Add ability to delete an existing control

app/controllers/controls_controller.rb

@@ -33,6 +33,16 @@ def update
     end
   end
 
+  def destroy
+    @control = Control.find(params[:id])
+
+    if @control.destroy
+      redirect_to controls_path, notice: "Control deleted successfully"
+    else
+      redirect_to @control, alert: "Control could not be deleted. Try again later."
+    end
+  end
+
 private
 
   def control_params

app/views/controls/show.html.erb

@@ -18,4 +18,5 @@
     href: edit_control_path(@control),
     inline_layout: true
   } %>
+  <%= delete_button "Delete control", control_path(@control), is_inline: true %>
 </div>

spec/system/controls_spec.rb

@@ -55,6 +55,16 @@
     and_i_can_see_what_errors_i_need_to_fix
   end
 
+  scenario "Deleting an existing control" do
+    given_a_control
+
+    when_i_go_to_view_the_control
+    and_i_choose_to_delete_it
+
+    then_the_control_has_been_deleted_locally
+    and_i_am_notified_of_the_deletion
+  end
+
   def given_several_controls
     @control1 = create(:control, display_name: "Control 1")
     @control2 = create(:control, display_name: "Control 2")
@@ -97,6 +107,10 @@ def and_i_submit_the_form_with_updated_details
     click_on "Save"
   end
 
+  def and_i_choose_to_delete_it
+    click_on "Delete"
+  end
+
   def then_the_control_has_not_been_created
     expect(Control.count).to eq(0)
   end
@@ -133,4 +147,12 @@ def and_i_can_see_the_new_details
   def then_the_control_has_not_been_updated
     expect(@control.reload.display_name).to eq("Control")
   end
+
+  def then_the_control_has_been_deleted_locally
+    expect(Control.count).to eq(0)
+  end
+
+  def and_i_am_notified_of_the_deletion
+    expect(page).to have_content("Control deleted successfully")
+  end
 end