anchor.diff:      db_work_image_detail_path(work),
       class: "nav-link",
       class_active: "active",
  -    active: params[:controller]  == "db/work_images"
  +    active: params[:controller]  == "v4/db/work_images"
     ) %>
   
     <%= active_link_to(
  
positive.code:       db_slot_list_path(work),
        class: "nav-link",
        class_active: "active",
        active: params[:controller]  == "db/slots"
      ) %>
    <% end %>
  
  
negative.code:     db_program_list_path(work),
      class: "nav-link",
      class_active: "active",
      active: params[:controller]  == "v4/db/programs"
    ) %>
  
    <% unless work.no_episodes? %>
  