add 'publish' funcionality for popular links

app/controllers/homepage_controller.rb

@@ -23,6 +23,11 @@ def update
     render "homepage/popular_links/edit"
   end
 
+  def publish
+    publish_latest_popular_links
+    render "homepage/popular_links/show"
+  end
+
   def fetch_latest_popular_link
     @latest_popular_links = PopularLinksEdition.last
   end
@@ -36,4 +41,8 @@ def update_link_items
     @latest_popular_links.link_items = link_items
     @latest_popular_links.save!
   end
+
+  def publish_latest_popular_links
+    @latest_popular_links.publish_popular_links
+  end
 end

app/models/action.rb

@@ -17,6 +17,7 @@ class Action
     PUBLISH                     = "publish".freeze,
     ARCHIVE                     = "archive".freeze,
     NEW_VERSION                 = "new_version".freeze,
+    PUBLISH_POPULAR_LINKS       = "publish_popular_links".freeze,
   ].freeze
 
   NON_STATUS_ACTIONS = [

app/models/workflow.rb

@@ -93,6 +93,10 @@ class CannotDeletePublishedPublication < RuntimeError; end
         transition all => :archived, :unless => :archived?
       end
 
+      event :publish_popular_links do
+        transition %i[draft] => :published
+      end
+
       state :in_review do
         validates :review_requested_at, presence: true
       end

app/views/homepage/popular_links/_sidebar.html.erb

@@ -4,5 +4,6 @@
     <%= primary_theme_navigation_button("Create new edition", :post, create_popular_links_path) %>
   <% else %>
     <%= primary_theme_navigation_button("Edit popular links", :get, edit_popular_links_path(@latest_popular_links)) %>
+    <%= secondary_theme_navigation_button("Publish", :post, publish_popular_links_path(@latest_popular_links)) %>
   <% end %>
 </div>

config/routes.rb

@@ -76,6 +76,7 @@
   post "/homepage/popular-links/create" => "homepage#create", as: "create_popular_links"
   get "/homepage/popular-links/:id" => "homepage#edit", as: "edit_popular_links"
   patch "/homepage/popular-links/:id" => "homepage#update", as: "update_popular_links"
+  post "/homepage/popular-links/:id/publish" => "homepage#publish", as: "publish_popular_links"
 
   mount GovukAdminTemplate::Engine, at: "/style-guide"
   mount Flipflop::Engine => "/flipflop"

test/functional/homepage_controller_test.rb

@@ -91,12 +91,28 @@ class HomepageControllerTest < ActionController::TestCase
     should "render edit template on errors" do
       patch :update, params: { id: @popular_links.id,
                                "popular_links" =>
-                                 { "1" => { "title" => "title has changed", "url" => "https://www.url1.com" }, } }
+                                 { "1" => { "title" => "title has changed", "url" => "https://www.url1.com" } } }
 
       assert_template "homepage/popular_links/edit"
     end
   end
 
+  context "#publish" do
+    setup do
+      @popular_links = FactoryBot.create(:popular_links, state: "draft")
+    end
+
+    should "publish latest draft popular links and render show template" do
+      assert_equal "draft", PopularLinksEdition.last.state
+
+      post :publish, params: { id: @popular_links.id }
+
+      assert_response :ok
+      assert_template "homepage/popular_links/show"
+      assert_equal "published", PopularLinksEdition.last.state
+    end
+  end
+
   def create_a_published_popular_links
     FactoryBot.create(:popular_links, state: "published")
   end

test/integration/homepage_popular_links_test.rb

@@ -96,7 +96,7 @@ class HomepagePopularLinksTest < JavascriptIntegrationTest
       assert page.has_text?("URL", count: 6)
     end
 
-    should "save when clicked on 'Save'" do
+    should "update record when clicked on 'Save'" do
       fill_in "popular_links[1][title]", with: "new title 1"
       click_button("Save")
 
@@ -114,6 +114,24 @@ class HomepagePopularLinksTest < JavascriptIntegrationTest
     end
   end
 
+  context "#publish" do
+    setup do
+      click_button("Create new edition")
+    end
+
+    should "publish the latest draft popular links" do
+      row = find_all(".govuk-summary-list__row")
+      assert row[1].has_text?("Status")
+      assert row[1].has_text?("DRAFT")
+
+      click_button("Publish")
+
+      row = find_all(".govuk-summary-list__row")
+      assert row[1].has_text?("Status")
+      assert row[1].has_text?("PUBLISHED")
+    end
+  end
+
   def visit_popular_links
     visit "/homepage/popular-links"
   end