app/views/spree/admin/flash_sales/edit.html.erb
<% content_for :page_title do %>
<%= @object.name %>
<% end %>
<% content_for :page_actions do %>
<li>
<%= button_link_to 'Edit', [:edit, :admin, @object], :icon => 'icon-wrench' %>
</li>
<% end %>
<div data-hook="admin_flash_sale_edit_form">
<%= form_for [:admin, @flash_sale], html: { id: 'flash_sale', multipart: true } do |form| %>
<%= render partial: 'form', locals: { form: form } %>
<% end %>
</div>