Add delete to admin tab

app/assets/stylesheets/editions.scss

@@ -8,3 +8,9 @@
   @include govuk-responsive-padding(4, "top");
   border-top: 1px solid $govuk-border-colour;
 }
+
+.editions__admin__tab {
+  .govuk-link {
+    margin-top: govuk-spacing(3)
+  }
+}

app/controllers/editions_controller.rb

@@ -11,9 +11,12 @@ class EditionsController < InheritedResources::Base
   before_action only: %i[unpublish confirm_unpublish process_unpublish] do
     require_govuk_editor(redirect_path: edition_path(resource))
   end
-  before_action only: %i[progress admin update] do
+  before_action only: %i[progress admin update confirm_destroy] do
     require_editor_permissions
   end
+  before_action only: %i[confirm_destroy destroy] do
+    destroyable_edition?
+  end
 
   helper_method :locale_to_language
 
@@ -90,6 +93,19 @@ def progress
     redirect_to edition_path(resource)
   end
 
+  def confirm_destroy
+    render "secondary_nav_tabs/confirm_destroy"
+  end
+
+  def destroy
+    @resource.destroy!
+    flash[:success] = "Edition deleted"
+    redirect_to root_url
+  rescue StandardError
+    flash[:danger] = downstream_error_message(:deleted)
+    render "secondary_nav_tabs/confirm_destroy"
+  end
+
 protected
 
   def setup_view_paths
@@ -108,12 +124,12 @@ def unpublish_edition(artefact)
   end
 
   def render_confirm_page_with_error
-    @resource.errors.add(:unpublish, downstream_error_message)
+    @resource.errors.add(:unpublish, downstream_error_message(:unpublished))
     render "secondary_nav_tabs/confirm_unpublish"
   end
 
-  def downstream_error_message
-    "Due to a service problem, the edition couldn't be unpublished"
+  def downstream_error_message(action)
+    "Due to a service problem, the edition couldn't be #{action}"
   end
 
   def locale_to_language(locale)
@@ -153,4 +169,11 @@ def progress_action_param
   def permitted_params
     params.require(:edition).permit(%i[title overview in_beta body major_change change_note])
   end
+
+  def destroyable_edition?
+    return if @resource.can_destroy?
+
+    flash[:danger] = "Cannot delete a #{description(@resource).downcase} that has ever been published."
+    redirect_to edition_path(@resource)
+  end
 end

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

@@ -1,14 +1,12 @@
 <% @edition = @resource %>
 <div class="govuk-grid-row">
-  <div class="govuk-grid-column-two-thirds">
+  <div class="govuk-grid-column-two-thirds editions__admin__tab">
     <%= header_for("Admin") %>
-
-    <% if @edition.fact_check? %>
-      <%= form_for @edition, url: skip_fact_check_edition_path(@edition), method: "post" do %>
-        <%= render "govuk_publishing_components/components/button", {
-          text: "Skip fact check",
-        } %>
-        <% end %>
-    <% end %>
+    <%= render "govuk_publishing_components/components/list", {
+      items: [
+        ( primary_button_for(@edition, skip_fact_check_edition_path(@edition), "Skip fact check") if @edition.fact_check? ),
+        ( link_to("Delete edition #{@edition.version_number}", confirm_destroy_edition_path(@resource), class: "govuk-link gem-link--destructive") if @edition.can_destroy? ),
+      ],
+    } %>
   </div>
 </div>

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

@@ -0,0 +1,37 @@
+<% @edition = @resource %>
+<% content_for :title_context, @edition.title %>
+<% content_for :page_title, "Delete edition" %>
+<% content_for :title, "Delete edition" %>
+<div class="govuk-grid-row">
+  <% unless @edition.errors.empty? %>
+    <% content_for :error_summary do %>
+      <%= render("govuk_publishing_components/components/error_summary", {
+        id: "error-summary",
+        title: "There is a problem",
+        items: @edition.errors.map do |error|
+          {
+            text: error.message,
+            href: "##{error.attribute.to_s}",
+          }
+        end,
+      }) %>
+    <% end %>
+  <% end %>
+
+  <div class="govuk-grid-column-two-thirds">
+    <%= render "govuk_publishing_components/components/inset_text", {
+      text: "If you delete this edition it cannot be undone.",
+    } %>
+
+    <%= form_for @edition, url: admin_delete_edition_path(@edition), method: :delete do %>
+      <p class="govuk-body govuk-!-margin-bottom-7">Are you sure you want to delete this edition?</p>
+      <div class="govuk-button-group">
+        <%= render "govuk_publishing_components/components/button", {
+          text: "Delete edition",
+          destructive: true,
+        } %>
+        <%= link_to("Cancel", admin_edition_path, class: "govuk-link govuk-link--no-visited-state") %>
+      </div>
+    <% end %>
+  </div>
+</div>

