fohow_admin/lib/rails_admin/builk_export_order.rb

module RailsAdmin
    module Config
        module Actions
            class BuilkExportOrder < RailsAdmin::Config::Actions::Base
                RailsAdmin::Config::Actions.register(self)

                register_instance_option :collection do
                    true
                end

                register_instance_option :http_methods do
                    [:post, :delete]
                end

                register_instance_option :controller do
                    proc do
                        if request.post? # BULK DELETE
                            @objects = list_entries(@model_config, :destroy)

                            if @objects.blank?
                                flash[:error] = t('admin.flash.error', name: pluralize(0, @model_config.label), action: t('admin.actions.delete.done'))
                                redirect_to index_path
                            else
                                render @action.template_name
                            end

                        elsif request.delete? # BULK DESTROY

                            destroyed = nil
                            not_destroyed = nil

                            unless params[:bulk_ids].blank?
                                @objects = list_entries(@model_config, :destroy)
                                unless @objects.blank?
                                    processed_objects = @abstract_model.destroy(@objects)
                                    destroyed = processed_objects.select(&:destroyed?)
                                    not_destroyed = processed_objects - destroyed
                                    destroyed.each do |object|
                                        @auditing_adapter && @auditing_adapter.delete_object(object, @abstract_model, _current_user)
                                    end
                                end
                            end

                            if destroyed.nil?
                                flash[:error] = t('admin.flash.error', name: pluralize(0, @model_config.label), action: t('admin.actions.delete.done'))
                            else
                                flash[:success] = t('admin.flash.successful', name: pluralize(destroyed.count, @model_config.label), action: t('admin.actions.delete.done')) unless destroyed.empty?
                                flash[:error] = t('admin.flash.error', name: pluralize(not_destroyed.count, @model_config.label), action: t('admin.actions.delete.done')) unless not_destroyed.empty?
                            end
                            redirect_to back_or_index
                        end
                    end
                end

                register_instance_option :authorization_key do
                    :destroy
                end

                register_instance_option :bulkable? do
                    true
                end
            end
        end
    end
end