taxon))
+    assert_meta_tag('govuk:themes', 'Root taxon')
+  end
+
+  test "renders themes metatag for child taxon" do
+    taxon = {
+      title: 'Child taxon',
+      links: {
+        parent_taxons: [
+          {
+            title: 'Root taxon',
+            document_type: 'taxon',
+          },
+        ],
+      },
+    }
+    render_component(content_item: example_document_for('taxon', 'taxon').merge(taxon))
+    assert_meta_tag('govuk:themes', 'Root taxon')
+  end
+
+  test "renders themes metatag for content item" do
+    content_item = {
+      links: {
+        taxons: [
+          {
+            title: 'Child taxon',
+            document_type: 'taxon',
+            links: {
+              parent_taxons: [
+                {
+                  title: 'Root taxon',
+                  document_type: 'taxon',
+                },
+              ],
+            },
+          },
+        ],
+      },
+    }
+    render_component(content_item: example_document_for('case_study', 'case_study').merge(content_item))
+    assert_meta_tag('govuk:themes', 'Root taxon')
+  end
+
+  test "renders themes metatag for content item with multiple roots" do
+    content_item = {
+      links: {
+        taxons: [
+          {
+            title: 'Education child taxon',
+            document_type: 'taxon',
+            links: {
+              parent_taxons: [
+                {
+                  title: 'Education root taxon',
+                  document_type: 'taxon',
+                },
+              ],
+            },
+          },
+          {
+            title: 'Parenting grandchild taxon',
+            document_type: 'taxon',
+            links: {
+              parent_taxons: [
+                title: 'Parenting child taxon',
+                document_type: 'taxon',
+                links: {
+                  parent_taxons: [
+                    {
+                      title: 'Parenting root taxon',
+                      document_type: 'taxon',
+                    }
+                  ],
+                },
+              ],
+            },
+          },
+        ],
+      },
+    }
+    render_component(content_item: example_document_for('case_study', 'case_study').merge(content_item))
+    assert_meta_tag('govuk:themes', 'Education root taxon; Parenting root taxon')
+  end
+
+  test "does not render themes metatag for content item with no taxon" do
+    content_item = {
+      links: {},
+    }
+    render_component(content_item: example_document_for('case_study', 'case_study').merge(content_item))
+    assert_select "meta[name='govuk:themes']", 0
+  end
+
   def assert_political_status_for(political, current, expected_political_status)
     render_component(content_item: { details: { political: political, government: { current: current, slug: 'government' } } })
     assert_meta_tag('govuk:political-status', expected_political_status)