ruby on rails - 'method not found' after using controller decorator -

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i'm trying add feature spree admin page resend shipment email.

i'm getting error,

actionview::template::error (undefined method `resend_shipment_email_admin_order_url' #<#<class:0x0000000668cf80>:0x00000006683700>):     16:               </ul>     17:                  18:   <%= button_link_to spree.t('resend order email'), resend_admin_order_url(@order), method: :post, icon: 'email' %>     19:   <%= button_link_to spree.t('resend shipment email'), resend_shipment_email_admin_order_url(@order), method: :post, icon: 'email'  %>     20:   </div>     21:           <% end %>     22:         </div>

here decorator, app/controllers/spree/orders_controller_decorator.rb,

spree::admin::orderscontroller.class_eval    before_action :load_order, only: [:edit, :update, :cancel, :resume, :approve, :resend, :resend_shipment_email, :open_adjustments, :close_adjustments, :cart]    def resend_shipment_email     if @order.shipment_state == "shipped"       shipmentmailer.shipped_email(@order.shipments.last.id).deliver       flash[:success] = "shipment email resent"       redirect_to :back     else       flash[:error] = "cannot send shipment email. order not marked shipped."       redirect_to :back     end   end  end

here's routes,

  namespace :admin     resources :orders, except: [:show]       member         post :resend_shipment_email       end     end   end

here's view override,

deface::override.new(:virtual_path => 'spree/admin/shared/_content_header',   :name => 'add_resend_shipment_email_button_to_spree_admin',   :insert_bottom => "[data-hook='toolbar'], #toolbar[data-hook]",   :text => "   <%= button_link_to spree.t('resend order email'), resend_admin_order_url(@order), method: :post, icon: 'email' %>   <%= button_link_to spree.t('resend shipment email'), resend_shipment_email_admin_order_url(@order), method: :post, icon: 'email' %>   " )

here snippet rake routes,

resend_shipment_email_admin_order post   /admin/orders/:id/resend_shipment_email(.:format) admin/orders#resend_shipment_email                                resend_admin_order post     /admin/orders/:id/resend(.:format)                                          spree/admin/orders#resend

what had fix routes file spree recognize,

spree::core::engine.routes.draw     namespace :admin       resources :orders, except: [:show]         member           post :resend_shipment_email         end       end     end   end

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