Controls: Add ability to delete controls

- Add `ControlsController#destroy` and translations

app/controllers/controls_controller.rb

@@ -1,5 +1,5 @@
 class ControlsController < ApplicationController
-  before_action :set_control, only: %i[show edit update]
+  before_action :set_control, only: %i[show edit update destroy]
 
   def index
     @controls = Control.order(:display_name)
@@ -33,6 +33,14 @@ def update
     end
   end
 
+  def destroy
+    if @control.destroy
+      redirect_to controls_path, notice: t(".success")
+    else
+      redirect_to @control, alert: t(".failure")
+    end
+  end
+
 private
 
   def set_control

app/views/controls/show.html.erb

@@ -23,6 +23,11 @@
     href: edit_control_path(@control),
     inline_layout: true
   } %>
+  <%= delete_button(
+    t("common.buttons.delete", model_name: t_model_name),
+    @control,
+    is_inline: true
+  ) %>
 </div>
 
 <%= render "govuk_publishing_components/components/summary_list", {

config/locales/en.yml

@@ -114,6 +114,9 @@ en:
       success: The control was successfully created.
     update:
       success: The control was successfully updated.
+    destroy:
+      success: The control was successfully deleted.
+      failure: The control could not be deleted.
 
   recommended_links:
     index:

spec/system/controls_spec.rb

@@ -20,6 +20,9 @@
 
     then_the_control_has_been_updated
     and_i_can_see_the_updated_boost_control_details
+
+    when_i_choose_to_delete_the_control
+    then_the_control_has_been_deleted
   end
 
   scenario "Managing filter controls" do
@@ -35,6 +38,9 @@
 
     then_the_control_has_been_updated
     and_i_can_see_the_updated_filter_control_details
+
+    when_i_choose_to_delete_the_control
+    then_the_control_has_been_deleted
   end
 
   def given_several_controls_exist
@@ -131,4 +137,13 @@ def and_i_can_see_the_updated_filter_control_details
     expect(page).to have_content("Name My updated filter control")
     expect(page).to have_content("Filter expression is_really_cool = 999")
   end
+
+  def when_i_choose_to_delete_the_control
+    click_button "Delete control"
+  end
+
+  def then_the_control_has_been_deleted
+    expect(page).to have_content("control was successfully deleted")
+    expect(Control.count).to eq(0)
+  end
 end