config/routes.rb

@@ -27,6 +27,8 @@
         get "unpublish"
         get "unpublish/confirm-unpublish", to: "editions#confirm_unpublish", as: "confirm_unpublish"
         post "process_unpublish"
+        get "admin/confirm-destroy", to: "editions#confirm_destroy", as: "confirm_destroy"
+        delete "admin/delete-edition", to: "editions#destroy", as: "admin_delete"
         post "progress"
         post "skip_fact_check",
              to: "editions#progress",

test/functional/editions_controller_test.rb

@@ -168,28 +168,98 @@ class EditionsControllerTest < ActionController::TestCase
   end
 
   context "#admin" do
-    should "show the admin page for the edition" do
-      get :admin, params: { id: @edition.id }
+    context "do not have required permissions" do
+      context "Welsh editors and non Welsh edition" do
+        setup do
+          login_as_welsh_editor
+        end
 
-      assert_response :success
+        %i[admin confirm_destroy].each do |url_path|
+          should "show permission error and redirects to edition path for #{url_path} path" do
+            get url_path, params: { id: @edition.id }
+
+            assert_redirected_to edition_path(@edition)
+            assert_equal "You do not have correct editor permissions for this action.", flash[:danger]
+          end
+        end
+      end
+
+      context "nor Welsh nor Govuk editors" do
+        setup do
+          user = FactoryBot.create(:user, name: "Stub User")
+          login_as(user)
+        end
+
+        %i[admin confirm_destroy].each do |url_path|
+          should "show permission error and redirects to edition path for #{url_path} path" do
+            get url_path, params: { id: @edition.id }
+
+            assert_redirected_to edition_path(@edition)
+            assert_equal "You do not have correct editor permissions for this action.", flash[:danger]
+          end
+        end
+      end
     end
 
-    context "Welsh editors" do
-      setup do
-        login_as_welsh_editor
+    context "has required permissions" do
+      context "Welsh editors and welsh edition" do
+        setup do
+          login_as_welsh_editor
+        end
+
+        %i[admin confirm_destroy].each do |url_path|
+          should "be able to navigate successfully to #{url_path} path" do
+            get url_path, params: { id: @welsh_edition.id }
+
+            assert_response :success
+          end
+        end
       end
 
-      should "be able to see the admin page for Welsh editions" do
-        get :admin, params: { id: @welsh_edition.id }
+      should "be able to navigate to the admin path" do
+        get :admin, params: { id: @edition.id }
 
         assert_response :success
       end
 
-      should "not be able to see the admin page for non-Welsh editions" do
-        get :admin, params: { id: @edition.id }
+      context "#confirm_destroy" do
+        should "be able to navigate to the confirm destroy path" do
+          get :confirm_destroy, params: { id: @edition.id }
 
-        assert_redirected_to edition_path(@edition)
-        assert_equal "You do not have correct editor permissions for this action.", flash[:danger]
+          assert_response :success
+        end
+
+        should "delete the edition from the database and display success message with redirection to root" do
+          delete :destroy, params: { id: @edition.id }
+
+          assert_equal 0, Edition.where(id: @edition.id).count
+          assert_equal "Edition deleted", flash[:success]
+          assert_redirected_to root_path
+        end
+
+        %i[published scheduled_for_publishing archived].each do |edition_state|
+          context "edition with state '#{edition_state}' can not be deleted" do
+            setup do
+              @edition = FactoryBot.create(:edition, state: edition_state, publish_at: Time.zone.now + 1.hour)
+            end
+
+            should "redirect to edition path with error message" do
+              delete :destroy, params: { id: @edition.id }
+
+              assert_redirected_to edition_path
+              assert_equal "Cannot delete a #{description(@edition)} that has ever been published.", flash[:danger]
+            end
+          end
+        end
+
+        should "render confirm destroy page with error if deleting from database fails" do
+          Edition.any_instance.stubs(:destroy!).raises(Mongoid::Errors::MongoidError.new)
+
+          delete :destroy, params: { id: @edition.id }
+
+          assert_template "secondary_nav_tabs/confirm_destroy"
+          assert_equal "Due to a service problem, the edition couldn't be deleted", flash[:danger]
+        end
       end
     end
   end
@@ -330,4 +400,10 @@ class EditionsControllerTest < ActionController::TestCase
       }
     end
   end
+
+private
+
+  def description(edition)
+    edition.format.underscore.humanize.downcase
+  end
 end