Add success message on update

app/controllers/editions_controller.rb

@@ -1,4 +1,5 @@
 class EditionsController < InheritedResources::Base
+  include TabbedNavHelper
   layout "design_system"
 
   defaults resource_class: Edition, collection_name: "editions", instance_name: "resource"
@@ -10,6 +11,8 @@ def index
 
   def show
     @artefact = @resource.artefact
+
+    flash[:success] = "#{current_tab.humanize} has successfully updated".html_safe
     render action: "show"
   end
 

app/views/editions/secondary_nav_tabs/_metadata.html.erb

@@ -13,15 +13,15 @@
         text: "Slug"
       },
       hint: "If you change the slug of a published page, the old slug will automatically redirect to the new one.",
-      name: "slug",
+      name: "artefact[slug]",
       value: publication.slug,
       heading_level: 2,
       heading_size: "m"
     } %>
 
     <%= render "govuk_publishing_components/components/radio", {
       heading: "Language",
-      name: "inline-radios",
+      name: "artefact[language]",
       inline: true,
       items: [
         {

test/integration/edition_edit_test.rb

@@ -47,7 +47,17 @@ class EditionEditTest < IntegrationTest
     should "show slug input box prefilled" do
       assert page.has_text?("Slug")
       assert page.has_text?("If you change the slug of a published page, the old slug will automatically redirect to the new one.")
-      assert page.has_field?('slug', with: /slug/)
+      assert page.has_field?('artefact[slug]', with: /slug/)
+    end
+
+    should "update and show success message" do
+      fill_in "artefact[slug]", with: "changed-slug"
+      choose("Welsh")
+      click_button("Update")
+
+      assert find(".gem-c-radio input[value='cy']").checked?
+      assert page.has_text?("Metadata has successfully updated")
+      assert page.has_field?('artefact[slug]', with: "changed-slug")
     end
   end
 end