Add promotion batch default action -

csv_export.

app/helpers/spree/admin/navigation_helper.rb

@@ -377,6 +377,10 @@ def variants_actions
       def product_properties_actions
         Rails.application.config.spree_backend.actions[:product_properties]
       end
+
+      def promotion_batch_actions
+        Rails.application.config.spree_backend.actions[:promotion_batch_actions]
+      end
       # rubocop:enable Metrics/ModuleLength
     end
   end

app/models/spree/admin/actions/promotion_batch_default_actions_builder.rb

@@ -0,0 +1,27 @@
+module Spree
+  module Admin
+    module Actions
+      class PromotionBatchDefaultActionsBuilder
+        include Spree::Core::Engine.routes.url_helpers
+
+        def build
+          root = Root.new
+          export_codes_to_csv_action(root)
+          root
+        end
+
+        private
+
+        def export_codes_to_csv_action(root)
+          action =
+            ActionBuilder.new('csv_export', ->(resource) { csv_export_admin_promotion_batch_path(resource) }).
+            with_icon_key('download.svg').
+            with_style(::Spree::Admin::Actions::ActionStyle::PRIMARY).
+            build
+
+          root.add(action)
+        end
+      end
+    end
+  end
+end

app/views/spree/admin/promotion_batches/show.html.erb

@@ -1,3 +1,15 @@
 <% content_for :page_title do %>
   <%= Spree.t(:promotion_batch) %>
-<% end %>
+<% end %>
+
+<% content_for :page_actions do %>
+  <% promotion_batch_actions.items.each do |action| %>
+    <% next unless action.available?(current_ability) %>
+    <%= button_link_to(
+      Spree.t(action.label_translation_key),
+      action.url(@promotion_batch),
+      class: action.classes,
+      icon: action.icon_key
+    ) %>
+  <% end %>
+<% end %>

config/routes.rb

@@ -11,7 +11,11 @@
 
     resources :promotion_categories, except: [:show]
 
-    resources :promotion_batches
+    resources :promotion_batches do
+      member do
+        get :csv_export
+      end
+    end
 
     resources :zones
 

lib/spree/backend/engine.rb

@@ -46,6 +46,7 @@ class Engine < ::Rails::Engine
         Rails.application.config.spree_backend.actions[:payments] = Spree::Admin::Actions::PaymentsDefaultActionsBuilder.new.build
         Rails.application.config.spree_backend.actions[:variants] = Spree::Admin::Actions::VariantsDefaultActionsBuilder.new.build
         Rails.application.config.spree_backend.actions[:product_properties] = Spree::Admin::Actions::ProductPropertiesDefaultActionsBuilder.new.build
+        Rails.application.config.spree_backend.actions[:promotion_batch_actions] = Spree::Admin::Actions::PromotionBatchDefaultActionsBuilder.new.build
       end
     end
   end