(bug) show explicit error message when unable to delete a product

app/exceptions/cannot_delete_product_error.rb

@@ -1,3 +1,5 @@
-# Raised when delete a product if this product has used in order
+# frozen_string_literal: true
+
+# Raised when deleting a product, if this product is used in orders
 class CannotDeleteProductError < StandardError
 end

app/services/product_service.rb

@@ -69,7 +69,7 @@ class ProductService
     def destroy(product)
       used_in_order = OrderItem.joins(:order).where.not('orders.state' => 'cart')
                                .exists?(orderable: product)
-      raise CannotDeleteProductError if used_in_order
+      raise CannotDeleteProductError, I18n.t('errors.messages.product_in_use') if used_in_order
 
       ActiveRecord::Base.transaction do
         orders_with_product = Order.joins(:order_items).where(state: 'cart').where('order_items.orderable': product)

config/locales/en.yml

@@ -46,6 +46,7 @@ en:
       gateway_error: "Payement gateway error: %{MESSAGE}"
       gateway_amount_too_small: "Payments under %{AMOUNT} are not supported. Please order directly at the reception."
       gateway_amount_too_large: "Payments above %{AMOUNT} are not supported. Please order directly at the reception."
+      product_in_use: "This product have already been ordered"
   apipie:
     api_documentation: "API Documentation"
     code: "HTTP code"